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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2011-07-08 13:21:37 +0900
committerJames Morris <jmorris@namei.org>2011-07-11 11:05:32 +1000
commit2066a36125fcbf5220990173b9d8e8bc49ad7538 (patch)
treec8ea3a6d92a8b4b68cda986601336e8e8f58553e /security
parent5c4274f13819b40e726f6ee4ef13b4952cff5010 (diff)
downloadlinux-linaro-precise-2066a36125fcbf5220990173b9d8e8bc49ad7538.tar.gz
TOMOYO: Allow using UID/GID etc. of current thread as conditions.
This patch adds support for permission checks using current thread's UID/GID etc. in addition to pathnames. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security')
-rw-r--r--security/tomoyo/Makefile2
-rw-r--r--security/tomoyo/audit.c32
-rw-r--r--security/tomoyo/common.c146
-rw-r--r--security/tomoyo/common.h97
-rw-r--r--security/tomoyo/condition.c349
-rw-r--r--security/tomoyo/domain.c21
-rw-r--r--security/tomoyo/gc.c39
-rw-r--r--security/tomoyo/util.c2
8 files changed, 651 insertions, 37 deletions
diff --git a/security/tomoyo/Makefile b/security/tomoyo/Makefile
index 04f676a940a..95278b71fc2 100644
--- a/security/tomoyo/Makefile
+++ b/security/tomoyo/Makefile
@@ -1,4 +1,4 @@
-obj-y = audit.o common.o domain.o file.o gc.o group.o load_policy.o memory.o mount.o realpath.o securityfs_if.o tomoyo.o util.o
+obj-y = audit.o common.o condition.o domain.o file.o gc.o group.o load_policy.o memory.o mount.o realpath.o securityfs_if.o tomoyo.o util.o
$(obj)/policy/profile.conf:
@mkdir -p $(obj)/policy/
diff --git a/security/tomoyo/audit.c b/security/tomoyo/audit.c
index 967b5648dce..9381d0e7f78 100644
--- a/security/tomoyo/audit.c
+++ b/security/tomoyo/audit.c
@@ -25,7 +25,7 @@ static char *tomoyo_print_header(struct tomoyo_request_info *r)
const pid_t gpid = task_pid_nr(current);
static const int tomoyo_buffer_len = 4096;
char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
- pid_t ppid;
+ int pos;
if (!buffer)
return NULL;
{
@@ -33,21 +33,21 @@ static char *tomoyo_print_header(struct tomoyo_request_info *r)
do_gettimeofday(&tv);
tomoyo_convert_time(tv.tv_sec, &stamp);
}
- rcu_read_lock();
- ppid = task_tgid_vnr(current->real_parent);
- rcu_read_unlock();
- snprintf(buffer, tomoyo_buffer_len - 1,
- "#%04u/%02u/%02u %02u:%02u:%02u# profile=%u mode=%s "
- "granted=%s (global-pid=%u) task={ pid=%u ppid=%u "
- "uid=%u gid=%u euid=%u egid=%u suid=%u sgid=%u "
- "fsuid=%u fsgid=%u }",
- stamp.year, stamp.month, stamp.day, stamp.hour,
- stamp.min, stamp.sec, r->profile, tomoyo_mode[r->mode],
- tomoyo_yesno(r->granted), gpid, task_tgid_vnr(current), ppid,
- current_uid(), current_gid(), current_euid(), current_egid(),
- current_suid(), current_sgid(), current_fsuid(),
- current_fsgid());
- return buffer;
+ pos = snprintf(buffer, tomoyo_buffer_len - 1,
+ "#%04u/%02u/%02u %02u:%02u:%02u# profile=%u mode=%s "
+ "granted=%s (global-pid=%u) task={ pid=%u ppid=%u "
+ "uid=%u gid=%u euid=%u egid=%u suid=%u sgid=%u "
+ "fsuid=%u fsgid=%u }", stamp.year, stamp.month,
+ stamp.day, stamp.hour, stamp.min, stamp.sec, r->profile,
+ tomoyo_mode[r->mode], tomoyo_yesno(r->granted), gpid,
+ tomoyo_sys_getpid(), tomoyo_sys_getppid(),
+ current_uid(), current_gid(), current_euid(),
+ current_egid(), current_suid(), current_sgid(),
+ current_fsuid(), current_fsgid());
+ if (pos < tomoyo_buffer_len - 1)
+ return buffer;
+ kfree(buffer);
+ return NULL;
}
/**
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index b340137a921..32ce1705b85 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -48,6 +48,20 @@ const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
};
+/* String table for conditions. */
+const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
+ [TOMOYO_TASK_UID] = "task.uid",
+ [TOMOYO_TASK_EUID] = "task.euid",
+ [TOMOYO_TASK_SUID] = "task.suid",
+ [TOMOYO_TASK_FSUID] = "task.fsuid",
+ [TOMOYO_TASK_GID] = "task.gid",
+ [TOMOYO_TASK_EGID] = "task.egid",
+ [TOMOYO_TASK_SGID] = "task.sgid",
+ [TOMOYO_TASK_FSGID] = "task.fsgid",
+ [TOMOYO_TASK_PID] = "task.pid",
+ [TOMOYO_TASK_PPID] = "task.ppid",
+};
+
/* String table for PREFERENCE keyword. */
static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
[TOMOYO_PREF_MAX_AUDIT_LOG] = "max_audit_log",
@@ -294,15 +308,16 @@ static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
}
/**
- * tomoyo_print_number_union - Print a tomoyo_number_union.
+ * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
*
- * @head: Pointer to "struct tomoyo_io_buffer".
- * @ptr: Pointer to "struct tomoyo_number_union".
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @ptr: Pointer to "struct tomoyo_number_union".
+ *
+ * Returns nothing.
*/
-static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
- const struct tomoyo_number_union *ptr)
+static void tomoyo_print_number_union_nospace
+(struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
{
- tomoyo_set_space(head);
if (ptr->group) {
tomoyo_set_string(head, "@");
tomoyo_set_string(head, ptr->group->group_name->name);
@@ -325,8 +340,8 @@ static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
"0%lo", min);
break;
default:
- tomoyo_addprintf(buffer, sizeof(buffer),
- "%lu", min);
+ tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
+ min);
break;
}
if (min == max && min_type == max_type)
@@ -340,6 +355,21 @@ static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
}
/**
+ * tomoyo_print_number_union - Print a tomoyo_number_union.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @ptr: Pointer to "struct tomoyo_number_union".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
+ const struct tomoyo_number_union *ptr)
+{
+ tomoyo_set_space(head);
+ tomoyo_print_number_union_nospace(head, ptr);
+}
+
+/**
* tomoyo_assign_profile - Create a new profile.
*
* @ns: Pointer to "struct tomoyo_policy_namespace".
@@ -1004,6 +1034,91 @@ static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
}
/**
+ * tomoyo_print_condition - Print condition part.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @cond: Pointer to "struct tomoyo_condition".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
+ const struct tomoyo_condition *cond)
+{
+ switch (head->r.cond_step) {
+ case 0:
+ head->r.cond_index = 0;
+ head->r.cond_step++;
+ /* fall through */
+ case 1:
+ {
+ const u16 condc = cond->condc;
+ const struct tomoyo_condition_element *condp =
+ (typeof(condp)) (cond + 1);
+ const struct tomoyo_number_union *numbers_p =
+ (typeof(numbers_p)) (condp + condc);
+ u16 skip;
+ for (skip = 0; skip < head->r.cond_index; skip++) {
+ const u8 left = condp->left;
+ const u8 right = condp->right;
+ condp++;
+ switch (left) {
+ case TOMOYO_NUMBER_UNION:
+ numbers_p++;
+ break;
+ }
+ switch (right) {
+ case TOMOYO_NUMBER_UNION:
+ numbers_p++;
+ break;
+ }
+ }
+ while (head->r.cond_index < condc) {
+ const u8 match = condp->equals;
+ const u8 left = condp->left;
+ const u8 right = condp->right;
+ if (!tomoyo_flush(head))
+ return false;
+ condp++;
+ head->r.cond_index++;
+ tomoyo_set_space(head);
+ switch (left) {
+ case TOMOYO_NUMBER_UNION:
+ tomoyo_print_number_union_nospace
+ (head, numbers_p++);
+ break;
+ default:
+ tomoyo_set_string(head,
+ tomoyo_condition_keyword[left]);
+ break;
+ }
+ tomoyo_set_string(head, match ? "=" : "!=");
+ switch (right) {
+ case TOMOYO_NUMBER_UNION:
+ tomoyo_print_number_union_nospace
+ (head, numbers_p++);
+ break;
+ default:
+ tomoyo_set_string(head,
+ tomoyo_condition_keyword[right]);
+ break;
+ }
+ }
+ }
+ head->r.cond_step++;
+ /* fall through */
+ case 2:
+ if (!tomoyo_flush(head))
+ break;
+ head->r.cond_step++;
+ /* fall through */
+ case 3:
+ tomoyo_set_lf(head);
+ return true;
+ }
+ return false;
+}
+
+/**
* tomoyo_set_group - Print "acl_group " header keyword and category name.
*
* @head: Pointer to "struct tomoyo_io_buffer".
@@ -1037,6 +1152,8 @@ static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
bool first = true;
u8 bit;
+ if (head->r.print_cond_part)
+ goto print_cond_part;
if (acl->is_deleted)
return true;
if (!tomoyo_flush(head))
@@ -1135,7 +1252,18 @@ static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
tomoyo_print_name_union(head, &ptr->fs_type);
tomoyo_print_number_union(head, &ptr->flags);
}
- tomoyo_set_lf(head);
+ if (acl->cond) {
+ head->r.print_cond_part = true;
+ head->r.cond_step = 0;
+ if (!tomoyo_flush(head))
+ return false;
+print_cond_part:
+ if (!tomoyo_print_condition(head, acl->cond))
+ return false;
+ head->r.print_cond_part = false;
+ } else {
+ tomoyo_set_lf(head);
+ }
return true;
}
diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index beb7d0eb522..958d433b011 100644
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -21,7 +21,8 @@
#include <linux/list.h>
#include <linux/cred.h>
#include <linux/poll.h>
-struct linux_binprm;
+#include <linux/binfmts.h>
+#include <linux/highmem.h>
/********** Constants definitions. **********/
@@ -41,6 +42,22 @@ struct linux_binprm;
/* Group number is an integer between 0 and 255. */
#define TOMOYO_MAX_ACL_GROUPS 256
+/* Index numbers for "struct tomoyo_condition". */
+enum tomoyo_conditions_index {
+ TOMOYO_TASK_UID, /* current_uid() */
+ TOMOYO_TASK_EUID, /* current_euid() */
+ TOMOYO_TASK_SUID, /* current_suid() */
+ TOMOYO_TASK_FSUID, /* current_fsuid() */
+ TOMOYO_TASK_GID, /* current_gid() */
+ TOMOYO_TASK_EGID, /* current_egid() */
+ TOMOYO_TASK_SGID, /* current_sgid() */
+ TOMOYO_TASK_FSGID, /* current_fsgid() */
+ TOMOYO_TASK_PID, /* sys_getpid() */
+ TOMOYO_TASK_PPID, /* sys_getppid() */
+ TOMOYO_MAX_CONDITION_KEYWORD,
+ TOMOYO_NUMBER_UNION,
+};
+
/* Index numbers for operation mode. */
enum tomoyo_mode_index {
TOMOYO_CONFIG_DISABLED,
@@ -61,6 +78,7 @@ enum tomoyo_policy_id {
TOMOYO_ID_TRANSITION_CONTROL,
TOMOYO_ID_AGGREGATOR,
TOMOYO_ID_MANAGER,
+ TOMOYO_ID_CONDITION,
TOMOYO_ID_NAME,
TOMOYO_ID_ACL,
TOMOYO_ID_DOMAIN,
@@ -370,9 +388,32 @@ struct tomoyo_number_group {
struct tomoyo_number_union number;
};
+/* Structure for entries which follows "struct tomoyo_condition". */
+struct tomoyo_condition_element {
+ /* Left hand operand. */
+ u8 left;
+ /* Right hand operand. */
+ u8 right;
+ /* Equation operator. True if equals or overlaps, false otherwise. */
+ bool equals;
+};
+
+/* Structure for optional arguments. */
+struct tomoyo_condition {
+ struct tomoyo_shared_acl_head head;
+ u32 size; /* Memory size allocated for this entry. */
+ u16 condc; /* Number of conditions in this struct. */
+ u16 numbers_count; /* Number of "struct tomoyo_number_union values". */
+ /*
+ * struct tomoyo_condition_element condition[condc];
+ * struct tomoyo_number_union values[numbers_count];
+ */
+};
+
/* Common header for individual entries. */
struct tomoyo_acl_info {
struct list_head list;
+ struct tomoyo_condition *cond; /* Maybe NULL. */
bool is_deleted;
u8 type; /* One of values in "enum tomoyo_acl_entry_type_index". */
} __packed;
@@ -475,12 +516,15 @@ struct tomoyo_io_buffer {
unsigned int step;
unsigned int query_index;
u16 index;
+ u16 cond_index;
u8 acl_group_index;
+ u8 cond_step;
u8 bit;
u8 w_pos;
bool eof;
bool print_this_domain_only;
bool print_transition_related_only;
+ bool print_cond_part;
const char *w[TOMOYO_MAX_IO_READ_QUEUE];
} r;
struct {
@@ -586,6 +630,8 @@ struct tomoyo_policy_namespace {
bool tomoyo_compare_number_union(const unsigned long value,
const struct tomoyo_number_union *ptr);
+bool tomoyo_condition(struct tomoyo_request_info *r,
+ const struct tomoyo_condition *cond);
bool tomoyo_correct_domain(const unsigned char *domainname);
bool tomoyo_correct_path(const char *filename);
bool tomoyo_correct_word(const char *string);
@@ -664,6 +710,7 @@ ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
const int buffer_len);
ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
const char __user *buffer, const int buffer_len);
+struct tomoyo_condition *tomoyo_get_condition(struct tomoyo_acl_param *param);
struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
const bool transit);
struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname);
@@ -675,6 +722,7 @@ struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
const u8 profile);
unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
const u8 index);
+u8 tomoyo_parse_ulong(unsigned long *result, char **str);
void *tomoyo_commit_ok(void *data, const unsigned int size);
void __init tomoyo_load_builtin_policy(void);
void __init tomoyo_mm_init(void);
@@ -683,6 +731,7 @@ void tomoyo_check_acl(struct tomoyo_request_info *r,
const struct tomoyo_acl_info *));
void tomoyo_check_profile(void);
void tomoyo_convert_time(time_t time, struct tomoyo_time *stamp);
+void tomoyo_del_condition(struct list_head *element);
void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns);
void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
@@ -706,6 +755,8 @@ void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt,
/********** External variable definitions. **********/
extern bool tomoyo_policy_loaded;
+extern const char * const tomoyo_condition_keyword
+[TOMOYO_MAX_CONDITION_KEYWORD];
extern const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS];
extern const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
+ TOMOYO_MAX_MAC_CATEGORY_INDEX];
@@ -715,6 +766,7 @@ extern const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX];
extern const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION];
extern const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION];
extern const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION];
+extern struct list_head tomoyo_condition_list;
extern struct list_head tomoyo_domain_list;
extern struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
extern struct list_head tomoyo_namespace_list;
@@ -750,6 +802,36 @@ static inline void tomoyo_read_unlock(int idx)
}
/**
+ * tomoyo_sys_getppid - Copy of getppid().
+ *
+ * Returns parent process's PID.
+ *
+ * Alpha does not have getppid() defined. To be able to build this module on
+ * Alpha, I have to copy getppid() from kernel/timer.c.
+ */
+static inline pid_t tomoyo_sys_getppid(void)
+{
+ pid_t pid;
+ rcu_read_lock();
+ pid = task_tgid_vnr(current->real_parent);
+ rcu_read_unlock();
+ return pid;
+}
+
+/**
+ * tomoyo_sys_getpid - Copy of getpid().
+ *
+ * Returns current thread's PID.
+ *
+ * Alpha does not have getpid() defined. To be able to build this module on
+ * Alpha, I have to copy getpid() from kernel/timer.c.
+ */
+static inline pid_t tomoyo_sys_getpid(void)
+{
+ return task_tgid_vnr(current);
+}
+
+/**
* tomoyo_pathcmp - strcmp() for "struct tomoyo_path_info" structure.
*
* @a: Pointer to "struct tomoyo_path_info".
@@ -780,6 +862,19 @@ static inline void tomoyo_put_name(const struct tomoyo_path_info *name)
}
/**
+ * tomoyo_put_condition - Drop reference on "struct tomoyo_condition".
+ *
+ * @cond: Pointer to "struct tomoyo_condition". Maybe NULL.
+ *
+ * Returns nothing.
+ */
+static inline void tomoyo_put_condition(struct tomoyo_condition *cond)
+{
+ if (cond)
+ atomic_dec(&cond->head.users);
+}
+
+/**
* tomoyo_put_group - Drop reference on "struct tomoyo_group".
*
* @group: Pointer to "struct tomoyo_group". Maybe NULL.
diff --git a/security/tomoyo/condition.c b/security/tomoyo/condition.c
new file mode 100644
index 00000000000..0692df3cddc
--- /dev/null
+++ b/security/tomoyo/condition.c
@@ -0,0 +1,349 @@
+/*
+ * security/tomoyo/condition.c
+ *
+ * Copyright (C) 2005-2011 NTT DATA CORPORATION
+ */
+
+#include "common.h"
+#include <linux/slab.h>
+
+/* List of "struct tomoyo_condition". */
+LIST_HEAD(tomoyo_condition_list);
+
+/**
+ * tomoyo_same_condition - Check for duplicated "struct tomoyo_condition" entry.
+ *
+ * @a: Pointer to "struct tomoyo_condition".
+ * @b: Pointer to "struct tomoyo_condition".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static inline bool tomoyo_same_condition(const struct tomoyo_condition *a,
+ const struct tomoyo_condition *b)
+{
+ return a->size == b->size && a->condc == b->condc &&
+ a->numbers_count == b->numbers_count &&
+ !memcmp(a + 1, b + 1, a->size - sizeof(*a));
+}
+
+/**
+ * tomoyo_condition_type - Get condition type.
+ *
+ * @word: Keyword string.
+ *
+ * Returns one of values in "enum tomoyo_conditions_index" on success,
+ * TOMOYO_MAX_CONDITION_KEYWORD otherwise.
+ */
+static u8 tomoyo_condition_type(const char *word)
+{
+ u8 i;
+ for (i = 0; i < TOMOYO_MAX_CONDITION_KEYWORD; i++) {
+ if (!strcmp(word, tomoyo_condition_keyword[i]))
+ break;
+ }
+ return i;
+}
+
+/* Define this to enable debug mode. */
+/* #define DEBUG_CONDITION */
+
+#ifdef DEBUG_CONDITION
+#define dprintk printk
+#else
+#define dprintk(...) do { } while (0)
+#endif
+
+/**
+ * tomoyo_commit_condition - Commit "struct tomoyo_condition".
+ *
+ * @entry: Pointer to "struct tomoyo_condition".
+ *
+ * Returns pointer to "struct tomoyo_condition" on success, NULL otherwise.
+ *
+ * This function merges duplicated entries. This function returns NULL if
+ * @entry is not duplicated but memory quota for policy has exceeded.
+ */
+static struct tomoyo_condition *tomoyo_commit_condition
+(struct tomoyo_condition *entry)
+{
+ struct tomoyo_condition *ptr;
+ bool found = false;
+ if (mutex_lock_interruptible(&tomoyo_policy_lock)) {
+ dprintk(KERN_WARNING "%u: %s failed\n", __LINE__, __func__);
+ ptr = NULL;
+ found = true;
+ goto out;
+ }
+ list_for_each_entry_rcu(ptr, &tomoyo_condition_list, head.list) {
+ if (!tomoyo_same_condition(ptr, entry))
+ continue;
+ /* Same entry found. Share this entry. */
+ atomic_inc(&ptr->head.users);
+ found = true;
+ break;
+ }
+ if (!found) {
+ if (tomoyo_memory_ok(entry)) {
+ atomic_set(&entry->head.users, 1);
+ list_add_rcu(&entry->head.list,
+ &tomoyo_condition_list);
+ } else {
+ found = true;
+ ptr = NULL;
+ }
+ }
+ mutex_unlock(&tomoyo_policy_lock);
+out:
+ if (found) {
+ tomoyo_del_condition(&entry->head.list);
+ kfree(entry);
+ entry = ptr;
+ }
+ return entry;
+}
+
+/**
+ * tomoyo_get_condition - Parse condition part.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns pointer to "struct tomoyo_condition" on success, NULL otherwise.
+ */
+struct tomoyo_condition *tomoyo_get_condition(struct tomoyo_acl_param *param)
+{
+ struct tomoyo_condition *entry = NULL;
+ struct tomoyo_condition_element *condp = NULL;
+ struct tomoyo_number_union *numbers_p = NULL;
+ struct tomoyo_condition e = { };
+ char * const start_of_string = param->data;
+ char * const end_of_string = start_of_string + strlen(start_of_string);
+ char *pos;
+rerun:
+ pos = start_of_string;
+ while (1) {
+ u8 left = -1;
+ u8 right = -1;
+ char *left_word = pos;
+ char *cp;
+ char *right_word;
+ bool is_not;
+ if (!*left_word)
+ break;
+ /*
+ * Since left-hand condition does not allow use of "path_group"
+ * or "number_group" and environment variable's names do not
+ * accept '=', it is guaranteed that the original line consists
+ * of one or more repetition of $left$operator$right blocks
+ * where "$left is free from '=' and ' '" and "$operator is
+ * either '=' or '!='" and "$right is free from ' '".
+ * Therefore, we can reconstruct the original line at the end
+ * of dry run even if we overwrite $operator with '\0'.
+ */
+ cp = strchr(pos, ' ');
+ if (cp) {
+ *cp = '\0'; /* Will restore later. */
+ pos = cp + 1;
+ } else {
+ pos = "";
+ }
+ right_word = strchr(left_word, '=');
+ if (!right_word || right_word == left_word)
+ goto out;
+ is_not = *(right_word - 1) == '!';
+ if (is_not)
+ *(right_word++ - 1) = '\0'; /* Will restore later. */
+ else if (*(right_word + 1) != '=')
+ *right_word++ = '\0'; /* Will restore later. */
+ else
+ goto out;
+ dprintk(KERN_WARNING "%u: <%s>%s=<%s>\n", __LINE__, left_word,
+ is_not ? "!" : "", right_word);
+ left = tomoyo_condition_type(left_word);
+ dprintk(KERN_WARNING "%u: <%s> left=%u\n", __LINE__, left_word,
+ left);
+ if (left == TOMOYO_MAX_CONDITION_KEYWORD) {
+ if (!numbers_p) {
+ e.numbers_count++;
+ } else {
+ e.numbers_count--;
+ left = TOMOYO_NUMBER_UNION;
+ param->data = left_word;
+ if (*left_word == '@' ||
+ !tomoyo_parse_number_union(param,
+ numbers_p++))
+ goto out;
+ }
+ }
+ if (!condp)
+ e.condc++;
+ else
+ e.condc--;
+ right = tomoyo_condition_type(right_word);
+ if (right == TOMOYO_MAX_CONDITION_KEYWORD) {
+ if (!numbers_p) {
+ e.numbers_count++;
+ } else {
+ e.numbers_count--;
+ right = TOMOYO_NUMBER_UNION;
+ param->data = right_word;
+ if (!tomoyo_parse_number_union(param,
+ numbers_p++))
+ goto out;
+ }
+ }
+ if (!condp) {
+ dprintk(KERN_WARNING "%u: dry_run left=%u right=%u "
+ "match=%u\n", __LINE__, left, right, !is_not);
+ continue;
+ }
+ condp->left = left;
+ condp->right = right;
+ condp->equals = !is_not;
+ dprintk(KERN_WARNING "%u: left=%u right=%u match=%u\n",
+ __LINE__, condp->left, condp->right,
+ condp->equals);
+ condp++;
+ }
+ dprintk(KERN_INFO "%u: cond=%u numbers=%u\n",
+ __LINE__, e.condc, e.numbers_count);
+ if (entry) {
+ BUG_ON(e.numbers_count | e.condc);
+ return tomoyo_commit_condition(entry);
+ }
+ e.size = sizeof(*entry)
+ + e.condc * sizeof(struct tomoyo_condition_element)
+ + e.numbers_count * sizeof(struct tomoyo_number_union);
+ entry = kzalloc(e.size, GFP_NOFS);
+ if (!entry)
+ return NULL;
+ *entry = e;
+ condp = (struct tomoyo_condition_element *) (entry + 1);
+ numbers_p = (struct tomoyo_number_union *) (condp + e.condc);
+ {
+ bool flag = false;
+ for (pos = start_of_string; pos < end_of_string; pos++) {
+ if (*pos)
+ continue;
+ if (flag) /* Restore " ". */
+ *pos = ' ';
+ else if (*(pos + 1) == '=') /* Restore "!=". */
+ *pos = '!';
+ else /* Restore "=". */
+ *pos = '=';
+ flag = !flag;
+ }
+ }
+ goto rerun;
+out:
+ dprintk(KERN_WARNING "%u: %s failed\n", __LINE__, __func__);
+ if (entry) {
+ tomoyo_del_condition(&entry->head.list);
+ kfree(entry);
+ }
+ return NULL;
+}
+
+/**
+ * tomoyo_condition - Check condition part.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ * @cond: Pointer to "struct tomoyo_condition". Maybe NULL.
+ *
+ * Returns true on success, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+bool tomoyo_condition(struct tomoyo_request_info *r,
+ const struct tomoyo_condition *cond)
+{
+ u32 i;
+ unsigned long min_v[2] = { 0, 0 };
+ unsigned long max_v[2] = { 0, 0 };
+ const struct tomoyo_condition_element *condp;
+ const struct tomoyo_number_union *numbers_p;
+ u16 condc;
+ if (!cond)
+ return true;
+ condc = cond->condc;
+ condp = (struct tomoyo_condition_element *) (cond + 1);
+ numbers_p = (const struct tomoyo_number_union *) (condp + condc);
+ for (i = 0; i < condc; i++) {
+ const bool match = condp->equals;
+ const u8 left = condp->left;
+ const u8 right = condp->right;
+ u8 j;
+ condp++;
+ /* Check numeric or bit-op expressions. */
+ for (j = 0; j < 2; j++) {
+ const u8 index = j ? right : left;
+ unsigned long value = 0;
+ switch (index) {
+ case TOMOYO_TASK_UID:
+ value = current_uid();
+ break;
+ case TOMOYO_TASK_EUID:
+ value = current_euid();
+ break;
+ case TOMOYO_TASK_SUID:
+ value = current_suid();
+ break;
+ case TOMOYO_TASK_FSUID:
+ value = current_fsuid();
+ break;
+ case TOMOYO_TASK_GID:
+ value = current_gid();
+ break;
+ case TOMOYO_TASK_EGID:
+ value = current_egid();
+ break;
+ case TOMOYO_TASK_SGID:
+ value = current_sgid();
+ break;
+ case TOMOYO_TASK_FSGID:
+ value = current_fsgid();
+ break;
+ case TOMOYO_TASK_PID:
+ value = tomoyo_sys_getpid();
+ break;
+ case TOMOYO_TASK_PPID:
+ value = tomoyo_sys_getppid();
+ break;
+ case TOMOYO_NUMBER_UNION:
+ /* Fetch values later. */
+ break;
+ default:
+ break;
+ }
+ max_v[j] = value;
+ min_v[j] = value;
+ }
+ if (left == TOMOYO_NUMBER_UNION) {
+ /* Fetch values now. */
+ const struct tomoyo_number_union *ptr = numbers_p++;
+ min_v[0] = ptr->values[0];
+ max_v[0] = ptr->values[1];
+ }
+ if (right == TOMOYO_NUMBER_UNION) {
+ /* Fetch values now. */
+ const struct tomoyo_number_union *ptr = numbers_p++;
+ if (ptr->group) {
+ if (tomoyo_number_matches_group(min_v[0],
+ max_v[0],
+ ptr->group)
+ == match)
+ continue;
+ } else {
+ if ((min_v[0] <= ptr->values[1] &&
+ max_v[0] >= ptr->values[0]) == match)
+ continue;
+ }
+ goto out;
+ }
+ /* Normal value range comparison. */
+ if ((min_v[0] <= max_v[1] && max_v[0] >= min_v[1]) == match)
+ continue;
+out:
+ return false;
+ }
+ return true;
+}
diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c
index 7893127d877..0f02c785209 100644
--- a/security/tomoyo/domain.c
+++ b/security/tomoyo/domain.c
@@ -69,7 +69,7 @@ int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size,
static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a,
const struct tomoyo_acl_info *b)
{
- return a->type == b->type;
+ return a->type == b->type && a->cond == b->cond;
}
/**
@@ -100,8 +100,13 @@ int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size,
struct tomoyo_acl_info *entry;
struct list_head * const list = param->list;
+ if (param->data[0]) {
+ new_entry->cond = tomoyo_get_condition(param);
+ if (!new_entry->cond)
+ return -EINVAL;
+ }
if (mutex_lock_interruptible(&tomoyo_policy_lock))
- return error;
+ goto out;
list_for_each_entry_rcu(entry, list, list) {
if (!tomoyo_same_acl_head(entry, new_entry) ||
!check_duplicate(entry, new_entry))
@@ -122,6 +127,8 @@ int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size,
}
}
mutex_unlock(&tomoyo_policy_lock);
+out:
+ tomoyo_put_condition(new_entry->cond);
return error;
}
@@ -148,10 +155,12 @@ retry:
list_for_each_entry_rcu(ptr, list, list) {
if (ptr->is_deleted || ptr->type != r->param_type)
continue;
- if (check_entry(r, ptr)) {
- r->granted = true;
- return;
- }
+ if (!check_entry(r, ptr))
+ continue;
+ if (!tomoyo_condition(r, ptr->cond))
+ continue;
+ r->granted = true;
+ return;
}
if (!retried) {
retried = true;
diff --git a/security/tomoyo/gc.c b/security/tomoyo/gc.c
index 1e1a6c8c832..21fccd67c25 100644
--- a/security/tomoyo/gc.c
+++ b/security/tomoyo/gc.c
@@ -25,6 +25,7 @@ static const u8 tomoyo_element_size[TOMOYO_MAX_POLICY] = {
[TOMOYO_ID_TRANSITION_CONTROL] =
sizeof(struct tomoyo_transition_control),
[TOMOYO_ID_MANAGER] = sizeof(struct tomoyo_manager),
+ /* [TOMOYO_ID_CONDITION] = "struct tomoyo_condition"->size, */
/* [TOMOYO_ID_NAME] = "struct tomoyo_name"->size, */
/* [TOMOYO_ID_ACL] =
tomoyo_acl_size["struct tomoyo_acl_info"->type], */
@@ -162,6 +163,10 @@ static bool tomoyo_add_to_gc(const int type, struct list_head *element)
entry->size = strlen(container_of(element,
typeof(struct tomoyo_name),
head.list)->entry.name) + 1;
+ else if (type == TOMOYO_ID_CONDITION)
+ entry->size =
+ container_of(element, typeof(struct tomoyo_condition),
+ head.list)->size;
else
entry->size = tomoyo_element_size[type];
entry->element = element;
@@ -246,6 +251,7 @@ static void tomoyo_del_acl(struct list_head *element)
{
struct tomoyo_acl_info *acl =
container_of(element, typeof(*acl), list);
+ tomoyo_put_condition(acl->cond);
switch (acl->type) {
case TOMOYO_TYPE_PATH_ACL:
{
@@ -338,6 +344,27 @@ static bool tomoyo_del_domain(struct list_head *element)
return true;
}
+/**
+ * tomoyo_del_condition - Delete members in "struct tomoyo_condition".
+ *
+ * @element: Pointer to "struct list_head".
+ *
+ * Returns nothing.
+ */
+void tomoyo_del_condition(struct list_head *element)
+{
+ struct tomoyo_condition *cond = container_of(element, typeof(*cond),
+ head.list);
+ const u16 condc = cond->condc;
+ const u16 numbers_count = cond->numbers_count;
+ unsigned int i;
+ const struct tomoyo_condition_element *condp
+ = (const struct tomoyo_condition_element *) (cond + 1);
+ struct tomoyo_number_union *numbers_p
+ = (struct tomoyo_number_union *) (condp + condc);
+ for (i = 0; i < numbers_count; i++)
+ tomoyo_put_number_union(numbers_p++);
+}
/**
* tomoyo_del_name - Delete members in "struct tomoyo_name".
@@ -494,15 +521,18 @@ static void tomoyo_collect_entry(void)
}
}
}
- for (i = 0; i < TOMOYO_MAX_HASH; i++) {
- struct list_head *list = &tomoyo_name_list[i];
+ id = TOMOYO_ID_CONDITION;
+ for (i = 0; i < TOMOYO_MAX_HASH + 1; i++) {
+ struct list_head *list = !i ?
+ &tomoyo_condition_list : &tomoyo_name_list[i - 1];
struct tomoyo_shared_acl_head *ptr;
list_for_each_entry(ptr, list, list) {
if (atomic_read(&ptr->users))
continue;
- if (!tomoyo_add_to_gc(TOMOYO_ID_NAME, &ptr->list))
+ if (!tomoyo_add_to_gc(id, &ptr->list))
goto unlock;
}
+ id = TOMOYO_ID_NAME;
}
unlock:
tomoyo_read_unlock(idx);
@@ -557,6 +587,9 @@ static bool tomoyo_kfree_entry(void)
case TOMOYO_ID_MANAGER:
tomoyo_del_manager(element);
break;
+ case TOMOYO_ID_CONDITION:
+ tomoyo_del_condition(element);
+ break;
case TOMOYO_ID_NAME:
/*
* Thirdly, defer until all "struct tomoyo_io_buffer"
diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c
index 7ff54c95e1f..e25f7ffd5ba 100644
--- a/security/tomoyo/util.c
+++ b/security/tomoyo/util.c
@@ -138,7 +138,7 @@ char *tomoyo_read_token(struct tomoyo_acl_param *param)
* The @src is updated to point the first character after the value
* on success.
*/
-static u8 tomoyo_parse_ulong(unsigned long *result, char **str)
+u8 tomoyo_parse_ulong(unsigned long *result, char **str)
{
const char *cp = *str;
char *ep;