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/* |
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* security/ccsecurity/policy_io.c |
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* |
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* Copyright (C) 2005-2011 NTT DATA CORPORATION |
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* |
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* Version: 1.8.2-pre 2011/06/01 |
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*/ |
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|
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#include "internal.h" |
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|
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) |
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|
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/** |
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* __wait_event_interruptible_timeout - Sleep until a condition gets true or a timeout elapses. |
15 |
* |
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* @wq: The waitqueue to wait on. |
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* @condition: A C expression for the event to wait for. |
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* @ret: Timeout, in jiffies. |
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* |
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* Returns 0 if the @timeout elapsed, -ERESTARTSYS if it was interrupted by a |
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* signal, and the remaining jiffies otherwise if the condition evaluated to |
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* true before the timeout elapsed. |
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* |
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* This is for compatibility with older kernels. |
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*/ |
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#define __wait_event_interruptible_timeout(wq, condition, ret) \ |
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do { \ |
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wait_queue_t __wait; \ |
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init_waitqueue_entry(&__wait, current); \ |
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\ |
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add_wait_queue(&wq, &__wait); \ |
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for (;;) { \ |
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set_current_state(TASK_INTERRUPTIBLE); \ |
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if (condition) \ |
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break; \ |
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if (!signal_pending(current)) { \ |
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ret = schedule_timeout(ret); \ |
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if (!ret) \ |
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break; \ |
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continue; \ |
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} \ |
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ret = -ERESTARTSYS; \ |
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break; \ |
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} \ |
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current->state = TASK_RUNNING; \ |
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remove_wait_queue(&wq, &__wait); \ |
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} while (0) |
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|
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/** |
50 |
* wait_event_interruptible_timeout - Sleep until a condition gets true or a timeout elapses. |
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* |
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* @wq: The waitqueue to wait on. |
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* @condition: A C expression for the event to wait for. |
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* @timeout: Timeout, in jiffies. |
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* |
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* Returns 0 if the @timeout elapsed, -ERESTARTSYS if it was interrupted by a |
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* signal, and the remaining jiffies otherwise if the condition evaluated to |
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* true before the timeout elapsed. |
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* |
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* This is for compatibility with older kernels. |
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*/ |
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#define wait_event_interruptible_timeout(wq, condition, timeout) \ |
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({ \ |
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long __ret = timeout; \ |
65 |
if (!(condition)) \ |
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__wait_event_interruptible_timeout(wq, condition, __ret); \ |
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__ret; \ |
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}) |
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|
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#endif |
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|
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/** |
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* list_for_each_cookie - iterate over a list with cookie. |
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* |
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* @pos: Pointer to "struct list_head". |
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* @head: Pointer to "struct list_head". |
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*/ |
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#define list_for_each_cookie(pos, head) \ |
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for (pos = pos ? pos : srcu_dereference((head)->next, &ccs_ss); \ |
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pos != (head); pos = srcu_dereference(pos->next, &ccs_ss)) |
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|
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/* String table for operation mode. */ |
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const char * const ccs_mode[CCS_CONFIG_MAX_MODE] = { |
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[CCS_CONFIG_DISABLED] = "disabled", |
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[CCS_CONFIG_LEARNING] = "learning", |
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[CCS_CONFIG_PERMISSIVE] = "permissive", |
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[CCS_CONFIG_ENFORCING] = "enforcing" |
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}; |
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|
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/* String table for /proc/ccs/profile interface. */ |
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const char * const ccs_mac_keywords[CCS_MAX_MAC_INDEX |
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+ CCS_MAX_MAC_CATEGORY_INDEX] = { |
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/* CONFIG::file group */ |
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[CCS_MAC_FILE_EXECUTE] = "execute", |
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[CCS_MAC_FILE_OPEN] = "open", |
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[CCS_MAC_FILE_CREATE] = "create", |
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[CCS_MAC_FILE_UNLINK] = "unlink", |
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[CCS_MAC_FILE_GETATTR] = "getattr", |
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[CCS_MAC_FILE_MKDIR] = "mkdir", |
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[CCS_MAC_FILE_RMDIR] = "rmdir", |
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[CCS_MAC_FILE_MKFIFO] = "mkfifo", |
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[CCS_MAC_FILE_MKSOCK] = "mksock", |
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[CCS_MAC_FILE_TRUNCATE] = "truncate", |
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[CCS_MAC_FILE_SYMLINK] = "symlink", |
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[CCS_MAC_FILE_MKBLOCK] = "mkblock", |
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[CCS_MAC_FILE_MKCHAR] = "mkchar", |
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[CCS_MAC_FILE_LINK] = "link", |
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[CCS_MAC_FILE_RENAME] = "rename", |
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[CCS_MAC_FILE_CHMOD] = "chmod", |
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[CCS_MAC_FILE_CHOWN] = "chown", |
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[CCS_MAC_FILE_CHGRP] = "chgrp", |
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[CCS_MAC_FILE_IOCTL] = "ioctl", |
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[CCS_MAC_FILE_CHROOT] = "chroot", |
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[CCS_MAC_FILE_MOUNT] = "mount", |
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[CCS_MAC_FILE_UMOUNT] = "unmount", |
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[CCS_MAC_FILE_PIVOT_ROOT] = "pivot_root", |
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/* CONFIG::misc group */ |
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[CCS_MAC_ENVIRON] = "env", |
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/* CONFIG::network group */ |
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[CCS_MAC_NETWORK_INET_STREAM_BIND] = "inet_stream_bind", |
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[CCS_MAC_NETWORK_INET_STREAM_LISTEN] = "inet_stream_listen", |
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[CCS_MAC_NETWORK_INET_STREAM_CONNECT] = "inet_stream_connect", |
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[CCS_MAC_NETWORK_INET_STREAM_ACCEPT] = "inet_stream_accept", |
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[CCS_MAC_NETWORK_INET_DGRAM_BIND] = "inet_dgram_bind", |
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[CCS_MAC_NETWORK_INET_DGRAM_SEND] = "inet_dgram_send", |
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[CCS_MAC_NETWORK_INET_DGRAM_RECV] = "inet_dgram_recv", |
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[CCS_MAC_NETWORK_INET_RAW_BIND] = "inet_raw_bind", |
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[CCS_MAC_NETWORK_INET_RAW_SEND] = "inet_raw_send", |
129 |
[CCS_MAC_NETWORK_INET_RAW_RECV] = "inet_raw_recv", |
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[CCS_MAC_NETWORK_UNIX_STREAM_BIND] = "unix_stream_bind", |
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[CCS_MAC_NETWORK_UNIX_STREAM_LISTEN] = "unix_stream_listen", |
132 |
[CCS_MAC_NETWORK_UNIX_STREAM_CONNECT] = "unix_stream_connect", |
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[CCS_MAC_NETWORK_UNIX_STREAM_ACCEPT] = "unix_stream_accept", |
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[CCS_MAC_NETWORK_UNIX_DGRAM_BIND] = "unix_dgram_bind", |
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[CCS_MAC_NETWORK_UNIX_DGRAM_SEND] = "unix_dgram_send", |
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[CCS_MAC_NETWORK_UNIX_DGRAM_RECV] = "unix_dgram_recv", |
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[CCS_MAC_NETWORK_UNIX_SEQPACKET_BIND] = "unix_seqpacket_bind", |
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[CCS_MAC_NETWORK_UNIX_SEQPACKET_LISTEN] = "unix_seqpacket_listen", |
139 |
[CCS_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect", |
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[CCS_MAC_NETWORK_UNIX_SEQPACKET_ACCEPT] = "unix_seqpacket_accept", |
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/* CONFIG::ipc group */ |
142 |
[CCS_MAC_SIGNAL] = "signal", |
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/* CONFIG::capability group */ |
144 |
[CCS_MAC_CAPABILITY_USE_ROUTE_SOCKET] = "use_route", |
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[CCS_MAC_CAPABILITY_USE_PACKET_SOCKET] = "use_packet", |
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[CCS_MAC_CAPABILITY_SYS_REBOOT] = "SYS_REBOOT", |
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[CCS_MAC_CAPABILITY_SYS_VHANGUP] = "SYS_VHANGUP", |
148 |
[CCS_MAC_CAPABILITY_SYS_SETTIME] = "SYS_TIME", |
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[CCS_MAC_CAPABILITY_SYS_NICE] = "SYS_NICE", |
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[CCS_MAC_CAPABILITY_SYS_SETHOSTNAME] = "SYS_SETHOSTNAME", |
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[CCS_MAC_CAPABILITY_USE_KERNEL_MODULE] = "use_kernel_module", |
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[CCS_MAC_CAPABILITY_SYS_KEXEC_LOAD] = "SYS_KEXEC_LOAD", |
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[CCS_MAC_CAPABILITY_SYS_PTRACE] = "SYS_PTRACE", |
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/* CONFIG group */ |
155 |
[CCS_MAX_MAC_INDEX + CCS_MAC_CATEGORY_FILE] = "file", |
156 |
[CCS_MAX_MAC_INDEX + CCS_MAC_CATEGORY_NETWORK] = "network", |
157 |
[CCS_MAX_MAC_INDEX + CCS_MAC_CATEGORY_MISC] = "misc", |
158 |
[CCS_MAX_MAC_INDEX + CCS_MAC_CATEGORY_IPC] = "ipc", |
159 |
[CCS_MAX_MAC_INDEX + CCS_MAC_CATEGORY_CAPABILITY] = "capability", |
160 |
}; |
161 |
|
162 |
/* String table for path operation. */ |
163 |
const char * const ccs_path_keyword[CCS_MAX_PATH_OPERATION] = { |
164 |
[CCS_TYPE_EXECUTE] = "execute", |
165 |
[CCS_TYPE_READ] = "read", |
166 |
[CCS_TYPE_WRITE] = "write", |
167 |
[CCS_TYPE_APPEND] = "append", |
168 |
[CCS_TYPE_UNLINK] = "unlink", |
169 |
[CCS_TYPE_GETATTR] = "getattr", |
170 |
[CCS_TYPE_RMDIR] = "rmdir", |
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[CCS_TYPE_TRUNCATE] = "truncate", |
172 |
[CCS_TYPE_SYMLINK] = "symlink", |
173 |
[CCS_TYPE_CHROOT] = "chroot", |
174 |
[CCS_TYPE_UMOUNT] = "unmount", |
175 |
}; |
176 |
|
177 |
/* String table for categories. */ |
178 |
static const char * const ccs_category_keywords[CCS_MAX_MAC_CATEGORY_INDEX] = { |
179 |
[CCS_MAC_CATEGORY_FILE] = "file", |
180 |
[CCS_MAC_CATEGORY_NETWORK] = "network", |
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[CCS_MAC_CATEGORY_MISC] = "misc", |
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[CCS_MAC_CATEGORY_IPC] = "ipc", |
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[CCS_MAC_CATEGORY_CAPABILITY] = "capability", |
184 |
}; |
185 |
|
186 |
/* String table for conditions. */ |
187 |
const char * const ccs_condition_keyword[CCS_MAX_CONDITION_KEYWORD] = { |
188 |
[CCS_TASK_UID] = "task.uid", |
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[CCS_TASK_EUID] = "task.euid", |
190 |
[CCS_TASK_SUID] = "task.suid", |
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[CCS_TASK_FSUID] = "task.fsuid", |
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[CCS_TASK_GID] = "task.gid", |
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[CCS_TASK_EGID] = "task.egid", |
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[CCS_TASK_SGID] = "task.sgid", |
195 |
[CCS_TASK_FSGID] = "task.fsgid", |
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[CCS_TASK_PID] = "task.pid", |
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[CCS_TASK_PPID] = "task.ppid", |
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[CCS_EXEC_ARGC] = "exec.argc", |
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[CCS_EXEC_ENVC] = "exec.envc", |
200 |
[CCS_TYPE_IS_SOCKET] = "socket", |
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[CCS_TYPE_IS_SYMLINK] = "symlink", |
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[CCS_TYPE_IS_FILE] = "file", |
203 |
[CCS_TYPE_IS_BLOCK_DEV] = "block", |
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[CCS_TYPE_IS_DIRECTORY] = "directory", |
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[CCS_TYPE_IS_CHAR_DEV] = "char", |
206 |
[CCS_TYPE_IS_FIFO] = "fifo", |
207 |
[CCS_MODE_SETUID] = "setuid", |
208 |
[CCS_MODE_SETGID] = "setgid", |
209 |
[CCS_MODE_STICKY] = "sticky", |
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[CCS_MODE_OWNER_READ] = "owner_read", |
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[CCS_MODE_OWNER_WRITE] = "owner_write", |
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[CCS_MODE_OWNER_EXECUTE] = "owner_execute", |
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[CCS_MODE_GROUP_READ] = "group_read", |
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[CCS_MODE_GROUP_WRITE] = "group_write", |
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[CCS_MODE_GROUP_EXECUTE] = "group_execute", |
216 |
[CCS_MODE_OTHERS_READ] = "others_read", |
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[CCS_MODE_OTHERS_WRITE] = "others_write", |
218 |
[CCS_MODE_OTHERS_EXECUTE] = "others_execute", |
219 |
[CCS_TASK_TYPE] = "task.type", |
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[CCS_TASK_EXECUTE_HANDLER] = "execute_handler", |
221 |
[CCS_EXEC_REALPATH] = "exec.realpath", |
222 |
[CCS_SYMLINK_TARGET] = "symlink.target", |
223 |
[CCS_PATH1_UID] = "path1.uid", |
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[CCS_PATH1_GID] = "path1.gid", |
225 |
[CCS_PATH1_INO] = "path1.ino", |
226 |
[CCS_PATH1_MAJOR] = "path1.major", |
227 |
[CCS_PATH1_MINOR] = "path1.minor", |
228 |
[CCS_PATH1_PERM] = "path1.perm", |
229 |
[CCS_PATH1_TYPE] = "path1.type", |
230 |
[CCS_PATH1_DEV_MAJOR] = "path1.dev_major", |
231 |
[CCS_PATH1_DEV_MINOR] = "path1.dev_minor", |
232 |
[CCS_PATH2_UID] = "path2.uid", |
233 |
[CCS_PATH2_GID] = "path2.gid", |
234 |
[CCS_PATH2_INO] = "path2.ino", |
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[CCS_PATH2_MAJOR] = "path2.major", |
236 |
[CCS_PATH2_MINOR] = "path2.minor", |
237 |
[CCS_PATH2_PERM] = "path2.perm", |
238 |
[CCS_PATH2_TYPE] = "path2.type", |
239 |
[CCS_PATH2_DEV_MAJOR] = "path2.dev_major", |
240 |
[CCS_PATH2_DEV_MINOR] = "path2.dev_minor", |
241 |
[CCS_PATH1_PARENT_UID] = "path1.parent.uid", |
242 |
[CCS_PATH1_PARENT_GID] = "path1.parent.gid", |
243 |
[CCS_PATH1_PARENT_INO] = "path1.parent.ino", |
244 |
[CCS_PATH1_PARENT_PERM] = "path1.parent.perm", |
245 |
[CCS_PATH2_PARENT_UID] = "path2.parent.uid", |
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[CCS_PATH2_PARENT_GID] = "path2.parent.gid", |
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[CCS_PATH2_PARENT_INO] = "path2.parent.ino", |
248 |
[CCS_PATH2_PARENT_PERM] = "path2.parent.perm", |
249 |
}; |
250 |
|
251 |
/* String table for PREFERENCE keyword. */ |
252 |
static const char * const ccs_pref_keywords[CCS_MAX_PREF] = { |
253 |
[CCS_PREF_MAX_AUDIT_LOG] = "max_audit_log", |
254 |
[CCS_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry", |
255 |
[CCS_PREF_ENFORCING_PENALTY] = "enforcing_penalty", |
256 |
}; |
257 |
|
258 |
/* Permit policy management by non-root user? */ |
259 |
static bool ccs_manage_by_non_root; |
260 |
|
261 |
/** |
262 |
* ccs_yesno - Return "yes" or "no". |
263 |
* |
264 |
* @value: Bool value. |
265 |
* |
266 |
* Returns "yes" if @value is not 0, "no" otherwise. |
267 |
*/ |
268 |
const char *ccs_yesno(const unsigned int value) |
269 |
{ |
270 |
return value ? "yes" : "no"; |
271 |
} |
272 |
|
273 |
/* Prototype for ccs_addprintf(). */ |
274 |
static void ccs_addprintf(char *buffer, int len, const char *fmt, ...) |
275 |
__attribute__ ((format(printf, 3, 4))); |
276 |
|
277 |
/** |
278 |
* ccs_addprintf - strncat()-like-snprintf(). |
279 |
* |
280 |
* @buffer: Buffer to write to. Must be '\0'-terminated. |
281 |
* @len: Size of @buffer. |
282 |
* @fmt: The printf()'s format string, followed by parameters. |
283 |
* |
284 |
* Returns nothing. |
285 |
*/ |
286 |
static void ccs_addprintf(char *buffer, int len, const char *fmt, ...) |
287 |
{ |
288 |
va_list args; |
289 |
const int pos = strlen(buffer); |
290 |
va_start(args, fmt); |
291 |
vsnprintf(buffer + pos, len - pos - 1, fmt, args); |
292 |
va_end(args); |
293 |
} |
294 |
|
295 |
/** |
296 |
* ccs_flush - Flush queued string to userspace's buffer. |
297 |
* |
298 |
* @head: Pointer to "struct ccs_io_buffer". |
299 |
* |
300 |
* Returns true if all data was flushed, false otherwise. |
301 |
*/ |
302 |
static bool ccs_flush(struct ccs_io_buffer *head) |
303 |
{ |
304 |
while (head->r.w_pos) { |
305 |
const char *w = head->r.w[0]; |
306 |
size_t len = strlen(w); |
307 |
if (len) { |
308 |
if (len > head->read_user_buf_avail) |
309 |
len = head->read_user_buf_avail; |
310 |
if (!len) |
311 |
return false; |
312 |
if (copy_to_user(head->read_user_buf, w, len)) |
313 |
return false; |
314 |
head->read_user_buf_avail -= len; |
315 |
head->read_user_buf += len; |
316 |
w += len; |
317 |
} |
318 |
head->r.w[0] = w; |
319 |
if (*w) |
320 |
return false; |
321 |
/* Add '\0' for audit logs and query. */ |
322 |
if (head->poll) { |
323 |
if (!head->read_user_buf_avail || |
324 |
copy_to_user(head->read_user_buf, "", 1)) |
325 |
return false; |
326 |
head->read_user_buf_avail--; |
327 |
head->read_user_buf++; |
328 |
} |
329 |
head->r.w_pos--; |
330 |
for (len = 0; len < head->r.w_pos; len++) |
331 |
head->r.w[len] = head->r.w[len + 1]; |
332 |
} |
333 |
head->r.avail = 0; |
334 |
return true; |
335 |
} |
336 |
|
337 |
/** |
338 |
* ccs_set_string - Queue string to "struct ccs_io_buffer" structure. |
339 |
* |
340 |
* @head: Pointer to "struct ccs_io_buffer". |
341 |
* @string: String to print. |
342 |
* |
343 |
* Returns nothing. |
344 |
* |
345 |
* Note that @string has to be kept valid until @head is kfree()d. |
346 |
* This means that char[] allocated on stack memory cannot be passed to |
347 |
* this function. Use ccs_io_printf() for char[] allocated on stack memory. |
348 |
*/ |
349 |
static void ccs_set_string(struct ccs_io_buffer *head, const char *string) |
350 |
{ |
351 |
if (head->r.w_pos < CCS_MAX_IO_READ_QUEUE) { |
352 |
head->r.w[head->r.w_pos++] = string; |
353 |
ccs_flush(head); |
354 |
} else |
355 |
printk(KERN_WARNING "Too many words in a line.\n"); |
356 |
} |
357 |
|
358 |
/* Prototype for ccs_io_printf(). */ |
359 |
static void ccs_io_printf(struct ccs_io_buffer *head, const char *fmt, ...) |
360 |
__attribute__ ((format(printf, 2, 3))); |
361 |
|
362 |
/** |
363 |
* ccs_io_printf - printf() to "struct ccs_io_buffer" structure. |
364 |
* |
365 |
* @head: Pointer to "struct ccs_io_buffer". |
366 |
* @fmt: The printf()'s format string, followed by parameters. |
367 |
* |
368 |
* Returns nothing. |
369 |
*/ |
370 |
static void ccs_io_printf(struct ccs_io_buffer *head, const char *fmt, ...) |
371 |
{ |
372 |
va_list args; |
373 |
size_t len; |
374 |
size_t pos = head->r.avail; |
375 |
int size = head->readbuf_size - pos; |
376 |
if (size <= 0) |
377 |
return; |
378 |
va_start(args, fmt); |
379 |
len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1; |
380 |
va_end(args); |
381 |
if (pos + len >= head->readbuf_size) { |
382 |
printk(KERN_WARNING "Too many words in a line.\n"); |
383 |
return; |
384 |
} |
385 |
head->r.avail += len; |
386 |
ccs_set_string(head, head->read_buf + pos); |
387 |
} |
388 |
|
389 |
/** |
390 |
* ccs_set_space - Put a space to "struct ccs_io_buffer" structure. |
391 |
* |
392 |
* @head: Pointer to "struct ccs_io_buffer". |
393 |
* |
394 |
* Returns nothing. |
395 |
*/ |
396 |
static void ccs_set_space(struct ccs_io_buffer *head) |
397 |
{ |
398 |
ccs_set_string(head, " "); |
399 |
} |
400 |
|
401 |
/** |
402 |
* ccs_set_lf - Put a line feed to "struct ccs_io_buffer" structure. |
403 |
* |
404 |
* @head: Pointer to "struct ccs_io_buffer". |
405 |
* |
406 |
* Returns nothing. |
407 |
*/ |
408 |
static bool ccs_set_lf(struct ccs_io_buffer *head) |
409 |
{ |
410 |
ccs_set_string(head, "\n"); |
411 |
return !head->r.w_pos; |
412 |
} |
413 |
|
414 |
/** |
415 |
* ccs_set_slash - Put a shash to "struct ccs_io_buffer" structure. |
416 |
* |
417 |
* @head: Pointer to "struct ccs_io_buffer". |
418 |
* |
419 |
* Returns nothing. |
420 |
*/ |
421 |
static void ccs_set_slash(struct ccs_io_buffer *head) |
422 |
{ |
423 |
ccs_set_string(head, "/"); |
424 |
} |
425 |
|
426 |
/* List of namespaces. */ |
427 |
LIST_HEAD(ccs_namespace_list); |
428 |
/* True if namespace other than ccs_kernel_namespace is defined. */ |
429 |
static bool ccs_namespace_enabled; |
430 |
|
431 |
/** |
432 |
* ccs_init_policy_namespace - Initialize namespace. |
433 |
* |
434 |
* @ns: Pointer to "struct ccs_policy_namespace". |
435 |
* |
436 |
* Returns nothing. |
437 |
*/ |
438 |
void ccs_init_policy_namespace(struct ccs_policy_namespace *ns) |
439 |
{ |
440 |
unsigned int idx; |
441 |
for (idx = 0; idx < CCS_MAX_ACL_GROUPS; idx++) { |
442 |
INIT_LIST_HEAD(&ns->acl_group[idx][0]); |
443 |
INIT_LIST_HEAD(&ns->acl_group[idx][1]); |
444 |
} |
445 |
for (idx = 0; idx < CCS_MAX_GROUP; idx++) |
446 |
INIT_LIST_HEAD(&ns->group_list[idx]); |
447 |
for (idx = 0; idx < CCS_MAX_POLICY; idx++) |
448 |
INIT_LIST_HEAD(&ns->policy_list[idx]); |
449 |
ns->profile_version = 20100903; |
450 |
ccs_namespace_enabled = !list_empty(&ccs_namespace_list); |
451 |
list_add_tail_rcu(&ns->namespace_list, &ccs_namespace_list); |
452 |
} |
453 |
|
454 |
/** |
455 |
* ccs_print_namespace - Print namespace header. |
456 |
* |
457 |
* @head: Pointer to "struct ccs_io_buffer". |
458 |
* |
459 |
* Returns nothing. |
460 |
*/ |
461 |
static void ccs_print_namespace(struct ccs_io_buffer *head) |
462 |
{ |
463 |
if (!ccs_namespace_enabled) |
464 |
return; |
465 |
ccs_set_string(head, |
466 |
container_of(head->r.ns, struct ccs_policy_namespace, |
467 |
namespace_list)->name); |
468 |
ccs_set_space(head); |
469 |
} |
470 |
|
471 |
/** |
472 |
* ccs_assign_profile - Create a new profile. |
473 |
* |
474 |
* @ns: Pointer to "struct ccs_policy_namespace". |
475 |
* @profile: Profile number to create. |
476 |
* |
477 |
* Returns pointer to "struct ccs_profile" on success, NULL otherwise. |
478 |
*/ |
479 |
static struct ccs_profile *ccs_assign_profile(struct ccs_policy_namespace *ns, |
480 |
const unsigned int profile) |
481 |
{ |
482 |
struct ccs_profile *ptr; |
483 |
struct ccs_profile *entry; |
484 |
if (profile >= CCS_MAX_PROFILES) |
485 |
return NULL; |
486 |
ptr = ns->profile_ptr[profile]; |
487 |
if (ptr) |
488 |
return ptr; |
489 |
entry = kzalloc(sizeof(*entry), CCS_GFP_FLAGS); |
490 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
491 |
goto out; |
492 |
ptr = ns->profile_ptr[profile]; |
493 |
if (!ptr && ccs_memory_ok(entry, sizeof(*entry))) { |
494 |
ptr = entry; |
495 |
ptr->default_config = CCS_CONFIG_DISABLED | |
496 |
CCS_CONFIG_WANT_GRANT_LOG | CCS_CONFIG_WANT_REJECT_LOG; |
497 |
memset(ptr->config, CCS_CONFIG_USE_DEFAULT, |
498 |
sizeof(ptr->config)); |
499 |
ptr->pref[CCS_PREF_MAX_AUDIT_LOG] = |
500 |
CONFIG_CCSECURITY_MAX_AUDIT_LOG; |
501 |
ptr->pref[CCS_PREF_MAX_LEARNING_ENTRY] = |
502 |
CONFIG_CCSECURITY_MAX_ACCEPT_ENTRY; |
503 |
mb(); /* Avoid out-of-order execution. */ |
504 |
ns->profile_ptr[profile] = ptr; |
505 |
entry = NULL; |
506 |
} |
507 |
mutex_unlock(&ccs_policy_lock); |
508 |
out: |
509 |
kfree(entry); |
510 |
return ptr; |
511 |
} |
512 |
|
513 |
/** |
514 |
* ccs_check_profile - Check all profiles currently assigned to domains are defined. |
515 |
* |
516 |
* Returns nothing. |
517 |
*/ |
518 |
static void ccs_check_profile(void) |
519 |
{ |
520 |
struct ccs_domain_info *domain; |
521 |
const int idx = ccs_read_lock(); |
522 |
ccs_policy_loaded = true; |
523 |
printk(KERN_INFO "CCSecurity: 1.8.2-pre 2011/06/01\n"); |
524 |
list_for_each_entry_srcu(domain, &ccs_domain_list, list, &ccs_ss) { |
525 |
const u8 profile = domain->profile; |
526 |
const struct ccs_policy_namespace *ns = domain->ns; |
527 |
if (ns->profile_version != 20100903) |
528 |
printk(KERN_ERR |
529 |
"Profile version %u is not supported.\n", |
530 |
ns->profile_version); |
531 |
else if (!ns->profile_ptr[profile]) |
532 |
printk(KERN_ERR |
533 |
"Profile %u (used by '%s') is not defined.\n", |
534 |
profile, domain->domainname->name); |
535 |
else |
536 |
continue; |
537 |
printk(KERN_ERR |
538 |
"Userland tools for TOMOYO 1.8 must be installed and " |
539 |
"policy must be initialized.\n"); |
540 |
printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/1.8/ " |
541 |
"for more information.\n"); |
542 |
panic("STOP!"); |
543 |
} |
544 |
ccs_read_unlock(idx); |
545 |
printk(KERN_INFO "Mandatory Access Control activated.\n"); |
546 |
} |
547 |
|
548 |
/** |
549 |
* ccs_profile - Find a profile. |
550 |
* |
551 |
* @profile: Profile number to find. |
552 |
* |
553 |
* Returns pointer to "struct ccs_profile". |
554 |
*/ |
555 |
struct ccs_profile *ccs_profile(const u8 profile) |
556 |
{ |
557 |
static struct ccs_profile ccs_null_profile; |
558 |
struct ccs_profile *ptr = ccs_current_namespace()-> |
559 |
profile_ptr[profile]; |
560 |
if (!ptr) |
561 |
ptr = &ccs_null_profile; |
562 |
return ptr; |
563 |
} |
564 |
|
565 |
/** |
566 |
* ccs_find_yesno - Find values for specified keyword. |
567 |
* |
568 |
* @string: String to check. |
569 |
* @find: Name of keyword. |
570 |
* |
571 |
* Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise. |
572 |
*/ |
573 |
static s8 ccs_find_yesno(const char *string, const char *find) |
574 |
{ |
575 |
const char *cp = strstr(string, find); |
576 |
if (cp) { |
577 |
cp += strlen(find); |
578 |
if (!strncmp(cp, "=yes", 4)) |
579 |
return 1; |
580 |
else if (!strncmp(cp, "=no", 3)) |
581 |
return 0; |
582 |
} |
583 |
return -1; |
584 |
} |
585 |
|
586 |
/** |
587 |
* ccs_set_uint - Set value for specified preference. |
588 |
* |
589 |
* @i: Pointer to "unsigned int". |
590 |
* @string: String to check. |
591 |
* @find: Name of keyword. |
592 |
* |
593 |
* Returns nothing. |
594 |
*/ |
595 |
static void ccs_set_uint(unsigned int *i, const char *string, const char *find) |
596 |
{ |
597 |
const char *cp = strstr(string, find); |
598 |
if (cp) |
599 |
sscanf(cp + strlen(find), "=%u", i); |
600 |
} |
601 |
|
602 |
/** |
603 |
* ccs_set_mode - Set mode for specified profile. |
604 |
* |
605 |
* @name: Name of functionality. |
606 |
* @value: Mode for @name. |
607 |
* @profile: Pointer to "struct ccs_profile". |
608 |
* |
609 |
* Returns 0 on success, negative value otherwise. |
610 |
*/ |
611 |
static int ccs_set_mode(char *name, const char *value, |
612 |
struct ccs_profile *profile) |
613 |
{ |
614 |
u8 i; |
615 |
u8 config; |
616 |
if (!strcmp(name, "CONFIG")) { |
617 |
i = CCS_MAX_MAC_INDEX + CCS_MAX_MAC_CATEGORY_INDEX; |
618 |
config = profile->default_config; |
619 |
} else if (ccs_str_starts(&name, "CONFIG::")) { |
620 |
config = 0; |
621 |
for (i = 0; i < CCS_MAX_MAC_INDEX + CCS_MAX_MAC_CATEGORY_INDEX; |
622 |
i++) { |
623 |
int len = 0; |
624 |
if (i < CCS_MAX_MAC_INDEX) { |
625 |
const u8 c = ccs_index2category[i]; |
626 |
const char *category = |
627 |
ccs_category_keywords[c]; |
628 |
len = strlen(category); |
629 |
if (strncmp(name, category, len) || |
630 |
name[len++] != ':' || name[len++] != ':') |
631 |
continue; |
632 |
} |
633 |
if (strcmp(name + len, ccs_mac_keywords[i])) |
634 |
continue; |
635 |
config = profile->config[i]; |
636 |
break; |
637 |
} |
638 |
if (i == CCS_MAX_MAC_INDEX + CCS_MAX_MAC_CATEGORY_INDEX) |
639 |
return -EINVAL; |
640 |
} else { |
641 |
return -EINVAL; |
642 |
} |
643 |
if (strstr(value, "use_default")) { |
644 |
config = CCS_CONFIG_USE_DEFAULT; |
645 |
} else { |
646 |
u8 mode; |
647 |
for (mode = 0; mode < CCS_CONFIG_MAX_MODE; mode++) |
648 |
if (strstr(value, ccs_mode[mode])) |
649 |
/* |
650 |
* Update lower 3 bits in order to distinguish |
651 |
* 'config' from 'CCS_CONFIG_USE_DEAFULT'. |
652 |
*/ |
653 |
config = (config & ~7) | mode; |
654 |
if (config != CCS_CONFIG_USE_DEFAULT) { |
655 |
switch (ccs_find_yesno(value, "grant_log")) { |
656 |
case 1: |
657 |
config |= CCS_CONFIG_WANT_GRANT_LOG; |
658 |
break; |
659 |
case 0: |
660 |
config &= ~CCS_CONFIG_WANT_GRANT_LOG; |
661 |
break; |
662 |
} |
663 |
switch (ccs_find_yesno(value, "reject_log")) { |
664 |
case 1: |
665 |
config |= CCS_CONFIG_WANT_REJECT_LOG; |
666 |
break; |
667 |
case 0: |
668 |
config &= ~CCS_CONFIG_WANT_REJECT_LOG; |
669 |
break; |
670 |
} |
671 |
} |
672 |
} |
673 |
if (i < CCS_MAX_MAC_INDEX + CCS_MAX_MAC_CATEGORY_INDEX) |
674 |
profile->config[i] = config; |
675 |
else if (config != CCS_CONFIG_USE_DEFAULT) |
676 |
profile->default_config = config; |
677 |
return 0; |
678 |
} |
679 |
|
680 |
/** |
681 |
* ccs_write_profile - Write profile table. |
682 |
* |
683 |
* @head: Pointer to "struct ccs_io_buffer". |
684 |
* |
685 |
* Returns 0 on success, negative value otherwise. |
686 |
*/ |
687 |
static int ccs_write_profile(struct ccs_io_buffer *head) |
688 |
{ |
689 |
char *data = head->write_buf; |
690 |
unsigned int i; |
691 |
char *cp; |
692 |
struct ccs_profile *profile; |
693 |
if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version) |
694 |
== 1) |
695 |
return 0; |
696 |
i = simple_strtoul(data, &cp, 10); |
697 |
if (*cp != '-') |
698 |
return -EINVAL; |
699 |
data = cp + 1; |
700 |
profile = ccs_assign_profile(head->w.ns, i); |
701 |
if (!profile) |
702 |
return -EINVAL; |
703 |
cp = strchr(data, '='); |
704 |
if (!cp) |
705 |
return -EINVAL; |
706 |
*cp++ = '\0'; |
707 |
if (!strcmp(data, "COMMENT")) { |
708 |
static DEFINE_SPINLOCK(lock); |
709 |
const struct ccs_path_info *new_comment = ccs_get_name(cp); |
710 |
const struct ccs_path_info *old_comment; |
711 |
if (!new_comment) |
712 |
return -ENOMEM; |
713 |
spin_lock(&lock); |
714 |
old_comment = profile->comment; |
715 |
profile->comment = new_comment; |
716 |
spin_unlock(&lock); |
717 |
ccs_put_name(old_comment); |
718 |
return 0; |
719 |
} |
720 |
if (!strcmp(data, "PREFERENCE")) { |
721 |
for (i = 0; i < CCS_MAX_PREF; i++) |
722 |
ccs_set_uint(&profile->pref[i], cp, |
723 |
ccs_pref_keywords[i]); |
724 |
return 0; |
725 |
} |
726 |
return ccs_set_mode(data, cp, profile); |
727 |
} |
728 |
|
729 |
/** |
730 |
* ccs_print_config - Print mode for specified functionality. |
731 |
* |
732 |
* @head: Pointer to "struct ccs_io_buffer". |
733 |
* @config: Mode for that functionality. |
734 |
* |
735 |
* Returns nothing. |
736 |
* |
737 |
* Caller prints functionality's name. |
738 |
*/ |
739 |
static void ccs_print_config(struct ccs_io_buffer *head, const u8 config) |
740 |
{ |
741 |
ccs_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n", |
742 |
ccs_mode[config & 3], |
743 |
ccs_yesno(config & CCS_CONFIG_WANT_GRANT_LOG), |
744 |
ccs_yesno(config & CCS_CONFIG_WANT_REJECT_LOG)); |
745 |
} |
746 |
|
747 |
/** |
748 |
* ccs_read_profile - Read profile table. |
749 |
* |
750 |
* @head: Pointer to "struct ccs_io_buffer". |
751 |
* |
752 |
* Returns nothing. |
753 |
*/ |
754 |
static void ccs_read_profile(struct ccs_io_buffer *head) |
755 |
{ |
756 |
u8 index; |
757 |
struct ccs_policy_namespace *ns = container_of(head->r.ns, typeof(*ns), |
758 |
namespace_list); |
759 |
const struct ccs_profile *profile; |
760 |
if (head->r.eof) |
761 |
return; |
762 |
next: |
763 |
index = head->r.index; |
764 |
profile = ns->profile_ptr[index]; |
765 |
switch (head->r.step) { |
766 |
case 0: |
767 |
ccs_print_namespace(head); |
768 |
ccs_io_printf(head, "PROFILE_VERSION=%u\n", 20100903); |
769 |
head->r.step++; |
770 |
break; |
771 |
case 1: |
772 |
for ( ; head->r.index < CCS_MAX_PROFILES; head->r.index++) |
773 |
if (ns->profile_ptr[head->r.index]) |
774 |
break; |
775 |
if (head->r.index == CCS_MAX_PROFILES) { |
776 |
head->r.eof = true; |
777 |
return; |
778 |
} |
779 |
head->r.step++; |
780 |
break; |
781 |
case 2: |
782 |
{ |
783 |
u8 i; |
784 |
const struct ccs_path_info *comment = profile->comment; |
785 |
ccs_print_namespace(head); |
786 |
ccs_io_printf(head, "%u-COMMENT=", index); |
787 |
ccs_set_string(head, comment ? comment->name : ""); |
788 |
ccs_set_lf(head); |
789 |
ccs_print_namespace(head); |
790 |
ccs_io_printf(head, "%u-PREFERENCE={ ", index); |
791 |
for (i = 0; i < CCS_MAX_PREF; i++) |
792 |
ccs_io_printf(head, "%s=%u ", |
793 |
ccs_pref_keywords[i], |
794 |
profile->pref[i]); |
795 |
ccs_set_string(head, "}\n"); |
796 |
head->r.step++; |
797 |
} |
798 |
break; |
799 |
case 3: |
800 |
{ |
801 |
ccs_print_namespace(head); |
802 |
ccs_io_printf(head, "%u-%s", index, "CONFIG"); |
803 |
ccs_print_config(head, profile->default_config); |
804 |
head->r.bit = 0; |
805 |
head->r.step++; |
806 |
} |
807 |
break; |
808 |
case 4: |
809 |
for ( ; head->r.bit < CCS_MAX_MAC_INDEX |
810 |
+ CCS_MAX_MAC_CATEGORY_INDEX; head->r.bit++) { |
811 |
const u8 i = head->r.bit; |
812 |
const u8 config = profile->config[i]; |
813 |
if (config == CCS_CONFIG_USE_DEFAULT) |
814 |
continue; |
815 |
ccs_print_namespace(head); |
816 |
if (i < CCS_MAX_MAC_INDEX) |
817 |
ccs_io_printf(head, "%u-CONFIG::%s::%s", index, |
818 |
ccs_category_keywords |
819 |
[ccs_index2category[i]], |
820 |
ccs_mac_keywords[i]); |
821 |
else |
822 |
ccs_io_printf(head, "%u-CONFIG::%s", index, |
823 |
ccs_mac_keywords[i]); |
824 |
ccs_print_config(head, config); |
825 |
head->r.bit++; |
826 |
break; |
827 |
} |
828 |
if (head->r.bit == CCS_MAX_MAC_INDEX |
829 |
+ CCS_MAX_MAC_CATEGORY_INDEX) { |
830 |
head->r.index++; |
831 |
head->r.step = 1; |
832 |
} |
833 |
break; |
834 |
} |
835 |
if (ccs_flush(head)) |
836 |
goto next; |
837 |
} |
838 |
|
839 |
/** |
840 |
* ccs_same_manager - Check for duplicated "struct ccs_manager" entry. |
841 |
* |
842 |
* @a: Pointer to "struct ccs_acl_head". |
843 |
* @b: Pointer to "struct ccs_acl_head". |
844 |
* |
845 |
* Returns true if @a == @b, false otherwise. |
846 |
*/ |
847 |
static bool ccs_same_manager(const struct ccs_acl_head *a, |
848 |
const struct ccs_acl_head *b) |
849 |
{ |
850 |
return container_of(a, struct ccs_manager, head)->manager |
851 |
== container_of(b, struct ccs_manager, head)->manager; |
852 |
} |
853 |
|
854 |
/** |
855 |
* ccs_update_manager_entry - Add a manager entry. |
856 |
* |
857 |
* @manager: The path to manager or the domainnamme. |
858 |
* @is_delete: True if it is a delete request. |
859 |
* |
860 |
* Returns 0 on success, negative value otherwise. |
861 |
*/ |
862 |
static inline int ccs_update_manager_entry(const char *manager, |
863 |
const bool is_delete) |
864 |
{ |
865 |
struct ccs_manager e = { }; |
866 |
struct ccs_acl_param param = { |
867 |
/* .ns = &ccs_kernel_namespace, */ |
868 |
.is_delete = is_delete, |
869 |
.list = &ccs_kernel_namespace.policy_list[CCS_ID_MANAGER], |
870 |
}; |
871 |
int error = is_delete ? -ENOENT : -ENOMEM; |
872 |
if (ccs_domain_def(manager)) { |
873 |
if (!ccs_correct_domain(manager)) |
874 |
return -EINVAL; |
875 |
e.is_domain = true; |
876 |
} else { |
877 |
if (!ccs_correct_path(manager)) |
878 |
return -EINVAL; |
879 |
} |
880 |
e.manager = ccs_get_name(manager); |
881 |
if (e.manager) { |
882 |
error = ccs_update_policy(&e.head, sizeof(e), ¶m, |
883 |
ccs_same_manager); |
884 |
ccs_put_name(e.manager); |
885 |
} |
886 |
return error; |
887 |
} |
888 |
|
889 |
/** |
890 |
* ccs_write_manager - Write manager policy. |
891 |
* |
892 |
* @head: Pointer to "struct ccs_io_buffer". |
893 |
* |
894 |
* Returns 0 on success, negative value otherwise. |
895 |
*/ |
896 |
static int ccs_write_manager(struct ccs_io_buffer *head) |
897 |
{ |
898 |
const char *data = head->write_buf; |
899 |
if (!strcmp(data, "manage_by_non_root")) { |
900 |
ccs_manage_by_non_root = !head->w.is_delete; |
901 |
return 0; |
902 |
} |
903 |
return ccs_update_manager_entry(data, head->w.is_delete); |
904 |
} |
905 |
|
906 |
/** |
907 |
* ccs_read_manager - Read manager policy. |
908 |
* |
909 |
* @head: Pointer to "struct ccs_io_buffer". |
910 |
* |
911 |
* Returns nothing. |
912 |
* |
913 |
* Caller holds ccs_read_lock(). |
914 |
*/ |
915 |
static void ccs_read_manager(struct ccs_io_buffer *head) |
916 |
{ |
917 |
if (head->r.eof) |
918 |
return; |
919 |
list_for_each_cookie(head->r.acl, &ccs_kernel_namespace. |
920 |
policy_list[CCS_ID_MANAGER]) { |
921 |
struct ccs_manager *ptr = |
922 |
list_entry(head->r.acl, typeof(*ptr), head.list); |
923 |
if (ptr->head.is_deleted) |
924 |
continue; |
925 |
if (!ccs_flush(head)) |
926 |
return; |
927 |
ccs_set_string(head, ptr->manager->name); |
928 |
ccs_set_lf(head); |
929 |
} |
930 |
head->r.eof = true; |
931 |
} |
932 |
|
933 |
/** |
934 |
* ccs_manager - Check whether the current process is a policy manager. |
935 |
* |
936 |
* Returns true if the current process is permitted to modify policy |
937 |
* via /proc/ccs/ interface. |
938 |
* |
939 |
* Caller holds ccs_read_lock(). |
940 |
*/ |
941 |
static bool ccs_manager(void) |
942 |
{ |
943 |
struct ccs_manager *ptr; |
944 |
const char *exe; |
945 |
struct ccs_security *task = ccs_current_security(); |
946 |
const struct ccs_path_info *domainname |
947 |
= ccs_current_domain()->domainname; |
948 |
bool found = false; |
949 |
if (!ccs_policy_loaded) |
950 |
return true; |
951 |
if (task->ccs_flags & CCS_TASK_IS_MANAGER) |
952 |
return true; |
953 |
if (!ccs_manage_by_non_root && (current_uid() || current_euid())) |
954 |
return false; |
955 |
exe = ccs_get_exe(); |
956 |
list_for_each_entry_srcu(ptr, &ccs_kernel_namespace. |
957 |
policy_list[CCS_ID_MANAGER], head.list, |
958 |
&ccs_ss) { |
959 |
if (ptr->head.is_deleted) |
960 |
continue; |
961 |
if (ptr->is_domain) { |
962 |
if (ccs_pathcmp(domainname, ptr->manager)) |
963 |
continue; |
964 |
} else { |
965 |
if (!exe || strcmp(exe, ptr->manager->name)) |
966 |
continue; |
967 |
} |
968 |
/* Set manager flag. */ |
969 |
task->ccs_flags |= CCS_TASK_IS_MANAGER; |
970 |
found = true; |
971 |
break; |
972 |
} |
973 |
if (!found) { /* Reduce error messages. */ |
974 |
static pid_t ccs_last_pid; |
975 |
const pid_t pid = current->pid; |
976 |
if (ccs_last_pid != pid) { |
977 |
printk(KERN_WARNING "%s ( %s ) is not permitted to " |
978 |
"update policies.\n", domainname->name, exe); |
979 |
ccs_last_pid = pid; |
980 |
} |
981 |
} |
982 |
kfree(exe); |
983 |
return found; |
984 |
} |
985 |
|
986 |
/** |
987 |
* ccs_select_domain - Parse select command. |
988 |
* |
989 |
* @head: Pointer to "struct ccs_io_buffer". |
990 |
* @data: String to parse. |
991 |
* |
992 |
* Returns true on success, false otherwise. |
993 |
* |
994 |
* Caller holds ccs_read_lock(). |
995 |
*/ |
996 |
static bool ccs_select_domain(struct ccs_io_buffer *head, const char *data) |
997 |
{ |
998 |
unsigned int pid; |
999 |
struct ccs_domain_info *domain = NULL; |
1000 |
bool global_pid = false; |
1001 |
if (strncmp(data, "select ", 7)) |
1002 |
return false; |
1003 |
data += 7; |
1004 |
if (sscanf(data, "pid=%u", &pid) == 1 || |
1005 |
(global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { |
1006 |
struct task_struct *p; |
1007 |
ccs_tasklist_lock(); |
1008 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) |
1009 |
if (global_pid) |
1010 |
p = ccsecurity_exports.find_task_by_pid_ns(pid, |
1011 |
&init_pid_ns); |
1012 |
else |
1013 |
p = ccsecurity_exports.find_task_by_vpid(pid); |
1014 |
#else |
1015 |
p = find_task_by_pid(pid); |
1016 |
#endif |
1017 |
if (p) |
1018 |
domain = ccs_task_domain(p); |
1019 |
ccs_tasklist_unlock(); |
1020 |
} else if (!strncmp(data, "domain=", 7)) { |
1021 |
if (*(data + 7) == '<') |
1022 |
domain = ccs_find_domain(data + 7); |
1023 |
} else |
1024 |
return false; |
1025 |
head->w.domain = domain; |
1026 |
/* Accessing read_buf is safe because head->io_sem is held. */ |
1027 |
if (!head->read_buf) |
1028 |
return true; /* Do nothing if open(O_WRONLY). */ |
1029 |
memset(&head->r, 0, sizeof(head->r)); |
1030 |
head->r.print_this_domain_only = true; |
1031 |
if (domain) |
1032 |
head->r.domain = &domain->list; |
1033 |
else |
1034 |
head->r.eof = true; |
1035 |
ccs_io_printf(head, "# select %s\n", data); |
1036 |
if (domain && domain->is_deleted) |
1037 |
ccs_set_string(head, "# This is a deleted domain.\n"); |
1038 |
return true; |
1039 |
} |
1040 |
|
1041 |
/** |
1042 |
* ccs_same_handler_acl - Check for duplicated "struct ccs_handler_acl" entry. |
1043 |
* |
1044 |
* @a: Pointer to "struct ccs_acl_info". |
1045 |
* @b: Pointer to "struct ccs_acl_info". |
1046 |
* |
1047 |
* Returns true if @a == @b, false otherwise. |
1048 |
*/ |
1049 |
static bool ccs_same_handler_acl(const struct ccs_acl_info *a, |
1050 |
const struct ccs_acl_info *b) |
1051 |
{ |
1052 |
const struct ccs_handler_acl *p1 = container_of(a, typeof(*p1), head); |
1053 |
const struct ccs_handler_acl *p2 = container_of(b, typeof(*p2), head); |
1054 |
return p1->handler == p2->handler; |
1055 |
} |
1056 |
|
1057 |
/** |
1058 |
* ccs_same_task_acl - Check for duplicated "struct ccs_task_acl" entry. |
1059 |
* |
1060 |
* @a: Pointer to "struct ccs_acl_info". |
1061 |
* @b: Pointer to "struct ccs_acl_info". |
1062 |
* |
1063 |
* Returns true if @a == @b, false otherwise. |
1064 |
*/ |
1065 |
static bool ccs_same_task_acl(const struct ccs_acl_info *a, |
1066 |
const struct ccs_acl_info *b) |
1067 |
{ |
1068 |
const struct ccs_task_acl *p1 = container_of(a, typeof(*p1), head); |
1069 |
const struct ccs_task_acl *p2 = container_of(b, typeof(*p2), head); |
1070 |
return p1->domainname == p2->domainname; |
1071 |
} |
1072 |
|
1073 |
/** |
1074 |
* ccs_write_task - Update task related list. |
1075 |
* |
1076 |
* @param: Pointer to "struct ccs_acl_param". |
1077 |
* |
1078 |
* Returns 0 on success, negative value otherwise. |
1079 |
* |
1080 |
* Caller holds ccs_read_lock(). |
1081 |
*/ |
1082 |
static int ccs_write_task(struct ccs_acl_param *param) |
1083 |
{ |
1084 |
int error; |
1085 |
const bool is_auto = ccs_str_starts(¶m->data, |
1086 |
"auto_domain_transition "); |
1087 |
if (!is_auto && !ccs_str_starts(¶m->data, |
1088 |
"manual_domain_transition ")) { |
1089 |
struct ccs_handler_acl e = { }; |
1090 |
char *handler; |
1091 |
if (ccs_str_starts(¶m->data, "auto_execute_handler ")) |
1092 |
e.head.type = CCS_TYPE_AUTO_EXECUTE_HANDLER; |
1093 |
else if (ccs_str_starts(¶m->data, |
1094 |
"denied_execute_handler ")) |
1095 |
e.head.type = CCS_TYPE_DENIED_EXECUTE_HANDLER; |
1096 |
else |
1097 |
return -EINVAL; |
1098 |
handler = ccs_read_token(param); |
1099 |
if (!ccs_correct_path(handler)) |
1100 |
return -EINVAL; |
1101 |
e.handler = ccs_get_name(handler); |
1102 |
if (!e.handler) |
1103 |
return -ENOMEM; |
1104 |
if (e.handler->is_patterned) |
1105 |
error = -EINVAL; /* No patterns allowed. */ |
1106 |
else |
1107 |
error = ccs_update_domain(&e.head, sizeof(e), param, |
1108 |
ccs_same_handler_acl, NULL); |
1109 |
ccs_put_name(e.handler); |
1110 |
} else { |
1111 |
struct ccs_task_acl e = { |
1112 |
.head.type = is_auto ? |
1113 |
CCS_TYPE_AUTO_TASK_ACL : CCS_TYPE_MANUAL_TASK_ACL, |
1114 |
.domainname = ccs_get_domainname(param), |
1115 |
}; |
1116 |
if (!e.domainname) |
1117 |
error = -EINVAL; |
1118 |
else |
1119 |
error = ccs_update_domain(&e.head, sizeof(e), param, |
1120 |
ccs_same_task_acl, NULL); |
1121 |
ccs_put_name(e.domainname); |
1122 |
} |
1123 |
return error; |
1124 |
} |
1125 |
|
1126 |
/** |
1127 |
* ccs_write_domain2 - Write domain policy. |
1128 |
* |
1129 |
* @ns: Pointer to "struct ccs_policy_namespace". |
1130 |
* @list: Pointer to "struct list_head [2]". |
1131 |
* @data: Policy to be interpreted. |
1132 |
* @is_delete: True if it is a delete request. |
1133 |
* |
1134 |
* Returns 0 on success, negative value otherwise. |
1135 |
* |
1136 |
* Caller holds ccs_read_lock(). |
1137 |
*/ |
1138 |
static int ccs_write_domain2(struct ccs_policy_namespace *ns, |
1139 |
struct list_head list[2], char *data, |
1140 |
const bool is_delete) |
1141 |
{ |
1142 |
struct ccs_acl_param param = { |
1143 |
.ns = ns, |
1144 |
.list = list, |
1145 |
.data = data, |
1146 |
.is_delete = is_delete, |
1147 |
}; |
1148 |
static const struct { |
1149 |
const char *keyword; |
1150 |
int (*write) (struct ccs_acl_param *); |
1151 |
} ccs_callback[7] = { |
1152 |
{ "file ", ccs_write_file }, |
1153 |
{ "network inet ", ccs_write_inet_network }, |
1154 |
{ "network unix ", ccs_write_unix_network }, |
1155 |
{ "misc ", ccs_write_misc }, |
1156 |
{ "capability ", ccs_write_capability }, |
1157 |
{ "ipc signal ", ccs_write_ipc }, |
1158 |
{ "task ", ccs_write_task }, |
1159 |
}; |
1160 |
u8 i; |
1161 |
for (i = 0; i < 7; i++) { |
1162 |
if (!ccs_str_starts(¶m.data, ccs_callback[i].keyword)) |
1163 |
continue; |
1164 |
return ccs_callback[i].write(¶m); |
1165 |
} |
1166 |
return -EINVAL; |
1167 |
} |
1168 |
|
1169 |
/** |
1170 |
* ccs_delete_domain - Delete a domain. |
1171 |
* |
1172 |
* @domainname: The name of domain. |
1173 |
* |
1174 |
* Returns 0. |
1175 |
*/ |
1176 |
static int ccs_delete_domain(char *domainname) |
1177 |
{ |
1178 |
struct ccs_domain_info *domain; |
1179 |
struct ccs_path_info name; |
1180 |
name.name = domainname; |
1181 |
ccs_fill_path_info(&name); |
1182 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
1183 |
return 0; |
1184 |
/* Is there an active domain? */ |
1185 |
list_for_each_entry_srcu(domain, &ccs_domain_list, list, &ccs_ss) { |
1186 |
/* Never delete ccs_kernel_domain. */ |
1187 |
if (domain == &ccs_kernel_domain) |
1188 |
continue; |
1189 |
if (domain->is_deleted || |
1190 |
ccs_pathcmp(domain->domainname, &name)) |
1191 |
continue; |
1192 |
domain->is_deleted = true; |
1193 |
break; |
1194 |
} |
1195 |
mutex_unlock(&ccs_policy_lock); |
1196 |
return 0; |
1197 |
} |
1198 |
|
1199 |
/* String table for domain flags. */ |
1200 |
const char * const ccs_dif[CCS_MAX_DOMAIN_INFO_FLAGS] = { |
1201 |
[CCS_DIF_QUOTA_WARNED] = "quota_exceeded\n", |
1202 |
[CCS_DIF_TRANSITION_FAILED] = "transition_failed\n", |
1203 |
}; |
1204 |
|
1205 |
/** |
1206 |
* ccs_write_domain - Write domain policy. |
1207 |
* |
1208 |
* @head: Pointer to "struct ccs_io_buffer". |
1209 |
* |
1210 |
* Returns 0 on success, negative value otherwise. |
1211 |
* |
1212 |
* Caller holds ccs_read_lock(). |
1213 |
*/ |
1214 |
static int ccs_write_domain(struct ccs_io_buffer *head) |
1215 |
{ |
1216 |
char *data = head->write_buf; |
1217 |
struct ccs_policy_namespace *ns; |
1218 |
struct ccs_domain_info *domain = head->w.domain; |
1219 |
const bool is_delete = head->w.is_delete; |
1220 |
const bool is_select = !is_delete && ccs_str_starts(&data, "select "); |
1221 |
unsigned int profile; |
1222 |
if (*data == '<') { |
1223 |
domain = NULL; |
1224 |
if (is_delete) |
1225 |
ccs_delete_domain(data); |
1226 |
else if (is_select) |
1227 |
domain = ccs_find_domain(data); |
1228 |
else |
1229 |
domain = ccs_assign_domain(data, false); |
1230 |
head->w.domain = domain; |
1231 |
return 0; |
1232 |
} |
1233 |
if (!domain) |
1234 |
return -EINVAL; |
1235 |
ns = domain->ns; |
1236 |
if (sscanf(data, "use_profile %u\n", &profile) == 1 |
1237 |
&& profile < CCS_MAX_PROFILES) { |
1238 |
if (!ccs_policy_loaded || ns->profile_ptr[(u8) profile]) |
1239 |
if (!is_delete) |
1240 |
domain->profile = (u8) profile; |
1241 |
return 0; |
1242 |
} |
1243 |
if (sscanf(data, "use_group %u\n", &profile) == 1 |
1244 |
&& profile < CCS_MAX_ACL_GROUPS) { |
1245 |
if (!is_delete) |
1246 |
domain->group = (u8) profile; |
1247 |
return 0; |
1248 |
} |
1249 |
for (profile = 0; profile < CCS_MAX_DOMAIN_INFO_FLAGS; profile++) { |
1250 |
const char *cp = ccs_dif[profile]; |
1251 |
if (strncmp(data, cp, strlen(cp) - 1)) |
1252 |
continue; |
1253 |
domain->flags[profile] = !is_delete; |
1254 |
return 0; |
1255 |
} |
1256 |
return ccs_write_domain2(ns, domain->acl_info_list, data, is_delete); |
1257 |
} |
1258 |
|
1259 |
/** |
1260 |
* ccs_print_name_union - Print a ccs_name_union. |
1261 |
* |
1262 |
* @head: Pointer to "struct ccs_io_buffer". |
1263 |
* @ptr: Pointer to "struct ccs_name_union". |
1264 |
* |
1265 |
* Returns nothing. |
1266 |
*/ |
1267 |
static void ccs_print_name_union(struct ccs_io_buffer *head, |
1268 |
const struct ccs_name_union *ptr) |
1269 |
{ |
1270 |
ccs_set_space(head); |
1271 |
if (ptr->is_group) { |
1272 |
ccs_set_string(head, "@"); |
1273 |
ccs_set_string(head, ptr->group->group_name->name); |
1274 |
} else { |
1275 |
ccs_set_string(head, ptr->filename->name); |
1276 |
} |
1277 |
} |
1278 |
|
1279 |
/** |
1280 |
* ccs_print_name_union_quoted - Print a ccs_name_union with a quote. |
1281 |
* |
1282 |
* @head: Pointer to "struct ccs_io_buffer". |
1283 |
* @ptr: Pointer to "struct ccs_name_union". |
1284 |
* |
1285 |
* Returns nothing. |
1286 |
*/ |
1287 |
static void ccs_print_name_union_quoted(struct ccs_io_buffer *head, |
1288 |
const struct ccs_name_union *ptr) |
1289 |
{ |
1290 |
if (ptr->is_group) { |
1291 |
ccs_set_string(head, "@"); |
1292 |
ccs_set_string(head, ptr->group->group_name->name); |
1293 |
} else { |
1294 |
ccs_set_string(head, "\""); |
1295 |
ccs_set_string(head, ptr->filename->name); |
1296 |
ccs_set_string(head, "\""); |
1297 |
} |
1298 |
} |
1299 |
|
1300 |
/** |
1301 |
* ccs_print_number_union_nospace - Print a ccs_number_union without a space. |
1302 |
* |
1303 |
* @head: Pointer to "struct ccs_io_buffer". |
1304 |
* @ptr: Pointer to "struct ccs_number_union". |
1305 |
* |
1306 |
* Returns nothing. |
1307 |
*/ |
1308 |
static void ccs_print_number_union_nospace(struct ccs_io_buffer *head, |
1309 |
const struct ccs_number_union *ptr) |
1310 |
{ |
1311 |
if (ptr->is_group) { |
1312 |
ccs_set_string(head, "@"); |
1313 |
ccs_set_string(head, ptr->group->group_name->name); |
1314 |
} else { |
1315 |
int i; |
1316 |
unsigned long min = ptr->values[0]; |
1317 |
const unsigned long max = ptr->values[1]; |
1318 |
u8 min_type = ptr->value_type[0]; |
1319 |
const u8 max_type = ptr->value_type[1]; |
1320 |
char buffer[128]; |
1321 |
buffer[0] = '\0'; |
1322 |
for (i = 0; i < 2; i++) { |
1323 |
switch (min_type) { |
1324 |
case CCS_VALUE_TYPE_HEXADECIMAL: |
1325 |
ccs_addprintf(buffer, sizeof(buffer), "0x%lX", |
1326 |
min); |
1327 |
break; |
1328 |
case CCS_VALUE_TYPE_OCTAL: |
1329 |
ccs_addprintf(buffer, sizeof(buffer), "0%lo", |
1330 |
min); |
1331 |
break; |
1332 |
default: |
1333 |
ccs_addprintf(buffer, sizeof(buffer), "%lu", |
1334 |
min); |
1335 |
break; |
1336 |
} |
1337 |
if (min == max && min_type == max_type) |
1338 |
break; |
1339 |
ccs_addprintf(buffer, sizeof(buffer), "-"); |
1340 |
min_type = max_type; |
1341 |
min = max; |
1342 |
} |
1343 |
ccs_io_printf(head, "%s", buffer); |
1344 |
} |
1345 |
} |
1346 |
|
1347 |
/** |
1348 |
* ccs_print_number_union - Print a ccs_number_union. |
1349 |
* |
1350 |
* @head: Pointer to "struct ccs_io_buffer". |
1351 |
* @ptr: Pointer to "struct ccs_number_union". |
1352 |
* |
1353 |
* Returns nothing. |
1354 |
*/ |
1355 |
static void ccs_print_number_union(struct ccs_io_buffer *head, |
1356 |
const struct ccs_number_union *ptr) |
1357 |
{ |
1358 |
ccs_set_space(head); |
1359 |
ccs_print_number_union_nospace(head, ptr); |
1360 |
} |
1361 |
|
1362 |
/** |
1363 |
* ccs_print_condition - Print condition part. |
1364 |
* |
1365 |
* @head: Pointer to "struct ccs_io_buffer". |
1366 |
* @cond: Pointer to "struct ccs_condition". |
1367 |
* |
1368 |
* Returns true on success, false otherwise. |
1369 |
*/ |
1370 |
static bool ccs_print_condition(struct ccs_io_buffer *head, |
1371 |
const struct ccs_condition *cond) |
1372 |
{ |
1373 |
switch (head->r.cond_step) { |
1374 |
case 0: |
1375 |
head->r.cond_index = 0; |
1376 |
head->r.cond_step++; |
1377 |
/* fall through */ |
1378 |
case 1: |
1379 |
{ |
1380 |
const u16 condc = cond->condc; |
1381 |
const struct ccs_condition_element *condp = |
1382 |
(typeof(condp)) (cond + 1); |
1383 |
const struct ccs_number_union *numbers_p = |
1384 |
(typeof(numbers_p)) (condp + condc); |
1385 |
const struct ccs_name_union *names_p = |
1386 |
(typeof(names_p)) |
1387 |
(numbers_p + cond->numbers_count); |
1388 |
const struct ccs_argv *argv = |
1389 |
(typeof(argv)) (names_p + cond->names_count); |
1390 |
const struct ccs_envp *envp = |
1391 |
(typeof(envp)) (argv + cond->argc); |
1392 |
u16 skip; |
1393 |
for (skip = 0; skip < head->r.cond_index; skip++) { |
1394 |
const u8 left = condp->left; |
1395 |
const u8 right = condp->right; |
1396 |
condp++; |
1397 |
switch (left) { |
1398 |
case CCS_ARGV_ENTRY: |
1399 |
argv++; |
1400 |
continue; |
1401 |
case CCS_ENVP_ENTRY: |
1402 |
envp++; |
1403 |
continue; |
1404 |
case CCS_NUMBER_UNION: |
1405 |
numbers_p++; |
1406 |
break; |
1407 |
} |
1408 |
switch (right) { |
1409 |
case CCS_NAME_UNION: |
1410 |
names_p++; |
1411 |
break; |
1412 |
case CCS_NUMBER_UNION: |
1413 |
numbers_p++; |
1414 |
break; |
1415 |
} |
1416 |
} |
1417 |
while (head->r.cond_index < condc) { |
1418 |
const u8 match = condp->equals; |
1419 |
const u8 left = condp->left; |
1420 |
const u8 right = condp->right; |
1421 |
if (!ccs_flush(head)) |
1422 |
return false; |
1423 |
condp++; |
1424 |
head->r.cond_index++; |
1425 |
ccs_set_space(head); |
1426 |
switch (left) { |
1427 |
case CCS_ARGV_ENTRY: |
1428 |
ccs_io_printf(head, |
1429 |
"exec.argv[%lu]%s=\"", |
1430 |
argv->index, |
1431 |
argv->is_not ? "!" : ""); |
1432 |
ccs_set_string(head, |
1433 |
argv->value->name); |
1434 |
ccs_set_string(head, "\""); |
1435 |
argv++; |
1436 |
continue; |
1437 |
case CCS_ENVP_ENTRY: |
1438 |
ccs_set_string(head, "exec.envp[\""); |
1439 |
ccs_set_string(head, envp->name->name); |
1440 |
ccs_io_printf(head, "\"]%s=", |
1441 |
envp->is_not ? "!" : ""); |
1442 |
if (envp->value) { |
1443 |
ccs_set_string(head, "\""); |
1444 |
ccs_set_string(head, envp-> |
1445 |
value->name); |
1446 |
ccs_set_string(head, "\""); |
1447 |
} else { |
1448 |
ccs_set_string(head, "NULL"); |
1449 |
} |
1450 |
envp++; |
1451 |
continue; |
1452 |
case CCS_NUMBER_UNION: |
1453 |
ccs_print_number_union_nospace |
1454 |
(head, numbers_p++); |
1455 |
break; |
1456 |
default: |
1457 |
ccs_set_string(head, |
1458 |
ccs_condition_keyword[left]); |
1459 |
break; |
1460 |
} |
1461 |
ccs_set_string(head, match ? "=" : "!="); |
1462 |
switch (right) { |
1463 |
case CCS_NAME_UNION: |
1464 |
ccs_print_name_union_quoted |
1465 |
(head, names_p++); |
1466 |
break; |
1467 |
case CCS_NUMBER_UNION: |
1468 |
ccs_print_number_union_nospace |
1469 |
(head, numbers_p++); |
1470 |
break; |
1471 |
default: |
1472 |
ccs_set_string(head, |
1473 |
ccs_condition_keyword[right]); |
1474 |
break; |
1475 |
} |
1476 |
} |
1477 |
} |
1478 |
head->r.cond_step++; |
1479 |
/* fall through */ |
1480 |
case 2: |
1481 |
if (!ccs_flush(head)) |
1482 |
break; |
1483 |
head->r.cond_step++; |
1484 |
/* fall through */ |
1485 |
case 3: |
1486 |
if (cond->grant_log != CCS_GRANTLOG_AUTO) |
1487 |
ccs_io_printf(head, " grant_log=%s", |
1488 |
ccs_yesno(cond->grant_log == |
1489 |
CCS_GRANTLOG_YES)); |
1490 |
if (cond->transit) { |
1491 |
const char *name = cond->transit->name; |
1492 |
ccs_set_string(head, *name == '<' ? |
1493 |
" auto_namespace_transition=\"" : |
1494 |
" auto_domain_transition=\""); |
1495 |
ccs_set_string(head, name); |
1496 |
ccs_set_string(head, "\""); |
1497 |
} |
1498 |
ccs_set_lf(head); |
1499 |
return true; |
1500 |
} |
1501 |
return false; |
1502 |
} |
1503 |
|
1504 |
/** |
1505 |
* ccs_set_group - Print "acl_group " header keyword and category name. |
1506 |
* |
1507 |
* @head: Pointer to "struct ccs_io_buffer". |
1508 |
* @category: Category name. |
1509 |
* |
1510 |
* Returns nothing. |
1511 |
*/ |
1512 |
static void ccs_set_group(struct ccs_io_buffer *head, const char *category) |
1513 |
{ |
1514 |
if (head->type == CCS_EXCEPTIONPOLICY) { |
1515 |
ccs_print_namespace(head); |
1516 |
ccs_io_printf(head, "acl_group %u ", head->r.acl_group_index); |
1517 |
} |
1518 |
ccs_set_string(head, category); |
1519 |
} |
1520 |
|
1521 |
/** |
1522 |
* ccs_print_entry - Print an ACL entry. |
1523 |
* |
1524 |
* @head: Pointer to "struct ccs_io_buffer". |
1525 |
* @acl: Pointer to an ACL entry. |
1526 |
* |
1527 |
* Returns true on success, false otherwise. |
1528 |
*/ |
1529 |
static bool ccs_print_entry(struct ccs_io_buffer *head, |
1530 |
const struct ccs_acl_info *acl) |
1531 |
{ |
1532 |
const u8 acl_type = acl->type; |
1533 |
const bool may_trigger_transition = acl->cond && acl->cond->transit; |
1534 |
bool first = true; |
1535 |
u8 bit; |
1536 |
if (head->r.print_cond_part) |
1537 |
goto print_cond_part; |
1538 |
if (acl->is_deleted) |
1539 |
return true; |
1540 |
if (!ccs_flush(head)) |
1541 |
return false; |
1542 |
else if (acl_type == CCS_TYPE_PATH_ACL) { |
1543 |
struct ccs_path_acl *ptr |
1544 |
= container_of(acl, typeof(*ptr), head); |
1545 |
const u16 perm = ptr->perm; |
1546 |
for (bit = 0; bit < CCS_MAX_PATH_OPERATION; bit++) { |
1547 |
if (!(perm & (1 << bit))) |
1548 |
continue; |
1549 |
if (head->r.print_transition_related_only && |
1550 |
bit != CCS_TYPE_EXECUTE && !may_trigger_transition) |
1551 |
continue; |
1552 |
if (first) { |
1553 |
ccs_set_group(head, "file "); |
1554 |
first = false; |
1555 |
} else { |
1556 |
ccs_set_slash(head); |
1557 |
} |
1558 |
ccs_set_string(head, ccs_path_keyword[bit]); |
1559 |
} |
1560 |
if (first) |
1561 |
return true; |
1562 |
ccs_print_name_union(head, &ptr->name); |
1563 |
} else if (acl_type == CCS_TYPE_AUTO_EXECUTE_HANDLER || |
1564 |
acl_type == CCS_TYPE_DENIED_EXECUTE_HANDLER) { |
1565 |
struct ccs_handler_acl *ptr |
1566 |
= container_of(acl, typeof(*ptr), head); |
1567 |
ccs_set_group(head, "task "); |
1568 |
ccs_set_string(head, acl_type == CCS_TYPE_AUTO_EXECUTE_HANDLER |
1569 |
? "auto_execute_handler " : |
1570 |
"denied_execute_handler "); |
1571 |
ccs_set_string(head, ptr->handler->name); |
1572 |
} else if (acl_type == CCS_TYPE_AUTO_TASK_ACL || |
1573 |
acl_type == CCS_TYPE_MANUAL_TASK_ACL) { |
1574 |
struct ccs_task_acl *ptr = |
1575 |
container_of(acl, typeof(*ptr), head); |
1576 |
ccs_set_group(head, "task "); |
1577 |
ccs_set_string(head, acl_type == CCS_TYPE_AUTO_TASK_ACL ? |
1578 |
"auto_domain_transition " : |
1579 |
"manual_domain_transition "); |
1580 |
ccs_set_string(head, ptr->domainname->name); |
1581 |
} else if (head->r.print_transition_related_only && |
1582 |
!may_trigger_transition) { |
1583 |
return true; |
1584 |
} else if (acl_type == CCS_TYPE_MKDEV_ACL) { |
1585 |
struct ccs_mkdev_acl *ptr = |
1586 |
container_of(acl, typeof(*ptr), head); |
1587 |
const u8 perm = ptr->perm; |
1588 |
for (bit = 0; bit < CCS_MAX_MKDEV_OPERATION; bit++) { |
1589 |
if (!(perm & (1 << bit))) |
1590 |
continue; |
1591 |
if (first) { |
1592 |
ccs_set_group(head, "file "); |
1593 |
first = false; |
1594 |
} else { |
1595 |
ccs_set_slash(head); |
1596 |
} |
1597 |
ccs_set_string(head, ccs_mac_keywords |
1598 |
[ccs_pnnn2mac[bit]]); |
1599 |
} |
1600 |
if (first) |
1601 |
return true; |
1602 |
ccs_print_name_union(head, &ptr->name); |
1603 |
ccs_print_number_union(head, &ptr->mode); |
1604 |
ccs_print_number_union(head, &ptr->major); |
1605 |
ccs_print_number_union(head, &ptr->minor); |
1606 |
} else if (acl_type == CCS_TYPE_PATH2_ACL) { |
1607 |
struct ccs_path2_acl *ptr = |
1608 |
container_of(acl, typeof(*ptr), head); |
1609 |
const u8 perm = ptr->perm; |
1610 |
for (bit = 0; bit < CCS_MAX_PATH2_OPERATION; bit++) { |
1611 |
if (!(perm & (1 << bit))) |
1612 |
continue; |
1613 |
if (first) { |
1614 |
ccs_set_group(head, "file "); |
1615 |
first = false; |
1616 |
} else { |
1617 |
ccs_set_slash(head); |
1618 |
} |
1619 |
ccs_set_string(head, ccs_mac_keywords |
1620 |
[ccs_pp2mac[bit]]); |
1621 |
} |
1622 |
if (first) |
1623 |
return true; |
1624 |
ccs_print_name_union(head, &ptr->name1); |
1625 |
ccs_print_name_union(head, &ptr->name2); |
1626 |
} else if (acl_type == CCS_TYPE_PATH_NUMBER_ACL) { |
1627 |
struct ccs_path_number_acl *ptr = |
1628 |
container_of(acl, typeof(*ptr), head); |
1629 |
const u8 perm = ptr->perm; |
1630 |
for (bit = 0; bit < CCS_MAX_PATH_NUMBER_OPERATION; bit++) { |
1631 |
if (!(perm & (1 << bit))) |
1632 |
continue; |
1633 |
if (first) { |
1634 |
ccs_set_group(head, "file "); |
1635 |
first = false; |
1636 |
} else { |
1637 |
ccs_set_slash(head); |
1638 |
} |
1639 |
ccs_set_string(head, ccs_mac_keywords |
1640 |
[ccs_pn2mac[bit]]); |
1641 |
} |
1642 |
if (first) |
1643 |
return true; |
1644 |
ccs_print_name_union(head, &ptr->name); |
1645 |
ccs_print_number_union(head, &ptr->number); |
1646 |
} else if (acl_type == CCS_TYPE_ENV_ACL) { |
1647 |
struct ccs_env_acl *ptr = |
1648 |
container_of(acl, typeof(*ptr), head); |
1649 |
ccs_set_group(head, "misc env "); |
1650 |
ccs_set_string(head, ptr->env->name); |
1651 |
} else if (acl_type == CCS_TYPE_CAPABILITY_ACL) { |
1652 |
struct ccs_capability_acl *ptr = |
1653 |
container_of(acl, typeof(*ptr), head); |
1654 |
ccs_set_group(head, "capability "); |
1655 |
ccs_set_string(head, ccs_mac_keywords |
1656 |
[ccs_c2mac[ptr->operation]]); |
1657 |
} else if (acl_type == CCS_TYPE_INET_ACL) { |
1658 |
struct ccs_inet_acl *ptr = |
1659 |
container_of(acl, typeof(*ptr), head); |
1660 |
const u8 perm = ptr->perm; |
1661 |
for (bit = 0; bit < CCS_MAX_NETWORK_OPERATION; bit++) { |
1662 |
if (!(perm & (1 << bit))) |
1663 |
continue; |
1664 |
if (first) { |
1665 |
ccs_set_group(head, "network inet "); |
1666 |
ccs_set_string(head, ccs_proto_keyword |
1667 |
[ptr->protocol]); |
1668 |
ccs_set_space(head); |
1669 |
first = false; |
1670 |
} else { |
1671 |
ccs_set_slash(head); |
1672 |
} |
1673 |
ccs_set_string(head, ccs_socket_keyword[bit]); |
1674 |
} |
1675 |
if (first) |
1676 |
return true; |
1677 |
ccs_set_space(head); |
1678 |
if (ptr->address.group) { |
1679 |
ccs_set_string(head, "@"); |
1680 |
ccs_set_string(head, |
1681 |
ptr->address.group->group_name->name); |
1682 |
} else { |
1683 |
char buf[128]; |
1684 |
ccs_print_ip(buf, sizeof(buf), &ptr->address); |
1685 |
ccs_io_printf(head, "%s", buf); |
1686 |
} |
1687 |
ccs_print_number_union(head, &ptr->port); |
1688 |
} else if (acl_type == CCS_TYPE_UNIX_ACL) { |
1689 |
struct ccs_unix_acl *ptr = |
1690 |
container_of(acl, typeof(*ptr), head); |
1691 |
const u8 perm = ptr->perm; |
1692 |
for (bit = 0; bit < CCS_MAX_NETWORK_OPERATION; bit++) { |
1693 |
if (!(perm & (1 << bit))) |
1694 |
continue; |
1695 |
if (first) { |
1696 |
ccs_set_group(head, "network unix "); |
1697 |
ccs_set_string(head, ccs_proto_keyword |
1698 |
[ptr->protocol]); |
1699 |
ccs_set_space(head); |
1700 |
first = false; |
1701 |
} else { |
1702 |
ccs_set_slash(head); |
1703 |
} |
1704 |
ccs_set_string(head, ccs_socket_keyword[bit]); |
1705 |
} |
1706 |
if (first) |
1707 |
return true; |
1708 |
ccs_print_name_union(head, &ptr->name); |
1709 |
} else if (acl_type == CCS_TYPE_SIGNAL_ACL) { |
1710 |
struct ccs_signal_acl *ptr = |
1711 |
container_of(acl, typeof(*ptr), head); |
1712 |
ccs_set_group(head, "ipc signal "); |
1713 |
ccs_print_number_union_nospace(head, &ptr->sig); |
1714 |
ccs_set_space(head); |
1715 |
ccs_set_string(head, ptr->domainname->name); |
1716 |
} else if (acl_type == CCS_TYPE_MOUNT_ACL) { |
1717 |
struct ccs_mount_acl *ptr = |
1718 |
container_of(acl, typeof(*ptr), head); |
1719 |
ccs_set_group(head, "file mount"); |
1720 |
ccs_print_name_union(head, &ptr->dev_name); |
1721 |
ccs_print_name_union(head, &ptr->dir_name); |
1722 |
ccs_print_name_union(head, &ptr->fs_type); |
1723 |
ccs_print_number_union(head, &ptr->flags); |
1724 |
} |
1725 |
if (acl->cond) { |
1726 |
head->r.print_cond_part = true; |
1727 |
head->r.cond_step = 0; |
1728 |
if (!ccs_flush(head)) |
1729 |
return false; |
1730 |
print_cond_part: |
1731 |
if (!ccs_print_condition(head, acl->cond)) |
1732 |
return false; |
1733 |
head->r.print_cond_part = false; |
1734 |
} else { |
1735 |
ccs_set_lf(head); |
1736 |
} |
1737 |
return true; |
1738 |
} |
1739 |
|
1740 |
/** |
1741 |
* ccs_read_domain2 - Read domain policy. |
1742 |
* |
1743 |
* @head: Pointer to "struct ccs_io_buffer". |
1744 |
* @list: Pointer to "struct list_head". |
1745 |
* |
1746 |
* Returns true on success, false otherwise. |
1747 |
* |
1748 |
* Caller holds ccs_read_lock(). |
1749 |
*/ |
1750 |
static bool ccs_read_domain2(struct ccs_io_buffer *head, |
1751 |
struct list_head *list) |
1752 |
{ |
1753 |
list_for_each_cookie(head->r.acl, list) { |
1754 |
struct ccs_acl_info *ptr = |
1755 |
list_entry(head->r.acl, typeof(*ptr), list); |
1756 |
if (!ccs_print_entry(head, ptr)) |
1757 |
return false; |
1758 |
} |
1759 |
head->r.acl = NULL; |
1760 |
return true; |
1761 |
} |
1762 |
|
1763 |
/** |
1764 |
* ccs_read_domain - Read domain policy. |
1765 |
* |
1766 |
* @head: Pointer to "struct ccs_io_buffer". |
1767 |
* |
1768 |
* Returns nothing. |
1769 |
* |
1770 |
* Caller holds ccs_read_lock(). |
1771 |
*/ |
1772 |
static void ccs_read_domain(struct ccs_io_buffer *head) |
1773 |
{ |
1774 |
if (head->r.eof) |
1775 |
return; |
1776 |
list_for_each_cookie(head->r.domain, &ccs_domain_list) { |
1777 |
struct ccs_domain_info *domain = |
1778 |
list_entry(head->r.domain, typeof(*domain), list); |
1779 |
switch (head->r.step) { |
1780 |
u8 i; |
1781 |
case 0: |
1782 |
if (domain->is_deleted && |
1783 |
!head->r.print_this_domain_only) |
1784 |
continue; |
1785 |
/* Print domainname and flags. */ |
1786 |
ccs_set_string(head, domain->domainname->name); |
1787 |
ccs_set_lf(head); |
1788 |
ccs_io_printf(head, "use_profile %u\n", |
1789 |
domain->profile); |
1790 |
ccs_io_printf(head, "use_group %u\n", domain->group); |
1791 |
for (i = 0; i < CCS_MAX_DOMAIN_INFO_FLAGS; i++) |
1792 |
if (domain->flags[i]) |
1793 |
ccs_set_string(head, ccs_dif[i]); |
1794 |
head->r.step++; |
1795 |
ccs_set_lf(head); |
1796 |
/* fall through */ |
1797 |
case 1: |
1798 |
if (!ccs_read_domain2(head, &domain->acl_info_list[0])) |
1799 |
return; |
1800 |
head->r.step++; |
1801 |
/* fall through */ |
1802 |
case 2: |
1803 |
if (!ccs_read_domain2(head, &domain->acl_info_list[1])) |
1804 |
return; |
1805 |
head->r.step++; |
1806 |
if (!ccs_set_lf(head)) |
1807 |
return; |
1808 |
/* fall through */ |
1809 |
case 3: |
1810 |
head->r.step = 0; |
1811 |
if (head->r.print_this_domain_only) |
1812 |
goto done; |
1813 |
} |
1814 |
} |
1815 |
done: |
1816 |
head->r.eof = true; |
1817 |
} |
1818 |
|
1819 |
/** |
1820 |
* ccs_write_domain_profile - Assign profile for specified domain. |
1821 |
* |
1822 |
* @head: Pointer to "struct ccs_io_buffer". |
1823 |
* |
1824 |
* Returns 0 on success, -EINVAL otherwise. |
1825 |
* |
1826 |
* This is equivalent to doing |
1827 |
* |
1828 |
* ( echo "select " $domainname; echo "use_profile " $profile ) | |
1829 |
* /usr/sbin/ccs-loadpolicy -d |
1830 |
* |
1831 |
* Caller holds ccs_read_lock(). |
1832 |
*/ |
1833 |
static int ccs_write_domain_profile(struct ccs_io_buffer *head) |
1834 |
{ |
1835 |
char *data = head->write_buf; |
1836 |
char *cp = strchr(data, ' '); |
1837 |
struct ccs_domain_info *domain; |
1838 |
unsigned int profile; |
1839 |
if (!cp) |
1840 |
return -EINVAL; |
1841 |
*cp = '\0'; |
1842 |
profile = simple_strtoul(data, NULL, 10); |
1843 |
if (profile >= CCS_MAX_PROFILES) |
1844 |
return -EINVAL; |
1845 |
domain = ccs_find_domain(cp + 1); |
1846 |
if (domain && (!ccs_policy_loaded || |
1847 |
head->w.ns->profile_ptr[(u8) profile])) |
1848 |
domain->profile = (u8) profile; |
1849 |
return 0; |
1850 |
} |
1851 |
|
1852 |
/** |
1853 |
* ccs_read_domain_profile - Read only domainname and profile. |
1854 |
* |
1855 |
* @head: Pointer to "struct ccs_io_buffer". |
1856 |
* |
1857 |
* Returns nothing. |
1858 |
* |
1859 |
* This is equivalent to doing |
1860 |
* |
1861 |
* grep -A 1 '^<kernel>' /proc/ccs/domain_policy | |
1862 |
* awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) |
1863 |
* domainname = $0; } else if ( $1 == "use_profile" ) { |
1864 |
* print $2 " " domainname; domainname = ""; } } ; ' |
1865 |
* |
1866 |
* Caller holds ccs_read_lock(). |
1867 |
*/ |
1868 |
static void ccs_read_domain_profile(struct ccs_io_buffer *head) |
1869 |
{ |
1870 |
if (head->r.eof) |
1871 |
return; |
1872 |
list_for_each_cookie(head->r.domain, &ccs_domain_list) { |
1873 |
struct ccs_domain_info *domain = |
1874 |
list_entry(head->r.domain, typeof(*domain), list); |
1875 |
if (domain->is_deleted) |
1876 |
continue; |
1877 |
if (!ccs_flush(head)) |
1878 |
return; |
1879 |
ccs_io_printf(head, "%u ", domain->profile); |
1880 |
ccs_set_string(head, domain->domainname->name); |
1881 |
ccs_set_lf(head); |
1882 |
} |
1883 |
head->r.eof = true; |
1884 |
} |
1885 |
|
1886 |
/** |
1887 |
* ccs_write_pid - Specify PID to obtain domainname. |
1888 |
* |
1889 |
* @head: Pointer to "struct ccs_io_buffer". |
1890 |
* |
1891 |
* Returns 0. |
1892 |
*/ |
1893 |
static int ccs_write_pid(struct ccs_io_buffer *head) |
1894 |
{ |
1895 |
head->r.eof = false; |
1896 |
return 0; |
1897 |
} |
1898 |
|
1899 |
/** |
1900 |
* ccs_read_pid - Read information of a process. |
1901 |
* |
1902 |
* @head: Pointer to "struct ccs_io_buffer". |
1903 |
* |
1904 |
* Returns the domainname which the specified PID is in or |
1905 |
* process information of the specified PID on success, |
1906 |
* empty string otherwise. |
1907 |
* |
1908 |
* Caller holds ccs_read_lock(). |
1909 |
*/ |
1910 |
static void ccs_read_pid(struct ccs_io_buffer *head) |
1911 |
{ |
1912 |
char *buf = head->write_buf; |
1913 |
bool task_info = false; |
1914 |
bool global_pid = false; |
1915 |
unsigned int pid; |
1916 |
struct task_struct *p; |
1917 |
struct ccs_domain_info *domain = NULL; |
1918 |
u32 ccs_flags = 0; |
1919 |
/* Accessing write_buf is safe because head->io_sem is held. */ |
1920 |
if (!buf) { |
1921 |
head->r.eof = true; |
1922 |
return; /* Do nothing if open(O_RDONLY). */ |
1923 |
} |
1924 |
if (head->r.w_pos || head->r.eof) |
1925 |
return; |
1926 |
head->r.eof = true; |
1927 |
if (ccs_str_starts(&buf, "info ")) |
1928 |
task_info = true; |
1929 |
if (ccs_str_starts(&buf, "global-pid ")) |
1930 |
global_pid = true; |
1931 |
pid = (unsigned int) simple_strtoul(buf, NULL, 10); |
1932 |
ccs_tasklist_lock(); |
1933 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) |
1934 |
if (global_pid) |
1935 |
p = ccsecurity_exports.find_task_by_pid_ns(pid, &init_pid_ns); |
1936 |
else |
1937 |
p = ccsecurity_exports.find_task_by_vpid(pid); |
1938 |
#else |
1939 |
p = find_task_by_pid(pid); |
1940 |
#endif |
1941 |
if (p) { |
1942 |
domain = ccs_task_domain(p); |
1943 |
ccs_flags = ccs_task_flags(p); |
1944 |
} |
1945 |
ccs_tasklist_unlock(); |
1946 |
if (!domain) |
1947 |
return; |
1948 |
if (!task_info) { |
1949 |
ccs_io_printf(head, "%u %u ", pid, domain->profile); |
1950 |
ccs_set_string(head, domain->domainname->name); |
1951 |
} else { |
1952 |
ccs_io_printf(head, "%u manager=%s execute_handler=%s ", pid, |
1953 |
ccs_yesno(ccs_flags & |
1954 |
CCS_TASK_IS_MANAGER), |
1955 |
ccs_yesno(ccs_flags & |
1956 |
CCS_TASK_IS_EXECUTE_HANDLER)); |
1957 |
} |
1958 |
} |
1959 |
|
1960 |
/* String table for domain transition control keywords. */ |
1961 |
static const char * const ccs_transition_type[CCS_MAX_TRANSITION_TYPE] = { |
1962 |
[CCS_TRANSITION_CONTROL_NO_NAMESPACE] = "no_move_namespace ", |
1963 |
[CCS_TRANSITION_CONTROL_NAMESPACE] = "move_namespace ", |
1964 |
[CCS_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ", |
1965 |
[CCS_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ", |
1966 |
[CCS_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ", |
1967 |
[CCS_TRANSITION_CONTROL_KEEP] = "keep_domain ", |
1968 |
}; |
1969 |
|
1970 |
/* String table for grouping keywords. */ |
1971 |
static const char * const ccs_group_name[CCS_MAX_GROUP] = { |
1972 |
[CCS_PATH_GROUP] = "path_group ", |
1973 |
[CCS_NUMBER_GROUP] = "number_group ", |
1974 |
[CCS_ADDRESS_GROUP] = "address_group ", |
1975 |
}; |
1976 |
|
1977 |
/** |
1978 |
* ccs_write_exception - Write exception policy. |
1979 |
* |
1980 |
* @head: Pointer to "struct ccs_io_buffer". |
1981 |
* |
1982 |
* Returns 0 on success, negative value otherwise. |
1983 |
*/ |
1984 |
static int ccs_write_exception(struct ccs_io_buffer *head) |
1985 |
{ |
1986 |
const bool is_delete = head->w.is_delete; |
1987 |
struct ccs_acl_param param = { |
1988 |
.ns = head->w.ns, |
1989 |
.is_delete = is_delete, |
1990 |
.data = head->write_buf, |
1991 |
}; |
1992 |
u8 i; |
1993 |
if (ccs_str_starts(¶m.data, "aggregator ")) |
1994 |
return ccs_write_aggregator(¶m); |
1995 |
if (ccs_str_starts(¶m.data, "deny_autobind ")) |
1996 |
return ccs_write_reserved_port(¶m); |
1997 |
for (i = 0; i < CCS_MAX_TRANSITION_TYPE; i++) |
1998 |
if (ccs_str_starts(¶m.data, ccs_transition_type[i])) |
1999 |
return ccs_write_transition_control(¶m, i); |
2000 |
for (i = 0; i < CCS_MAX_GROUP; i++) |
2001 |
if (ccs_str_starts(¶m.data, ccs_group_name[i])) |
2002 |
return ccs_write_group(¶m, i); |
2003 |
if (ccs_str_starts(¶m.data, "acl_group ")) { |
2004 |
unsigned int group; |
2005 |
char *data; |
2006 |
group = simple_strtoul(param.data, &data, 10); |
2007 |
if (group < CCS_MAX_ACL_GROUPS && *data++ == ' ') |
2008 |
return ccs_write_domain2(head->w.ns, |
2009 |
head->w.ns->acl_group[group], |
2010 |
data, is_delete); |
2011 |
} |
2012 |
return -EINVAL; |
2013 |
} |
2014 |
|
2015 |
/** |
2016 |
* ccs_read_group - Read "struct ccs_path_group"/"struct ccs_number_group"/"struct ccs_address_group" list. |
2017 |
* |
2018 |
* @head: Pointer to "struct ccs_io_buffer". |
2019 |
* @idx: Index number. |
2020 |
* |
2021 |
* Returns true on success, false otherwise. |
2022 |
* |
2023 |
* Caller holds ccs_read_lock(). |
2024 |
*/ |
2025 |
static bool ccs_read_group(struct ccs_io_buffer *head, const int idx) |
2026 |
{ |
2027 |
struct ccs_policy_namespace *ns = container_of(head->r.ns, typeof(*ns), |
2028 |
namespace_list); |
2029 |
struct list_head *list = &ns->group_list[idx]; |
2030 |
list_for_each_cookie(head->r.group, list) { |
2031 |
struct ccs_group *group = |
2032 |
list_entry(head->r.group, typeof(*group), head.list); |
2033 |
list_for_each_cookie(head->r.acl, &group->member_list) { |
2034 |
struct ccs_acl_head *ptr = |
2035 |
list_entry(head->r.acl, typeof(*ptr), list); |
2036 |
if (ptr->is_deleted) |
2037 |
continue; |
2038 |
if (!ccs_flush(head)) |
2039 |
return false; |
2040 |
ccs_print_namespace(head); |
2041 |
ccs_set_string(head, ccs_group_name[idx]); |
2042 |
ccs_set_string(head, group->group_name->name); |
2043 |
if (idx == CCS_PATH_GROUP) { |
2044 |
ccs_set_space(head); |
2045 |
ccs_set_string(head, container_of |
2046 |
(ptr, struct ccs_path_group, |
2047 |
head)->member_name->name); |
2048 |
} else if (idx == CCS_NUMBER_GROUP) { |
2049 |
ccs_print_number_union(head, &container_of |
2050 |
(ptr, struct ccs_number_group, |
2051 |
head)->number); |
2052 |
} else if (idx == CCS_ADDRESS_GROUP) { |
2053 |
char buffer[128]; |
2054 |
struct ccs_address_group *member = |
2055 |
container_of(ptr, typeof(*member), |
2056 |
head); |
2057 |
ccs_print_ip(buffer, sizeof(buffer), |
2058 |
&member->address); |
2059 |
ccs_io_printf(head, " %s", buffer); |
2060 |
} |
2061 |
ccs_set_lf(head); |
2062 |
} |
2063 |
head->r.acl = NULL; |
2064 |
} |
2065 |
head->r.group = NULL; |
2066 |
return true; |
2067 |
} |
2068 |
|
2069 |
/** |
2070 |
* ccs_read_policy - Read "struct ccs_..._entry" list. |
2071 |
* |
2072 |
* @head: Pointer to "struct ccs_io_buffer". |
2073 |
* @idx: Index number. |
2074 |
* |
2075 |
* Returns true on success, false otherwise. |
2076 |
* |
2077 |
* Caller holds ccs_read_lock(). |
2078 |
*/ |
2079 |
static bool ccs_read_policy(struct ccs_io_buffer *head, const int idx) |
2080 |
{ |
2081 |
struct ccs_policy_namespace *ns = container_of(head->r.ns, typeof(*ns), |
2082 |
namespace_list); |
2083 |
struct list_head *list = &ns->policy_list[idx]; |
2084 |
list_for_each_cookie(head->r.acl, list) { |
2085 |
struct ccs_acl_head *acl = |
2086 |
container_of(head->r.acl, typeof(*acl), list); |
2087 |
if (acl->is_deleted) |
2088 |
continue; |
2089 |
if (head->r.print_transition_related_only && |
2090 |
idx != CCS_ID_TRANSITION_CONTROL) |
2091 |
continue; |
2092 |
if (!ccs_flush(head)) |
2093 |
return false; |
2094 |
switch (idx) { |
2095 |
case CCS_ID_TRANSITION_CONTROL: |
2096 |
{ |
2097 |
struct ccs_transition_control *ptr = |
2098 |
container_of(acl, typeof(*ptr), head); |
2099 |
ccs_print_namespace(head); |
2100 |
ccs_set_string(head, |
2101 |
ccs_transition_type[ptr->type]); |
2102 |
ccs_set_string(head, ptr->program ? |
2103 |
ptr->program->name : "any"); |
2104 |
ccs_set_string(head, " from "); |
2105 |
ccs_set_string(head, ptr->domainname ? |
2106 |
ptr->domainname->name : "any"); |
2107 |
} |
2108 |
break; |
2109 |
case CCS_ID_AGGREGATOR: |
2110 |
{ |
2111 |
struct ccs_aggregator *ptr = |
2112 |
container_of(acl, typeof(*ptr), head); |
2113 |
ccs_print_namespace(head); |
2114 |
ccs_set_string(head, "aggregator "); |
2115 |
ccs_set_string(head, ptr->original_name->name); |
2116 |
ccs_set_space(head); |
2117 |
ccs_set_string(head, |
2118 |
ptr->aggregated_name->name); |
2119 |
} |
2120 |
break; |
2121 |
case CCS_ID_RESERVEDPORT: |
2122 |
{ |
2123 |
struct ccs_reserved *ptr = |
2124 |
container_of(acl, typeof(*ptr), head); |
2125 |
ccs_print_namespace(head); |
2126 |
ccs_set_string(head, "deny_autobind "); |
2127 |
ccs_print_number_union_nospace(head, |
2128 |
&ptr->port); |
2129 |
} |
2130 |
break; |
2131 |
default: |
2132 |
continue; |
2133 |
} |
2134 |
ccs_set_lf(head); |
2135 |
} |
2136 |
head->r.acl = NULL; |
2137 |
return true; |
2138 |
} |
2139 |
|
2140 |
/** |
2141 |
* ccs_read_exception - Read exception policy. |
2142 |
* |
2143 |
* @head: Pointer to "struct ccs_io_buffer". |
2144 |
* |
2145 |
* Returns nothing. |
2146 |
* |
2147 |
* Caller holds ccs_read_lock(). |
2148 |
*/ |
2149 |
static void ccs_read_exception(struct ccs_io_buffer *head) |
2150 |
{ |
2151 |
struct ccs_policy_namespace *ns = container_of(head->r.ns, typeof(*ns), |
2152 |
namespace_list); |
2153 |
if (head->r.eof) |
2154 |
return; |
2155 |
while (head->r.step < CCS_MAX_POLICY && |
2156 |
ccs_read_policy(head, head->r.step)) |
2157 |
head->r.step++; |
2158 |
if (head->r.step < CCS_MAX_POLICY) |
2159 |
return; |
2160 |
while (head->r.step < CCS_MAX_POLICY + CCS_MAX_GROUP && |
2161 |
ccs_read_group(head, head->r.step - CCS_MAX_POLICY)) |
2162 |
head->r.step++; |
2163 |
if (head->r.step < CCS_MAX_POLICY + CCS_MAX_GROUP) |
2164 |
return; |
2165 |
while (head->r.step < CCS_MAX_POLICY + CCS_MAX_GROUP |
2166 |
+ CCS_MAX_ACL_GROUPS * 2) { |
2167 |
head->r.acl_group_index = (head->r.step - CCS_MAX_POLICY |
2168 |
- CCS_MAX_GROUP) / 2; |
2169 |
if (!ccs_read_domain2(head, &ns->acl_group |
2170 |
[head->r.acl_group_index] |
2171 |
[head->r.step & 1])) |
2172 |
return; |
2173 |
head->r.step++; |
2174 |
} |
2175 |
head->r.eof = true; |
2176 |
} |
2177 |
|
2178 |
/* Wait queue for kernel -> userspace notification. */ |
2179 |
static DECLARE_WAIT_QUEUE_HEAD(ccs_query_wait); |
2180 |
/* Wait queue for userspace -> kernel notification. */ |
2181 |
static DECLARE_WAIT_QUEUE_HEAD(ccs_answer_wait); |
2182 |
|
2183 |
/* Structure for query. */ |
2184 |
struct ccs_query { |
2185 |
struct list_head list; |
2186 |
char *query; |
2187 |
size_t query_len; |
2188 |
unsigned int serial; |
2189 |
u8 timer; |
2190 |
u8 answer; |
2191 |
u8 retry; |
2192 |
}; |
2193 |
|
2194 |
/* The list for "struct ccs_query". */ |
2195 |
static LIST_HEAD(ccs_query_list); |
2196 |
|
2197 |
/* Lock for manipulating ccs_query_list. */ |
2198 |
static DEFINE_SPINLOCK(ccs_query_list_lock); |
2199 |
|
2200 |
/* Number of "struct file" referring /proc/ccs/query interface. */ |
2201 |
static atomic_t ccs_query_observers = ATOMIC_INIT(0); |
2202 |
|
2203 |
/** |
2204 |
* ccs_truncate - Truncate a line. |
2205 |
* |
2206 |
* @str: String to truncate. |
2207 |
* |
2208 |
* Returns length of truncated @str. |
2209 |
*/ |
2210 |
static int ccs_truncate(char *str) |
2211 |
{ |
2212 |
char *start = str; |
2213 |
while (*(unsigned char *) str > (unsigned char) ' ') |
2214 |
str++; |
2215 |
*str = '\0'; |
2216 |
return strlen(start) + 1; |
2217 |
} |
2218 |
|
2219 |
/** |
2220 |
* ccs_add_entry - Add an ACL to current thread's domain. Used by learning mode. |
2221 |
* |
2222 |
* @header: Lines containing ACL. |
2223 |
* |
2224 |
* Returns nothing. |
2225 |
*/ |
2226 |
static void ccs_add_entry(char *header) |
2227 |
{ |
2228 |
char *buffer; |
2229 |
char *realpath = NULL; |
2230 |
char *argv0 = NULL; |
2231 |
char *symlink = NULL; |
2232 |
char *handler; |
2233 |
char *cp = strchr(header, '\n'); |
2234 |
int len; |
2235 |
if (!cp) |
2236 |
return; |
2237 |
cp = strchr(cp + 1, '\n'); |
2238 |
if (!cp) |
2239 |
return; |
2240 |
*cp++ = '\0'; |
2241 |
len = strlen(cp) + 1; |
2242 |
/* strstr() will return NULL if ordering is wrong. */ |
2243 |
if (*cp == 'f') { |
2244 |
argv0 = strstr(header, " argv[]={ \""); |
2245 |
if (argv0) { |
2246 |
argv0 += 10; |
2247 |
len += ccs_truncate(argv0) + 14; |
2248 |
} |
2249 |
realpath = strstr(header, " exec={ realpath=\""); |
2250 |
if (realpath) { |
2251 |
realpath += 8; |
2252 |
len += ccs_truncate(realpath) + 6; |
2253 |
} |
2254 |
symlink = strstr(header, " symlink.target=\""); |
2255 |
if (symlink) |
2256 |
len += ccs_truncate(symlink + 1) + 1; |
2257 |
} |
2258 |
handler = strstr(header, "type=execute_handler"); |
2259 |
if (handler) |
2260 |
len += ccs_truncate(handler) + 6; |
2261 |
buffer = kmalloc(len, CCS_GFP_FLAGS); |
2262 |
if (!buffer) |
2263 |
return; |
2264 |
snprintf(buffer, len - 1, "%s", cp); |
2265 |
if (handler) |
2266 |
ccs_addprintf(buffer, len, " task.%s", handler); |
2267 |
if (realpath) |
2268 |
ccs_addprintf(buffer, len, " exec.%s", realpath); |
2269 |
if (argv0) |
2270 |
ccs_addprintf(buffer, len, " exec.argv[0]=%s", argv0); |
2271 |
if (symlink) |
2272 |
ccs_addprintf(buffer, len, "%s", symlink); |
2273 |
ccs_normalize_line(buffer); |
2274 |
{ |
2275 |
struct ccs_domain_info *domain = ccs_current_domain(); |
2276 |
if (!ccs_write_domain2(domain->ns, domain->acl_info_list, |
2277 |
buffer, false)) |
2278 |
ccs_update_stat(CCS_STAT_POLICY_UPDATES); |
2279 |
} |
2280 |
kfree(buffer); |
2281 |
} |
2282 |
|
2283 |
/** |
2284 |
* ccs_supervisor - Ask for the supervisor's decision. |
2285 |
* |
2286 |
* @r: Pointer to "struct ccs_request_info". |
2287 |
* @fmt: The printf()'s format string, followed by parameters. |
2288 |
* |
2289 |
* Returns 0 if the supervisor decided to permit the access request which |
2290 |
* violated the policy in enforcing mode, CCS_RETRY_REQUEST if the supervisor |
2291 |
* decided to retry the access request which violated the policy in enforcing |
2292 |
* mode, 0 if it is not in enforcing mode, -EPERM otherwise. |
2293 |
*/ |
2294 |
int ccs_supervisor(struct ccs_request_info *r, const char *fmt, ...) |
2295 |
{ |
2296 |
va_list args; |
2297 |
int error; |
2298 |
int len; |
2299 |
static unsigned int ccs_serial; |
2300 |
struct ccs_query entry = { }; |
2301 |
bool quota_exceeded = false; |
2302 |
va_start(args, fmt); |
2303 |
len = vsnprintf((char *) &len, 1, fmt, args) + 1; |
2304 |
va_end(args); |
2305 |
/* Write /proc/ccs/audit. */ |
2306 |
va_start(args, fmt); |
2307 |
ccs_write_log2(r, len, fmt, args); |
2308 |
va_end(args); |
2309 |
/* Nothing more to do if granted. */ |
2310 |
if (r->granted) |
2311 |
return 0; |
2312 |
if (r->mode) |
2313 |
ccs_update_stat(r->mode); |
2314 |
switch (r->mode) { |
2315 |
int i; |
2316 |
struct ccs_profile *p; |
2317 |
case CCS_CONFIG_ENFORCING: |
2318 |
error = -EPERM; |
2319 |
if (atomic_read(&ccs_query_observers)) |
2320 |
break; |
2321 |
if (r->dont_sleep_on_enforce_error) |
2322 |
goto out; |
2323 |
p = ccs_profile(r->profile); |
2324 |
/* Check enforcing_penalty parameter. */ |
2325 |
for (i = 0; i < p->pref[CCS_PREF_ENFORCING_PENALTY]; i++) { |
2326 |
set_current_state(TASK_INTERRUPTIBLE); |
2327 |
schedule_timeout(HZ / 10); |
2328 |
} |
2329 |
goto out; |
2330 |
case CCS_CONFIG_LEARNING: |
2331 |
error = 0; |
2332 |
/* Check max_learning_entry parameter. */ |
2333 |
if (ccs_domain_quota_ok(r)) |
2334 |
break; |
2335 |
/* fall through */ |
2336 |
default: |
2337 |
return 0; |
2338 |
} |
2339 |
/* Get message. */ |
2340 |
va_start(args, fmt); |
2341 |
entry.query = ccs_init_log(r, len, fmt, args); |
2342 |
va_end(args); |
2343 |
if (!entry.query) |
2344 |
goto out; |
2345 |
entry.query_len = strlen(entry.query) + 1; |
2346 |
if (!error) { |
2347 |
ccs_add_entry(entry.query); |
2348 |
goto out; |
2349 |
} |
2350 |
len = ccs_round2(entry.query_len); |
2351 |
spin_lock(&ccs_query_list_lock); |
2352 |
if (ccs_memory_quota[CCS_MEMORY_QUERY] && |
2353 |
ccs_memory_used[CCS_MEMORY_QUERY] + len |
2354 |
>= ccs_memory_quota[CCS_MEMORY_QUERY]) { |
2355 |
quota_exceeded = true; |
2356 |
} else { |
2357 |
entry.serial = ccs_serial++; |
2358 |
entry.retry = r->retry; |
2359 |
ccs_memory_used[CCS_MEMORY_QUERY] += len; |
2360 |
list_add_tail(&entry.list, &ccs_query_list); |
2361 |
} |
2362 |
spin_unlock(&ccs_query_list_lock); |
2363 |
if (quota_exceeded) |
2364 |
goto out; |
2365 |
/* Give 10 seconds for supervisor's opinion. */ |
2366 |
while (entry.timer < 10) { |
2367 |
wake_up_all(&ccs_query_wait); |
2368 |
if (wait_event_interruptible_timeout |
2369 |
(ccs_answer_wait, entry.answer || |
2370 |
!atomic_read(&ccs_query_observers), HZ)) |
2371 |
break; |
2372 |
else |
2373 |
entry.timer++; |
2374 |
} |
2375 |
spin_lock(&ccs_query_list_lock); |
2376 |
list_del(&entry.list); |
2377 |
ccs_memory_used[CCS_MEMORY_QUERY] -= len; |
2378 |
spin_unlock(&ccs_query_list_lock); |
2379 |
switch (entry.answer) { |
2380 |
case 3: /* Asked to retry by administrator. */ |
2381 |
error = CCS_RETRY_REQUEST; |
2382 |
r->retry++; |
2383 |
break; |
2384 |
case 1: |
2385 |
/* Granted by administrator. */ |
2386 |
error = 0; |
2387 |
break; |
2388 |
default: |
2389 |
/* Timed out or rejected by administrator. */ |
2390 |
break; |
2391 |
} |
2392 |
out: |
2393 |
kfree(entry.query); |
2394 |
return error; |
2395 |
} |
2396 |
|
2397 |
/** |
2398 |
* ccs_poll_query - poll() for /proc/ccs/query. |
2399 |
* |
2400 |
* @file: Pointer to "struct file". |
2401 |
* @wait: Pointer to "poll_table". |
2402 |
* |
2403 |
* Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. |
2404 |
* |
2405 |
* Waits for access requests which violated policy in enforcing mode. |
2406 |
*/ |
2407 |
static int ccs_poll_query(struct file *file, poll_table *wait) |
2408 |
{ |
2409 |
struct list_head *tmp; |
2410 |
bool found = false; |
2411 |
u8 i; |
2412 |
for (i = 0; i < 2; i++) { |
2413 |
spin_lock(&ccs_query_list_lock); |
2414 |
list_for_each(tmp, &ccs_query_list) { |
2415 |
struct ccs_query *ptr = |
2416 |
list_entry(tmp, typeof(*ptr), list); |
2417 |
if (ptr->answer) |
2418 |
continue; |
2419 |
found = true; |
2420 |
break; |
2421 |
} |
2422 |
spin_unlock(&ccs_query_list_lock); |
2423 |
if (found) |
2424 |
return POLLIN | POLLRDNORM; |
2425 |
if (i) |
2426 |
break; |
2427 |
poll_wait(file, &ccs_query_wait, wait); |
2428 |
} |
2429 |
return 0; |
2430 |
} |
2431 |
|
2432 |
/** |
2433 |
* ccs_read_query - Read access requests which violated policy in enforcing mode. |
2434 |
* |
2435 |
* @head: Pointer to "struct ccs_io_buffer". |
2436 |
* |
2437 |
* Returns nothing. |
2438 |
*/ |
2439 |
static void ccs_read_query(struct ccs_io_buffer *head) |
2440 |
{ |
2441 |
struct list_head *tmp; |
2442 |
unsigned int pos = 0; |
2443 |
size_t len = 0; |
2444 |
char *buf; |
2445 |
if (head->r.w_pos) |
2446 |
return; |
2447 |
kfree(head->read_buf); |
2448 |
head->read_buf = NULL; |
2449 |
spin_lock(&ccs_query_list_lock); |
2450 |
list_for_each(tmp, &ccs_query_list) { |
2451 |
struct ccs_query *ptr = list_entry(tmp, typeof(*ptr), list); |
2452 |
if (ptr->answer) |
2453 |
continue; |
2454 |
if (pos++ != head->r.query_index) |
2455 |
continue; |
2456 |
len = ptr->query_len; |
2457 |
break; |
2458 |
} |
2459 |
spin_unlock(&ccs_query_list_lock); |
2460 |
if (!len) { |
2461 |
head->r.query_index = 0; |
2462 |
return; |
2463 |
} |
2464 |
buf = kzalloc(len + 32, CCS_GFP_FLAGS); |
2465 |
if (!buf) |
2466 |
return; |
2467 |
pos = 0; |
2468 |
spin_lock(&ccs_query_list_lock); |
2469 |
list_for_each(tmp, &ccs_query_list) { |
2470 |
struct ccs_query *ptr = list_entry(tmp, typeof(*ptr), list); |
2471 |
if (ptr->answer) |
2472 |
continue; |
2473 |
if (pos++ != head->r.query_index) |
2474 |
continue; |
2475 |
/* |
2476 |
* Some query can be skipped because ccs_query_list |
2477 |
* can change, but I don't care. |
2478 |
*/ |
2479 |
if (len == ptr->query_len) |
2480 |
snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial, |
2481 |
ptr->retry, ptr->query); |
2482 |
break; |
2483 |
} |
2484 |
spin_unlock(&ccs_query_list_lock); |
2485 |
if (buf[0]) { |
2486 |
head->read_buf = buf; |
2487 |
head->r.w[head->r.w_pos++] = buf; |
2488 |
head->r.query_index++; |
2489 |
} else { |
2490 |
kfree(buf); |
2491 |
} |
2492 |
} |
2493 |
|
2494 |
/** |
2495 |
* ccs_write_answer - Write the supervisor's decision. |
2496 |
* |
2497 |
* @head: Pointer to "struct ccs_io_buffer". |
2498 |
* |
2499 |
* Returns 0 on success, -EINVAL otherwise. |
2500 |
*/ |
2501 |
static int ccs_write_answer(struct ccs_io_buffer *head) |
2502 |
{ |
2503 |
char *data = head->write_buf; |
2504 |
struct list_head *tmp; |
2505 |
unsigned int serial; |
2506 |
unsigned int answer; |
2507 |
spin_lock(&ccs_query_list_lock); |
2508 |
list_for_each(tmp, &ccs_query_list) { |
2509 |
struct ccs_query *ptr = list_entry(tmp, typeof(*ptr), list); |
2510 |
ptr->timer = 0; |
2511 |
} |
2512 |
spin_unlock(&ccs_query_list_lock); |
2513 |
if (sscanf(data, "A%u=%u", &serial, &answer) != 2) |
2514 |
return -EINVAL; |
2515 |
spin_lock(&ccs_query_list_lock); |
2516 |
list_for_each(tmp, &ccs_query_list) { |
2517 |
struct ccs_query *ptr = list_entry(tmp, typeof(*ptr), list); |
2518 |
if (ptr->serial != serial) |
2519 |
continue; |
2520 |
if (!ptr->answer) |
2521 |
ptr->answer = (u8) answer; |
2522 |
break; |
2523 |
} |
2524 |
spin_unlock(&ccs_query_list_lock); |
2525 |
wake_up_all(&ccs_answer_wait); |
2526 |
return 0; |
2527 |
} |
2528 |
|
2529 |
/** |
2530 |
* ccs_read_version - Get version. |
2531 |
* |
2532 |
* @head: Pointer to "struct ccs_io_buffer". |
2533 |
* |
2534 |
* Returns nothing. |
2535 |
*/ |
2536 |
static void ccs_read_version(struct ccs_io_buffer *head) |
2537 |
{ |
2538 |
if (head->r.eof) |
2539 |
return; |
2540 |
ccs_set_string(head, "1.8.2-pre"); |
2541 |
head->r.eof = true; |
2542 |
} |
2543 |
|
2544 |
/* String table for /proc/ccs/stat interface. */ |
2545 |
static const char * const ccs_policy_headers[CCS_MAX_POLICY_STAT] = { |
2546 |
[CCS_STAT_POLICY_UPDATES] = "update:", |
2547 |
[CCS_STAT_POLICY_LEARNING] = "violation in learning mode:", |
2548 |
[CCS_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:", |
2549 |
[CCS_STAT_POLICY_ENFORCING] = "violation in enforcing mode:", |
2550 |
}; |
2551 |
|
2552 |
/* String table for /proc/ccs/stat interface. */ |
2553 |
static const char * const ccs_memory_headers[CCS_MAX_MEMORY_STAT] = { |
2554 |
[CCS_MEMORY_POLICY] = "policy:", |
2555 |
[CCS_MEMORY_AUDIT] = "audit log:", |
2556 |
[CCS_MEMORY_QUERY] = "query message:", |
2557 |
}; |
2558 |
|
2559 |
/* Timestamp counter for last updated. */ |
2560 |
static unsigned int ccs_stat_updated[CCS_MAX_POLICY_STAT]; |
2561 |
/* Counter for number of updates. */ |
2562 |
static unsigned int ccs_stat_modified[CCS_MAX_POLICY_STAT]; |
2563 |
|
2564 |
/** |
2565 |
* ccs_update_stat - Update statistic counters. |
2566 |
* |
2567 |
* @index: Index for policy type. |
2568 |
* |
2569 |
* Returns nothing. |
2570 |
*/ |
2571 |
void ccs_update_stat(const u8 index) |
2572 |
{ |
2573 |
struct timeval tv; |
2574 |
do_gettimeofday(&tv); |
2575 |
/* |
2576 |
* I don't use atomic operations because race condition is not fatal. |
2577 |
*/ |
2578 |
ccs_stat_updated[index]++; |
2579 |
ccs_stat_modified[index] = tv.tv_sec; |
2580 |
} |
2581 |
|
2582 |
/** |
2583 |
* ccs_read_stat - Read statistic data. |
2584 |
* |
2585 |
* @head: Pointer to "struct ccs_io_buffer". |
2586 |
* |
2587 |
* Returns nothing. |
2588 |
*/ |
2589 |
static void ccs_read_stat(struct ccs_io_buffer *head) |
2590 |
{ |
2591 |
u8 i; |
2592 |
unsigned int total = 0; |
2593 |
if (head->r.eof) |
2594 |
return; |
2595 |
for (i = 0; i < CCS_MAX_POLICY_STAT; i++) { |
2596 |
ccs_io_printf(head, "Policy %-30s %10u", ccs_policy_headers[i], |
2597 |
ccs_stat_updated[i]); |
2598 |
if (ccs_stat_modified[i]) { |
2599 |
struct ccs_time stamp; |
2600 |
ccs_convert_time(ccs_stat_modified[i], &stamp); |
2601 |
ccs_io_printf(head, " (Last: %04u/%02u/%02u " |
2602 |
"%02u:%02u:%02u)", |
2603 |
stamp.year, stamp.month, stamp.day, |
2604 |
stamp.hour, stamp.min, stamp.sec); |
2605 |
} |
2606 |
ccs_set_lf(head); |
2607 |
} |
2608 |
for (i = 0; i < CCS_MAX_MEMORY_STAT; i++) { |
2609 |
unsigned int used = ccs_memory_used[i]; |
2610 |
total += used; |
2611 |
ccs_io_printf(head, "Memory used by %-22s %10u", |
2612 |
ccs_memory_headers[i], used); |
2613 |
used = ccs_memory_quota[i]; |
2614 |
if (used) |
2615 |
ccs_io_printf(head, " (Quota: %10u)", used); |
2616 |
ccs_set_lf(head); |
2617 |
} |
2618 |
ccs_io_printf(head, "Total memory used: %10u\n", |
2619 |
total); |
2620 |
head->r.eof = true; |
2621 |
} |
2622 |
|
2623 |
/** |
2624 |
* ccs_write_stat - Set memory quota. |
2625 |
* |
2626 |
* @head: Pointer to "struct ccs_io_buffer". |
2627 |
* |
2628 |
* Returns 0. |
2629 |
*/ |
2630 |
static int ccs_write_stat(struct ccs_io_buffer *head) |
2631 |
{ |
2632 |
char *data = head->write_buf; |
2633 |
u8 i; |
2634 |
if (ccs_str_starts(&data, "Memory used by ")) |
2635 |
for (i = 0; i < CCS_MAX_MEMORY_STAT; i++) |
2636 |
if (ccs_str_starts(&data, ccs_memory_headers[i])) |
2637 |
ccs_memory_quota[i] = |
2638 |
simple_strtoul(data, NULL, 10); |
2639 |
return 0; |
2640 |
} |
2641 |
|
2642 |
/** |
2643 |
* ccs_open_control - open() for /proc/ccs/ interface. |
2644 |
* |
2645 |
* @type: Type of interface. |
2646 |
* @file: Pointer to "struct file". |
2647 |
* |
2648 |
* Returns 0 on success, negative value otherwise. |
2649 |
*/ |
2650 |
int ccs_open_control(const u8 type, struct file *file) |
2651 |
{ |
2652 |
struct ccs_io_buffer *head = kzalloc(sizeof(*head), CCS_GFP_FLAGS); |
2653 |
if (!head) |
2654 |
return -ENOMEM; |
2655 |
head->original_ns = ccs_current_namespace(); |
2656 |
mutex_init(&head->io_sem); |
2657 |
head->type = type; |
2658 |
switch (type) { |
2659 |
case CCS_DOMAINPOLICY: /* /proc/ccs/domain_policy */ |
2660 |
head->write = ccs_write_domain; |
2661 |
head->read = ccs_read_domain; |
2662 |
break; |
2663 |
case CCS_EXCEPTIONPOLICY: /* /proc/ccs/exception_policy */ |
2664 |
head->write = ccs_write_exception; |
2665 |
head->read = ccs_read_exception; |
2666 |
break; |
2667 |
case CCS_AUDIT: /* /proc/ccs/audit */ |
2668 |
head->poll = ccs_poll_log; |
2669 |
head->read = ccs_read_log; |
2670 |
break; |
2671 |
case CCS_DOMAIN_STATUS: /* /proc/ccs/.domain_status */ |
2672 |
head->write = ccs_write_domain_profile; |
2673 |
head->read = ccs_read_domain_profile; |
2674 |
break; |
2675 |
case CCS_EXECUTE_HANDLER: /* /proc/ccs/.execute_handler */ |
2676 |
/* Allow execute_handler to read process's status. */ |
2677 |
if (!(ccs_current_flags() & CCS_TASK_IS_EXECUTE_HANDLER)) { |
2678 |
kfree(head); |
2679 |
return -EPERM; |
2680 |
} |
2681 |
/* fall through */ |
2682 |
case CCS_PROCESS_STATUS: /* /proc/ccs/.process_status */ |
2683 |
head->write = ccs_write_pid; |
2684 |
head->read = ccs_read_pid; |
2685 |
break; |
2686 |
case CCS_VERSION: /* /proc/ccs/version */ |
2687 |
head->read = ccs_read_version; |
2688 |
head->readbuf_size = 128; |
2689 |
break; |
2690 |
case CCS_STAT: /* /proc/ccs/stat */ |
2691 |
head->write = ccs_write_stat; |
2692 |
head->read = ccs_read_stat; |
2693 |
head->readbuf_size = 1024; |
2694 |
break; |
2695 |
case CCS_PROFILE: /* /proc/ccs/profile */ |
2696 |
head->write = ccs_write_profile; |
2697 |
head->read = ccs_read_profile; |
2698 |
break; |
2699 |
case CCS_QUERY: /* /proc/ccs/query */ |
2700 |
head->poll = ccs_poll_query; |
2701 |
head->write = ccs_write_answer; |
2702 |
head->read = ccs_read_query; |
2703 |
break; |
2704 |
case CCS_MANAGER: /* /proc/ccs/manager */ |
2705 |
head->write = ccs_write_manager; |
2706 |
head->read = ccs_read_manager; |
2707 |
break; |
2708 |
} |
2709 |
if (!(file->f_mode & FMODE_READ)) { |
2710 |
/* |
2711 |
* No need to allocate read_buf since it is not opened |
2712 |
* for reading. |
2713 |
*/ |
2714 |
head->read = NULL; |
2715 |
head->poll = NULL; |
2716 |
} else if (!head->poll) { |
2717 |
/* Don't allocate read_buf for poll() access. */ |
2718 |
if (!head->readbuf_size) |
2719 |
head->readbuf_size = 4096; |
2720 |
head->read_buf = kzalloc(head->readbuf_size, CCS_GFP_FLAGS); |
2721 |
if (!head->read_buf) { |
2722 |
kfree(head); |
2723 |
return -ENOMEM; |
2724 |
} |
2725 |
} |
2726 |
if (!(file->f_mode & FMODE_WRITE)) { |
2727 |
/* |
2728 |
* No need to allocate write_buf since it is not opened |
2729 |
* for writing. |
2730 |
*/ |
2731 |
head->write = NULL; |
2732 |
} else if (head->write) { |
2733 |
head->writebuf_size = 4096; |
2734 |
head->write_buf = kzalloc(head->writebuf_size, CCS_GFP_FLAGS); |
2735 |
if (!head->write_buf) { |
2736 |
kfree(head->read_buf); |
2737 |
kfree(head); |
2738 |
return -ENOMEM; |
2739 |
} |
2740 |
} |
2741 |
/* |
2742 |
* If the file is /proc/ccs/query, increment the observer counter. |
2743 |
* The obserber counter is used by ccs_supervisor() to see if |
2744 |
* there is some process monitoring /proc/ccs/query. |
2745 |
*/ |
2746 |
if (type == CCS_QUERY) |
2747 |
atomic_inc(&ccs_query_observers); |
2748 |
file->private_data = head; |
2749 |
ccs_notify_gc(head, true); |
2750 |
return 0; |
2751 |
} |
2752 |
|
2753 |
/** |
2754 |
* ccs_poll_control - poll() for /proc/ccs/ interface. |
2755 |
* |
2756 |
* @file: Pointer to "struct file". |
2757 |
* @wait: Pointer to "poll_table". |
2758 |
* |
2759 |
* Returns return value of poll(). |
2760 |
* |
2761 |
* Waits for read readiness. |
2762 |
* /proc/ccs/query is handled by /usr/sbin/ccs-queryd and |
2763 |
* /proc/ccs/audit is handled by /usr/sbin/ccs-auditd. |
2764 |
*/ |
2765 |
int ccs_poll_control(struct file *file, poll_table *wait) |
2766 |
{ |
2767 |
struct ccs_io_buffer *head = file->private_data; |
2768 |
if (!head->poll) |
2769 |
return -ENOSYS; |
2770 |
return head->poll(file, wait); |
2771 |
} |
2772 |
|
2773 |
/** |
2774 |
* ccs_move_namespace_cursor - Print namespace delimiter if needed. |
2775 |
* |
2776 |
* @head: Pointer to "struct ccs_io_buffer". |
2777 |
* |
2778 |
* Returns nothing. |
2779 |
*/ |
2780 |
static inline void ccs_move_namespace_cursor(struct ccs_io_buffer *head) |
2781 |
{ |
2782 |
struct list_head *ns; |
2783 |
if (head->type != CCS_EXCEPTIONPOLICY && head->type != CCS_PROFILE) |
2784 |
return; |
2785 |
/* |
2786 |
* If this is the first read, or reading previous namespace finished |
2787 |
* and has more namespaces to read, update the namespace cursor. |
2788 |
*/ |
2789 |
ns = head->r.ns; |
2790 |
if (!ns || (head->r.eof && ns->next != &ccs_namespace_list)) { |
2791 |
/* Clearing is OK because ccs_flush() returned true. */ |
2792 |
memset(&head->r, 0, sizeof(head->r)); |
2793 |
head->r.ns = ns ? ns->next : ccs_namespace_list.next; |
2794 |
} |
2795 |
} |
2796 |
|
2797 |
/** |
2798 |
* ccs_has_more_namespace - Check for unread namespaces. |
2799 |
* |
2800 |
* @head: Pointer to "struct ccs_io_buffer". |
2801 |
* |
2802 |
* Returns true if we have more entries to print, false otherwise. |
2803 |
*/ |
2804 |
static inline bool ccs_has_more_namespace(struct ccs_io_buffer *head) |
2805 |
{ |
2806 |
return (head->type == CCS_EXCEPTIONPOLICY || |
2807 |
head->type == CCS_PROFILE) && head->r.eof && |
2808 |
head->r.ns->next != &ccs_namespace_list; |
2809 |
} |
2810 |
|
2811 |
/** |
2812 |
* ccs_read_control - read() for /proc/ccs/ interface. |
2813 |
* |
2814 |
* @file: Pointer to "struct file". |
2815 |
* @buffer: Poiner to buffer to write to. |
2816 |
* @buffer_len: Size of @buffer. |
2817 |
* |
2818 |
* Returns bytes read on success, negative value otherwise. |
2819 |
*/ |
2820 |
ssize_t ccs_read_control(struct file *file, char __user *buffer, |
2821 |
const size_t buffer_len) |
2822 |
{ |
2823 |
int len; |
2824 |
struct ccs_io_buffer *head = file->private_data; |
2825 |
int idx; |
2826 |
if (!head->read) |
2827 |
return -ENOSYS; |
2828 |
if (!access_ok(VERIFY_WRITE, buffer, buffer_len)) |
2829 |
return -EFAULT; |
2830 |
if (mutex_lock_interruptible(&head->io_sem)) |
2831 |
return -EINTR; |
2832 |
head->read_user_buf = buffer; |
2833 |
head->read_user_buf_avail = buffer_len; |
2834 |
idx = ccs_read_lock(); |
2835 |
if (ccs_flush(head)) |
2836 |
/* Call the policy handler. */ |
2837 |
do { |
2838 |
ccs_move_namespace_cursor(head); |
2839 |
head->read(head); |
2840 |
} while (ccs_flush(head) && ccs_has_more_namespace(head)); |
2841 |
ccs_read_unlock(idx); |
2842 |
len = head->read_user_buf - buffer; |
2843 |
mutex_unlock(&head->io_sem); |
2844 |
return len; |
2845 |
} |
2846 |
|
2847 |
/** |
2848 |
* ccs_write_control - write() for /proc/ccs/ interface. |
2849 |
* |
2850 |
* @file: Pointer to "struct file". |
2851 |
* @buffer: Pointer to buffer to read from. |
2852 |
* @buffer_len: Size of @buffer. |
2853 |
* |
2854 |
* Returns @buffer_len on success, negative value otherwise. |
2855 |
*/ |
2856 |
ssize_t ccs_write_control(struct file *file, const char __user *buffer, |
2857 |
const size_t buffer_len) |
2858 |
{ |
2859 |
struct ccs_io_buffer *head = file->private_data; |
2860 |
int error = buffer_len; |
2861 |
size_t avail_len = buffer_len; |
2862 |
char *cp0 = head->write_buf; |
2863 |
int idx; |
2864 |
if (!head->write) |
2865 |
return -ENOSYS; |
2866 |
if (!access_ok(VERIFY_READ, buffer, buffer_len)) |
2867 |
return -EFAULT; |
2868 |
if (mutex_lock_interruptible(&head->io_sem)) |
2869 |
return -EINTR; |
2870 |
idx = ccs_read_lock(); |
2871 |
/* Read a line and dispatch it to the policy handler. */ |
2872 |
while (avail_len > 0) { |
2873 |
char c; |
2874 |
if (head->w.avail >= head->writebuf_size - 1) { |
2875 |
const int len = head->writebuf_size * 2; |
2876 |
char *cp = kzalloc(len, CCS_GFP_FLAGS); |
2877 |
if (!cp) { |
2878 |
error = -ENOMEM; |
2879 |
break; |
2880 |
} |
2881 |
memmove(cp, cp0, head->w.avail); |
2882 |
kfree(cp0); |
2883 |
head->write_buf = cp; |
2884 |
cp0 = cp; |
2885 |
head->writebuf_size = len; |
2886 |
} |
2887 |
if (get_user(c, buffer)) { |
2888 |
error = -EFAULT; |
2889 |
break; |
2890 |
} |
2891 |
buffer++; |
2892 |
avail_len--; |
2893 |
cp0[head->w.avail++] = c; |
2894 |
if (c != '\n') |
2895 |
continue; |
2896 |
cp0[head->w.avail - 1] = '\0'; |
2897 |
head->w.avail = 0; |
2898 |
ccs_normalize_line(cp0); |
2899 |
if (!strcmp(cp0, "reset")) { |
2900 |
head->w.ns = head->original_ns; |
2901 |
head->w.domain = NULL; |
2902 |
memset(&head->r, 0, sizeof(head->r)); |
2903 |
continue; |
2904 |
} |
2905 |
/* Don't allow updating policies by non manager programs. */ |
2906 |
switch (head->type) { |
2907 |
case CCS_PROCESS_STATUS: |
2908 |
/* This does not write anything. */ |
2909 |
break; |
2910 |
case CCS_DOMAINPOLICY: |
2911 |
if (ccs_select_domain(head, cp0)) |
2912 |
continue; |
2913 |
/* fall through */ |
2914 |
case CCS_EXCEPTIONPOLICY: |
2915 |
if (!strcmp(cp0, "select transition_only")) { |
2916 |
head->r.print_transition_related_only = true; |
2917 |
continue; |
2918 |
} |
2919 |
/* fall through */ |
2920 |
default: |
2921 |
if (!ccs_manager()) { |
2922 |
error = -EPERM; |
2923 |
goto out; |
2924 |
} |
2925 |
} |
2926 |
/* Delete request? */ |
2927 |
head->w.is_delete = !strncmp(cp0, "delete ", 7); |
2928 |
if (head->w.is_delete) |
2929 |
memmove(cp0, cp0 + 7, strlen(cp0 + 7) + 1); |
2930 |
/* Selecting namespace to update. */ |
2931 |
if (head->type == CCS_EXCEPTIONPOLICY || |
2932 |
head->type == CCS_PROFILE) { |
2933 |
if (*cp0 == '<') { |
2934 |
char *cp = strchr(cp0, ' '); |
2935 |
if (cp) { |
2936 |
*cp++ = '\0'; |
2937 |
head->w.ns = ccs_assign_namespace(cp0); |
2938 |
memmove(cp0, cp, strlen(cp) + 1); |
2939 |
} else |
2940 |
head->w.ns = NULL; |
2941 |
} else |
2942 |
head->w.ns = head->original_ns; |
2943 |
/* Don't allow updating if namespace is invalid. */ |
2944 |
if (!head->w.ns) { |
2945 |
error = -ENOENT; |
2946 |
goto out; |
2947 |
} |
2948 |
} |
2949 |
{ |
2950 |
/* Do the update. */ |
2951 |
const int ret = head->write(head); |
2952 |
if (ret == -EPERM) { |
2953 |
error = -EPERM; |
2954 |
break; |
2955 |
} |
2956 |
/* Do not update statistics if not updated. */ |
2957 |
if (ret) |
2958 |
continue; |
2959 |
} |
2960 |
/* Update statistics. */ |
2961 |
switch (head->type) { |
2962 |
case CCS_DOMAINPOLICY: |
2963 |
case CCS_EXCEPTIONPOLICY: |
2964 |
case CCS_DOMAIN_STATUS: |
2965 |
case CCS_STAT: |
2966 |
case CCS_PROFILE: |
2967 |
case CCS_MANAGER: |
2968 |
ccs_update_stat(CCS_STAT_POLICY_UPDATES); |
2969 |
break; |
2970 |
default: |
2971 |
break; |
2972 |
} |
2973 |
} |
2974 |
out: |
2975 |
ccs_read_unlock(idx); |
2976 |
mutex_unlock(&head->io_sem); |
2977 |
return error; |
2978 |
} |
2979 |
|
2980 |
/** |
2981 |
* ccs_close_control - close() for /proc/ccs/ interface. |
2982 |
* |
2983 |
* @file: Pointer to "struct file". |
2984 |
* |
2985 |
* Returns 0. |
2986 |
*/ |
2987 |
int ccs_close_control(struct file *file) |
2988 |
{ |
2989 |
struct ccs_io_buffer *head = file->private_data; |
2990 |
file->private_data = NULL; |
2991 |
/* |
2992 |
* If the file is /proc/ccs/query, decrement the observer counter. |
2993 |
*/ |
2994 |
if (head->type == CCS_QUERY && |
2995 |
atomic_dec_and_test(&ccs_query_observers)) |
2996 |
wake_up_all(&ccs_answer_wait); |
2997 |
ccs_notify_gc(head, false); |
2998 |
return 0; |
2999 |
} |
3000 |
|
3001 |
/** |
3002 |
* ccs_policy_io_init - Register hooks for policy I/O. |
3003 |
* |
3004 |
* Returns nothing. |
3005 |
*/ |
3006 |
void __init ccs_policy_io_init(void) |
3007 |
{ |
3008 |
ccsecurity_ops.check_profile = ccs_check_profile; |
3009 |
} |
3010 |
|
3011 |
#ifdef CONFIG_CCSECURITY_USE_BUILTIN_POLICY |
3012 |
/** |
3013 |
* ccs_load_builtin_policy - Load built-in policy. |
3014 |
* |
3015 |
* Returns nothing. |
3016 |
*/ |
3017 |
void __init ccs_load_builtin_policy(void) |
3018 |
{ |
3019 |
/* |
3020 |
* This include file is manually created and contains built-in policy |
3021 |
* named "ccs_builtin_profile", "ccs_builtin_exception_policy", |
3022 |
* "ccs_builtin_domain_policy", "ccs_builtin_manager", |
3023 |
* "ccs_builtin_stat" in the form of "static char [] __initdata". |
3024 |
*/ |
3025 |
#include "builtin-policy.h" |
3026 |
struct ccs_io_buffer head; |
3027 |
u8 i; |
3028 |
const int idx = ccs_read_lock(); |
3029 |
for (i = 0; i < 5; i++) { |
3030 |
char *start = ""; |
3031 |
memset(&head, 0, sizeof(head)); |
3032 |
switch (i) { |
3033 |
case 0: |
3034 |
start = ccs_builtin_profile; |
3035 |
head.write = ccs_write_profile; |
3036 |
break; |
3037 |
case 1: |
3038 |
start = ccs_builtin_exception_policy; |
3039 |
head.write = ccs_write_exception; |
3040 |
break; |
3041 |
case 2: |
3042 |
start = ccs_builtin_domain_policy; |
3043 |
head.write = ccs_write_domain; |
3044 |
break; |
3045 |
case 3: |
3046 |
start = ccs_builtin_manager; |
3047 |
head.write = ccs_write_manager; |
3048 |
break; |
3049 |
case 4: |
3050 |
start = ccs_builtin_stat; |
3051 |
head.write = ccs_write_stat; |
3052 |
break; |
3053 |
} |
3054 |
while (1) { |
3055 |
char *end = strchr(start, '\n'); |
3056 |
if (!end) |
3057 |
break; |
3058 |
*end = '\0'; |
3059 |
ccs_normalize_line(start); |
3060 |
head.write_buf = start; |
3061 |
head.write(&head); |
3062 |
start = end + 1; |
3063 |
} |
3064 |
} |
3065 |
ccs_read_unlock(idx); |
3066 |
#ifdef CONFIG_CCSECURITY_ACTIVATE_FROM_THE_BEGINNING |
3067 |
ccs_check_profile(); |
3068 |
#endif |
3069 |
} |
3070 |
#endif |