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kumaneko |
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/* |
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* fs/tomoyo_capability.c |
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* |
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* Implementation of the Domain-Based Mandatory Access Control. |
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* |
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* Copyright (C) 2005-2007 NTT DATA CORPORATION |
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* |
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* Version: 1.3.2 2007/02/14 |
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* |
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* This file is applicable to both 2.4.30 and 2.6.11 and later. |
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* See README.ccs for ChangeLog. |
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* |
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*/ |
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/***** TOMOYO Linux start. *****/ |
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#include <linux/ccs_common.h> |
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#include <linux/tomoyo.h> |
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#include <linux/realpath.h> |
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/************************* VARIABLES *************************/ |
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extern struct semaphore domain_acl_lock; |
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extern int sbin_init_started; |
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static struct { |
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const char *keyword; |
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unsigned int current_value; |
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const char *capability_name; |
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} capability_control_array[TOMOYO_MAX_CAPABILITY_INDEX] = { /* domain_policy.txt */ |
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[TOMOYO_INET_STREAM_SOCKET_CREATE] = { "inet_tcp_create", 0, "socket(PF_INET, SOCK_STREAM)" }, |
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[TOMOYO_INET_STREAM_SOCKET_LISTEN] = { "inet_tcp_listen", 0, "listen(PF_INET, SOCK_STREAM)" }, |
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[TOMOYO_INET_STREAM_SOCKET_CONNECT] = { "inet_tcp_connect", 0, "connect(PF_INET, SOCK_STREAM)" }, |
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[TOMOYO_USE_INET_DGRAM_SOCKET] = { "use_inet_udp", 0, "socket(PF_INET, SOCK_DGRAM)" }, |
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[TOMOYO_USE_INET_RAW_SOCKET] = { "use_inet_ip", 0, "socket(PF_INET, SOCK_RAW)" }, |
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[TOMOYO_USE_ROUTE_SOCKET] = { "use_route", 0, "socket(PF_ROUTE)" }, |
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[TOMOYO_USE_PACKET_SOCKET] = { "use_packet", 0, "socket(PF_PACKET)" }, |
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[TOMOYO_SYS_MOUNT] = { "SYS_MOUNT", 0, "sys_mount()" }, |
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[TOMOYO_SYS_UMOUNT] = { "SYS_UMOUNT", 0, "sys_umount()" }, |
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[TOMOYO_SYS_REBOOT] = { "SYS_REBOOT", 0, "sys_reboot()" }, |
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[TOMOYO_SYS_CHROOT] = { "SYS_CHROOT", 0, "sys_chroot()" }, |
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[TOMOYO_SYS_KILL] = { "SYS_KILL", 0, "sys_kill()" }, |
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[TOMOYO_SYS_VHANGUP] = { "SYS_VHANGUP", 0, "sys_vhangup()" }, |
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[TOMOYO_SYS_SETTIME] = { "SYS_TIME", 0, "sys_settimeofday()" }, |
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[TOMOYO_SYS_NICE] = { "SYS_NICE", 0, "sys_nice()" }, |
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[TOMOYO_SYS_SETHOSTNAME] = { "SYS_SETHOSTNAME", 0, "sys_sethostname()" }, |
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[TOMOYO_USE_KERNEL_MODULE] = { "use_kernel_module", 0, "kernel_module" }, |
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[TOMOYO_CREATE_FIFO] = { "create_fifo", 0, "mknod(FIFO)" }, |
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[TOMOYO_CREATE_BLOCK_DEV] = { "create_block_dev", 0, "mknod(BDEV)" }, |
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[TOMOYO_CREATE_CHAR_DEV] = { "create_char_dev", 0, "mknod(CDEV)" }, |
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[TOMOYO_CREATE_UNIX_SOCKET] = { "create_unix_socket", 0, "mknod(SOCKET)" }, |
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[TOMOYO_SYS_LINK] = { "SYS_LINK", 0, "sys_link()" }, |
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[TOMOYO_SYS_SYMLINK] = { "SYS_SYMLINK", 0, "sys_symlink()" }, |
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[TOMOYO_SYS_RENAME] = { "SYS_RENAME", 0, "sys_rename()" }, |
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[TOMOYO_SYS_UNLINK] = { "SYS_UNLINK", 0, "sys_unlink()" }, |
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[TOMOYO_SYS_CHMOD] = { "SYS_CHMOD", 0, "sys_chmod()" }, |
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[TOMOYO_SYS_CHOWN] = { "SYS_CHOWN", 0, "sys_chown()" }, |
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[TOMOYO_SYS_IOCTL] = { "SYS_IOCTL", 0, "sys_ioctl()" }, |
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[TOMOYO_SYS_KEXEC_LOAD] = { "SYS_KEXEC_LOAD", 0, "sys_kexec_load()" }, |
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}; |
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typedef struct { |
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unsigned char value[TOMOYO_MAX_CAPABILITY_INDEX]; |
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} PROFILE; |
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static PROFILE *profile_ptr[MAX_PROFILES]; |
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/************************* UTILITY FUNCTIONS *************************/ |
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const char *capability2keyword(const unsigned int capability) |
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{ |
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return capability < TOMOYO_MAX_CAPABILITY_INDEX ? capability_control_array[capability].keyword : NULL; |
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} |
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static const char *capability2name(const unsigned int capability) |
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{ |
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return capability < TOMOYO_MAX_CAPABILITY_INDEX ? capability_control_array[capability].capability_name : NULL; |
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} |
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/* Check whether the given capability control is enabled. */ |
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static unsigned int CheckCapabilityFlags(const unsigned int index) |
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{ |
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const u8 profile = current->domain_info->profile; |
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return sbin_init_started && index < TOMOYO_MAX_CAPABILITY_INDEX && profile < MAX_PROFILES && profile_ptr[profile] ? profile_ptr[profile]->value[index] : 0; |
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} |
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/* Check whether the given capability control is enforce mode. */ |
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static unsigned int CheckCapabilityEnforce(const unsigned int index) |
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{ |
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return CheckCapabilityFlags(index) == 3; |
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} |
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/* Check whether the given capability control is accept mode. */ |
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static unsigned int CheckCapabilityAccept(const unsigned int index) |
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{ |
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return CheckCapabilityFlags(index) == 1; |
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} |
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static PROFILE *FindOrAssignNewProfile(const unsigned int profile) |
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{ |
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static DECLARE_MUTEX(profile_lock); |
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PROFILE *ptr = NULL; |
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down(&profile_lock); |
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if (profile < MAX_PROFILES && (ptr = profile_ptr[profile]) == NULL) { |
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if ((ptr = (PROFILE *) alloc_element(sizeof(PROFILE))) != NULL) { |
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int i; |
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for (i = 0; i < TOMOYO_MAX_CAPABILITY_INDEX; i++) ptr->value[i] = capability_control_array[i].current_value; |
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mb(); /* Instead of using spinlock. */ |
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profile_ptr[profile] = ptr; |
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} |
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} |
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up(&profile_lock); |
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return ptr; |
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} |
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int SetCapabilityStatus(const char *data, unsigned int value, const unsigned int profile) |
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{ |
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int i; |
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PROFILE *ptr = FindOrAssignNewProfile(profile); |
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if (!ptr) return -EINVAL; |
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for (i = 0; i < TOMOYO_MAX_CAPABILITY_INDEX; i++) { |
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if (strcmp(data, capability_control_array[i].keyword)) continue; |
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if (value > 3) value = 3; |
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ptr->value[i] = value; |
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return 0; |
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} |
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return -EINVAL; |
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} |
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int ReadCapabilityStatus(IO_BUFFER *head) |
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{ |
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int step; |
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for (step = head->read_step; step < MAX_PROFILES * TOMOYO_MAX_CAPABILITY_INDEX; step++) { |
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const int i = step / TOMOYO_MAX_CAPABILITY_INDEX, j = step % TOMOYO_MAX_CAPABILITY_INDEX; |
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const PROFILE *profile = profile_ptr[i]; |
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head->read_step = step; |
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if (!profile) continue; |
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if (io_printf(head, "%u-" KEYWORD_MAC_FOR_CAPABILITY "%s=%u\n", i, capability_control_array[j].keyword, profile->value[j])) break; |
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} |
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return step < MAX_PROFILES * TOMOYO_MAX_CAPABILITY_INDEX ? -ENOMEM : 0; |
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} |
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/************************* AUDIT FUNCTIONS *************************/ |
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#ifdef CONFIG_TOMOYO_AUDIT |
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static int AuditCapabilityLog(const unsigned int capability, const int is_granted) |
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{ |
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char *buf; |
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int len = 64; |
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if (CanSaveAuditLog(is_granted) < 0) return -ENOMEM; |
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if ((buf = InitAuditLog(&len)) == NULL) return -ENOMEM; |
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snprintf(buf + strlen(buf), len - strlen(buf) - 1, KEYWORD_ALLOW_CAPABILITY "%s\n", capability2keyword(capability)); |
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return WriteAuditLog(buf, is_granted); |
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} |
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#else |
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static inline void AuditCapabilityLog(const unsigned int capability, const int is_granted) {} |
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#endif |
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/************************* CAPABILITY ACL HANDLER *************************/ |
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static int AddCapabilityACL(const unsigned int capability, struct domain_info *domain, const int is_delete, const struct condition_list *condition) |
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{ |
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struct acl_info *ptr; |
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int error = -ENOMEM; |
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const u16 hash = capability; |
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if (!domain) return -EINVAL; |
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down(&domain_acl_lock); |
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if (!is_delete) { |
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if ((ptr = domain->first_acl_ptr) == NULL) goto first_entry; |
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while (1) { |
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CAPABILITY_ACL_RECORD *new_ptr; |
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if (ptr->type == TYPE_CAPABILITY_ACL && ptr->u.w == hash && ptr->cond == condition) { |
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ptr->is_deleted = 0; |
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/* Found. Nothing to do. */ |
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error = 0; |
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break; |
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} |
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if (ptr->next) { |
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ptr = ptr->next; |
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continue; |
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} |
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first_entry: ; |
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/* Not found. Append it to the tail. */ |
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if ((new_ptr = (CAPABILITY_ACL_RECORD *) alloc_element(sizeof(CAPABILITY_ACL_RECORD))) == NULL) break; |
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new_ptr->head.type = TYPE_CAPABILITY_ACL; |
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new_ptr->head.u.w = hash; |
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new_ptr->head.cond = condition; |
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error = AddDomainACL(ptr, domain, (struct acl_info *) new_ptr); |
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break; |
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} |
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} else { |
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error = -ENOENT; |
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for (ptr = domain->first_acl_ptr; ptr; ptr = ptr->next) { |
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if (ptr->type != TYPE_CAPABILITY_ACL || ptr->is_deleted || ptr->u.w != hash || ptr->cond != condition) continue; |
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error = DelDomainACL(ptr); |
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break; |
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} |
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} |
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up(&domain_acl_lock); |
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return error; |
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} |
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int CheckCapabilityACL(const unsigned int capability) |
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{ |
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struct domain_info * const domain = current->domain_info; |
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struct acl_info *ptr; |
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const int is_enforce = CheckCapabilityEnforce(capability); |
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const u16 hash = capability; |
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if (!CheckCapabilityFlags(capability)) return 0; |
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for (ptr = domain->first_acl_ptr; ptr; ptr = ptr->next) { |
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if (ptr->type != TYPE_CAPABILITY_ACL || ptr->is_deleted || ptr->u.w != hash || CheckCondition(ptr->cond, NULL)) continue; |
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AuditCapabilityLog(capability, 1); |
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return 0; |
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} |
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if (TomoyoVerboseMode()) { |
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printk("TOMOYO-%s: %s denied for %s\n", GetMSG(is_enforce), capability2name(capability), GetLastName(domain)); |
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} |
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AuditCapabilityLog(capability, 0); |
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if (is_enforce) return CheckSupervisor("%s\n" KEYWORD_ALLOW_CAPABILITY "%s\n", domain->domainname->name, capability2keyword(capability)); |
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if (CheckCapabilityAccept(capability)) AddCapabilityACL(capability, domain, 0, NULL); |
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return 0; |
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} |
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int AddCapabilityPolicy(char *data, struct domain_info *domain, const int is_delete) |
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{ |
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unsigned int capability; |
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const struct condition_list *condition = NULL; |
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char *cp = FindConditionPart(data); |
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if (cp && (condition = FindOrAssignNewCondition(cp)) == NULL) return -EINVAL; |
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for (capability = 0; capability < TOMOYO_MAX_CAPABILITY_INDEX; capability++) { |
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if (strcmp(data, capability_control_array[capability].keyword) == 0) { |
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return AddCapabilityACL(capability, domain, is_delete, condition); |
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} |
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} |
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return -EINVAL; |
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} |
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EXPORT_SYMBOL(CheckCapabilityACL); |
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/***** TOMOYO Linux end. *****/ |
TOMOYO
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