| /* |
| * security/tomoyo/common.c |
| * |
| * Common functions for TOMOYO. |
| * |
| * Copyright (C) 2005-2010 NTT DATA CORPORATION |
| */ |
| |
| #include <linux/uaccess.h> |
| #include <linux/slab.h> |
| #include <linux/security.h> |
| #include "common.h" |
| |
| /* String table for operation mode. */ |
| const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = { |
| [TOMOYO_CONFIG_DISABLED] = "disabled", |
| [TOMOYO_CONFIG_LEARNING] = "learning", |
| [TOMOYO_CONFIG_PERMISSIVE] = "permissive", |
| [TOMOYO_CONFIG_ENFORCING] = "enforcing" |
| }; |
| |
| /* String table for /sys/kernel/security/tomoyo/profile */ |
| static const char *tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX |
| + TOMOYO_MAX_MAC_CATEGORY_INDEX] = { |
| [TOMOYO_MAC_FILE_EXECUTE] = "file::execute", |
| [TOMOYO_MAC_FILE_OPEN] = "file::open", |
| [TOMOYO_MAC_FILE_CREATE] = "file::create", |
| [TOMOYO_MAC_FILE_UNLINK] = "file::unlink", |
| [TOMOYO_MAC_FILE_GETATTR] = "file::getattr", |
| [TOMOYO_MAC_FILE_MKDIR] = "file::mkdir", |
| [TOMOYO_MAC_FILE_RMDIR] = "file::rmdir", |
| [TOMOYO_MAC_FILE_MKFIFO] = "file::mkfifo", |
| [TOMOYO_MAC_FILE_MKSOCK] = "file::mksock", |
| [TOMOYO_MAC_FILE_TRUNCATE] = "file::truncate", |
| [TOMOYO_MAC_FILE_SYMLINK] = "file::symlink", |
| [TOMOYO_MAC_FILE_MKBLOCK] = "file::mkblock", |
| [TOMOYO_MAC_FILE_MKCHAR] = "file::mkchar", |
| [TOMOYO_MAC_FILE_LINK] = "file::link", |
| [TOMOYO_MAC_FILE_RENAME] = "file::rename", |
| [TOMOYO_MAC_FILE_CHMOD] = "file::chmod", |
| [TOMOYO_MAC_FILE_CHOWN] = "file::chown", |
| [TOMOYO_MAC_FILE_CHGRP] = "file::chgrp", |
| [TOMOYO_MAC_FILE_IOCTL] = "file::ioctl", |
| [TOMOYO_MAC_FILE_CHROOT] = "file::chroot", |
| [TOMOYO_MAC_FILE_MOUNT] = "file::mount", |
| [TOMOYO_MAC_FILE_UMOUNT] = "file::unmount", |
| [TOMOYO_MAC_FILE_PIVOT_ROOT] = "file::pivot_root", |
| [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file", |
| }; |
| |
| /* String table for PREFERENCE keyword. */ |
| static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = { |
| [TOMOYO_PREF_MAX_AUDIT_LOG] = "max_audit_log", |
| [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry", |
| }; |
| |
| /* Permit policy management by non-root user? */ |
| static bool tomoyo_manage_by_non_root; |
| |
| /* Utility functions. */ |
| |
| /** |
| * tomoyo_yesno - Return "yes" or "no". |
| * |
| * @value: Bool value. |
| */ |
| const char *tomoyo_yesno(const unsigned int value) |
| { |
| return value ? "yes" : "no"; |
| } |
| |
| /** |
| * tomoyo_addprintf - strncat()-like-snprintf(). |
| * |
| * @buffer: Buffer to write to. Must be '\0'-terminated. |
| * @len: Size of @buffer. |
| * @fmt: The printf()'s format string, followed by parameters. |
| * |
| * Returns nothing. |
| */ |
| static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...) |
| { |
| va_list args; |
| const int pos = strlen(buffer); |
| va_start(args, fmt); |
| vsnprintf(buffer + pos, len - pos - 1, fmt, args); |
| va_end(args); |
| } |
| |
| /** |
| * tomoyo_flush - Flush queued string to userspace's buffer. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns true if all data was flushed, false otherwise. |
| */ |
| static bool tomoyo_flush(struct tomoyo_io_buffer *head) |
| { |
| while (head->r.w_pos) { |
| const char *w = head->r.w[0]; |
| int len = strlen(w); |
| if (len) { |
| if (len > head->read_user_buf_avail) |
| len = head->read_user_buf_avail; |
| if (!len) |
| return false; |
| if (copy_to_user(head->read_user_buf, w, len)) |
| return false; |
| head->read_user_buf_avail -= len; |
| head->read_user_buf += len; |
| w += len; |
| } |
| head->r.w[0] = w; |
| if (*w) |
| return false; |
| /* Add '\0' for audit logs and query. */ |
| if (head->poll) { |
| if (!head->read_user_buf_avail || |
| copy_to_user(head->read_user_buf, "", 1)) |
| return false; |
| head->read_user_buf_avail--; |
| head->read_user_buf++; |
| } |
| head->r.w_pos--; |
| for (len = 0; len < head->r.w_pos; len++) |
| head->r.w[len] = head->r.w[len + 1]; |
| } |
| head->r.avail = 0; |
| return true; |
| } |
| |
| /** |
| * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * @string: String to print. |
| * |
| * Note that @string has to be kept valid until @head is kfree()d. |
| * This means that char[] allocated on stack memory cannot be passed to |
| * this function. Use tomoyo_io_printf() for char[] allocated on stack memory. |
| */ |
| static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string) |
| { |
| if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) { |
| head->r.w[head->r.w_pos++] = string; |
| tomoyo_flush(head); |
| } else |
| WARN_ON(1); |
| } |
| |
| /** |
| * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * @fmt: The printf()'s format string, followed by parameters. |
| */ |
| void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...) |
| { |
| va_list args; |
| int len; |
| int pos = head->r.avail; |
| int size = head->readbuf_size - pos; |
| if (size <= 0) |
| return; |
| va_start(args, fmt); |
| len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1; |
| va_end(args); |
| if (pos + len >= head->readbuf_size) { |
| WARN_ON(1); |
| return; |
| } |
| head->r.avail += len; |
| tomoyo_set_string(head, head->read_buf + pos); |
| } |
| |
| /** |
| * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns nothing. |
| */ |
| static void tomoyo_set_space(struct tomoyo_io_buffer *head) |
| { |
| tomoyo_set_string(head, " "); |
| } |
| |
| /** |
| * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns nothing. |
| */ |
| static bool tomoyo_set_lf(struct tomoyo_io_buffer *head) |
| { |
| tomoyo_set_string(head, "\n"); |
| return !head->r.w_pos; |
| } |
| |
| /** |
| * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns nothing. |
| */ |
| static void tomoyo_set_slash(struct tomoyo_io_buffer *head) |
| { |
| tomoyo_set_string(head, "/"); |
| } |
| |
| /* List of namespaces. */ |
| LIST_HEAD(tomoyo_namespace_list); |
| /* True if namespace other than tomoyo_kernel_namespace is defined. */ |
| static bool tomoyo_namespace_enabled; |
| |
| /** |
| * tomoyo_init_policy_namespace - Initialize namespace. |
| * |
| * @ns: Pointer to "struct tomoyo_policy_namespace". |
| * |
| * Returns nothing. |
| */ |
| void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns) |
| { |
| unsigned int idx; |
| for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++) |
| INIT_LIST_HEAD(&ns->acl_group[idx]); |
| for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++) |
| INIT_LIST_HEAD(&ns->group_list[idx]); |
| for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++) |
| INIT_LIST_HEAD(&ns->policy_list[idx]); |
| ns->profile_version = 20100903; |
| tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list); |
| list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list); |
| } |
| |
| /** |
| * tomoyo_print_namespace - Print namespace header. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns nothing. |
| */ |
| static void tomoyo_print_namespace(struct tomoyo_io_buffer *head) |
| { |
| if (!tomoyo_namespace_enabled) |
| return; |
| tomoyo_set_string(head, |
| container_of(head->r.ns, |
| struct tomoyo_policy_namespace, |
| namespace_list)->name); |
| tomoyo_set_space(head); |
| } |
| |
| /** |
| * tomoyo_print_name_union - Print a tomoyo_name_union. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * @ptr: Pointer to "struct tomoyo_name_union". |
| */ |
| static void tomoyo_print_name_union(struct tomoyo_io_buffer *head, |
| const struct tomoyo_name_union *ptr) |
| { |
| tomoyo_set_space(head); |
| if (ptr->group) { |
| tomoyo_set_string(head, "@"); |
| tomoyo_set_string(head, ptr->group->group_name->name); |
| } else { |
| tomoyo_set_string(head, ptr->filename->name); |
| } |
| } |
| |
| /** |
| * tomoyo_print_number_union - Print a tomoyo_number_union. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * @ptr: Pointer to "struct tomoyo_number_union". |
| */ |
| static void tomoyo_print_number_union(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); |
| } else { |
| int i; |
| unsigned long min = ptr->values[0]; |
| const unsigned long max = ptr->values[1]; |
| u8 min_type = ptr->value_type[0]; |
| const u8 max_type = ptr->value_type[1]; |
| char buffer[128]; |
| buffer[0] = '\0'; |
| for (i = 0; i < 2; i++) { |
| switch (min_type) { |
| case TOMOYO_VALUE_TYPE_HEXADECIMAL: |
| tomoyo_addprintf(buffer, sizeof(buffer), |
| "0x%lX", min); |
| break; |
| case TOMOYO_VALUE_TYPE_OCTAL: |
| tomoyo_addprintf(buffer, sizeof(buffer), |
| "0%lo", min); |
| break; |
| default: |
| tomoyo_addprintf(buffer, sizeof(buffer), |
| "%lu", min); |
| break; |
| } |
| if (min == max && min_type == max_type) |
| break; |
| tomoyo_addprintf(buffer, sizeof(buffer), "-"); |
| min_type = max_type; |
| min = max; |
| } |
| tomoyo_io_printf(head, "%s", buffer); |
| } |
| } |
| |
| /** |
| * tomoyo_assign_profile - Create a new profile. |
| * |
| * @ns: Pointer to "struct tomoyo_policy_namespace". |
| * @profile: Profile number to create. |
| * |
| * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise. |
| */ |
| static struct tomoyo_profile *tomoyo_assign_profile |
| (struct tomoyo_policy_namespace *ns, const unsigned int profile) |
| { |
| struct tomoyo_profile *ptr; |
| struct tomoyo_profile *entry; |
| if (profile >= TOMOYO_MAX_PROFILES) |
| return NULL; |
| ptr = ns->profile_ptr[profile]; |
| if (ptr) |
| return ptr; |
| entry = kzalloc(sizeof(*entry), GFP_NOFS); |
| if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
| goto out; |
| ptr = ns->profile_ptr[profile]; |
| if (!ptr && tomoyo_memory_ok(entry)) { |
| ptr = entry; |
| ptr->default_config = TOMOYO_CONFIG_DISABLED | |
| TOMOYO_CONFIG_WANT_GRANT_LOG | |
| TOMOYO_CONFIG_WANT_REJECT_LOG; |
| memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT, |
| sizeof(ptr->config)); |
| ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] = 1024; |
| ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] = 2048; |
| mb(); /* Avoid out-of-order execution. */ |
| ns->profile_ptr[profile] = ptr; |
| entry = NULL; |
| } |
| mutex_unlock(&tomoyo_policy_lock); |
| out: |
| kfree(entry); |
| return ptr; |
| } |
| |
| /** |
| * tomoyo_profile - Find a profile. |
| * |
| * @ns: Pointer to "struct tomoyo_policy_namespace". |
| * @profile: Profile number to find. |
| * |
| * Returns pointer to "struct tomoyo_profile". |
| */ |
| struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns, |
| const u8 profile) |
| { |
| static struct tomoyo_profile tomoyo_null_profile; |
| struct tomoyo_profile *ptr = ns->profile_ptr[profile]; |
| if (!ptr) |
| ptr = &tomoyo_null_profile; |
| return ptr; |
| } |
| |
| /** |
| * tomoyo_find_yesno - Find values for specified keyword. |
| * |
| * @string: String to check. |
| * @find: Name of keyword. |
| * |
| * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise. |
| */ |
| static s8 tomoyo_find_yesno(const char *string, const char *find) |
| { |
| const char *cp = strstr(string, find); |
| if (cp) { |
| cp += strlen(find); |
| if (!strncmp(cp, "=yes", 4)) |
| return 1; |
| else if (!strncmp(cp, "=no", 3)) |
| return 0; |
| } |
| return -1; |
| } |
| |
| /** |
| * tomoyo_set_uint - Set value for specified preference. |
| * |
| * @i: Pointer to "unsigned int". |
| * @string: String to check. |
| * @find: Name of keyword. |
| * |
| * Returns nothing. |
| */ |
| static void tomoyo_set_uint(unsigned int *i, const char *string, |
| const char *find) |
| { |
| const char *cp = strstr(string, find); |
| if (cp) |
| sscanf(cp + strlen(find), "=%u", i); |
| } |
| |
| /** |
| * tomoyo_set_mode - Set mode for specified profile. |
| * |
| * @name: Name of functionality. |
| * @value: Mode for @name. |
| * @profile: Pointer to "struct tomoyo_profile". |
| * |
| * Returns 0 on success, negative value otherwise. |
| */ |
| static int tomoyo_set_mode(char *name, const char *value, |
| struct tomoyo_profile *profile) |
| { |
| u8 i; |
| u8 config; |
| if (!strcmp(name, "CONFIG")) { |
| i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; |
| config = profile->default_config; |
| } else if (tomoyo_str_starts(&name, "CONFIG::")) { |
| config = 0; |
| for (i = 0; i < TOMOYO_MAX_MAC_INDEX |
| + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) { |
| if (strcmp(name, tomoyo_mac_keywords[i])) |
| continue; |
| config = profile->config[i]; |
| break; |
| } |
| if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) |
| return -EINVAL; |
| } else { |
| return -EINVAL; |
| } |
| if (strstr(value, "use_default")) { |
| config = TOMOYO_CONFIG_USE_DEFAULT; |
| } else { |
| u8 mode; |
| for (mode = 0; mode < 4; mode++) |
| if (strstr(value, tomoyo_mode[mode])) |
| /* |
| * Update lower 3 bits in order to distinguish |
| * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'. |
| */ |
| config = (config & ~7) | mode; |
| if (config != TOMOYO_CONFIG_USE_DEFAULT) { |
| switch (tomoyo_find_yesno(value, "grant_log")) { |
| case 1: |
| config |= TOMOYO_CONFIG_WANT_GRANT_LOG; |
| break; |
| case 0: |
| config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG; |
| break; |
| } |
| switch (tomoyo_find_yesno(value, "reject_log")) { |
| case 1: |
| config |= TOMOYO_CONFIG_WANT_REJECT_LOG; |
| break; |
| case 0: |
| config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG; |
| break; |
| } |
| } |
| } |
| if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) |
| profile->config[i] = config; |
| else if (config != TOMOYO_CONFIG_USE_DEFAULT) |
| profile->default_config = config; |
| return 0; |
| } |
| |
| /** |
| * tomoyo_write_profile - Write profile table. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns 0 on success, negative value otherwise. |
| */ |
| static int tomoyo_write_profile(struct tomoyo_io_buffer *head) |
| { |
| char *data = head->write_buf; |
| unsigned int i; |
| char *cp; |
| struct tomoyo_profile *profile; |
| if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version) |
| == 1) |
| return 0; |
| i = simple_strtoul(data, &cp, 10); |
| if (*cp != '-') |
| return -EINVAL; |
| data = cp + 1; |
| profile = tomoyo_assign_profile(head->w.ns, i); |
| if (!profile) |
| return -EINVAL; |
| cp = strchr(data, '='); |
| if (!cp) |
| return -EINVAL; |
| *cp++ = '\0'; |
| if (!strcmp(data, "COMMENT")) { |
| static DEFINE_SPINLOCK(lock); |
| const struct tomoyo_path_info *new_comment |
| = tomoyo_get_name(cp); |
| const struct tomoyo_path_info *old_comment; |
| if (!new_comment) |
| return -ENOMEM; |
| spin_lock(&lock); |
| old_comment = profile->comment; |
| profile->comment = new_comment; |
| spin_unlock(&lock); |
| tomoyo_put_name(old_comment); |
| return 0; |
| } |
| if (!strcmp(data, "PREFERENCE")) { |
| for (i = 0; i < TOMOYO_MAX_PREF; i++) |
| tomoyo_set_uint(&profile->pref[i], cp, |
| tomoyo_pref_keywords[i]); |
| return 0; |
| } |
| return tomoyo_set_mode(data, cp, profile); |
| } |
| |
| /** |
| * tomoyo_print_config - Print mode for specified functionality. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * @config: Mode for that functionality. |
| * |
| * Returns nothing. |
| * |
| * Caller prints functionality's name. |
| */ |
| static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config) |
| { |
| tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n", |
| tomoyo_mode[config & 3], |
| tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG), |
| tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG)); |
| } |
| |
| /** |
| * tomoyo_read_profile - Read profile table. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns nothing. |
| */ |
| static void tomoyo_read_profile(struct tomoyo_io_buffer *head) |
| { |
| u8 index; |
| struct tomoyo_policy_namespace *ns = |
| container_of(head->r.ns, typeof(*ns), namespace_list); |
| const struct tomoyo_profile *profile; |
| if (head->r.eof) |
| return; |
| next: |
| index = head->r.index; |
| profile = ns->profile_ptr[index]; |
| switch (head->r.step) { |
| case 0: |
| tomoyo_print_namespace(head); |
| tomoyo_io_printf(head, "PROFILE_VERSION=%u\n", |
| ns->profile_version); |
| head->r.step++; |
| break; |
| case 1: |
| for ( ; head->r.index < TOMOYO_MAX_PROFILES; |
| head->r.index++) |
| if (ns->profile_ptr[head->r.index]) |
| break; |
| if (head->r.index == TOMOYO_MAX_PROFILES) |
| return; |
| head->r.step++; |
| break; |
| case 2: |
| { |
| u8 i; |
| const struct tomoyo_path_info *comment = |
| profile->comment; |
| tomoyo_print_namespace(head); |
| tomoyo_io_printf(head, "%u-COMMENT=", index); |
| tomoyo_set_string(head, comment ? comment->name : ""); |
| tomoyo_set_lf(head); |
| tomoyo_io_printf(head, "%u-PREFERENCE={ ", index); |
| for (i = 0; i < TOMOYO_MAX_PREF; i++) |
| tomoyo_io_printf(head, "%s=%u ", |
| tomoyo_pref_keywords[i], |
| profile->pref[i]); |
| tomoyo_set_string(head, "}\n"); |
| head->r.step++; |
| } |
| break; |
| case 3: |
| { |
| tomoyo_print_namespace(head); |
| tomoyo_io_printf(head, "%u-%s", index, "CONFIG"); |
| tomoyo_print_config(head, profile->default_config); |
| head->r.bit = 0; |
| head->r.step++; |
| } |
| break; |
| case 4: |
| for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX |
| + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) { |
| const u8 i = head->r.bit; |
| const u8 config = profile->config[i]; |
| if (config == TOMOYO_CONFIG_USE_DEFAULT) |
| continue; |
| tomoyo_print_namespace(head); |
| tomoyo_io_printf(head, "%u-%s%s", index, "CONFIG::", |
| tomoyo_mac_keywords[i]); |
| tomoyo_print_config(head, config); |
| head->r.bit++; |
| break; |
| } |
| if (head->r.bit == TOMOYO_MAX_MAC_INDEX |
| + TOMOYO_MAX_MAC_CATEGORY_INDEX) { |
| head->r.index++; |
| head->r.step = 1; |
| } |
| break; |
| } |
| if (tomoyo_flush(head)) |
| goto next; |
| } |
| |
| static bool tomoyo_same_manager(const struct tomoyo_acl_head *a, |
| const struct tomoyo_acl_head *b) |
| { |
| return container_of(a, struct tomoyo_manager, head)->manager == |
| container_of(b, struct tomoyo_manager, head)->manager; |
| } |
| |
| /** |
| * tomoyo_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. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static int tomoyo_update_manager_entry(const char *manager, |
| const bool is_delete) |
| { |
| struct tomoyo_manager e = { }; |
| struct tomoyo_acl_param param = { |
| /* .ns = &tomoyo_kernel_namespace, */ |
| .is_delete = is_delete, |
| .list = &tomoyo_kernel_namespace. |
| policy_list[TOMOYO_ID_MANAGER], |
| }; |
| int error = is_delete ? -ENOENT : -ENOMEM; |
| if (tomoyo_domain_def(manager)) { |
| if (!tomoyo_correct_domain(manager)) |
| return -EINVAL; |
| e.is_domain = true; |
| } else { |
| if (!tomoyo_correct_path(manager)) |
| return -EINVAL; |
| } |
| e.manager = tomoyo_get_name(manager); |
| if (e.manager) { |
| error = tomoyo_update_policy(&e.head, sizeof(e), ¶m, |
| tomoyo_same_manager); |
| tomoyo_put_name(e.manager); |
| } |
| return error; |
| } |
| |
| /** |
| * tomoyo_write_manager - Write manager policy. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static int tomoyo_write_manager(struct tomoyo_io_buffer *head) |
| { |
| char *data = head->write_buf; |
| |
| if (!strcmp(data, "manage_by_non_root")) { |
| tomoyo_manage_by_non_root = !head->w.is_delete; |
| return 0; |
| } |
| return tomoyo_update_manager_entry(data, head->w.is_delete); |
| } |
| |
| /** |
| * tomoyo_read_manager - Read manager policy. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static void tomoyo_read_manager(struct tomoyo_io_buffer *head) |
| { |
| if (head->r.eof) |
| return; |
| list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace. |
| policy_list[TOMOYO_ID_MANAGER]) { |
| struct tomoyo_manager *ptr = |
| list_entry(head->r.acl, typeof(*ptr), head.list); |
| if (ptr->head.is_deleted) |
| continue; |
| if (!tomoyo_flush(head)) |
| return; |
| tomoyo_set_string(head, ptr->manager->name); |
| tomoyo_set_lf(head); |
| } |
| head->r.eof = true; |
| } |
| |
| /** |
| * tomoyo_manager - Check whether the current process is a policy manager. |
| * |
| * Returns true if the current process is permitted to modify policy |
| * via /sys/kernel/security/tomoyo/ interface. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static bool tomoyo_manager(void) |
| { |
| struct tomoyo_manager *ptr; |
| const char *exe; |
| const struct task_struct *task = current; |
| const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; |
| bool found = false; |
| |
| if (!tomoyo_policy_loaded) |
| return true; |
| if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid)) |
| return false; |
| list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace. |
| policy_list[TOMOYO_ID_MANAGER], head.list) { |
| if (!ptr->head.is_deleted && ptr->is_domain |
| && !tomoyo_pathcmp(domainname, ptr->manager)) { |
| found = true; |
| break; |
| } |
| } |
| if (found) |
| return true; |
| exe = tomoyo_get_exe(); |
| if (!exe) |
| return false; |
| list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace. |
| policy_list[TOMOYO_ID_MANAGER], head.list) { |
| if (!ptr->head.is_deleted && !ptr->is_domain |
| && !strcmp(exe, ptr->manager->name)) { |
| found = true; |
| break; |
| } |
| } |
| if (!found) { /* Reduce error messages. */ |
| static pid_t last_pid; |
| const pid_t pid = current->pid; |
| if (last_pid != pid) { |
| printk(KERN_WARNING "%s ( %s ) is not permitted to " |
| "update policies.\n", domainname->name, exe); |
| last_pid = pid; |
| } |
| } |
| kfree(exe); |
| return found; |
| } |
| |
| /** |
| * tomoyo_select_domain - Parse select command. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * @data: String to parse. |
| * |
| * Returns true on success, false otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static bool tomoyo_select_domain(struct tomoyo_io_buffer *head, |
| const char *data) |
| { |
| unsigned int pid; |
| struct tomoyo_domain_info *domain = NULL; |
| bool global_pid = false; |
| if (strncmp(data, "select ", 7)) |
| return false; |
| data += 7; |
| if (sscanf(data, "pid=%u", &pid) == 1 || |
| (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { |
| struct task_struct *p; |
| rcu_read_lock(); |
| read_lock(&tasklist_lock); |
| if (global_pid) |
| p = find_task_by_pid_ns(pid, &init_pid_ns); |
| else |
| p = find_task_by_vpid(pid); |
| if (p) |
| domain = tomoyo_real_domain(p); |
| read_unlock(&tasklist_lock); |
| rcu_read_unlock(); |
| } else if (!strncmp(data, "domain=", 7)) { |
| if (tomoyo_domain_def(data + 7)) |
| domain = tomoyo_find_domain(data + 7); |
| } else |
| return false; |
| head->w.domain = domain; |
| /* Accessing read_buf is safe because head->io_sem is held. */ |
| if (!head->read_buf) |
| return true; /* Do nothing if open(O_WRONLY). */ |
| memset(&head->r, 0, sizeof(head->r)); |
| head->r.print_this_domain_only = true; |
| if (domain) |
| head->r.domain = &domain->list; |
| else |
| head->r.eof = 1; |
| tomoyo_io_printf(head, "# select %s\n", data); |
| if (domain && domain->is_deleted) |
| tomoyo_io_printf(head, "# This is a deleted domain.\n"); |
| return true; |
| } |
| |
| /** |
| * tomoyo_delete_domain - Delete a domain. |
| * |
| * @domainname: The name of domain. |
| * |
| * Returns 0. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static int tomoyo_delete_domain(char *domainname) |
| { |
| struct tomoyo_domain_info *domain; |
| struct tomoyo_path_info name; |
| |
| name.name = domainname; |
| tomoyo_fill_path_info(&name); |
| if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
| return 0; |
| /* Is there an active domain? */ |
| list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
| /* Never delete tomoyo_kernel_domain */ |
| if (domain == &tomoyo_kernel_domain) |
| continue; |
| if (domain->is_deleted || |
| tomoyo_pathcmp(domain->domainname, &name)) |
| continue; |
| domain->is_deleted = true; |
| break; |
| } |
| mutex_unlock(&tomoyo_policy_lock); |
| return 0; |
| } |
| |
| /** |
| * tomoyo_write_domain2 - Write domain policy. |
| * |
| * @ns: Pointer to "struct tomoyo_policy_namespace". |
| * @list: Pointer to "struct list_head". |
| * @data: Policy to be interpreted. |
| * @is_delete: True if it is a delete request. |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns, |
| struct list_head *list, char *data, |
| const bool is_delete) |
| { |
| struct tomoyo_acl_param param = { |
| .ns = ns, |
| .list = list, |
| .data = data, |
| .is_delete = is_delete, |
| }; |
| static const struct { |
| const char *keyword; |
| int (*write) (struct tomoyo_acl_param *); |
| } tomoyo_callback[1] = { |
| { "file ", tomoyo_write_file }, |
| }; |
| u8 i; |
| for (i = 0; i < 1; i++) { |
| if (!tomoyo_str_starts(¶m.data, |
| tomoyo_callback[i].keyword)) |
| continue; |
| return tomoyo_callback[i].write(¶m); |
| } |
| return -EINVAL; |
| } |
| |
| /** |
| * tomoyo_write_domain - Write domain policy. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static int tomoyo_write_domain(struct tomoyo_io_buffer *head) |
| { |
| char *data = head->write_buf; |
| struct tomoyo_policy_namespace *ns; |
| struct tomoyo_domain_info *domain = head->w.domain; |
| const bool is_delete = head->w.is_delete; |
| bool is_select = !is_delete && tomoyo_str_starts(&data, "select "); |
| unsigned int profile; |
| if (*data == '<') { |
| domain = NULL; |
| if (is_delete) |
| tomoyo_delete_domain(data); |
| else if (is_select) |
| domain = tomoyo_find_domain(data); |
| else |
| domain = tomoyo_assign_domain(data, false); |
| head->w.domain = domain; |
| return 0; |
| } |
| if (!domain) |
| return -EINVAL; |
| ns = domain->ns; |
| if (sscanf(data, "use_profile %u", &profile) == 1 |
| && profile < TOMOYO_MAX_PROFILES) { |
| if (!tomoyo_policy_loaded || ns->profile_ptr[profile]) |
| domain->profile = (u8) profile; |
| return 0; |
| } |
| if (sscanf(data, "use_group %u\n", &profile) == 1 |
| && profile < TOMOYO_MAX_ACL_GROUPS) { |
| if (!is_delete) |
| domain->group = (u8) profile; |
| return 0; |
| } |
| if (!strcmp(data, "quota_exceeded")) { |
| domain->quota_warned = !is_delete; |
| return 0; |
| } |
| if (!strcmp(data, "transition_failed")) { |
| domain->transition_failed = !is_delete; |
| return 0; |
| } |
| return tomoyo_write_domain2(ns, &domain->acl_info_list, data, |
| is_delete); |
| } |
| |
| /** |
| * tomoyo_set_group - Print "acl_group " header keyword and category name. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * @category: Category name. |
| * |
| * Returns nothing. |
| */ |
| static void tomoyo_set_group(struct tomoyo_io_buffer *head, |
| const char *category) |
| { |
| if (head->type == TOMOYO_EXCEPTIONPOLICY) { |
| tomoyo_print_namespace(head); |
| tomoyo_io_printf(head, "acl_group %u ", |
| head->r.acl_group_index); |
| } |
| tomoyo_set_string(head, category); |
| } |
| |
| /** |
| * tomoyo_print_entry - Print an ACL entry. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * @acl: Pointer to an ACL entry. |
| * |
| * Returns true on success, false otherwise. |
| */ |
| static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, |
| struct tomoyo_acl_info *acl) |
| { |
| const u8 acl_type = acl->type; |
| bool first = true; |
| u8 bit; |
| |
| if (acl->is_deleted) |
| return true; |
| if (!tomoyo_flush(head)) |
| return false; |
| else if (acl_type == TOMOYO_TYPE_PATH_ACL) { |
| struct tomoyo_path_acl *ptr = |
| container_of(acl, typeof(*ptr), head); |
| const u16 perm = ptr->perm; |
| for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { |
| if (!(perm & (1 << bit))) |
| continue; |
| if (head->r.print_transition_related_only && |
| bit != TOMOYO_TYPE_EXECUTE) |
| continue; |
| if (first) { |
| tomoyo_set_group(head, "file "); |
| first = false; |
| } else { |
| tomoyo_set_slash(head); |
| } |
| tomoyo_set_string(head, tomoyo_path_keyword[bit]); |
| } |
| if (first) |
| return true; |
| tomoyo_print_name_union(head, &ptr->name); |
| } else if (head->r.print_transition_related_only) { |
| return true; |
| } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) { |
| struct tomoyo_path2_acl *ptr = |
| container_of(acl, typeof(*ptr), head); |
| const u8 perm = ptr->perm; |
| for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { |
| if (!(perm & (1 << bit))) |
| continue; |
| if (first) { |
| tomoyo_set_group(head, "file "); |
| first = false; |
| } else { |
| tomoyo_set_slash(head); |
| } |
| tomoyo_set_string(head, tomoyo_mac_keywords |
| [tomoyo_pp2mac[bit]]); |
| } |
| if (first) |
| return true; |
| tomoyo_print_name_union(head, &ptr->name1); |
| tomoyo_print_name_union(head, &ptr->name2); |
| } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { |
| struct tomoyo_path_number_acl *ptr = |
| container_of(acl, typeof(*ptr), head); |
| const u8 perm = ptr->perm; |
| for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) { |
| if (!(perm & (1 << bit))) |
| continue; |
| if (first) { |
| tomoyo_set_group(head, "file "); |
| first = false; |
| } else { |
| tomoyo_set_slash(head); |
| } |
| tomoyo_set_string(head, tomoyo_mac_keywords |
| [tomoyo_pn2mac[bit]]); |
| } |
| if (first) |
| return true; |
| tomoyo_print_name_union(head, &ptr->name); |
| tomoyo_print_number_union(head, &ptr->number); |
| } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) { |
| struct tomoyo_mkdev_acl *ptr = |
| container_of(acl, typeof(*ptr), head); |
| const u8 perm = ptr->perm; |
| for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) { |
| if (!(perm & (1 << bit))) |
| continue; |
| if (first) { |
| tomoyo_set_group(head, "file "); |
| first = false; |
| } else { |
| tomoyo_set_slash(head); |
| } |
| tomoyo_set_string(head, tomoyo_mac_keywords |
| [tomoyo_pnnn2mac[bit]]); |
| } |
| if (first) |
| return true; |
| tomoyo_print_name_union(head, &ptr->name); |
| tomoyo_print_number_union(head, &ptr->mode); |
| tomoyo_print_number_union(head, &ptr->major); |
| tomoyo_print_number_union(head, &ptr->minor); |
| } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { |
| struct tomoyo_mount_acl *ptr = |
| container_of(acl, typeof(*ptr), head); |
| tomoyo_set_group(head, "file mount"); |
| tomoyo_print_name_union(head, &ptr->dev_name); |
| tomoyo_print_name_union(head, &ptr->dir_name); |
| tomoyo_print_name_union(head, &ptr->fs_type); |
| tomoyo_print_number_union(head, &ptr->flags); |
| } |
| tomoyo_set_lf(head); |
| return true; |
| } |
| |
| /** |
| * tomoyo_read_domain2 - Read domain policy. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * @list: Pointer to "struct list_head". |
| * |
| * Caller holds tomoyo_read_lock(). |
| * |
| * Returns true on success, false otherwise. |
| */ |
| static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head, |
| struct list_head *list) |
| { |
| list_for_each_cookie(head->r.acl, list) { |
| struct tomoyo_acl_info *ptr = |
| list_entry(head->r.acl, typeof(*ptr), list); |
| if (!tomoyo_print_entry(head, ptr)) |
| return false; |
| } |
| head->r.acl = NULL; |
| return true; |
| } |
| |
| /** |
| * tomoyo_read_domain - Read domain policy. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static void tomoyo_read_domain(struct tomoyo_io_buffer *head) |
| { |
| if (head->r.eof) |
| return; |
| list_for_each_cookie(head->r.domain, &tomoyo_domain_list) { |
| struct tomoyo_domain_info *domain = |
| list_entry(head->r.domain, typeof(*domain), list); |
| switch (head->r.step) { |
| case 0: |
| if (domain->is_deleted && |
| !head->r.print_this_domain_only) |
| continue; |
| /* Print domainname and flags. */ |
| tomoyo_set_string(head, domain->domainname->name); |
| tomoyo_set_lf(head); |
| tomoyo_io_printf(head, "use_profile %u\n", |
| domain->profile); |
| tomoyo_io_printf(head, "use_group %u\n", |
| domain->group); |
| if (domain->quota_warned) |
| tomoyo_set_string(head, "quota_exceeded\n"); |
| if (domain->transition_failed) |
| tomoyo_set_string(head, "transition_failed\n"); |
| head->r.step++; |
| tomoyo_set_lf(head); |
| /* fall through */ |
| case 1: |
| if (!tomoyo_read_domain2(head, &domain->acl_info_list)) |
| return; |
| head->r.step++; |
| if (!tomoyo_set_lf(head)) |
| return; |
| /* fall through */ |
| case 2: |
| head->r.step = 0; |
| if (head->r.print_this_domain_only) |
| goto done; |
| } |
| } |
| done: |
| head->r.eof = true; |
| } |
| |
| /** |
| * tomoyo_write_domain_profile - Assign profile for specified domain. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns 0 on success, -EINVAL otherwise. |
| * |
| * This is equivalent to doing |
| * |
| * ( echo "select " $domainname; echo "use_profile " $profile ) | |
| * /usr/sbin/tomoyo-loadpolicy -d |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) |
| { |
| char *data = head->write_buf; |
| char *cp = strchr(data, ' '); |
| struct tomoyo_domain_info *domain; |
| unsigned long profile; |
| |
| if (!cp) |
| return -EINVAL; |
| *cp = '\0'; |
| domain = tomoyo_find_domain(cp + 1); |
| if (strict_strtoul(data, 10, &profile)) |
| return -EINVAL; |
| if (domain && (!tomoyo_policy_loaded || |
| head->w.ns->profile_ptr[(u8) profile])) |
| domain->profile = (u8) profile; |
| return 0; |
| } |
| |
| /** |
| * tomoyo_read_domain_profile - Read only domainname and profile. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns list of profile number and domainname pairs. |
| * |
| * This is equivalent to doing |
| * |
| * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | |
| * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) |
| * domainname = $0; } else if ( $1 == "use_profile" ) { |
| * print $2 " " domainname; domainname = ""; } } ; ' |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) |
| { |
| if (head->r.eof) |
| return; |
| list_for_each_cookie(head->r.domain, &tomoyo_domain_list) { |
| struct tomoyo_domain_info *domain = |
| list_entry(head->r.domain, typeof(*domain), list); |
| if (domain->is_deleted) |
| continue; |
| if (!tomoyo_flush(head)) |
| return; |
| tomoyo_io_printf(head, "%u ", domain->profile); |
| tomoyo_set_string(head, domain->domainname->name); |
| tomoyo_set_lf(head); |
| } |
| head->r.eof = true; |
| } |
| |
| /** |
| * tomoyo_write_pid: Specify PID to obtain domainname. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns 0. |
| */ |
| static int tomoyo_write_pid(struct tomoyo_io_buffer *head) |
| { |
| head->r.eof = false; |
| return 0; |
| } |
| |
| /** |
| * tomoyo_read_pid - Get domainname of the specified PID. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns the domainname which the specified PID is in on success, |
| * empty string otherwise. |
| * The PID is specified by tomoyo_write_pid() so that the user can obtain |
| * using read()/write() interface rather than sysctl() interface. |
| */ |
| static void tomoyo_read_pid(struct tomoyo_io_buffer *head) |
| { |
| char *buf = head->write_buf; |
| bool global_pid = false; |
| unsigned int pid; |
| struct task_struct *p; |
| struct tomoyo_domain_info *domain = NULL; |
| |
| /* Accessing write_buf is safe because head->io_sem is held. */ |
| if (!buf) { |
| head->r.eof = true; |
| return; /* Do nothing if open(O_RDONLY). */ |
| } |
| if (head->r.w_pos || head->r.eof) |
| return; |
| head->r.eof = true; |
| if (tomoyo_str_starts(&buf, "global-pid ")) |
| global_pid = true; |
| pid = (unsigned int) simple_strtoul(buf, NULL, 10); |
| rcu_read_lock(); |
| read_lock(&tasklist_lock); |
| if (global_pid) |
| p = find_task_by_pid_ns(pid, &init_pid_ns); |
| else |
| p = find_task_by_vpid(pid); |
| if (p) |
| domain = tomoyo_real_domain(p); |
| read_unlock(&tasklist_lock); |
| rcu_read_unlock(); |
| if (!domain) |
| return; |
| tomoyo_io_printf(head, "%u %u ", pid, domain->profile); |
| tomoyo_set_string(head, domain->domainname->name); |
| } |
| |
| static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = { |
| [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ", |
| [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ", |
| [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ", |
| [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ", |
| [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ", |
| [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ", |
| }; |
| |
| static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = { |
| [TOMOYO_PATH_GROUP] = "path_group ", |
| [TOMOYO_NUMBER_GROUP] = "number_group ", |
| }; |
| |
| /** |
| * tomoyo_write_exception - Write exception policy. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static int tomoyo_write_exception(struct tomoyo_io_buffer *head) |
| { |
| const bool is_delete = head->w.is_delete; |
| struct tomoyo_acl_param param = { |
| .ns = head->w.ns, |
| .is_delete = is_delete, |
| .data = head->write_buf, |
| }; |
| u8 i; |
| if (tomoyo_str_starts(¶m.data, "aggregator ")) |
| return tomoyo_write_aggregator(¶m); |
| for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) |
| if (tomoyo_str_starts(¶m.data, tomoyo_transition_type[i])) |
| return tomoyo_write_transition_control(¶m, i); |
| for (i = 0; i < TOMOYO_MAX_GROUP; i++) |
| if (tomoyo_str_starts(¶m.data, tomoyo_group_name[i])) |
| return tomoyo_write_group(¶m, i); |
| if (tomoyo_str_starts(¶m.data, "acl_group ")) { |
| unsigned int group; |
| char *data; |
| group = simple_strtoul(param.data, &data, 10); |
| if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ') |
| return tomoyo_write_domain2 |
| (head->w.ns, &head->w.ns->acl_group[group], |
| data, is_delete); |
| } |
| return -EINVAL; |
| } |
| |
| /** |
| * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * @idx: Index number. |
| * |
| * Returns true on success, false otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx) |
| { |
| struct tomoyo_policy_namespace *ns = |
| container_of(head->r.ns, typeof(*ns), namespace_list); |
| struct list_head *list = &ns->group_list[idx]; |
| list_for_each_cookie(head->r.group, list) { |
| struct tomoyo_group *group = |
| list_entry(head->r.group, typeof(*group), head.list); |
| list_for_each_cookie(head->r.acl, &group->member_list) { |
| struct tomoyo_acl_head *ptr = |
| list_entry(head->r.acl, typeof(*ptr), list); |
| if (ptr->is_deleted) |
| continue; |
| if (!tomoyo_flush(head)) |
| return false; |
| tomoyo_print_namespace(head); |
| tomoyo_set_string(head, tomoyo_group_name[idx]); |
| tomoyo_set_string(head, group->group_name->name); |
| if (idx == TOMOYO_PATH_GROUP) { |
| tomoyo_set_space(head); |
| tomoyo_set_string(head, container_of |
| (ptr, struct tomoyo_path_group, |
| head)->member_name->name); |
| } else if (idx == TOMOYO_NUMBER_GROUP) { |
| tomoyo_print_number_union(head, &container_of |
| (ptr, |
| struct tomoyo_number_group, |
| head)->number); |
| } |
| tomoyo_set_lf(head); |
| } |
| head->r.acl = NULL; |
| } |
| head->r.group = NULL; |
| return true; |
| } |
| |
| /** |
| * tomoyo_read_policy - Read "struct tomoyo_..._entry" list. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * @idx: Index number. |
| * |
| * Returns true on success, false otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx) |
| { |
| struct tomoyo_policy_namespace *ns = |
| container_of(head->r.ns, typeof(*ns), namespace_list); |
| struct list_head *list = &ns->policy_list[idx]; |
| list_for_each_cookie(head->r.acl, list) { |
| struct tomoyo_acl_head *acl = |
| container_of(head->r.acl, typeof(*acl), list); |
| if (acl->is_deleted) |
| continue; |
| if (!tomoyo_flush(head)) |
| return false; |
| switch (idx) { |
| case TOMOYO_ID_TRANSITION_CONTROL: |
| { |
| struct tomoyo_transition_control *ptr = |
| container_of(acl, typeof(*ptr), head); |
| tomoyo_print_namespace(head); |
| tomoyo_set_string(head, tomoyo_transition_type |
| [ptr->type]); |
| tomoyo_set_string(head, ptr->program ? |
| ptr->program->name : "any"); |
| tomoyo_set_string(head, " from "); |
| tomoyo_set_string(head, ptr->domainname ? |
| ptr->domainname->name : |
| "any"); |
| } |
| break; |
| case TOMOYO_ID_AGGREGATOR: |
| { |
| struct tomoyo_aggregator *ptr = |
| container_of(acl, typeof(*ptr), head); |
| tomoyo_print_namespace(head); |
| tomoyo_set_string(head, "aggregator "); |
| tomoyo_set_string(head, |
| ptr->original_name->name); |
| tomoyo_set_space(head); |
| tomoyo_set_string(head, |
| ptr->aggregated_name->name); |
| } |
| break; |
| default: |
| continue; |
| } |
| tomoyo_set_lf(head); |
| } |
| head->r.acl = NULL; |
| return true; |
| } |
| |
| /** |
| * tomoyo_read_exception - Read exception policy. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static void tomoyo_read_exception(struct tomoyo_io_buffer *head) |
| { |
| struct tomoyo_policy_namespace *ns = |
| container_of(head->r.ns, typeof(*ns), namespace_list); |
| if (head->r.eof) |
| return; |
| while (head->r.step < TOMOYO_MAX_POLICY && |
| tomoyo_read_policy(head, head->r.step)) |
| head->r.step++; |
| if (head->r.step < TOMOYO_MAX_POLICY) |
| return; |
| while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP && |
| tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY)) |
| head->r.step++; |
| if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP) |
| return; |
| while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP |
| + TOMOYO_MAX_ACL_GROUPS) { |
| head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY |
| - TOMOYO_MAX_GROUP; |
| if (!tomoyo_read_domain2(head, &ns->acl_group |
| [head->r.acl_group_index])) |
| return; |
| head->r.step++; |
| } |
| head->r.eof = true; |
| } |
| |
| /* Wait queue for kernel -> userspace notification. */ |
| static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); |
| /* Wait queue for userspace -> kernel notification. */ |
| static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait); |
| |
| /* Structure for query. */ |
| struct tomoyo_query { |
| struct list_head list; |
| char *query; |
| size_t query_len; |
| unsigned int serial; |
| u8 timer; |
| u8 answer; |
| u8 retry; |
| }; |
| |
| /* The list for "struct tomoyo_query". */ |
| static LIST_HEAD(tomoyo_query_list); |
| |
| /* Lock for manipulating tomoyo_query_list. */ |
| static DEFINE_SPINLOCK(tomoyo_query_list_lock); |
| |
| /* |
| * Number of "struct file" referring /sys/kernel/security/tomoyo/query |
| * interface. |
| */ |
| static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); |
| |
| /** |
| * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode. |
| * |
| * @domain: Pointer to "struct tomoyo_domain_info". |
| * @header: Lines containing ACL. |
| * |
| * Returns nothing. |
| */ |
| static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header) |
| { |
| char *buffer; |
| char *cp = strchr(header, '\n'); |
| int len; |
| if (!cp) |
| return; |
| cp = strchr(cp + 1, '\n'); |
| if (!cp) |
| return; |
| *cp++ = '\0'; |
| len = strlen(cp) + 1; |
| buffer = kmalloc(len, GFP_NOFS); |
| if (!buffer) |
| return; |
| snprintf(buffer, len - 1, "%s", cp); |
| tomoyo_normalize_line(buffer); |
| tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer, |
| false); |
| kfree(buffer); |
| } |
| |
| /** |
| * tomoyo_supervisor - Ask for the supervisor's decision. |
| * |
| * @r: Pointer to "struct tomoyo_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, TOMOYO_RETRY_REQUEST if the |
| * supervisor decided to retry the access request which violated the policy in |
| * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. |
| */ |
| int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) |
| { |
| va_list args; |
| int error; |
| int len; |
| static unsigned int tomoyo_serial; |
| struct tomoyo_query entry = { }; |
| bool quota_exceeded = false; |
| va_start(args, fmt); |
| len = vsnprintf((char *) &len, 1, fmt, args) + 1; |
| va_end(args); |
| /* Write /sys/kernel/security/tomoyo/audit. */ |
| va_start(args, fmt); |
| tomoyo_write_log2(r, len, fmt, args); |
| va_end(args); |
| /* Nothing more to do if granted. */ |
| if (r->granted) |
| return 0; |
| switch (r->mode) { |
| case TOMOYO_CONFIG_ENFORCING: |
| error = -EPERM; |
| if (atomic_read(&tomoyo_query_observers)) |
| break; |
| goto out; |
| case TOMOYO_CONFIG_LEARNING: |
| error = 0; |
| /* Check max_learning_entry parameter. */ |
| if (tomoyo_domain_quota_is_ok(r)) |
| break; |
| /* fall through */ |
| default: |
| return 0; |
| } |
| /* Get message. */ |
| va_start(args, fmt); |
| entry.query = tomoyo_init_log(r, len, fmt, args); |
| va_end(args); |
| if (!entry.query) |
| goto out; |
| entry.query_len = strlen(entry.query) + 1; |
| if (!error) { |
| tomoyo_add_entry(r->domain, entry.query); |
| goto out; |
| } |
| len = tomoyo_round2(entry.query_len); |
| spin_lock(&tomoyo_query_list_lock); |
| if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] && |
| tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len |
| >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) { |
| quota_exceeded = true; |
| } else { |
| entry.serial = tomoyo_serial++; |
| entry.retry = r->retry; |
| tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len; |
| list_add_tail(&entry.list, &tomoyo_query_list); |
| } |
| spin_unlock(&tomoyo_query_list_lock); |
| if (quota_exceeded) |
| goto out; |
| /* Give 10 seconds for supervisor's opinion. */ |
| while (entry.timer < 10) { |
| wake_up_all(&tomoyo_query_wait); |
| if (wait_event_interruptible_timeout |
| (tomoyo_answer_wait, entry.answer || |
| !atomic_read(&tomoyo_query_observers), HZ)) |
| break; |
| else |
| entry.timer++; |
| } |
| spin_lock(&tomoyo_query_list_lock); |
| list_del(&entry.list); |
| tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len; |
| spin_unlock(&tomoyo_query_list_lock); |
| switch (entry.answer) { |
| case 3: /* Asked to retry by administrator. */ |
| error = TOMOYO_RETRY_REQUEST; |
| r->retry++; |
| break; |
| case 1: |
| /* Granted by administrator. */ |
| error = 0; |
| break; |
| default: |
| /* Timed out or rejected by administrator. */ |
| break; |
| } |
| out: |
| kfree(entry.query); |
| return error; |
| } |
| |
| /** |
| * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/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 tomoyo_poll_query(struct file *file, poll_table *wait) |
| { |
| struct list_head *tmp; |
| bool found = false; |
| u8 i; |
| for (i = 0; i < 2; i++) { |
| spin_lock(&tomoyo_query_list_lock); |
| list_for_each(tmp, &tomoyo_query_list) { |
| struct tomoyo_query *ptr = |
| list_entry(tmp, typeof(*ptr), list); |
| if (ptr->answer) |
| continue; |
| found = true; |
| break; |
| } |
| spin_unlock(&tomoyo_query_list_lock); |
| if (found) |
| return POLLIN | POLLRDNORM; |
| if (i) |
| break; |
| poll_wait(file, &tomoyo_query_wait, wait); |
| } |
| return 0; |
| } |
| |
| /** |
| * tomoyo_read_query - Read access requests which violated policy in enforcing mode. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| */ |
| static void tomoyo_read_query(struct tomoyo_io_buffer *head) |
| { |
| struct list_head *tmp; |
| int pos = 0; |
| int len = 0; |
| char *buf; |
| if (head->r.w_pos) |
| return; |
| if (head->read_buf) { |
| kfree(head->read_buf); |
| head->read_buf = NULL; |
| } |
| spin_lock(&tomoyo_query_list_lock); |
| list_for_each(tmp, &tomoyo_query_list) { |
| struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); |
| if (ptr->answer) |
| continue; |
| if (pos++ != head->r.query_index) |
| continue; |
| len = ptr->query_len; |
| break; |
| } |
| spin_unlock(&tomoyo_query_list_lock); |
| if (!len) { |
| head->r.query_index = 0; |
| return; |
| } |
| buf = kzalloc(len + 32, GFP_NOFS); |
| if (!buf) |
| return; |
| pos = 0; |
| spin_lock(&tomoyo_query_list_lock); |
| list_for_each(tmp, &tomoyo_query_list) { |
| struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); |
| if (ptr->answer) |
| continue; |
| if (pos++ != head->r.query_index) |
| continue; |
| /* |
| * Some query can be skipped because tomoyo_query_list |
| * can change, but I don't care. |
| */ |
| if (len == ptr->query_len) |
| snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial, |
| ptr->retry, ptr->query); |
| break; |
| } |
| spin_unlock(&tomoyo_query_list_lock); |
| if (buf[0]) { |
| head->read_buf = buf; |
| head->r.w[head->r.w_pos++] = buf; |
| head->r.query_index++; |
| } else { |
| kfree(buf); |
| } |
| } |
| |
| /** |
| * tomoyo_write_answer - Write the supervisor's decision. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns 0 on success, -EINVAL otherwise. |
| */ |
| static int tomoyo_write_answer(struct tomoyo_io_buffer *head) |
| { |
| char *data = head->write_buf; |
| struct list_head *tmp; |
| unsigned int serial; |
| unsigned int answer; |
| spin_lock(&tomoyo_query_list_lock); |
| list_for_each(tmp, &tomoyo_query_list) { |
| struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); |
| ptr->timer = 0; |
| } |
| spin_unlock(&tomoyo_query_list_lock); |
| if (sscanf(data, "A%u=%u", &serial, &answer) != 2) |
| return -EINVAL; |
| spin_lock(&tomoyo_query_list_lock); |
| list_for_each(tmp, &tomoyo_query_list) { |
| struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); |
| if (ptr->serial != serial) |
| continue; |
| if (!ptr->answer) |
| ptr->answer = answer; |
| break; |
| } |
| spin_unlock(&tomoyo_query_list_lock); |
| return 0; |
| } |
| |
| /** |
| * tomoyo_read_version: Get version. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns version information. |
| */ |
| static void tomoyo_read_version(struct tomoyo_io_buffer *head) |
| { |
| if (!head->r.eof) { |
| tomoyo_io_printf(head, "2.4.0"); |
| head->r.eof = true; |
| } |
| } |
| |
| /** |
| * tomoyo_read_self_domain - Get the current process's domainname. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns the current process's domainname. |
| */ |
| static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head) |
| { |
| if (!head->r.eof) { |
| /* |
| * tomoyo_domain()->domainname != NULL |
| * because every process belongs to a domain and |
| * the domain's name cannot be NULL. |
| */ |
| tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); |
| head->r.eof = true; |
| } |
| } |
| |
| /** |
| * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. |
| * |
| * @type: Type of interface. |
| * @file: Pointer to "struct file". |
| * |
| * Associates policy handler and returns 0 on success, -ENOMEM otherwise. |
| * |
| * Caller acquires tomoyo_read_lock(). |
| */ |
| int tomoyo_open_control(const u8 type, struct file *file) |
| { |
| struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); |
| |
| if (!head) |
| return -ENOMEM; |
| mutex_init(&head->io_sem); |
| head->type = type; |
| switch (type) { |
| case TOMOYO_DOMAINPOLICY: |
| /* /sys/kernel/security/tomoyo/domain_policy */ |
| head->write = tomoyo_write_domain; |
| head->read = tomoyo_read_domain; |
| break; |
| case TOMOYO_EXCEPTIONPOLICY: |
| /* /sys/kernel/security/tomoyo/exception_policy */ |
| head->write = tomoyo_write_exception; |
| head->read = tomoyo_read_exception; |
| break; |
| case TOMOYO_AUDIT: |
| /* /sys/kernel/security/tomoyo/audit */ |
| head->poll = tomoyo_poll_log; |
| head->read = tomoyo_read_log; |
| break; |
| case TOMOYO_SELFDOMAIN: |
| /* /sys/kernel/security/tomoyo/self_domain */ |
| head->read = tomoyo_read_self_domain; |
| break; |
| case TOMOYO_DOMAIN_STATUS: |
| /* /sys/kernel/security/tomoyo/.domain_status */ |
| head->write = tomoyo_write_domain_profile; |
| head->read = tomoyo_read_domain_profile; |
| break; |
| case TOMOYO_PROCESS_STATUS: |
| /* /sys/kernel/security/tomoyo/.process_status */ |
| head->write = tomoyo_write_pid; |
| head->read = tomoyo_read_pid; |
| break; |
| case TOMOYO_VERSION: |
| /* /sys/kernel/security/tomoyo/version */ |
| head->read = tomoyo_read_version; |
| head->readbuf_size = 128; |
| break; |
| case TOMOYO_MEMINFO: |
| /* /sys/kernel/security/tomoyo/meminfo */ |
| head->write = tomoyo_write_memory_quota; |
| head->read = tomoyo_read_memory_counter; |
| head->readbuf_size = 512; |
| break; |
| case TOMOYO_PROFILE: |
| /* /sys/kernel/security/tomoyo/profile */ |
| head->write = tomoyo_write_profile; |
| head->read = tomoyo_read_profile; |
| break; |
| case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ |
| head->poll = tomoyo_poll_query; |
| head->write = tomoyo_write_answer; |
| head->read = tomoyo_read_query; |
| break; |
| case TOMOYO_MANAGER: |
| /* /sys/kernel/security/tomoyo/manager */ |
| head->write = tomoyo_write_manager; |
| head->read = tomoyo_read_manager; |
| 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 (!head->poll) { |
| /* Don't allocate read_buf for poll() access. */ |
| if (!head->readbuf_size) |
| head->readbuf_size = 4096 * 2; |
| head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); |
| 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_NOFS); |
| if (!head->write_buf) { |
| kfree(head->read_buf); |
| kfree(head); |
| return -ENOMEM; |
| } |
| } |
| if (type != TOMOYO_QUERY && type != TOMOYO_AUDIT) |
| head->reader_idx = tomoyo_read_lock(); |
| file->private_data = head; |
| /* |
| * If the file is /sys/kernel/security/tomoyo/query , increment the |
| * observer counter. |
| * The obserber counter is used by tomoyo_supervisor() to see if |
| * there is some process monitoring /sys/kernel/security/tomoyo/query. |
| */ |
| if (type == TOMOYO_QUERY) |
| atomic_inc(&tomoyo_query_observers); |
| return 0; |
| } |
| |
| /** |
| * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. |
| * |
| * @file: Pointer to "struct file". |
| * @wait: Pointer to "poll_table". |
| * |
| * Waits for read readiness. |
| * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and |
| * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd. |
| */ |
| int tomoyo_poll_control(struct file *file, poll_table *wait) |
| { |
| struct tomoyo_io_buffer *head = file->private_data; |
| if (!head->poll) |
| return -ENOSYS; |
| return head->poll(file, wait); |
| } |
| |
| /** |
| * tomoyo_set_namespace_cursor - Set namespace to read. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns nothing. |
| */ |
| static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head) |
| { |
| struct list_head *ns; |
| if (head->type != TOMOYO_EXCEPTIONPOLICY && |
| head->type != TOMOYO_PROFILE) |
| return; |
| /* |
| * If this is the first read, or reading previous namespace finished |
| * and has more namespaces to read, update the namespace cursor. |
| */ |
| ns = head->r.ns; |
| if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) { |
| /* Clearing is OK because tomoyo_flush() returned true. */ |
| memset(&head->r, 0, sizeof(head->r)); |
| head->r.ns = ns ? ns->next : tomoyo_namespace_list.next; |
| } |
| } |
| |
| /** |
| * tomoyo_has_more_namespace - Check for unread namespaces. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns true if we have more entries to print, false otherwise. |
| */ |
| static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head) |
| { |
| return (head->type == TOMOYO_EXCEPTIONPOLICY || |
| head->type == TOMOYO_PROFILE) && head->r.eof && |
| head->r.ns->next != &tomoyo_namespace_list; |
| } |
| |
| /** |
| * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * @buffer: Poiner to buffer to write to. |
| * @buffer_len: Size of @buffer. |
| * |
| * Returns bytes read on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| int tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer, |
| const int buffer_len) |
| { |
| int len; |
| |
| if (!head->read) |
| return -ENOSYS; |
| if (mutex_lock_interruptible(&head->io_sem)) |
| return -EINTR; |
| head->read_user_buf = buffer; |
| head->read_user_buf_avail = buffer_len; |
| if (tomoyo_flush(head)) |
| /* Call the policy handler. */ |
| do { |
| tomoyo_set_namespace_cursor(head); |
| head->read(head); |
| } while (tomoyo_flush(head) && |
| tomoyo_has_more_namespace(head)); |
| len = head->read_user_buf - buffer; |
| mutex_unlock(&head->io_sem); |
| return len; |
| } |
| |
| /** |
| * tomoyo_parse_policy - Parse a policy line. |
| * |
| * @head: Poiter to "struct tomoyo_io_buffer". |
| * @line: Line to parse. |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line) |
| { |
| /* Delete request? */ |
| head->w.is_delete = !strncmp(line, "delete ", 7); |
| if (head->w.is_delete) |
| memmove(line, line + 7, strlen(line + 7) + 1); |
| /* Selecting namespace to update. */ |
| if (head->type == TOMOYO_EXCEPTIONPOLICY || |
| head->type == TOMOYO_PROFILE) { |
| if (*line == '<') { |
| char *cp = strchr(line, ' '); |
| if (cp) { |
| *cp++ = '\0'; |
| head->w.ns = tomoyo_assign_namespace(line); |
| memmove(line, cp, strlen(cp) + 1); |
| } else |
| head->w.ns = NULL; |
| } else |
| head->w.ns = &tomoyo_kernel_namespace; |
| /* Don't allow updating if namespace is invalid. */ |
| if (!head->w.ns) |
| return -ENOENT; |
| } |
| /* Do the update. */ |
| return head->write(head); |
| } |
| |
| /** |
| * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * @buffer: Pointer to buffer to read from. |
| * @buffer_len: Size of @buffer. |
| * |
| * Returns @buffer_len on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| int tomoyo_write_control(struct tomoyo_io_buffer *head, |
| const char __user *buffer, const int buffer_len) |
| { |
| int error = buffer_len; |
| size_t avail_len = buffer_len; |
| char *cp0 = head->write_buf; |
| if (!head->write) |
| return -ENOSYS; |
| if (!access_ok(VERIFY_READ, buffer, buffer_len)) |
| return -EFAULT; |
| 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->w.avail >= head->writebuf_size - 1) { |
| const int len = head->writebuf_size * 2; |
| char *cp = kzalloc(len, GFP_NOFS); |
| if (!cp) { |
| error = -ENOMEM; |
| break; |
| } |
| memmove(cp, cp0, head->w.avail); |
| kfree(cp0); |
| head->write_buf = cp; |
| cp0 = cp; |
| head->writebuf_size = len; |
| } |
| if (get_user(c, buffer)) { |
| error = -EFAULT; |
| break; |
| } |
| buffer++; |
| avail_len--; |
| cp0[head->w.avail++] = c; |
| if (c != '\n') |
| continue; |
| cp0[head->w.avail - 1] = '\0'; |
| head->w.avail = 0; |
| tomoyo_normalize_line(cp0); |
| if (!strcmp(cp0, "reset")) { |
| head->w.ns = &tomoyo_kernel_namespace; |
| head->w.domain = NULL; |
| memset(&head->r, 0, sizeof(head->r)); |
| continue; |
| } |
| /* Don't allow updating policies by non manager programs. */ |
| switch (head->type) { |
| case TOMOYO_PROCESS_STATUS: |
| /* This does not write anything. */ |
| break; |
| case TOMOYO_DOMAINPOLICY: |
| if (tomoyo_select_domain(head, cp0)) |
| continue; |
| /* fall through */ |
| case TOMOYO_EXCEPTIONPOLICY: |
| if (!strcmp(cp0, "select transition_only")) { |
| head->r.print_transition_related_only = true; |
| continue; |
| } |
| /* fall through */ |
| default: |
| if (!tomoyo_manager()) { |
| error = -EPERM; |
| goto out; |
| } |
| } |
| switch (tomoyo_parse_policy(head, cp0)) { |
| case -EPERM: |
| error = -EPERM; |
| goto out; |
| } |
| } |
| out: |
| mutex_unlock(&head->io_sem); |
| return error; |
| } |
| |
| /** |
| * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Releases memory and returns 0. |
| * |
| * Caller looses tomoyo_read_lock(). |
| */ |
| int tomoyo_close_control(struct tomoyo_io_buffer *head) |
| { |
| const bool is_write = !!head->write_buf; |
| |
| /* |
| * If the file is /sys/kernel/security/tomoyo/query , decrement the |
| * observer counter. |
| */ |
| if (head->type == TOMOYO_QUERY) |
| atomic_dec(&tomoyo_query_observers); |
| else if (head->type != TOMOYO_AUDIT) |
| tomoyo_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); |
| if (is_write) |
| tomoyo_run_gc(); |
| return 0; |
| } |
| |
| /** |
| * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. |
| */ |
| void tomoyo_check_profile(void) |
| { |
| struct tomoyo_domain_info *domain; |
| const int idx = tomoyo_read_lock(); |
| tomoyo_policy_loaded = true; |
| printk(KERN_INFO "TOMOYO: 2.4.0\n"); |
| list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
| const u8 profile = domain->profile; |
| const struct tomoyo_policy_namespace *ns = domain->ns; |
| if (ns->profile_version != 20100903) |
| printk(KERN_ERR |
| "Profile version %u is not supported.\n", |
| ns->profile_version); |
| else if (!ns->profile_ptr[profile]) |
| printk(KERN_ERR |
| "Profile %u (used by '%s') is not defined.\n", |
| profile, domain->domainname->name); |
| else |
| continue; |
| printk(KERN_ERR |
| "Userland tools for TOMOYO 2.4 must be installed and " |
| "policy must be initialized.\n"); |
| printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.4/ " |
| "for more information.\n"); |
| panic("STOP!"); |
| } |
| tomoyo_read_unlock(idx); |
| printk(KERN_INFO "Mandatory Access Control activated.\n"); |
| } |