10 |
* |
* |
11 |
*/ |
*/ |
12 |
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#include <linux/version.h> |
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) |
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#define __KERNEL_SYSCALLS__ |
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#endif |
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#include <linux/string.h> |
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#include <linux/mm.h> |
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#include <linux/utime.h> |
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#include <linux/file.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <asm/uaccess.h> |
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#include <stdarg.h> |
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
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#include <linux/namei.h> |
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#include <linux/mount.h> |
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static const int ccs_lookup_flags = LOOKUP_FOLLOW; |
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#else |
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static const int ccs_lookup_flags = LOOKUP_FOLLOW | LOOKUP_POSITIVE; |
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#endif |
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) |
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#include <linux/unistd.h> |
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#endif |
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13 |
#include "internal.h" |
#include "internal.h" |
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#include <linux/ccsecurity.h> |
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/* To support PID namespace. */ |
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) |
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#define find_task_by_pid find_task_by_vpid |
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#endif |
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/* Set default specified by the kernel config. */ |
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#define MAX_ACCEPT_ENTRY (CONFIG_CCSECURITY_MAX_ACCEPT_ENTRY) |
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#define MAX_GRANT_LOG (CONFIG_CCSECURITY_MAX_GRANT_LOG) |
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#define MAX_REJECT_LOG (CONFIG_CCSECURITY_MAX_REJECT_LOG) |
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14 |
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15 |
DEFINE_MUTEX(ccs_policy_lock); |
DEFINE_MUTEX(ccs_policy_lock); |
16 |
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17 |
/* Has /sbin/init started? */ |
/* Has /sbin/init started? */ |
18 |
bool ccs_policy_loaded; |
bool ccs_policy_loaded; |
19 |
|
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/* String table for functionality that takes 4 modes. */ |
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static const char *ccs_mode_4[4] = { |
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"disabled", "learning", "permissive", "enforcing" |
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}; |
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/* String table for functionality that takes 2 modes. */ |
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static const char *ccs_mode_2[4] = { |
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"disabled", "enabled", "enabled", "enabled" |
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}; |
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/* Table for profile. */ |
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static struct { |
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const char *keyword; |
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unsigned int current_value; |
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const unsigned int max_value; |
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} ccs_control_array[CCS_MAX_CONTROL_INDEX] = { |
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[CCS_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 }, |
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[CCS_MAC_FOR_IOCTL] = { "MAC_FOR_IOCTL", 0, 3 }, |
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[CCS_MAC_FOR_ARGV0] = { "MAC_FOR_ARGV0", 0, 3 }, |
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[CCS_MAC_FOR_ENV] = { "MAC_FOR_ENV", 0, 3 }, |
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[CCS_MAC_FOR_NETWORK] = { "MAC_FOR_NETWORK", 0, 3 }, |
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[CCS_MAC_FOR_SIGNAL] = { "MAC_FOR_SIGNAL", 0, 3 }, |
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[CCS_MAC_FOR_NAMESPACE] = { "MAC_FOR_NAMESPACE", 0, 3 }, |
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[CCS_RESTRICT_AUTOBIND] = { "RESTRICT_AUTOBIND", 0, 1 }, |
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[CCS_MAX_ACCEPT_ENTRY] |
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= { "MAX_ACCEPT_ENTRY", MAX_ACCEPT_ENTRY, INT_MAX }, |
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#ifdef CONFIG_CCSECURITY_AUDIT |
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[CCS_MAX_GRANT_LOG] |
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= { "MAX_GRANT_LOG", MAX_GRANT_LOG, INT_MAX }, |
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[CCS_MAX_REJECT_LOG] |
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= { "MAX_REJECT_LOG", MAX_REJECT_LOG, INT_MAX }, |
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#endif |
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[CCS_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 }, |
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[CCS_SLEEP_PERIOD] |
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= { "SLEEP_PERIOD", 0, 3000 }, /* in 0.1 second */ |
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}; |
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20 |
/* Capability name used by domain policy. */ |
/* Capability name used by domain policy. */ |
21 |
static const char *ccs_capability_control_keyword[CCS_MAX_CAPABILITY_INDEX] |
const char *ccs_capability_control_keyword[CCS_MAX_CAPABILITY_INDEX] |
22 |
= { |
= { |
23 |
[CCS_INET_STREAM_SOCKET_CREATE] = "inet_tcp_create", |
[CCS_INET_STREAM_SOCKET_CREATE] = "inet_tcp_create", |
24 |
[CCS_INET_STREAM_SOCKET_LISTEN] = "inet_tcp_listen", |
[CCS_INET_STREAM_SOCKET_LISTEN] = "inet_tcp_listen", |
54 |
[CCS_CONCEAL_MOUNT] = "conceal_mount", |
[CCS_CONCEAL_MOUNT] = "conceal_mount", |
55 |
}; |
}; |
56 |
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static bool ccs_profile_entry_used[CCS_MAX_CONTROL_INDEX + |
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CCS_MAX_CAPABILITY_INDEX + 1]; |
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57 |
/* Profile table. Memory is allocated as needed. */ |
/* Profile table. Memory is allocated as needed. */ |
58 |
static struct ccs_profile { |
struct ccs_profile *ccs_profile_ptr[MAX_PROFILES]; |
|
unsigned int value[CCS_MAX_CONTROL_INDEX]; |
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const struct ccs_path_info *comment; |
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unsigned char capability_value[CCS_MAX_CAPABILITY_INDEX]; |
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} *ccs_profile_ptr[MAX_PROFILES]; |
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/* Lock for protecting ccs_profile->comment */ |
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static DEFINE_SPINLOCK(ccs_profile_comment_lock); |
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/* Permit policy management by non-root user? */ |
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static bool ccs_manage_by_non_root; |
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59 |
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60 |
/* Utility functions. */ |
/* Utility functions. */ |
61 |
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62 |
/** |
/** |
|
* ccs_quiet_setup - Set CCS_VERBOSE=0 by default. |
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* |
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* @str: Unused. |
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* |
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* Returns 0. |
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*/ |
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static int __init ccs_quiet_setup(char *str) |
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|
{ |
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ccs_control_array[CCS_VERBOSE].current_value = 0; |
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return 0; |
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} |
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__setup("CCS_QUIET", ccs_quiet_setup); |
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/** |
|
63 |
* ccs_is_byte_range - Check whether the string isa \ooo style octal value. |
* ccs_is_byte_range - Check whether the string isa \ooo style octal value. |
64 |
* |
* |
65 |
* @str: Pointer to the string. |
* @str: Pointer to the string. |
136 |
* The @src is updated to point the first character after the @find |
* The @src is updated to point the first character after the @find |
137 |
* if @src starts with @find. |
* if @src starts with @find. |
138 |
*/ |
*/ |
139 |
static bool ccs_str_starts(char **src, const char *find) |
bool ccs_str_starts(char **src, const char *find) |
140 |
{ |
{ |
141 |
const int len = strlen(find); |
const int len = strlen(find); |
142 |
char *tmp = *src; |
char *tmp = *src; |
703 |
} |
} |
704 |
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705 |
/** |
/** |
|
* ccs_io_printf - Transactional printf() to "struct ccs_io_buffer" structure. |
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* |
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* @head: Pointer to "struct ccs_io_buffer". |
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* @fmt: The printf()'s format string, followed by parameters. |
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* |
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* Returns true on success, false otherwise. |
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* |
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* The snprintf() will truncate, but ccs_io_printf() won't. |
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*/ |
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bool ccs_io_printf(struct ccs_io_buffer *head, const char *fmt, ...) |
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{ |
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va_list args; |
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int len; |
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int pos = head->read_avail; |
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int size = head->readbuf_size - pos; |
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if (size <= 0) |
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return false; |
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va_start(args, fmt); |
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len = vsnprintf(head->read_buf + pos, size, fmt, args); |
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va_end(args); |
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if (pos + len >= head->readbuf_size) |
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return false; |
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head->read_avail += len; |
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|
return true; |
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|
} |
|
|
|
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/** |
|
706 |
* ccs_get_exe - Get ccs_realpath() of current process. |
* ccs_get_exe - Get ccs_realpath() of current process. |
707 |
* |
* |
708 |
* Returns the ccs_realpath() of current process on success, NULL otherwise. |
* Returns the ccs_realpath() of current process on success, NULL otherwise. |
948 |
} |
} |
949 |
return false; |
return false; |
950 |
} |
} |
|
|
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/** |
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* ccs_find_or_assign_new_profile - Create a new profile. |
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* |
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* @profile: Profile number to create. |
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* |
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* Returns pointer to "struct ccs_profile" on success, NULL otherwise. |
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*/ |
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static struct ccs_profile *ccs_find_or_assign_new_profile(const unsigned int |
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profile) |
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{ |
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struct ccs_profile *ptr; |
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struct ccs_profile *entry; |
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int i; |
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if (profile >= MAX_PROFILES) |
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return NULL; |
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ptr = ccs_profile_ptr[profile]; |
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if (ptr) |
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return ptr; |
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entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
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mutex_lock(&ccs_policy_lock); |
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ptr = ccs_profile_ptr[profile]; |
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if (!ptr && ccs_memory_ok(entry, sizeof(*entry))) { |
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ptr = entry; |
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for (i = 0; i < CCS_MAX_CONTROL_INDEX; i++) |
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ptr->value[i] = ccs_control_array[i].current_value; |
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/* |
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* Needn't to initialize "ptr->capability_value" |
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* because they are always 0. |
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*/ |
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mb(); /* Avoid out-of-order execution. */ |
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ccs_profile_ptr[profile] = ptr; |
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entry = NULL; |
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} |
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mutex_unlock(&ccs_policy_lock); |
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kfree(entry); |
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return ptr; |
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} |
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/** |
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* ccs_write_profile - Write profile table. |
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* |
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* @head: Pointer to "struct ccs_io_buffer". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int ccs_write_profile(struct ccs_io_buffer *head) |
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{ |
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char *data = head->write_buf; |
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unsigned int i; |
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unsigned int value; |
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|
char *cp; |
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struct ccs_profile *ccs_profile; |
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i = simple_strtoul(data, &cp, 10); |
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if (data != cp) { |
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if (*cp != '-') |
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return -EINVAL; |
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data = cp + 1; |
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} |
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ccs_profile = ccs_find_or_assign_new_profile(i); |
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if (!ccs_profile) |
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return -EINVAL; |
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|
cp = strchr(data, '='); |
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|
if (!cp) |
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|
return -EINVAL; |
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|
*cp = '\0'; |
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|
if (!strcmp(data, "COMMENT")) { |
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|
const struct ccs_path_info *new_comment |
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= ccs_get_name(cp + 1); |
|
|
const struct ccs_path_info *old_comment; |
|
|
/* Protect reader from ccs_put_name(). */ |
|
|
/***** CRITICAL SECTION START *****/ |
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|
spin_lock(&ccs_profile_comment_lock); |
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old_comment = ccs_profile->comment; |
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|
ccs_profile->comment = new_comment; |
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spin_unlock(&ccs_profile_comment_lock); |
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|
/***** CRITICAL SECTION END *****/ |
|
|
ccs_put_name(old_comment); |
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|
ccs_profile_entry_used[0] = true; |
|
|
return 0; |
|
|
} |
|
|
if (ccs_str_starts(&data, KEYWORD_MAC_FOR_CAPABILITY)) { |
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|
if (sscanf(cp + 1, "%u", &value) != 1) { |
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|
for (i = 0; i < 4; i++) { |
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|
if (strcmp(cp + 1, ccs_mode_4[i])) |
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|
continue; |
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|
value = i; |
|
|
break; |
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} |
|
|
if (i == 4) |
|
|
return -EINVAL; |
|
|
} |
|
|
if (value > 3) |
|
|
value = 3; |
|
|
for (i = 0; i < CCS_MAX_CAPABILITY_INDEX; i++) { |
|
|
if (strcmp(data, ccs_capability_control_keyword[i])) |
|
|
continue; |
|
|
ccs_profile->capability_value[i] = value; |
|
|
ccs_profile_entry_used[i + 1 + CCS_MAX_CONTROL_INDEX] |
|
|
= true; |
|
|
return 0; |
|
|
} |
|
|
return -EINVAL; |
|
|
} |
|
|
for (i = 0; i < CCS_MAX_CONTROL_INDEX; i++) { |
|
|
if (strcmp(data, ccs_control_array[i].keyword)) |
|
|
continue; |
|
|
if (sscanf(cp + 1, "%u", &value) != 1) { |
|
|
int j; |
|
|
const char **modes; |
|
|
switch (i) { |
|
|
case CCS_RESTRICT_AUTOBIND: |
|
|
case CCS_VERBOSE: |
|
|
modes = ccs_mode_2; |
|
|
break; |
|
|
default: |
|
|
modes = ccs_mode_4; |
|
|
break; |
|
|
} |
|
|
for (j = 0; j < 4; j++) { |
|
|
if (strcmp(cp + 1, modes[j])) |
|
|
continue; |
|
|
value = j; |
|
|
break; |
|
|
} |
|
|
if (j == 4) |
|
|
return -EINVAL; |
|
|
} else if (value > ccs_control_array[i].max_value) { |
|
|
value = ccs_control_array[i].max_value; |
|
|
} |
|
|
ccs_profile->value[i] = value; |
|
|
ccs_profile_entry_used[i + 1] = true; |
|
|
return 0; |
|
|
} |
|
|
return -EINVAL; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_read_profile - Read profile table. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns 0. |
|
|
*/ |
|
|
static int ccs_read_profile(struct ccs_io_buffer *head) |
|
|
{ |
|
|
static const int ccs_total |
|
|
= CCS_MAX_CONTROL_INDEX + CCS_MAX_CAPABILITY_INDEX + 1; |
|
|
int step; |
|
|
if (head->read_eof) |
|
|
return 0; |
|
|
for (step = head->read_step; step < MAX_PROFILES * ccs_total; step++) { |
|
|
const u8 index = step / ccs_total; |
|
|
u8 type = step % ccs_total; |
|
|
const struct ccs_profile *ccs_profile = ccs_profile_ptr[index]; |
|
|
head->read_step = step; |
|
|
if (!ccs_profile) |
|
|
continue; |
|
|
if (!ccs_profile_entry_used[type]) |
|
|
continue; |
|
|
if (!type) { /* Print profile' comment tag. */ |
|
|
bool done; |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
spin_lock(&ccs_profile_comment_lock); |
|
|
done = ccs_io_printf(head, "%u-COMMENT=%s\n", |
|
|
index, ccs_profile->comment ? |
|
|
ccs_profile->comment->name : ""); |
|
|
spin_unlock(&ccs_profile_comment_lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
if (!done) |
|
|
break; |
|
|
continue; |
|
|
} |
|
|
type--; |
|
|
if (type >= CCS_MAX_CONTROL_INDEX) { |
|
|
const int i = type - CCS_MAX_CONTROL_INDEX; |
|
|
const u8 value = ccs_profile->capability_value[i]; |
|
|
if (!ccs_io_printf(head, |
|
|
"%u-" KEYWORD_MAC_FOR_CAPABILITY |
|
|
"%s=%s\n", index, |
|
|
ccs_capability_control_keyword[i], |
|
|
ccs_mode_4[value])) |
|
|
break; |
|
|
} else { |
|
|
const unsigned int value = ccs_profile->value[type]; |
|
|
const char **modes = NULL; |
|
|
const char *keyword = ccs_control_array[type].keyword; |
|
|
switch (ccs_control_array[type].max_value) { |
|
|
case 3: |
|
|
modes = ccs_mode_4; |
|
|
break; |
|
|
case 1: |
|
|
modes = ccs_mode_2; |
|
|
break; |
|
|
} |
|
|
if (modes) { |
|
|
if (!ccs_io_printf(head, "%u-%s=%s\n", index, |
|
|
keyword, modes[value])) |
|
|
break; |
|
|
} else { |
|
|
if (!ccs_io_printf(head, "%u-%s=%u\n", index, |
|
|
keyword, value)) |
|
|
break; |
|
|
} |
|
|
} |
|
|
} |
|
|
if (step == MAX_PROFILES * ccs_total) |
|
|
head->read_eof = true; |
|
|
return 0; |
|
|
} |
|
|
|
|
|
/* The list for "struct ccs_policy_manager_entry". */ |
|
|
LIST_HEAD(ccs_policy_manager_list); |
|
|
|
|
|
/** |
|
|
* ccs_update_manager_entry - Add a manager entry. |
|
|
* |
|
|
* @manager: The path to manager or the domainnamme. |
|
|
* @is_delete: True if it is a delete request. |
|
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
static int ccs_update_manager_entry(const char *manager, const bool is_delete) |
|
|
{ |
|
|
struct ccs_policy_manager_entry *entry = NULL; |
|
|
struct ccs_policy_manager_entry *ptr; |
|
|
const struct ccs_path_info *saved_manager; |
|
|
int error = is_delete ? -ENOENT : -ENOMEM; |
|
|
bool is_domain = false; |
|
|
if (ccs_is_domain_def(manager)) { |
|
|
if (!ccs_is_correct_domain(manager)) |
|
|
return -EINVAL; |
|
|
is_domain = true; |
|
|
} else { |
|
|
if (!ccs_is_correct_path(manager, 1, -1, -1)) |
|
|
return -EINVAL; |
|
|
} |
|
|
saved_manager = ccs_get_name(manager); |
|
|
if (!saved_manager) |
|
|
return -ENOMEM; |
|
|
if (!is_delete) |
|
|
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
|
|
mutex_lock(&ccs_policy_lock); |
|
|
list_for_each_entry_rcu(ptr, &ccs_policy_manager_list, list) { |
|
|
if (ptr->manager != saved_manager) |
|
|
continue; |
|
|
ptr->is_deleted = is_delete; |
|
|
error = 0; |
|
|
break; |
|
|
} |
|
|
if (!is_delete && error && ccs_memory_ok(entry, sizeof(*entry))) { |
|
|
entry->manager = saved_manager; |
|
|
saved_manager = NULL; |
|
|
entry->is_domain = is_domain; |
|
|
list_add_tail_rcu(&entry->list, &ccs_policy_manager_list); |
|
|
entry = NULL; |
|
|
error = 0; |
|
|
} |
|
|
mutex_unlock(&ccs_policy_lock); |
|
|
ccs_put_name(saved_manager); |
|
|
kfree(entry); |
|
|
return error; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_write_manager_policy - Write manager policy. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
static int ccs_write_manager_policy(struct ccs_io_buffer *head) |
|
|
{ |
|
|
char *data = head->write_buf; |
|
|
bool is_delete = ccs_str_starts(&data, KEYWORD_DELETE); |
|
|
if (!strcmp(data, "manage_by_non_root")) { |
|
|
ccs_manage_by_non_root = !is_delete; |
|
|
return 0; |
|
|
} |
|
|
return ccs_update_manager_entry(data, is_delete); |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_read_manager_policy - Read manager policy. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns 0. |
|
|
* |
|
|
* Caller holds ccs_read_lock(). |
|
|
*/ |
|
|
static int ccs_read_manager_policy(struct ccs_io_buffer *head) |
|
|
{ |
|
|
struct list_head *pos; |
|
|
ccs_check_read_lock(); |
|
|
if (head->read_eof) |
|
|
return 0; |
|
|
list_for_each_cookie(pos, head->read_var2, &ccs_policy_manager_list) { |
|
|
struct ccs_policy_manager_entry *ptr; |
|
|
ptr = list_entry(pos, struct ccs_policy_manager_entry, list); |
|
|
if (ptr->is_deleted) |
|
|
continue; |
|
|
if (!ccs_io_printf(head, "%s\n", ptr->manager->name)) |
|
|
return 0; |
|
|
} |
|
|
head->read_eof = true; |
|
|
return 0; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_is_policy_manager - Check whether the current process is a policy manager. |
|
|
* |
|
|
* Returns true if the current process is permitted to modify policy |
|
|
* via /proc/ccs/ interface. |
|
|
* |
|
|
* Caller holds ccs_read_lock(). |
|
|
*/ |
|
|
static bool ccs_is_policy_manager(void) |
|
|
{ |
|
|
struct ccs_policy_manager_entry *ptr; |
|
|
const char *exe; |
|
|
struct task_struct *task = current; |
|
|
const struct ccs_path_info *domainname |
|
|
= ccs_current_domain()->domainname; |
|
|
bool found = false; |
|
|
ccs_check_read_lock(); |
|
|
if (!ccs_policy_loaded) |
|
|
return true; |
|
|
if (task->ccs_flags & CCS_TASK_IS_POLICY_MANAGER) |
|
|
return true; |
|
|
if (!ccs_manage_by_non_root && (current_uid() || current_euid())) |
|
|
return false; |
|
|
list_for_each_entry_rcu(ptr, &ccs_policy_manager_list, list) { |
|
|
if (!ptr->is_deleted && ptr->is_domain |
|
|
&& !ccs_pathcmp(domainname, ptr->manager)) { |
|
|
/* Set manager flag. */ |
|
|
task->ccs_flags |= CCS_TASK_IS_POLICY_MANAGER; |
|
|
return true; |
|
|
} |
|
|
} |
|
|
exe = ccs_get_exe(); |
|
|
if (!exe) |
|
|
return false; |
|
|
list_for_each_entry_rcu(ptr, &ccs_policy_manager_list, list) { |
|
|
if (!ptr->is_deleted && !ptr->is_domain |
|
|
&& !strcmp(exe, ptr->manager->name)) { |
|
|
found = true; |
|
|
/* Set manager flag. */ |
|
|
task->ccs_flags |= CCS_TASK_IS_POLICY_MANAGER; |
|
|
break; |
|
|
} |
|
|
} |
|
|
if (!found) { /* Reduce error messages. */ |
|
|
static pid_t ccs_last_pid; |
|
|
const pid_t pid = current->pid; |
|
|
if (ccs_last_pid != pid) { |
|
|
printk(KERN_WARNING "%s ( %s ) is not permitted to " |
|
|
"update policies.\n", domainname->name, exe); |
|
|
ccs_last_pid = pid; |
|
|
} |
|
|
} |
|
|
kfree(exe); |
|
|
return found; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_find_condition_part - Find condition part from the statement. |
|
|
* |
|
|
* @data: String to parse. |
|
|
* |
|
|
* Returns pointer to the condition part if it was found in the statement, |
|
|
* NULL otherwise. |
|
|
*/ |
|
|
static char *ccs_find_condition_part(char *data) |
|
|
{ |
|
|
char *cp = strstr(data, " if "); |
|
|
if (cp) { |
|
|
while (1) { |
|
|
char *cp2 = strstr(cp + 3, " if "); |
|
|
if (!cp2) |
|
|
break; |
|
|
cp = cp2; |
|
|
} |
|
|
*cp++ = '\0'; |
|
|
} else { |
|
|
cp = strstr(data, " ; set "); |
|
|
if (cp) |
|
|
*cp++ = '\0'; |
|
|
} |
|
|
return cp; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_is_select_one - Parse select command. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @data: String to parse. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
* |
|
|
* Caller holds ccs_read_lock(). |
|
|
*/ |
|
|
static bool ccs_is_select_one(struct ccs_io_buffer *head, const char *data) |
|
|
{ |
|
|
unsigned int pid; |
|
|
struct ccs_domain_info *domain = NULL; |
|
|
ccs_check_read_lock(); |
|
|
if (!strcmp(data, "allow_execute")) { |
|
|
head->read_execute_only = true; |
|
|
return true; |
|
|
} |
|
|
if (sscanf(data, "pid=%u", &pid) == 1) { |
|
|
struct task_struct *p; |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
read_lock(&tasklist_lock); |
|
|
p = find_task_by_pid(pid); |
|
|
if (p) |
|
|
domain = ccs_task_domain(p); |
|
|
read_unlock(&tasklist_lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
} else if (!strncmp(data, "domain=", 7)) { |
|
|
if (ccs_is_domain_def(data + 7)) |
|
|
domain = ccs_find_domain(data + 7); |
|
|
} else |
|
|
return false; |
|
|
head->write_var1 = domain; |
|
|
/* Accessing read_buf is safe because head->io_sem is held. */ |
|
|
if (!head->read_buf) |
|
|
return true; /* Do nothing if open(O_WRONLY). */ |
|
|
head->read_avail = 0; |
|
|
ccs_io_printf(head, "# select %s\n", data); |
|
|
head->read_single_domain = true; |
|
|
head->read_eof = !domain; |
|
|
if (domain) { |
|
|
struct ccs_domain_info *d; |
|
|
head->read_var1 = NULL; |
|
|
list_for_each_entry_rcu(d, &ccs_domain_list, list) { |
|
|
if (d == domain) |
|
|
break; |
|
|
head->read_var1 = &d->list; |
|
|
} |
|
|
head->read_var2 = NULL; |
|
|
head->read_bit = 0; |
|
|
head->read_step = 0; |
|
|
if (domain->is_deleted) |
|
|
ccs_io_printf(head, "# This is a deleted domain.\n"); |
|
|
} |
|
|
return true; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_write_domain_policy - Write domain policy. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
static int ccs_write_domain_policy(struct ccs_io_buffer *head) |
|
|
{ |
|
|
char *data = head->write_buf; |
|
|
struct ccs_domain_info *domain = head->write_var1; |
|
|
bool is_delete = false; |
|
|
bool is_select = false; |
|
|
unsigned int profile; |
|
|
struct ccs_condition *cond = NULL; |
|
|
char *cp; |
|
|
int error; |
|
|
if (ccs_str_starts(&data, KEYWORD_DELETE)) |
|
|
is_delete = true; |
|
|
else if (ccs_str_starts(&data, KEYWORD_SELECT)) |
|
|
is_select = true; |
|
|
if (is_select && ccs_is_select_one(head, data)) |
|
|
return 0; |
|
|
/* Don't allow updating policies by non manager programs. */ |
|
|
if (!ccs_is_policy_manager()) |
|
|
return -EPERM; |
|
|
if (ccs_is_domain_def(data)) { |
|
|
domain = NULL; |
|
|
if (is_delete) |
|
|
ccs_delete_domain(data); |
|
|
else if (is_select) |
|
|
domain = ccs_find_domain(data); |
|
|
else |
|
|
domain = ccs_find_or_assign_new_domain(data, 0); |
|
|
head->write_var1 = domain; |
|
|
return 0; |
|
|
} |
|
|
if (!domain) |
|
|
return -EINVAL; |
|
|
|
|
|
if (sscanf(data, KEYWORD_USE_PROFILE "%u", &profile) == 1 |
|
|
&& profile < MAX_PROFILES) { |
|
|
if (ccs_profile_ptr[profile] || !ccs_policy_loaded) |
|
|
domain->profile = (u8) profile; |
|
|
return 0; |
|
|
} |
|
|
if (!strcmp(data, KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { |
|
|
domain->ignore_global_allow_read = !is_delete; |
|
|
return 0; |
|
|
} |
|
|
if (!strcmp(data, KEYWORD_IGNORE_GLOBAL_ALLOW_ENV)) { |
|
|
domain->ignore_global_allow_env = !is_delete; |
|
|
return 0; |
|
|
} |
|
|
cp = ccs_find_condition_part(data); |
|
|
if (cp) { |
|
|
cond = ccs_get_condition(cp); |
|
|
if (!cond) |
|
|
return -EINVAL; |
|
|
} |
|
|
if (ccs_str_starts(&data, KEYWORD_ALLOW_CAPABILITY)) |
|
|
error = ccs_write_capability_policy(data, domain, cond, |
|
|
is_delete); |
|
|
else if (ccs_str_starts(&data, KEYWORD_ALLOW_NETWORK)) |
|
|
error = ccs_write_network_policy(data, domain, cond, is_delete); |
|
|
else if (ccs_str_starts(&data, KEYWORD_ALLOW_SIGNAL)) |
|
|
error = ccs_write_signal_policy(data, domain, cond, is_delete); |
|
|
else if (ccs_str_starts(&data, KEYWORD_ALLOW_ARGV0)) |
|
|
error = ccs_write_argv0_policy(data, domain, cond, is_delete); |
|
|
else if (ccs_str_starts(&data, KEYWORD_ALLOW_ENV)) |
|
|
error = ccs_write_env_policy(data, domain, cond, is_delete); |
|
|
else if (ccs_str_starts(&data, KEYWORD_ALLOW_IOCTL)) |
|
|
error = ccs_write_ioctl_policy(data, domain, cond, is_delete); |
|
|
else if (ccs_str_starts(&data, KEYWORD_ALLOW_MOUNT)) |
|
|
error = ccs_write_mount_policy(data, domain, cond, is_delete); |
|
|
else if (ccs_str_starts(&data, KEYWORD_ALLOW_UNMOUNT)) |
|
|
error = ccs_write_umount_policy(data, domain, cond, is_delete); |
|
|
else if (ccs_str_starts(&data, KEYWORD_ALLOW_CHROOT)) |
|
|
error = ccs_write_chroot_policy(data, domain, cond, is_delete); |
|
|
else if (ccs_str_starts(&data, KEYWORD_ALLOW_PIVOT_ROOT)) |
|
|
error = ccs_write_pivot_root_policy(data, domain, cond, |
|
|
is_delete); |
|
|
else |
|
|
error = ccs_write_file_policy(data, domain, cond, is_delete); |
|
|
if (cond) |
|
|
ccs_put_condition(cond); |
|
|
return error; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_single_path_acl - Print a single path ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct ccs_single_path_acl_record". |
|
|
* @cond: Pointer to "struct ccs_condition". May be NULL. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_single_path_acl(struct ccs_io_buffer *head, |
|
|
struct ccs_single_path_acl_record *ptr, |
|
|
const struct ccs_condition *cond) |
|
|
{ |
|
|
int pos; |
|
|
u8 bit; |
|
|
const char *atmark = ""; |
|
|
const char *filename; |
|
|
const u16 perm = ptr->perm; |
|
|
if (ptr->u_is_group) { |
|
|
atmark = "@"; |
|
|
filename = ptr->u.group->group_name->name; |
|
|
} else { |
|
|
filename = ptr->u.filename->name; |
|
|
} |
|
|
for (bit = head->read_bit; bit < MAX_SINGLE_PATH_OPERATION; bit++) { |
|
|
const char *msg; |
|
|
if (!(perm & (1 << bit))) |
|
|
continue; |
|
|
if (head->read_execute_only && bit != TYPE_EXECUTE_ACL) |
|
|
continue; |
|
|
/* Print "read/write" instead of "read" and "write". */ |
|
|
if ((bit == TYPE_READ_ACL || bit == TYPE_WRITE_ACL) |
|
|
&& (perm & (1 << TYPE_READ_WRITE_ACL))) |
|
|
continue; |
|
|
msg = ccs_sp2keyword(bit); |
|
|
pos = head->read_avail; |
|
|
if (!ccs_io_printf(head, "allow_%s %s%s", msg, |
|
|
atmark, filename) || |
|
|
!ccs_print_condition(head, cond)) |
|
|
goto out; |
|
|
} |
|
|
head->read_bit = 0; |
|
|
return true; |
|
|
out: |
|
|
head->read_bit = bit; |
|
|
head->read_avail = pos; |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_mkdev_acl - Print a mkdev ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct ccs_mkdev_acl_record". |
|
|
* @cond: Pointer to "struct ccs_condition". May be NULL. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_mkdev_acl(struct ccs_io_buffer *head, |
|
|
struct ccs_mkdev_acl_record *ptr, |
|
|
const struct ccs_condition *cond) |
|
|
{ |
|
|
int pos; |
|
|
u8 bit; |
|
|
const char *atmark = ""; |
|
|
const char *filename; |
|
|
const u16 perm = ptr->perm; |
|
|
if (ptr->u_is_group) { |
|
|
atmark = "@"; |
|
|
filename = ptr->u.group->group_name->name; |
|
|
} else { |
|
|
filename = ptr->u.filename->name; |
|
|
} |
|
|
for (bit = head->read_bit; bit < MAX_MKDEV_OPERATION; bit++) { |
|
|
const char *msg; |
|
|
const unsigned int min_major = ptr->min_major; |
|
|
const unsigned int max_major = ptr->max_major; |
|
|
const unsigned int min_minor = ptr->min_minor; |
|
|
const unsigned int max_minor = ptr->max_minor; |
|
|
if (!(perm & (1 << bit))) |
|
|
continue; |
|
|
msg = ccs_mkdev2keyword(bit); |
|
|
pos = head->read_avail; |
|
|
if (!ccs_io_printf(head, "allow_%s %s%s %u", msg, atmark, |
|
|
filename, min_major) || |
|
|
(min_major != max_major && |
|
|
!ccs_io_printf(head, "-%u", max_major)) || |
|
|
!ccs_io_printf(head, " %u", min_minor) || |
|
|
(min_minor != max_minor && |
|
|
!ccs_io_printf(head, "-%u", max_minor)) || |
|
|
!ccs_print_condition(head, cond)) |
|
|
goto out; |
|
|
} |
|
|
head->read_bit = 0; |
|
|
return true; |
|
|
out: |
|
|
head->read_bit = bit; |
|
|
head->read_avail = pos; |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_double_path_acl - Print a double path ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct ccs_double_path_acl_record". |
|
|
* @cond: Pointer to "struct ccs_condition". May be NULL. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_double_path_acl(struct ccs_io_buffer *head, |
|
|
struct ccs_double_path_acl_record *ptr, |
|
|
const struct ccs_condition *cond) |
|
|
{ |
|
|
int pos; |
|
|
const char *atmark1 = ""; |
|
|
const char *atmark2 = ""; |
|
|
const char *filename1; |
|
|
const char *filename2; |
|
|
const u8 perm = ptr->perm; |
|
|
u8 bit; |
|
|
if (ptr->u1_is_group) { |
|
|
atmark1 = "@"; |
|
|
filename1 = ptr->u1.group1->group_name->name; |
|
|
} else { |
|
|
filename1 = ptr->u1.filename1->name; |
|
|
} |
|
|
if (ptr->u2_is_group) { |
|
|
atmark2 = "@"; |
|
|
filename2 = ptr->u2.group2->group_name->name; |
|
|
} else { |
|
|
filename2 = ptr->u2.filename2->name; |
|
|
} |
|
|
for (bit = head->read_bit; bit < MAX_DOUBLE_PATH_OPERATION; bit++) { |
|
|
const char *msg; |
|
|
if (!(perm & (1 << bit))) |
|
|
continue; |
|
|
msg = ccs_dp2keyword(bit); |
|
|
pos = head->read_avail; |
|
|
if (!ccs_io_printf(head, "allow_%s %s%s %s%s", msg, |
|
|
atmark1, filename1, atmark2, filename2) || |
|
|
!ccs_print_condition(head, cond)) |
|
|
goto out; |
|
|
} |
|
|
head->read_bit = 0; |
|
|
return true; |
|
|
out: |
|
|
head->read_bit = bit; |
|
|
head->read_avail = pos; |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_ioctl_acl - Print an ioctl ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct ccs_ioctl_acl_record". |
|
|
* @cond: Pointer to "struct ccs_condition". May be NULL. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_ioctl_acl(struct ccs_io_buffer *head, |
|
|
struct ccs_ioctl_acl_record *ptr, |
|
|
const struct ccs_condition *cond) |
|
|
{ |
|
|
int pos = head->read_avail; |
|
|
const char *atmark = ""; |
|
|
const char *filename; |
|
|
const unsigned int cmd_min = ptr->cmd_min; |
|
|
const unsigned int cmd_max = ptr->cmd_max; |
|
|
if (ptr->u_is_group) { |
|
|
atmark = "@"; |
|
|
filename = ptr->u.group->group_name->name; |
|
|
} else { |
|
|
filename = ptr->u.filename->name; |
|
|
} |
|
|
if (!ccs_io_printf(head, KEYWORD_ALLOW_IOCTL "%s%s ", atmark, filename)) |
|
|
goto out; |
|
|
if (!ccs_io_printf(head, "%u", cmd_min)) |
|
|
goto out; |
|
|
if (cmd_min != cmd_max && !ccs_io_printf(head, "-%u", cmd_max)) |
|
|
goto out; |
|
|
if (!ccs_print_condition(head, cond)) |
|
|
goto out; |
|
|
return true; |
|
|
out: |
|
|
head->read_avail = pos; |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_argv0_acl - Print an argv[0] ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct ccs_argv0_acl_record". |
|
|
* @cond: Pointer to "struct ccs_condition". May be NULL. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_argv0_acl(struct ccs_io_buffer *head, |
|
|
struct ccs_argv0_acl_record *ptr, |
|
|
const struct ccs_condition *cond) |
|
|
{ |
|
|
int pos = head->read_avail; |
|
|
if (!ccs_io_printf(head, KEYWORD_ALLOW_ARGV0 "%s %s", |
|
|
ptr->filename->name, ptr->argv0->name)) |
|
|
goto out; |
|
|
if (!ccs_print_condition(head, cond)) |
|
|
goto out; |
|
|
return true; |
|
|
out: |
|
|
head->read_avail = pos; |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_env_acl - Print an evironment variable name's ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct ccs_env_acl_record". |
|
|
* @cond: Pointer to "struct ccs_condition". May be NULL. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_env_acl(struct ccs_io_buffer *head, |
|
|
struct ccs_env_acl_record *ptr, |
|
|
const struct ccs_condition *cond) |
|
|
{ |
|
|
int pos = head->read_avail; |
|
|
if (!ccs_io_printf(head, KEYWORD_ALLOW_ENV "%s", ptr->env->name)) |
|
|
goto out; |
|
|
if (!ccs_print_condition(head, cond)) |
|
|
goto out; |
|
|
return true; |
|
|
out: |
|
|
head->read_avail = pos; |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_capability_acl - Print a capability ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct ccs_capability_acl_record". |
|
|
* @cond: Pointer to "struct ccs_condition". May be NULL. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_capability_acl(struct ccs_io_buffer *head, |
|
|
struct ccs_capability_acl_record *ptr, |
|
|
const struct ccs_condition *cond) |
|
|
{ |
|
|
int pos = head->read_avail; |
|
|
if (!ccs_io_printf(head, KEYWORD_ALLOW_CAPABILITY "%s", |
|
|
ccs_cap2keyword(ptr->operation))) |
|
|
goto out; |
|
|
if (!ccs_print_condition(head, cond)) |
|
|
goto out; |
|
|
return true; |
|
|
out: |
|
|
head->read_avail = pos; |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_ipv4_entry - Print IPv4 address of a network ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct ccs_ip_network_acl_record". |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_ipv4_entry(struct ccs_io_buffer *head, |
|
|
struct ccs_ip_network_acl_record *ptr) |
|
|
{ |
|
|
const u32 min_address = ptr->u.ipv4.min; |
|
|
const u32 max_address = ptr->u.ipv4.max; |
|
|
if (!ccs_io_printf(head, "%u.%u.%u.%u", HIPQUAD(min_address))) |
|
|
return false; |
|
|
if (min_address != max_address |
|
|
&& !ccs_io_printf(head, "-%u.%u.%u.%u", HIPQUAD(max_address))) |
|
|
return false; |
|
|
return true; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_ipv6_entry - Print IPv6 address of a network ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct ccs_ip_network_acl_record". |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_ipv6_entry(struct ccs_io_buffer *head, |
|
|
struct ccs_ip_network_acl_record *ptr) |
|
|
{ |
|
|
char buf[64]; |
|
|
const struct in6_addr *min_address = ptr->u.ipv6.min; |
|
|
const struct in6_addr *max_address = ptr->u.ipv6.max; |
|
|
ccs_print_ipv6(buf, sizeof(buf), min_address); |
|
|
if (!ccs_io_printf(head, "%s", buf)) |
|
|
return false; |
|
|
if (min_address != max_address) { |
|
|
ccs_print_ipv6(buf, sizeof(buf), max_address); |
|
|
if (!ccs_io_printf(head, "-%s", buf)) |
|
|
return false; |
|
|
} |
|
|
return true; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_port_entry - Print port number of a network ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct ccs_ip_network_acl_record". |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_port_entry(struct ccs_io_buffer *head, |
|
|
struct ccs_ip_network_acl_record *ptr) |
|
|
{ |
|
|
const u16 min_port = ptr->min_port; |
|
|
const u16 max_port = ptr->max_port; |
|
|
if (!ccs_io_printf(head, " %u", min_port)) |
|
|
return false; |
|
|
if (min_port != max_port && !ccs_io_printf(head, "-%u", max_port)) |
|
|
return false; |
|
|
return true; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_network_acl - Print a network ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct ccs_ip_network_acl_record". |
|
|
* @cond: Pointer to "struct ccs_condition". May be NULL. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_network_acl(struct ccs_io_buffer *head, |
|
|
struct ccs_ip_network_acl_record *ptr, |
|
|
const struct ccs_condition *cond) |
|
|
{ |
|
|
int pos = head->read_avail; |
|
|
if (!ccs_io_printf(head, KEYWORD_ALLOW_NETWORK "%s ", |
|
|
ccs_net2keyword(ptr->operation_type))) |
|
|
goto out; |
|
|
switch (ptr->record_type) { |
|
|
case IP_RECORD_TYPE_ADDRESS_GROUP: |
|
|
if (!ccs_io_printf(head, "@%s", ptr->u.group->group_name->name)) |
|
|
goto out; |
|
|
break; |
|
|
case IP_RECORD_TYPE_IPv4: |
|
|
if (!ccs_print_ipv4_entry(head, ptr)) |
|
|
goto out; |
|
|
break; |
|
|
case IP_RECORD_TYPE_IPv6: |
|
|
if (!ccs_print_ipv6_entry(head, ptr)) |
|
|
goto out; |
|
|
break; |
|
|
} |
|
|
if (!ccs_print_port_entry(head, ptr)) |
|
|
goto out; |
|
|
if (!ccs_print_condition(head, cond)) |
|
|
goto out; |
|
|
return true; |
|
|
out: |
|
|
head->read_avail = pos; |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_signal_acl - Print a signal ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct signale_acl_record". |
|
|
* @cond: Pointer to "struct ccs_condition". May be NULL. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_signal_acl(struct ccs_io_buffer *head, |
|
|
struct ccs_signal_acl_record *ptr, |
|
|
const struct ccs_condition *cond) |
|
|
{ |
|
|
int pos = head->read_avail; |
|
|
if (!ccs_io_printf(head, KEYWORD_ALLOW_SIGNAL "%u %s", |
|
|
ptr->sig, ptr->domainname->name)) |
|
|
goto out; |
|
|
if (!ccs_print_condition(head, cond)) |
|
|
goto out; |
|
|
return true; |
|
|
out: |
|
|
head->read_avail = pos; |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_execute_handler_record - Print an execute handler ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @keyword: Name of the keyword. |
|
|
* @ptr: Pointer to "struct ccs_execute_handler_record". |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_execute_handler_record(struct ccs_io_buffer *head, |
|
|
const char *keyword, |
|
|
struct ccs_execute_handler_record * |
|
|
ptr) |
|
|
{ |
|
|
return ccs_io_printf(head, "%s %s\n", keyword, ptr->handler->name); |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_mount_acl - Print a mount ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct ccs_mount_acl_record". |
|
|
* @cond: Pointer to "struct ccs_condition". May be NULL. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_mount_acl(struct ccs_io_buffer *head, |
|
|
struct ccs_mount_acl_record *ptr, |
|
|
const struct ccs_condition *cond) |
|
|
{ |
|
|
int pos = head->read_avail; |
|
|
if (!ccs_io_printf(head, KEYWORD_ALLOW_MOUNT "%s %s %s 0x%lX\n", |
|
|
ptr->dev_name->name, ptr->dir_name->name, |
|
|
ptr->fs_type->name, ptr->flags)) |
|
|
goto out; |
|
|
if (!ccs_print_condition(head, cond)) |
|
|
goto out; |
|
|
return true; |
|
|
out: |
|
|
head->read_avail = pos; |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_umount_acl - Print a mount ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct ccs_umount_acl_record". |
|
|
* @cond: Pointer to "struct ccs_condition". May be NULL. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_umount_acl(struct ccs_io_buffer *head, |
|
|
struct ccs_umount_acl_record *ptr, |
|
|
const struct ccs_condition *cond) |
|
|
{ |
|
|
int pos = head->read_avail; |
|
|
if (!ccs_io_printf(head, KEYWORD_ALLOW_UNMOUNT "%s\n", |
|
|
ptr->dir->name)) |
|
|
goto out; |
|
|
if (!ccs_print_condition(head, cond)) |
|
|
goto out; |
|
|
return true; |
|
|
out: |
|
|
head->read_avail = pos; |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_chroot_acl - Print a chroot ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct ccs_chroot_acl_record". |
|
|
* @cond: Pointer to "struct ccs_condition". May be NULL. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_chroot_acl(struct ccs_io_buffer *head, |
|
|
struct ccs_chroot_acl_record *ptr, |
|
|
const struct ccs_condition *cond) |
|
|
{ |
|
|
int pos = head->read_avail; |
|
|
if (!ccs_io_printf(head, KEYWORD_ALLOW_CHROOT "%s\n", |
|
|
ptr->dir->name)) |
|
|
goto out; |
|
|
if (!ccs_print_condition(head, cond)) |
|
|
goto out; |
|
|
return true; |
|
|
out: |
|
|
head->read_avail = pos; |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_pivot_root_acl - Print a pivot_root ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to "struct ccs_pivot_root_acl_record". |
|
|
* @cond: Pointer to "struct ccs_condition". May be NULL. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_pivot_root_acl(struct ccs_io_buffer *head, |
|
|
struct ccs_pivot_root_acl_record *ptr, |
|
|
const struct ccs_condition *cond) |
|
|
{ |
|
|
int pos = head->read_avail; |
|
|
if (!ccs_io_printf(head, KEYWORD_ALLOW_PIVOT_ROOT "%s %s\n", |
|
|
ptr->new_root->name, ptr->old_root->name)) |
|
|
goto out; |
|
|
if (!ccs_print_condition(head, cond)) |
|
|
goto out; |
|
|
return true; |
|
|
out: |
|
|
head->read_avail = pos; |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_print_entry - Print an ACL entry. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* @ptr: Pointer to an ACL entry. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool ccs_print_entry(struct ccs_io_buffer *head, |
|
|
struct ccs_acl_info *ptr) |
|
|
{ |
|
|
const struct ccs_condition *cond = ptr->cond; |
|
|
const u8 acl_type = ccs_acl_type2(ptr); |
|
|
if (acl_type & ACL_DELETED) |
|
|
return true; |
|
|
if (acl_type == TYPE_SINGLE_PATH_ACL) { |
|
|
struct ccs_single_path_acl_record *acl |
|
|
= container_of(ptr, struct ccs_single_path_acl_record, |
|
|
head); |
|
|
return ccs_print_single_path_acl(head, acl, cond); |
|
|
} |
|
|
if (acl_type == TYPE_EXECUTE_HANDLER) { |
|
|
struct ccs_execute_handler_record *acl |
|
|
= container_of(ptr, struct ccs_execute_handler_record, |
|
|
head); |
|
|
const char *keyword = KEYWORD_EXECUTE_HANDLER; |
|
|
return ccs_print_execute_handler_record(head, keyword, acl); |
|
|
} |
|
|
if (acl_type == TYPE_DENIED_EXECUTE_HANDLER) { |
|
|
struct ccs_execute_handler_record *acl |
|
|
= container_of(ptr, struct ccs_execute_handler_record, |
|
|
head); |
|
|
const char *keyword = KEYWORD_DENIED_EXECUTE_HANDLER; |
|
|
return ccs_print_execute_handler_record(head, keyword, acl); |
|
|
} |
|
|
if (head->read_execute_only) |
|
|
return true; |
|
|
if (acl_type == TYPE_MKDEV_ACL) { |
|
|
struct ccs_mkdev_acl_record *acl |
|
|
= container_of(ptr, struct ccs_mkdev_acl_record, head); |
|
|
return ccs_print_mkdev_acl(head, acl, cond); |
|
|
} |
|
|
if (acl_type == TYPE_DOUBLE_PATH_ACL) { |
|
|
struct ccs_double_path_acl_record *acl |
|
|
= container_of(ptr, struct ccs_double_path_acl_record, |
|
|
head); |
|
|
return ccs_print_double_path_acl(head, acl, cond); |
|
|
} |
|
|
if (acl_type == TYPE_IOCTL_ACL) { |
|
|
struct ccs_ioctl_acl_record *acl |
|
|
= container_of(ptr, struct ccs_ioctl_acl_record, head); |
|
|
return ccs_print_ioctl_acl(head, acl, cond); |
|
|
} |
|
|
if (acl_type == TYPE_ARGV0_ACL) { |
|
|
struct ccs_argv0_acl_record *acl |
|
|
= container_of(ptr, struct ccs_argv0_acl_record, head); |
|
|
return ccs_print_argv0_acl(head, acl, cond); |
|
|
} |
|
|
if (acl_type == TYPE_ENV_ACL) { |
|
|
struct ccs_env_acl_record *acl |
|
|
= container_of(ptr, struct ccs_env_acl_record, head); |
|
|
return ccs_print_env_acl(head, acl, cond); |
|
|
} |
|
|
if (acl_type == TYPE_CAPABILITY_ACL) { |
|
|
struct ccs_capability_acl_record *acl |
|
|
= container_of(ptr, struct ccs_capability_acl_record, |
|
|
head); |
|
|
return ccs_print_capability_acl(head, acl, cond); |
|
|
} |
|
|
if (acl_type == TYPE_IP_NETWORK_ACL) { |
|
|
struct ccs_ip_network_acl_record *acl |
|
|
= container_of(ptr, struct ccs_ip_network_acl_record, |
|
|
head); |
|
|
return ccs_print_network_acl(head, acl, cond); |
|
|
} |
|
|
if (acl_type == TYPE_SIGNAL_ACL) { |
|
|
struct ccs_signal_acl_record *acl |
|
|
= container_of(ptr, struct ccs_signal_acl_record, head); |
|
|
return ccs_print_signal_acl(head, acl, cond); |
|
|
} |
|
|
if (acl_type == TYPE_MOUNT_ACL) { |
|
|
struct ccs_mount_acl_record *acl |
|
|
= container_of(ptr, struct ccs_mount_acl_record, head); |
|
|
return ccs_print_mount_acl(head, acl, cond); |
|
|
} |
|
|
if (acl_type == TYPE_UMOUNT_ACL) { |
|
|
struct ccs_umount_acl_record *acl |
|
|
= container_of(ptr, struct ccs_umount_acl_record, head); |
|
|
return ccs_print_umount_acl(head, acl, cond); |
|
|
} |
|
|
if (acl_type == TYPE_CHROOT_ACL) { |
|
|
struct ccs_chroot_acl_record *acl |
|
|
= container_of(ptr, struct ccs_chroot_acl_record, head); |
|
|
return ccs_print_chroot_acl(head, acl, cond); |
|
|
} |
|
|
if (acl_type == TYPE_PIVOT_ROOT_ACL) { |
|
|
struct ccs_pivot_root_acl_record *acl |
|
|
= container_of(ptr, struct ccs_pivot_root_acl_record, |
|
|
head); |
|
|
return ccs_print_pivot_root_acl(head, acl, cond); |
|
|
} |
|
|
/* Workaround for gcc 3.2.2's inline bug. */ |
|
|
if (acl_type & ACL_DELETED) |
|
|
return true; |
|
|
BUG(); /* This must not happen. */ |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_read_domain_policy - Read domain policy. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns 0. |
|
|
* |
|
|
* Caller holds ccs_read_lock(). |
|
|
*/ |
|
|
static int ccs_read_domain_policy(struct ccs_io_buffer *head) |
|
|
{ |
|
|
struct list_head *dpos; |
|
|
struct list_head *apos; |
|
|
ccs_check_read_lock(); |
|
|
if (head->read_eof) |
|
|
return 0; |
|
|
if (head->read_step == 0) |
|
|
head->read_step = 1; |
|
|
list_for_each_cookie(dpos, head->read_var1, &ccs_domain_list) { |
|
|
struct ccs_domain_info *domain; |
|
|
const char *quota_exceeded = ""; |
|
|
const char *transition_failed = ""; |
|
|
const char *ignore_global_allow_read = ""; |
|
|
const char *ignore_global_allow_env = ""; |
|
|
domain = list_entry(dpos, struct ccs_domain_info, list); |
|
|
if (head->read_step != 1) |
|
|
goto acl_loop; |
|
|
if (domain->is_deleted && !head->read_single_domain) |
|
|
continue; |
|
|
/* Print domainname and flags. */ |
|
|
if (domain->quota_warned) |
|
|
quota_exceeded = "quota_exceeded\n"; |
|
|
if (domain->domain_transition_failed) |
|
|
transition_failed = "transition_failed\n"; |
|
|
if (domain->ignore_global_allow_read) |
|
|
ignore_global_allow_read |
|
|
= KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; |
|
|
if (domain->ignore_global_allow_env) |
|
|
ignore_global_allow_env |
|
|
= KEYWORD_IGNORE_GLOBAL_ALLOW_ENV "\n"; |
|
|
if (!ccs_io_printf(head, "%s\n" KEYWORD_USE_PROFILE "%u\n" |
|
|
"%s%s%s%s\n", domain->domainname->name, |
|
|
domain->profile, quota_exceeded, |
|
|
transition_failed, |
|
|
ignore_global_allow_read, |
|
|
ignore_global_allow_env)) |
|
|
return 0; |
|
|
head->read_step = 2; |
|
|
acl_loop: |
|
|
if (head->read_step == 3) |
|
|
goto tail_mark; |
|
|
/* Print ACL entries in the domain. */ |
|
|
list_for_each_cookie(apos, head->read_var2, |
|
|
&domain->acl_info_list) { |
|
|
struct ccs_acl_info *ptr |
|
|
= list_entry(apos, struct ccs_acl_info, list); |
|
|
if (!ccs_print_entry(head, ptr)) |
|
|
return 0; |
|
|
} |
|
|
head->read_step = 3; |
|
|
tail_mark: |
|
|
if (!ccs_io_printf(head, "\n")) |
|
|
return 0; |
|
|
head->read_step = 1; |
|
|
if (head->read_single_domain) |
|
|
break; |
|
|
} |
|
|
head->read_eof = true; |
|
|
return 0; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_write_domain_profile - Assign profile for specified domain. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns 0 on success, -EINVAL otherwise. |
|
|
* |
|
|
* This is equivalent to doing |
|
|
* |
|
|
* ( echo "select " $domainname; echo "use_profile " $profile ) | |
|
|
* /usr/lib/ccs/loadpolicy -d |
|
|
* |
|
|
* Caller holds ccs_read_lock(). |
|
|
*/ |
|
|
static int ccs_write_domain_profile(struct ccs_io_buffer *head) |
|
|
{ |
|
|
char *data = head->write_buf; |
|
|
char *cp = strchr(data, ' '); |
|
|
struct ccs_domain_info *domain; |
|
|
unsigned int profile; |
|
|
ccs_check_read_lock(); |
|
|
if (!cp) |
|
|
return -EINVAL; |
|
|
*cp = '\0'; |
|
|
profile = simple_strtoul(data, NULL, 10); |
|
|
if (profile >= MAX_PROFILES) |
|
|
return -EINVAL; |
|
|
domain = ccs_find_domain(cp + 1); |
|
|
if (domain && (ccs_profile_ptr[profile] || !ccs_policy_loaded)) |
|
|
domain->profile = (u8) profile; |
|
|
return 0; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_read_domain_profile - Read only domainname and profile. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns list of profile number and domainname pairs. |
|
|
* |
|
|
* This is equivalent to doing |
|
|
* |
|
|
* grep -A 1 '^<kernel>' /proc/ccs/domain_policy | |
|
|
* awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) |
|
|
* domainname = $0; } else if ( $1 == "use_profile" ) { |
|
|
* print $2 " " domainname; domainname = ""; } } ; ' |
|
|
* |
|
|
* Caller holds ccs_read_lock(). |
|
|
*/ |
|
|
static int ccs_read_domain_profile(struct ccs_io_buffer *head) |
|
|
{ |
|
|
struct list_head *pos; |
|
|
ccs_check_read_lock(); |
|
|
if (head->read_eof) |
|
|
return 0; |
|
|
list_for_each_cookie(pos, head->read_var1, &ccs_domain_list) { |
|
|
struct ccs_domain_info *domain; |
|
|
domain = list_entry(pos, struct ccs_domain_info, list); |
|
|
if (domain->is_deleted) |
|
|
continue; |
|
|
if (!ccs_io_printf(head, "%u %s\n", domain->profile, |
|
|
domain->domainname->name)) |
|
|
return 0; |
|
|
} |
|
|
head->read_eof = true; |
|
|
return 0; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_write_pid: Specify PID to obtain domainname. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns 0. |
|
|
*/ |
|
|
static int ccs_write_pid(struct ccs_io_buffer *head) |
|
|
{ |
|
|
head->read_eof = false; |
|
|
return 0; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_read_pid - Read information of a process. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns the domainname which the specified PID is in or |
|
|
* process information of the specified PID on success, |
|
|
* empty string otherwise. |
|
|
* |
|
|
* Caller holds ccs_read_lock(). |
|
|
*/ |
|
|
static int ccs_read_pid(struct ccs_io_buffer *head) |
|
|
{ |
|
|
char *buf = head->write_buf; |
|
|
bool task_info = false; |
|
|
unsigned int pid; |
|
|
struct task_struct *p; |
|
|
struct ccs_domain_info *domain = NULL; |
|
|
u32 ccs_flags = 0; |
|
|
ccs_check_read_lock(); |
|
|
/* Accessing write_buf is safe because head->io_sem is held. */ |
|
|
if (!buf) |
|
|
goto done; /* Do nothing if open(O_RDONLY). */ |
|
|
if (head->read_avail || head->read_eof) |
|
|
goto done; |
|
|
head->read_eof = true; |
|
|
if (ccs_str_starts(&buf, "info ")) |
|
|
task_info = true; |
|
|
pid = (unsigned int) simple_strtoul(buf, NULL, 10); |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
read_lock(&tasklist_lock); |
|
|
p = find_task_by_pid(pid); |
|
|
if (p) { |
|
|
domain = ccs_task_domain(p); |
|
|
ccs_flags = p->ccs_flags; |
|
|
} |
|
|
read_unlock(&tasklist_lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
if (!domain) |
|
|
goto done; |
|
|
if (!task_info) |
|
|
ccs_io_printf(head, "%u %u %s", pid, domain->profile, |
|
|
domain->domainname->name); |
|
|
else |
|
|
ccs_io_printf(head, "%u manager=%s execute_handler=%s " |
|
|
"state[0]=%u state[1]=%u state[2]=%u", pid, |
|
|
ccs_flags & CCS_TASK_IS_POLICY_MANAGER ? |
|
|
"yes" : "no", |
|
|
ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER ? |
|
|
"yes" : "no", |
|
|
(u8) (ccs_flags >> 24), |
|
|
(u8) (ccs_flags >> 16), |
|
|
(u8) (ccs_flags >> 8)); |
|
|
done: |
|
|
return 0; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_write_exception_policy - Write exception policy. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
static int ccs_write_exception_policy(struct ccs_io_buffer *head) |
|
|
{ |
|
|
char *data = head->write_buf; |
|
|
bool is_delete = ccs_str_starts(&data, KEYWORD_DELETE); |
|
|
if (ccs_str_starts(&data, KEYWORD_KEEP_DOMAIN)) |
|
|
return ccs_write_domain_keeper_policy(data, false, is_delete); |
|
|
if (ccs_str_starts(&data, KEYWORD_NO_KEEP_DOMAIN)) |
|
|
return ccs_write_domain_keeper_policy(data, true, is_delete); |
|
|
if (ccs_str_starts(&data, KEYWORD_INITIALIZE_DOMAIN)) |
|
|
return ccs_write_domain_initializer_policy(data, false, |
|
|
is_delete); |
|
|
if (ccs_str_starts(&data, KEYWORD_NO_INITIALIZE_DOMAIN)) |
|
|
return ccs_write_domain_initializer_policy(data, true, |
|
|
is_delete); |
|
|
if (ccs_str_starts(&data, KEYWORD_AGGREGATOR)) |
|
|
return ccs_write_aggregator_policy(data, is_delete); |
|
|
if (ccs_str_starts(&data, KEYWORD_ALLOW_READ)) |
|
|
return ccs_write_globally_readable_policy(data, is_delete); |
|
|
if (ccs_str_starts(&data, KEYWORD_ALLOW_ENV)) |
|
|
return ccs_write_globally_usable_env_policy(data, is_delete); |
|
|
if (ccs_str_starts(&data, KEYWORD_FILE_PATTERN)) |
|
|
return ccs_write_pattern_policy(data, is_delete); |
|
|
if (ccs_str_starts(&data, KEYWORD_PATH_GROUP)) |
|
|
return ccs_write_path_group_policy(data, is_delete); |
|
|
if (ccs_str_starts(&data, KEYWORD_NUMBER_GROUP)) |
|
|
return ccs_write_number_group_policy(data, is_delete); |
|
|
if (ccs_str_starts(&data, KEYWORD_DENY_REWRITE)) |
|
|
return ccs_write_no_rewrite_policy(data, is_delete); |
|
|
if (ccs_str_starts(&data, KEYWORD_ADDRESS_GROUP)) |
|
|
return ccs_write_address_group_policy(data, is_delete); |
|
|
if (ccs_str_starts(&data, KEYWORD_DENY_AUTOBIND)) |
|
|
return ccs_write_reserved_port_policy(data, is_delete); |
|
|
return -EINVAL; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_read_exception_policy - Read exception policy. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns 0 on success, -EINVAL otherwise. |
|
|
* |
|
|
* Caller holds ccs_read_lock(). |
|
|
*/ |
|
|
static int ccs_read_exception_policy(struct ccs_io_buffer *head) |
|
|
{ |
|
|
ccs_check_read_lock(); |
|
|
if (!head->read_eof) { |
|
|
switch (head->read_step) { |
|
|
case 0: |
|
|
head->read_var2 = NULL; |
|
|
head->read_step = 1; |
|
|
case 1: |
|
|
if (!ccs_read_domain_keeper_policy(head)) |
|
|
break; |
|
|
head->read_var2 = NULL; |
|
|
head->read_step = 2; |
|
|
case 2: |
|
|
if (!ccs_read_globally_readable_policy(head)) |
|
|
break; |
|
|
head->read_var2 = NULL; |
|
|
head->read_step = 3; |
|
|
case 3: |
|
|
if (!ccs_read_globally_usable_env_policy(head)) |
|
|
break; |
|
|
head->read_var2 = NULL; |
|
|
head->read_step = 4; |
|
|
case 4: |
|
|
if (!ccs_read_domain_initializer_policy(head)) |
|
|
break; |
|
|
head->read_var2 = NULL; |
|
|
head->read_step = 6; |
|
|
case 6: |
|
|
if (!ccs_read_aggregator_policy(head)) |
|
|
break; |
|
|
head->read_var2 = NULL; |
|
|
head->read_step = 7; |
|
|
case 7: |
|
|
if (!ccs_read_file_pattern(head)) |
|
|
break; |
|
|
head->read_var2 = NULL; |
|
|
head->read_step = 8; |
|
|
case 8: |
|
|
if (!ccs_read_no_rewrite_policy(head)) |
|
|
break; |
|
|
head->read_var2 = NULL; |
|
|
head->read_step = 9; |
|
|
case 9: |
|
|
if (!ccs_read_path_group_policy(head)) |
|
|
break; |
|
|
head->read_var1 = NULL; |
|
|
head->read_var2 = NULL; |
|
|
head->read_step = 10; |
|
|
case 10: |
|
|
if (!ccs_read_number_group_policy(head)) |
|
|
break; |
|
|
head->read_var1 = NULL; |
|
|
head->read_var2 = NULL; |
|
|
head->read_step = 11; |
|
|
case 11: |
|
|
if (!ccs_read_address_group_policy(head)) |
|
|
break; |
|
|
head->read_var2 = NULL; |
|
|
head->read_step = 12; |
|
|
case 12: |
|
|
if (!ccs_read_reserved_port_policy(head)) |
|
|
break; |
|
|
head->read_eof = true; |
|
|
break; |
|
|
default: |
|
|
return -EINVAL; |
|
|
} |
|
|
} |
|
|
return 0; |
|
|
} |
|
|
|
|
|
/* Path to the policy loader. The default is /sbin/ccs-init. */ |
|
|
static const char *ccs_loader; |
|
|
|
|
|
/** |
|
|
* ccs_loader_setup - Specify the policy loader to use. |
|
|
* |
|
|
* @str: Path to the policy loader. |
|
|
* |
|
|
* Returns 0. |
|
|
*/ |
|
|
static int __init ccs_loader_setup(char *str) |
|
|
{ |
|
|
ccs_loader = str; |
|
|
return 0; |
|
|
} |
|
|
|
|
|
__setup("CCS_loader=", ccs_loader_setup); |
|
|
|
|
|
/** |
|
|
* ccs_policy_loader_exists - Check whether /sbin/ccs-init exists. |
|
|
* |
|
|
* Returns true if /sbin/ccs-init exists, false otherwise. |
|
|
*/ |
|
|
static bool ccs_policy_loader_exists(void) |
|
|
{ |
|
|
/* |
|
|
* Don't activate MAC if the path given by 'CCS_loader=' option doesn't |
|
|
* exist. If the initrd includes /sbin/init but real-root-dev has not |
|
|
* mounted on / yet, activating MAC will block the system since |
|
|
* policies are not loaded yet. |
|
|
* Thus, let do_execve() call this function everytime. |
|
|
*/ |
|
|
struct nameidata nd; |
|
|
if (!ccs_loader) |
|
|
ccs_loader = "/sbin/ccs-init"; |
|
|
if (path_lookup(ccs_loader, ccs_lookup_flags, &nd)) { |
|
|
printk(KERN_INFO "Not activating Mandatory Access Control now " |
|
|
"since %s doesn't exist.\n", ccs_loader); |
|
|
return false; |
|
|
} |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
|
|
path_put(&nd.path); |
|
|
#else |
|
|
path_release(&nd); |
|
|
#endif |
|
|
return true; |
|
|
} |
|
|
|
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) |
|
|
/** |
|
|
* ccs_run_loader - Start /sbin/ccs-init . |
|
|
* |
|
|
* @unused: Not used. |
|
|
* |
|
|
* Returns PID of /sbin/ccs-init on success, negative value otherwise. |
|
|
*/ |
|
|
static int ccs_run_loader(void *unused) |
|
|
{ |
|
|
char *argv[2]; |
|
|
char *envp[3]; |
|
|
printk(KERN_INFO "Calling %s to load policy. Please wait.\n", |
|
|
ccs_loader); |
|
|
argv[0] = (char *) ccs_loader; |
|
|
argv[1] = NULL; |
|
|
envp[0] = "HOME=/"; |
|
|
envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; |
|
|
envp[2] = NULL; |
|
|
return exec_usermodehelper(argv[0], argv, envp); |
|
|
} |
|
|
#endif |
|
|
|
|
|
/** |
|
|
* ccs_load_policy - Run external policy loader to load policy. |
|
|
* |
|
|
* @filename: The program about to start. |
|
|
* |
|
|
* This function checks whether @filename is /sbin/init , and if so |
|
|
* invoke /sbin/ccs-init and wait for the termination of /sbin/ccs-init |
|
|
* and then continues invocation of /sbin/init. |
|
|
* /sbin/ccs-init reads policy files in /etc/ccs/ directory and |
|
|
* writes to /proc/ccs/ interfaces. |
|
|
* |
|
|
* Returns nothing. |
|
|
*/ |
|
|
void ccs_load_policy(const char *filename) |
|
|
{ |
|
|
if (ccs_policy_loaded) |
|
|
return; |
|
|
/* |
|
|
* Check filename is /sbin/init or /sbin/ccs-start. |
|
|
* /sbin/ccs-start is a dummy filename in case where /sbin/init can't |
|
|
* be passed. |
|
|
* You can create /sbin/ccs-start by "ln -s /bin/true /sbin/ccs-start". |
|
|
*/ |
|
|
if (strcmp(filename, "/sbin/init") && |
|
|
strcmp(filename, "/sbin/ccs-start")) |
|
|
return; |
|
|
if (!ccs_policy_loader_exists()) |
|
|
return; |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
|
|
{ |
|
|
char *argv[2]; |
|
|
char *envp[3]; |
|
|
printk(KERN_INFO "Calling %s to load policy. Please wait.\n", |
|
|
ccs_loader); |
|
|
argv[0] = (char *) ccs_loader; |
|
|
argv[1] = NULL; |
|
|
envp[0] = "HOME=/"; |
|
|
envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; |
|
|
envp[2] = NULL; |
|
|
call_usermodehelper(argv[0], argv, envp, 1); |
|
|
} |
|
|
#elif defined(TASK_DEAD) |
|
|
{ |
|
|
/* Copied from kernel/kmod.c */ |
|
|
struct task_struct *task = current; |
|
|
pid_t pid = kernel_thread(ccs_run_loader, NULL, 0); |
|
|
sigset_t tmpsig; |
|
|
spin_lock_irq(&task->sighand->siglock); |
|
|
tmpsig = task->blocked; |
|
|
siginitsetinv(&task->blocked, |
|
|
sigmask(SIGKILL) | sigmask(SIGSTOP)); |
|
|
recalc_sigpending(); |
|
|
spin_unlock_irq(¤t->sighand->siglock); |
|
|
if (pid >= 0) |
|
|
waitpid(pid, NULL, __WCLONE); |
|
|
spin_lock_irq(&task->sighand->siglock); |
|
|
task->blocked = tmpsig; |
|
|
recalc_sigpending(); |
|
|
spin_unlock_irq(&task->sighand->siglock); |
|
|
} |
|
|
#else |
|
|
{ |
|
|
/* Copied from kernel/kmod.c */ |
|
|
struct task_struct *task = current; |
|
|
pid_t pid = kernel_thread(ccs_run_loader, NULL, 0); |
|
|
sigset_t tmpsig; |
|
|
spin_lock_irq(&task->sigmask_lock); |
|
|
tmpsig = task->blocked; |
|
|
siginitsetinv(&task->blocked, |
|
|
sigmask(SIGKILL) | sigmask(SIGSTOP)); |
|
|
recalc_sigpending(task); |
|
|
spin_unlock_irq(&task->sigmask_lock); |
|
|
if (pid >= 0) |
|
|
waitpid(pid, NULL, __WCLONE); |
|
|
spin_lock_irq(&task->sigmask_lock); |
|
|
task->blocked = tmpsig; |
|
|
recalc_sigpending(task); |
|
|
spin_unlock_irq(&task->sigmask_lock); |
|
|
} |
|
|
#endif |
|
|
printk(KERN_INFO "SAKURA: 1.7.0-pre 2009/07/03\n"); |
|
|
printk(KERN_INFO "TOMOYO: 1.7.0-pre 2009/07/03\n"); |
|
|
printk(KERN_INFO "Mandatory Access Control activated.\n"); |
|
|
ccs_policy_loaded = true; |
|
|
{ /* Check all profiles currently assigned to domains are defined. */ |
|
|
struct ccs_domain_info *domain; |
|
|
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
|
|
const u8 profile = domain->profile; |
|
|
if (ccs_profile_ptr[profile]) |
|
|
continue; |
|
|
panic("Profile %u (used by '%s') not defined.\n", |
|
|
profile, domain->domainname->name); |
|
|
} |
|
|
} |
|
|
} |
|
|
|
|
|
/* Wait queue for ccs_query_list. */ |
|
|
static DECLARE_WAIT_QUEUE_HEAD(ccs_query_wait); |
|
|
|
|
|
/* Lock for manipulating ccs_query_list. */ |
|
|
static DEFINE_SPINLOCK(ccs_query_list_lock); |
|
|
|
|
|
/* Structure for query. */ |
|
|
struct ccs_query_entry { |
|
|
struct list_head list; |
|
|
char *query; |
|
|
int query_len; |
|
|
unsigned int serial; |
|
|
int timer; |
|
|
int answer; |
|
|
}; |
|
|
|
|
|
/* The list for "struct ccs_query_entry". */ |
|
|
static LIST_HEAD(ccs_query_list); |
|
|
|
|
|
/* Number of "struct file" referring /proc/ccs/query interface. */ |
|
|
static atomic_t ccs_query_observers = ATOMIC_INIT(0); |
|
|
|
|
|
/** |
|
|
* ccs_check_supervisor - Ask for the supervisor's decision. |
|
|
* |
|
|
* @r: Pointer to "struct ccs_request_info". |
|
|
* @fmt: The printf()'s format string, followed by parameters. |
|
|
* |
|
|
* Returns 0 if the supervisor decided to permit the access request which |
|
|
* violated the policy in enforcing mode, 1 if the supervisor decided to |
|
|
* retry the access request which violated the policy in enforcing mode, |
|
|
* -EPERM otherwise. |
|
|
*/ |
|
|
int ccs_check_supervisor(struct ccs_request_info *r, const char *fmt, ...) |
|
|
{ |
|
|
va_list args; |
|
|
int error = -EPERM; |
|
|
int pos; |
|
|
int len; |
|
|
static unsigned int ccs_serial; |
|
|
struct ccs_query_entry *ccs_query_entry = NULL; |
|
|
bool quota_exceeded = false; |
|
|
char *header; |
|
|
if (!r->domain) |
|
|
r->domain = ccs_current_domain(); |
|
|
if (!atomic_read(&ccs_query_observers)) { |
|
|
int i; |
|
|
if (current->ccs_flags & CCS_DONT_SLEEP_ON_ENFORCE_ERROR) |
|
|
return -EPERM; |
|
|
for (i = 0; i < ccs_check_flags(r->domain, CCS_SLEEP_PERIOD); |
|
|
i++) { |
|
|
set_current_state(TASK_INTERRUPTIBLE); |
|
|
schedule_timeout(HZ / 10); |
|
|
} |
|
|
return -EPERM; |
|
|
} |
|
|
va_start(args, fmt); |
|
|
len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32; |
|
|
va_end(args); |
|
|
header = ccs_init_audit_log(&len, r); |
|
|
if (!header) |
|
|
goto out; |
|
|
ccs_query_entry = kzalloc(sizeof(*ccs_query_entry), GFP_KERNEL); |
|
|
if (!ccs_query_entry) |
|
|
goto out; |
|
|
ccs_query_entry->query = kzalloc(len, GFP_KERNEL); |
|
|
if (!ccs_query_entry->query) |
|
|
goto out; |
|
|
INIT_LIST_HEAD(&ccs_query_entry->list); |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
spin_lock(&ccs_query_list_lock); |
|
|
if (ccs_quota_for_query && ccs_query_memory_size + len + |
|
|
sizeof(*ccs_query_entry) >= ccs_quota_for_query) { |
|
|
quota_exceeded = true; |
|
|
} else { |
|
|
ccs_query_memory_size += len + sizeof(*ccs_query_entry); |
|
|
ccs_query_entry->serial = ccs_serial++; |
|
|
} |
|
|
spin_unlock(&ccs_query_list_lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
if (quota_exceeded) |
|
|
goto out; |
|
|
pos = snprintf(ccs_query_entry->query, len - 1, "Q%u-%hu\n%s", |
|
|
ccs_query_entry->serial, r->retry, header); |
|
|
kfree(header); |
|
|
header = NULL; |
|
|
va_start(args, fmt); |
|
|
vsnprintf(ccs_query_entry->query + pos, len - 1 - pos, fmt, args); |
|
|
ccs_query_entry->query_len = strlen(ccs_query_entry->query) + 1; |
|
|
va_end(args); |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
spin_lock(&ccs_query_list_lock); |
|
|
list_add_tail(&ccs_query_entry->list, &ccs_query_list); |
|
|
spin_unlock(&ccs_query_list_lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
/* Give 10 seconds for supervisor's opinion. */ |
|
|
for (ccs_query_entry->timer = 0; |
|
|
atomic_read(&ccs_query_observers) && ccs_query_entry->timer < 100; |
|
|
ccs_query_entry->timer++) { |
|
|
wake_up(&ccs_query_wait); |
|
|
set_current_state(TASK_INTERRUPTIBLE); |
|
|
schedule_timeout(HZ / 10); |
|
|
if (ccs_query_entry->answer) |
|
|
break; |
|
|
} |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
spin_lock(&ccs_query_list_lock); |
|
|
list_del(&ccs_query_entry->list); |
|
|
ccs_query_memory_size -= len + sizeof(*ccs_query_entry); |
|
|
spin_unlock(&ccs_query_list_lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
switch (ccs_query_entry->answer) { |
|
|
case 3: /* Asked to retry by administrator. */ |
|
|
error = 1; |
|
|
r->retry++; |
|
|
break; |
|
|
case 1: |
|
|
/* Granted by administrator. */ |
|
|
error = 0; |
|
|
break; |
|
|
case 0: |
|
|
/* Timed out. */ |
|
|
break; |
|
|
default: |
|
|
/* Rejected by administrator. */ |
|
|
break; |
|
|
} |
|
|
out: |
|
|
if (ccs_query_entry) |
|
|
kfree(ccs_query_entry->query); |
|
|
kfree(ccs_query_entry); |
|
|
kfree(header); |
|
|
return error; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_poll_query - poll() for /proc/ccs/query. |
|
|
* |
|
|
* @file: Pointer to "struct file". |
|
|
* @wait: Pointer to "poll_table". |
|
|
* |
|
|
* Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. |
|
|
* |
|
|
* Waits for access requests which violated policy in enforcing mode. |
|
|
*/ |
|
|
static int ccs_poll_query(struct file *file, poll_table *wait) |
|
|
{ |
|
|
struct list_head *tmp; |
|
|
bool found = false; |
|
|
u8 i; |
|
|
for (i = 0; i < 2; i++) { |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
spin_lock(&ccs_query_list_lock); |
|
|
list_for_each(tmp, &ccs_query_list) { |
|
|
struct ccs_query_entry *ptr |
|
|
= list_entry(tmp, struct ccs_query_entry, list); |
|
|
if (ptr->answer) |
|
|
continue; |
|
|
found = true; |
|
|
break; |
|
|
} |
|
|
spin_unlock(&ccs_query_list_lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
if (found) |
|
|
return POLLIN | POLLRDNORM; |
|
|
if (i) |
|
|
break; |
|
|
poll_wait(file, &ccs_query_wait, wait); |
|
|
} |
|
|
return 0; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_read_query - Read access requests which violated policy in enforcing mode. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns 0. |
|
|
*/ |
|
|
static int ccs_read_query(struct ccs_io_buffer *head) |
|
|
{ |
|
|
struct list_head *tmp; |
|
|
int pos = 0; |
|
|
int len = 0; |
|
|
char *buf; |
|
|
if (head->read_avail) |
|
|
return 0; |
|
|
if (head->read_buf) { |
|
|
kfree(head->read_buf); |
|
|
head->read_buf = NULL; |
|
|
head->readbuf_size = 0; |
|
|
} |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
spin_lock(&ccs_query_list_lock); |
|
|
list_for_each(tmp, &ccs_query_list) { |
|
|
struct ccs_query_entry *ptr |
|
|
= list_entry(tmp, struct ccs_query_entry, list); |
|
|
if (ptr->answer) |
|
|
continue; |
|
|
if (pos++ != head->read_step) |
|
|
continue; |
|
|
len = ptr->query_len; |
|
|
break; |
|
|
} |
|
|
spin_unlock(&ccs_query_list_lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
if (!len) { |
|
|
head->read_step = 0; |
|
|
return 0; |
|
|
} |
|
|
buf = kzalloc(len, GFP_KERNEL); |
|
|
if (!buf) |
|
|
return 0; |
|
|
pos = 0; |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
spin_lock(&ccs_query_list_lock); |
|
|
list_for_each(tmp, &ccs_query_list) { |
|
|
struct ccs_query_entry *ptr |
|
|
= list_entry(tmp, struct ccs_query_entry, list); |
|
|
if (ptr->answer) |
|
|
continue; |
|
|
if (pos++ != head->read_step) |
|
|
continue; |
|
|
/* |
|
|
* Some query can be skipped because ccs_query_list |
|
|
* can change, but I don't care. |
|
|
*/ |
|
|
if (len == ptr->query_len) |
|
|
memmove(buf, ptr->query, len); |
|
|
break; |
|
|
} |
|
|
spin_unlock(&ccs_query_list_lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
if (buf[0]) { |
|
|
head->read_avail = len; |
|
|
head->readbuf_size = head->read_avail; |
|
|
head->read_buf = buf; |
|
|
head->read_step++; |
|
|
} else { |
|
|
kfree(buf); |
|
|
} |
|
|
return 0; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_write_answer - Write the supervisor's decision. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns 0 on success, -EINVAL otherwise. |
|
|
*/ |
|
|
static int ccs_write_answer(struct ccs_io_buffer *head) |
|
|
{ |
|
|
char *data = head->write_buf; |
|
|
struct list_head *tmp; |
|
|
unsigned int serial; |
|
|
unsigned int answer; |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
spin_lock(&ccs_query_list_lock); |
|
|
list_for_each(tmp, &ccs_query_list) { |
|
|
struct ccs_query_entry *ptr |
|
|
= list_entry(tmp, struct ccs_query_entry, list); |
|
|
ptr->timer = 0; |
|
|
} |
|
|
spin_unlock(&ccs_query_list_lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
if (sscanf(data, "A%u=%u", &serial, &answer) != 2) |
|
|
return -EINVAL; |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
spin_lock(&ccs_query_list_lock); |
|
|
list_for_each(tmp, &ccs_query_list) { |
|
|
struct ccs_query_entry *ptr |
|
|
= list_entry(tmp, struct ccs_query_entry, list); |
|
|
if (ptr->serial != serial) |
|
|
continue; |
|
|
if (!ptr->answer) |
|
|
ptr->answer = answer; |
|
|
break; |
|
|
} |
|
|
spin_unlock(&ccs_query_list_lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
return 0; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_read_version: Get version. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns version information. |
|
|
*/ |
|
|
static int ccs_read_version(struct ccs_io_buffer *head) |
|
|
{ |
|
|
if (!head->read_eof) { |
|
|
ccs_io_printf(head, "1.7.0-pre"); |
|
|
head->read_eof = true; |
|
|
} |
|
|
return 0; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_read_self_domain - Get the current process's domainname. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns the current process's domainname. |
|
|
*/ |
|
|
static int ccs_read_self_domain(struct ccs_io_buffer *head) |
|
|
{ |
|
|
if (!head->read_eof) { |
|
|
/* |
|
|
* ccs_current_domain()->domainname != NULL |
|
|
* because every process belongs to a domain and |
|
|
* the domain's name cannot be NULL. |
|
|
*/ |
|
|
ccs_io_printf(head, "%s", |
|
|
ccs_current_domain()->domainname->name); |
|
|
head->read_eof = true; |
|
|
} |
|
|
return 0; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_open_control - open() for /proc/ccs/ interface. |
|
|
* |
|
|
* @type: Type of interface. |
|
|
* @file: Pointer to "struct file". |
|
|
* |
|
|
* Associates policy handler and returns 0 on success, -ENOMEM otherwise. |
|
|
*/ |
|
|
int ccs_open_control(const u8 type, struct file *file) |
|
|
{ |
|
|
struct ccs_io_buffer *head = kzalloc(sizeof(*head), GFP_KERNEL); |
|
|
if (!head) |
|
|
return -ENOMEM; |
|
|
mutex_init(&head->io_sem); |
|
|
head->type = type; |
|
|
switch (type) { |
|
|
case CCS_DOMAINPOLICY: /* /proc/ccs/domain_policy */ |
|
|
head->write = ccs_write_domain_policy; |
|
|
head->read = ccs_read_domain_policy; |
|
|
break; |
|
|
case CCS_EXCEPTIONPOLICY: /* /proc/ccs/exception_policy */ |
|
|
head->write = ccs_write_exception_policy; |
|
|
head->read = ccs_read_exception_policy; |
|
|
break; |
|
|
#ifdef CONFIG_CCSECURITY_AUDIT |
|
|
case CCS_GRANTLOG: /* /proc/ccs/grant_log */ |
|
|
head->poll = ccs_poll_grant_log; |
|
|
head->read = ccs_read_grant_log; |
|
|
break; |
|
|
case CCS_REJECTLOG: /* /proc/ccs/reject_log */ |
|
|
head->poll = ccs_poll_reject_log; |
|
|
head->read = ccs_read_reject_log; |
|
|
break; |
|
|
#endif |
|
|
case CCS_SELFDOMAIN: /* /proc/ccs/self_domain */ |
|
|
head->read = ccs_read_self_domain; |
|
|
break; |
|
|
case CCS_DOMAIN_STATUS: /* /proc/ccs/.domain_status */ |
|
|
head->write = ccs_write_domain_profile; |
|
|
head->read = ccs_read_domain_profile; |
|
|
break; |
|
|
case CCS_EXECUTE_HANDLER: /* /proc/ccs/.execute_handler */ |
|
|
/* Allow execute_handler to read process's status. */ |
|
|
if (!(current->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER)) { |
|
|
kfree(head); |
|
|
return -EPERM; |
|
|
} |
|
|
/* fall through */ |
|
|
case CCS_PROCESS_STATUS: /* /proc/ccs/.process_status */ |
|
|
head->write = ccs_write_pid; |
|
|
head->read = ccs_read_pid; |
|
|
break; |
|
|
case CCS_VERSION: /* /proc/ccs/version */ |
|
|
head->read = ccs_read_version; |
|
|
head->readbuf_size = 128; |
|
|
break; |
|
|
case CCS_MEMINFO: /* /proc/ccs/meminfo */ |
|
|
head->write = ccs_write_memory_quota; |
|
|
head->read = ccs_read_memory_counter; |
|
|
head->readbuf_size = 512; |
|
|
break; |
|
|
case CCS_PROFILE: /* /proc/ccs/profile */ |
|
|
head->write = ccs_write_profile; |
|
|
head->read = ccs_read_profile; |
|
|
break; |
|
|
case CCS_QUERY: /* /proc/ccs/query */ |
|
|
head->poll = ccs_poll_query; |
|
|
head->write = ccs_write_answer; |
|
|
head->read = ccs_read_query; |
|
|
break; |
|
|
case CCS_MANAGER: /* /proc/ccs/manager */ |
|
|
head->write = ccs_write_manager_policy; |
|
|
head->read = ccs_read_manager_policy; |
|
|
break; |
|
|
} |
|
|
if (!(file->f_mode & FMODE_READ)) { |
|
|
/* |
|
|
* No need to allocate read_buf since it is not opened |
|
|
* for reading. |
|
|
*/ |
|
|
head->read = NULL; |
|
|
head->poll = NULL; |
|
|
} else if (type != CCS_QUERY && |
|
|
type != CCS_GRANTLOG && type != CCS_REJECTLOG) { |
|
|
/* |
|
|
* Don't allocate buffer for reading if the file is one of |
|
|
* /proc/ccs/grant_log , /proc/ccs/reject_log , /proc/ccs/query. |
|
|
*/ |
|
|
if (!head->readbuf_size) |
|
|
head->readbuf_size = 4096 * 2; |
|
|
head->read_buf = kzalloc(head->readbuf_size, GFP_KERNEL); |
|
|
if (!head->read_buf) { |
|
|
kfree(head); |
|
|
return -ENOMEM; |
|
|
} |
|
|
} |
|
|
if (!(file->f_mode & FMODE_WRITE)) { |
|
|
/* |
|
|
* No need to allocate write_buf since it is not opened |
|
|
* for writing. |
|
|
*/ |
|
|
head->write = NULL; |
|
|
} else if (head->write) { |
|
|
head->writebuf_size = 4096 * 2; |
|
|
head->write_buf = kzalloc(head->writebuf_size, GFP_KERNEL); |
|
|
if (!head->write_buf) { |
|
|
kfree(head->read_buf); |
|
|
kfree(head); |
|
|
return -ENOMEM; |
|
|
} |
|
|
} |
|
|
if (type != CCS_QUERY && |
|
|
type != CCS_GRANTLOG && type != CCS_REJECTLOG) |
|
|
head->reader_idx = ccs_read_lock(); |
|
|
file->private_data = head; |
|
|
/* |
|
|
* Call the handler now if the file is /proc/ccs/self_domain |
|
|
* so that the user can use "cat < /proc/ccs/self_domain" to |
|
|
* know the current process's domainname. |
|
|
*/ |
|
|
if (type == CCS_SELFDOMAIN) |
|
|
ccs_read_control(file, NULL, 0); |
|
|
/* |
|
|
* If the file is /proc/ccs/query , increment the observer counter. |
|
|
* The obserber counter is used by ccs_check_supervisor() to see if |
|
|
* there is some process monitoring /proc/ccs/query. |
|
|
*/ |
|
|
else if (type == CCS_QUERY) |
|
|
atomic_inc(&ccs_query_observers); |
|
|
return 0; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_poll_control - poll() for /proc/ccs/ interface. |
|
|
* |
|
|
* @file: Pointer to "struct file". |
|
|
* @wait: Pointer to "poll_table". |
|
|
* |
|
|
* Waits for read readiness. |
|
|
* /proc/ccs/query is handled by /usr/lib/ccs/ccs-queryd and |
|
|
* /proc/ccs/grant_log and /proc/ccs/reject_log are handled by |
|
|
* /usr/lib/ccs/ccs-auditd. |
|
|
*/ |
|
|
int ccs_poll_control(struct file *file, poll_table *wait) |
|
|
{ |
|
|
struct ccs_io_buffer *head = file->private_data; |
|
|
if (!head->poll) |
|
|
return -ENOSYS; |
|
|
return head->poll(file, wait); |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_read_control - read() for /proc/ccs/ interface. |
|
|
* |
|
|
* @file: Pointer to "struct file". |
|
|
* @buffer: Poiner to buffer to write to. |
|
|
* @buffer_len: Size of @buffer. |
|
|
* |
|
|
* Returns bytes read on success, negative value otherwise. |
|
|
*/ |
|
|
int ccs_read_control(struct file *file, char __user *buffer, |
|
|
const int buffer_len) |
|
|
{ |
|
|
int len = 0; |
|
|
struct ccs_io_buffer *head = file->private_data; |
|
|
char *cp; |
|
|
if (!head->read) |
|
|
return -ENOSYS; |
|
|
if (!access_ok(VERIFY_WRITE, buffer, buffer_len)) |
|
|
return -EFAULT; |
|
|
if (mutex_lock_interruptible(&head->io_sem)) |
|
|
return -EINTR; |
|
|
/* Call the policy handler. */ |
|
|
len = head->read(head); |
|
|
if (len < 0) |
|
|
goto out; |
|
|
/* Write to buffer. */ |
|
|
len = head->read_avail; |
|
|
if (len > buffer_len) |
|
|
len = buffer_len; |
|
|
if (!len) |
|
|
goto out; |
|
|
/* head->read_buf changes by some functions. */ |
|
|
cp = head->read_buf; |
|
|
if (copy_to_user(buffer, cp, len)) { |
|
|
len = -EFAULT; |
|
|
goto out; |
|
|
} |
|
|
head->read_avail -= len; |
|
|
memmove(cp, cp + len, head->read_avail); |
|
|
out: |
|
|
mutex_unlock(&head->io_sem); |
|
|
return len; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_write_control - write() for /proc/ccs/ interface. |
|
|
* |
|
|
* @file: Pointer to "struct file". |
|
|
* @buffer: Pointer to buffer to read from. |
|
|
* @buffer_len: Size of @buffer. |
|
|
* |
|
|
* Returns @buffer_len on success, negative value otherwise. |
|
|
*/ |
|
|
int ccs_write_control(struct file *file, const char __user *buffer, |
|
|
const int buffer_len) |
|
|
{ |
|
|
struct ccs_io_buffer *head = file->private_data; |
|
|
int error = buffer_len; |
|
|
int avail_len = buffer_len; |
|
|
char *cp0 = head->write_buf; |
|
|
if (!head->write) |
|
|
return -ENOSYS; |
|
|
if (!access_ok(VERIFY_READ, buffer, buffer_len)) |
|
|
return -EFAULT; |
|
|
/* Don't allow updating policies by non manager programs. */ |
|
|
if (head->write != ccs_write_pid && |
|
|
head->write != ccs_write_domain_policy && |
|
|
!ccs_is_policy_manager()) |
|
|
return -EPERM; |
|
|
if (mutex_lock_interruptible(&head->io_sem)) |
|
|
return -EINTR; |
|
|
/* Read a line and dispatch it to the policy handler. */ |
|
|
while (avail_len > 0) { |
|
|
char c; |
|
|
if (head->write_avail >= head->writebuf_size - 1) { |
|
|
error = -ENOMEM; |
|
|
break; |
|
|
} else if (get_user(c, buffer)) { |
|
|
error = -EFAULT; |
|
|
break; |
|
|
} |
|
|
buffer++; |
|
|
avail_len--; |
|
|
cp0[head->write_avail++] = c; |
|
|
if (c != '\n') |
|
|
continue; |
|
|
cp0[head->write_avail - 1] = '\0'; |
|
|
head->write_avail = 0; |
|
|
ccs_normalize_line(cp0); |
|
|
head->write(head); |
|
|
} |
|
|
mutex_unlock(&head->io_sem); |
|
|
return error; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_close_control - close() for /proc/ccs/ interface. |
|
|
* |
|
|
* @file: Pointer to "struct file". |
|
|
* |
|
|
* Releases memory and returns 0. |
|
|
*/ |
|
|
int ccs_close_control(struct file *file) |
|
|
{ |
|
|
struct ccs_io_buffer *head = file->private_data; |
|
|
const bool is_write = head->write_buf != NULL; |
|
|
const u8 type = head->type; |
|
|
/* |
|
|
* If the file is /proc/ccs/query , decrement the observer counter. |
|
|
*/ |
|
|
if (type == CCS_QUERY) |
|
|
atomic_dec(&ccs_query_observers); |
|
|
if (type != CCS_QUERY && |
|
|
type != CCS_GRANTLOG && type != CCS_REJECTLOG) |
|
|
ccs_read_unlock(head->reader_idx); |
|
|
/* Release memory used for policy I/O. */ |
|
|
kfree(head->read_buf); |
|
|
head->read_buf = NULL; |
|
|
kfree(head->write_buf); |
|
|
head->write_buf = NULL; |
|
|
kfree(head); |
|
|
head = NULL; |
|
|
file->private_data = NULL; |
|
|
if (is_write) |
|
|
ccs_run_gc(); |
|
|
return 0; |
|
|
} |
|