| /* |
| * security/tomoyo/domain.c |
| * |
| * Implementation of the Domain-Based Mandatory Access Control. |
| * |
| * Copyright (C) 2005-2009 NTT DATA CORPORATION |
| * |
| * Version: 2.2.0 2009/04/01 |
| * |
| */ |
| |
| #include "common.h" |
| #include "tomoyo.h" |
| #include "realpath.h" |
| #include <linux/binfmts.h> |
| |
| /* Variables definitions.*/ |
| |
| /* The initial domain. */ |
| struct tomoyo_domain_info tomoyo_kernel_domain; |
| |
| /* |
| * tomoyo_domain_list is used for holding list of domains. |
| * The ->acl_info_list of "struct tomoyo_domain_info" is used for holding |
| * permissions (e.g. "allow_read /lib/libc-2.5.so") given to each domain. |
| * |
| * An entry is added by |
| * |
| * # ( echo "<kernel>"; echo "allow_execute /sbin/init" ) > \ |
| * /sys/kernel/security/tomoyo/domain_policy |
| * |
| * and is deleted by |
| * |
| * # ( echo "<kernel>"; echo "delete allow_execute /sbin/init" ) > \ |
| * /sys/kernel/security/tomoyo/domain_policy |
| * |
| * and all entries are retrieved by |
| * |
| * # cat /sys/kernel/security/tomoyo/domain_policy |
| * |
| * A domain is added by |
| * |
| * # echo "<kernel>" > /sys/kernel/security/tomoyo/domain_policy |
| * |
| * and is deleted by |
| * |
| * # echo "delete <kernel>" > /sys/kernel/security/tomoyo/domain_policy |
| * |
| * and all domains are retrieved by |
| * |
| * # grep '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
| * |
| * Normally, a domainname is monotonically getting longer because a domainname |
| * which the process will belong to if an execve() operation succeeds is |
| * defined as a concatenation of "current domainname" + "pathname passed to |
| * execve()". |
| * See tomoyo_domain_initializer_list and tomoyo_domain_keeper_list for |
| * exceptions. |
| */ |
| LIST_HEAD(tomoyo_domain_list); |
| DECLARE_RWSEM(tomoyo_domain_list_lock); |
| |
| /* |
| * tomoyo_domain_initializer_entry is a structure which is used for holding |
| * "initialize_domain" and "no_initialize_domain" entries. |
| * It has following fields. |
| * |
| * (1) "list" which is linked to tomoyo_domain_initializer_list . |
| * (2) "domainname" which is "a domainname" or "the last component of a |
| * domainname". This field is NULL if "from" clause is not specified. |
| * (3) "program" which is a program's pathname. |
| * (4) "is_deleted" is a bool which is true if marked as deleted, false |
| * otherwise. |
| * (5) "is_not" is a bool which is true if "no_initialize_domain", false |
| * otherwise. |
| * (6) "is_last_name" is a bool which is true if "domainname" is "the last |
| * component of a domainname", false otherwise. |
| */ |
| struct tomoyo_domain_initializer_entry { |
| struct list_head list; |
| const struct tomoyo_path_info *domainname; /* This may be NULL */ |
| const struct tomoyo_path_info *program; |
| bool is_deleted; |
| bool is_not; /* True if this entry is "no_initialize_domain". */ |
| /* True if the domainname is tomoyo_get_last_name(). */ |
| bool is_last_name; |
| }; |
| |
| /* |
| * tomoyo_domain_keeper_entry is a structure which is used for holding |
| * "keep_domain" and "no_keep_domain" entries. |
| * It has following fields. |
| * |
| * (1) "list" which is linked to tomoyo_domain_keeper_list . |
| * (2) "domainname" which is "a domainname" or "the last component of a |
| * domainname". |
| * (3) "program" which is a program's pathname. |
| * This field is NULL if "from" clause is not specified. |
| * (4) "is_deleted" is a bool which is true if marked as deleted, false |
| * otherwise. |
| * (5) "is_not" is a bool which is true if "no_initialize_domain", false |
| * otherwise. |
| * (6) "is_last_name" is a bool which is true if "domainname" is "the last |
| * component of a domainname", false otherwise. |
| */ |
| struct tomoyo_domain_keeper_entry { |
| struct list_head list; |
| const struct tomoyo_path_info *domainname; |
| const struct tomoyo_path_info *program; /* This may be NULL */ |
| bool is_deleted; |
| bool is_not; /* True if this entry is "no_keep_domain". */ |
| /* True if the domainname is tomoyo_get_last_name(). */ |
| bool is_last_name; |
| }; |
| |
| /* |
| * tomoyo_alias_entry is a structure which is used for holding "alias" entries. |
| * It has following fields. |
| * |
| * (1) "list" which is linked to tomoyo_alias_list . |
| * (2) "original_name" which is a dereferenced pathname. |
| * (3) "aliased_name" which is a symlink's pathname. |
| * (4) "is_deleted" is a bool which is true if marked as deleted, false |
| * otherwise. |
| */ |
| struct tomoyo_alias_entry { |
| struct list_head list; |
| const struct tomoyo_path_info *original_name; |
| const struct tomoyo_path_info *aliased_name; |
| bool is_deleted; |
| }; |
| |
| /** |
| * tomoyo_set_domain_flag - Set or clear domain's attribute flags. |
| * |
| * @domain: Pointer to "struct tomoyo_domain_info". |
| * @is_delete: True if it is a delete request. |
| * @flags: Flags to set or clear. |
| * |
| * Returns nothing. |
| */ |
| void tomoyo_set_domain_flag(struct tomoyo_domain_info *domain, |
| const bool is_delete, const u8 flags) |
| { |
| /* We need to serialize because this is bitfield operation. */ |
| static DEFINE_SPINLOCK(lock); |
| spin_lock(&lock); |
| if (!is_delete) |
| domain->flags |= flags; |
| else |
| domain->flags &= ~flags; |
| spin_unlock(&lock); |
| } |
| |
| /** |
| * tomoyo_get_last_name - Get last component of a domainname. |
| * |
| * @domain: Pointer to "struct tomoyo_domain_info". |
| * |
| * Returns the last component of the domainname. |
| */ |
| const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain) |
| { |
| const char *cp0 = domain->domainname->name; |
| const char *cp1 = strrchr(cp0, ' '); |
| |
| if (cp1) |
| return cp1 + 1; |
| return cp0; |
| } |
| |
| /* |
| * tomoyo_domain_initializer_list is used for holding list of programs which |
| * triggers reinitialization of domainname. Normally, a domainname is |
| * monotonically getting longer. But sometimes, we restart daemon programs. |
| * It would be convenient for us that "a daemon started upon system boot" and |
| * "the daemon restarted from console" belong to the same domain. Thus, TOMOYO |
| * provides a way to shorten domainnames. |
| * |
| * An entry is added by |
| * |
| * # echo 'initialize_domain /usr/sbin/httpd' > \ |
| * /sys/kernel/security/tomoyo/exception_policy |
| * |
| * and is deleted by |
| * |
| * # echo 'delete initialize_domain /usr/sbin/httpd' > \ |
| * /sys/kernel/security/tomoyo/exception_policy |
| * |
| * and all entries are retrieved by |
| * |
| * # grep ^initialize_domain /sys/kernel/security/tomoyo/exception_policy |
| * |
| * In the example above, /usr/sbin/httpd will belong to |
| * "<kernel> /usr/sbin/httpd" domain. |
| * |
| * You may specify a domainname using "from" keyword. |
| * "initialize_domain /usr/sbin/httpd from <kernel> /etc/rc.d/init.d/httpd" |
| * will cause "/usr/sbin/httpd" executed from "<kernel> /etc/rc.d/init.d/httpd" |
| * domain to belong to "<kernel> /usr/sbin/httpd" domain. |
| * |
| * You may add "no_" prefix to "initialize_domain". |
| * "initialize_domain /usr/sbin/httpd" and |
| * "no_initialize_domain /usr/sbin/httpd from <kernel> /etc/rc.d/init.d/httpd" |
| * will cause "/usr/sbin/httpd" to belong to "<kernel> /usr/sbin/httpd" domain |
| * unless executed from "<kernel> /etc/rc.d/init.d/httpd" domain. |
| */ |
| static LIST_HEAD(tomoyo_domain_initializer_list); |
| static DECLARE_RWSEM(tomoyo_domain_initializer_list_lock); |
| |
| /** |
| * tomoyo_update_domain_initializer_entry - Update "struct tomoyo_domain_initializer_entry" list. |
| * |
| * @domainname: The name of domain. May be NULL. |
| * @program: The name of program. |
| * @is_not: True if it is "no_initialize_domain" entry. |
| * @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_domain_initializer_entry(const char *domainname, |
| const char *program, |
| const bool is_not, |
| const bool is_delete) |
| { |
| struct tomoyo_domain_initializer_entry *new_entry; |
| struct tomoyo_domain_initializer_entry *ptr; |
| const struct tomoyo_path_info *saved_program; |
| const struct tomoyo_path_info *saved_domainname = NULL; |
| int error = -ENOMEM; |
| bool is_last_name = false; |
| |
| if (!tomoyo_is_correct_path(program, 1, -1, -1, __func__)) |
| return -EINVAL; /* No patterns allowed. */ |
| if (domainname) { |
| if (!tomoyo_is_domain_def(domainname) && |
| tomoyo_is_correct_path(domainname, 1, -1, -1, __func__)) |
| is_last_name = true; |
| else if (!tomoyo_is_correct_domain(domainname, __func__)) |
| return -EINVAL; |
| saved_domainname = tomoyo_save_name(domainname); |
| if (!saved_domainname) |
| return -ENOMEM; |
| } |
| saved_program = tomoyo_save_name(program); |
| if (!saved_program) |
| return -ENOMEM; |
| down_write(&tomoyo_domain_initializer_list_lock); |
| list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, list) { |
| if (ptr->is_not != is_not || |
| ptr->domainname != saved_domainname || |
| ptr->program != saved_program) |
| continue; |
| ptr->is_deleted = is_delete; |
| error = 0; |
| goto out; |
| } |
| if (is_delete) { |
| error = -ENOENT; |
| goto out; |
| } |
| new_entry = tomoyo_alloc_element(sizeof(*new_entry)); |
| if (!new_entry) |
| goto out; |
| new_entry->domainname = saved_domainname; |
| new_entry->program = saved_program; |
| new_entry->is_not = is_not; |
| new_entry->is_last_name = is_last_name; |
| list_add_tail_rcu(&new_entry->list, &tomoyo_domain_initializer_list); |
| error = 0; |
| out: |
| up_write(&tomoyo_domain_initializer_list_lock); |
| return error; |
| } |
| |
| /** |
| * tomoyo_read_domain_initializer_policy - Read "struct tomoyo_domain_initializer_entry" list. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns true on success, false otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head) |
| { |
| struct list_head *pos; |
| bool done = true; |
| |
| list_for_each_cookie(pos, head->read_var2, |
| &tomoyo_domain_initializer_list) { |
| const char *no; |
| const char *from = ""; |
| const char *domain = ""; |
| struct tomoyo_domain_initializer_entry *ptr; |
| ptr = list_entry(pos, struct tomoyo_domain_initializer_entry, |
| list); |
| if (ptr->is_deleted) |
| continue; |
| no = ptr->is_not ? "no_" : ""; |
| if (ptr->domainname) { |
| from = " from "; |
| domain = ptr->domainname->name; |
| } |
| done = tomoyo_io_printf(head, |
| "%s" TOMOYO_KEYWORD_INITIALIZE_DOMAIN |
| "%s%s%s\n", no, ptr->program->name, |
| from, domain); |
| if (!done) |
| break; |
| } |
| return done; |
| } |
| |
| /** |
| * tomoyo_write_domain_initializer_policy - Write "struct tomoyo_domain_initializer_entry" list. |
| * |
| * @data: String to parse. |
| * @is_not: True if it is "no_initialize_domain" entry. |
| * @is_delete: True if it is a delete request. |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| int tomoyo_write_domain_initializer_policy(char *data, const bool is_not, |
| const bool is_delete) |
| { |
| char *cp = strstr(data, " from "); |
| |
| if (cp) { |
| *cp = '\0'; |
| return tomoyo_update_domain_initializer_entry(cp + 6, data, |
| is_not, |
| is_delete); |
| } |
| return tomoyo_update_domain_initializer_entry(NULL, data, is_not, |
| is_delete); |
| } |
| |
| /** |
| * tomoyo_is_domain_initializer - Check whether the given program causes domainname reinitialization. |
| * |
| * @domainname: The name of domain. |
| * @program: The name of program. |
| * @last_name: The last component of @domainname. |
| * |
| * Returns true if executing @program reinitializes domain transition, |
| * false otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static bool tomoyo_is_domain_initializer(const struct tomoyo_path_info * |
| domainname, |
| const struct tomoyo_path_info *program, |
| const struct tomoyo_path_info * |
| last_name) |
| { |
| struct tomoyo_domain_initializer_entry *ptr; |
| bool flag = false; |
| |
| list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, list) { |
| if (ptr->is_deleted) |
| continue; |
| if (ptr->domainname) { |
| if (!ptr->is_last_name) { |
| if (ptr->domainname != domainname) |
| continue; |
| } else { |
| if (tomoyo_pathcmp(ptr->domainname, last_name)) |
| continue; |
| } |
| } |
| if (tomoyo_pathcmp(ptr->program, program)) |
| continue; |
| if (ptr->is_not) { |
| flag = false; |
| break; |
| } |
| flag = true; |
| } |
| return flag; |
| } |
| |
| /* |
| * tomoyo_domain_keeper_list is used for holding list of domainnames which |
| * suppresses domain transition. Normally, a domainname is monotonically |
| * getting longer. But sometimes, we want to suppress domain transition. |
| * It would be convenient for us that programs executed from a login session |
| * belong to the same domain. Thus, TOMOYO provides a way to suppress domain |
| * transition. |
| * |
| * An entry is added by |
| * |
| * # echo 'keep_domain <kernel> /usr/sbin/sshd /bin/bash' > \ |
| * /sys/kernel/security/tomoyo/exception_policy |
| * |
| * and is deleted by |
| * |
| * # echo 'delete keep_domain <kernel> /usr/sbin/sshd /bin/bash' > \ |
| * /sys/kernel/security/tomoyo/exception_policy |
| * |
| * and all entries are retrieved by |
| * |
| * # grep ^keep_domain /sys/kernel/security/tomoyo/exception_policy |
| * |
| * In the example above, any process which belongs to |
| * "<kernel> /usr/sbin/sshd /bin/bash" domain will remain in that domain, |
| * unless explicitly specified by "initialize_domain" or "no_keep_domain". |
| * |
| * You may specify a program using "from" keyword. |
| * "keep_domain /bin/pwd from <kernel> /usr/sbin/sshd /bin/bash" |
| * will cause "/bin/pwd" executed from "<kernel> /usr/sbin/sshd /bin/bash" |
| * domain to remain in "<kernel> /usr/sbin/sshd /bin/bash" domain. |
| * |
| * You may add "no_" prefix to "keep_domain". |
| * "keep_domain <kernel> /usr/sbin/sshd /bin/bash" and |
| * "no_keep_domain /usr/bin/passwd from <kernel> /usr/sbin/sshd /bin/bash" will |
| * cause "/usr/bin/passwd" to belong to |
| * "<kernel> /usr/sbin/sshd /bin/bash /usr/bin/passwd" domain, unless |
| * explicitly specified by "initialize_domain". |
| */ |
| static LIST_HEAD(tomoyo_domain_keeper_list); |
| static DECLARE_RWSEM(tomoyo_domain_keeper_list_lock); |
| |
| /** |
| * tomoyo_update_domain_keeper_entry - Update "struct tomoyo_domain_keeper_entry" list. |
| * |
| * @domainname: The name of domain. |
| * @program: The name of program. May be NULL. |
| * @is_not: True if it is "no_keep_domain" entry. |
| * @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_domain_keeper_entry(const char *domainname, |
| const char *program, |
| const bool is_not, |
| const bool is_delete) |
| { |
| struct tomoyo_domain_keeper_entry *new_entry; |
| struct tomoyo_domain_keeper_entry *ptr; |
| const struct tomoyo_path_info *saved_domainname; |
| const struct tomoyo_path_info *saved_program = NULL; |
| int error = -ENOMEM; |
| bool is_last_name = false; |
| |
| if (!tomoyo_is_domain_def(domainname) && |
| tomoyo_is_correct_path(domainname, 1, -1, -1, __func__)) |
| is_last_name = true; |
| else if (!tomoyo_is_correct_domain(domainname, __func__)) |
| return -EINVAL; |
| if (program) { |
| if (!tomoyo_is_correct_path(program, 1, -1, -1, __func__)) |
| return -EINVAL; |
| saved_program = tomoyo_save_name(program); |
| if (!saved_program) |
| return -ENOMEM; |
| } |
| saved_domainname = tomoyo_save_name(domainname); |
| if (!saved_domainname) |
| return -ENOMEM; |
| down_write(&tomoyo_domain_keeper_list_lock); |
| list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) { |
| if (ptr->is_not != is_not || |
| ptr->domainname != saved_domainname || |
| ptr->program != saved_program) |
| continue; |
| ptr->is_deleted = is_delete; |
| error = 0; |
| goto out; |
| } |
| if (is_delete) { |
| error = -ENOENT; |
| goto out; |
| } |
| new_entry = tomoyo_alloc_element(sizeof(*new_entry)); |
| if (!new_entry) |
| goto out; |
| new_entry->domainname = saved_domainname; |
| new_entry->program = saved_program; |
| new_entry->is_not = is_not; |
| new_entry->is_last_name = is_last_name; |
| list_add_tail_rcu(&new_entry->list, &tomoyo_domain_keeper_list); |
| error = 0; |
| out: |
| up_write(&tomoyo_domain_keeper_list_lock); |
| return error; |
| } |
| |
| /** |
| * tomoyo_write_domain_keeper_policy - Write "struct tomoyo_domain_keeper_entry" list. |
| * |
| * @data: String to parse. |
| * @is_not: True if it is "no_keep_domain" entry. |
| * @is_delete: True if it is a delete request. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| int tomoyo_write_domain_keeper_policy(char *data, const bool is_not, |
| const bool is_delete) |
| { |
| char *cp = strstr(data, " from "); |
| |
| if (cp) { |
| *cp = '\0'; |
| return tomoyo_update_domain_keeper_entry(cp + 6, data, is_not, |
| is_delete); |
| } |
| return tomoyo_update_domain_keeper_entry(data, NULL, is_not, is_delete); |
| } |
| |
| /** |
| * tomoyo_read_domain_keeper_policy - Read "struct tomoyo_domain_keeper_entry" list. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns true on success, false otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head) |
| { |
| struct list_head *pos; |
| bool done = true; |
| |
| list_for_each_cookie(pos, head->read_var2, |
| &tomoyo_domain_keeper_list) { |
| struct tomoyo_domain_keeper_entry *ptr; |
| const char *no; |
| const char *from = ""; |
| const char *program = ""; |
| |
| ptr = list_entry(pos, struct tomoyo_domain_keeper_entry, list); |
| if (ptr->is_deleted) |
| continue; |
| no = ptr->is_not ? "no_" : ""; |
| if (ptr->program) { |
| from = " from "; |
| program = ptr->program->name; |
| } |
| done = tomoyo_io_printf(head, |
| "%s" TOMOYO_KEYWORD_KEEP_DOMAIN |
| "%s%s%s\n", no, program, from, |
| ptr->domainname->name); |
| if (!done) |
| break; |
| } |
| return done; |
| } |
| |
| /** |
| * tomoyo_is_domain_keeper - Check whether the given program causes domain transition suppression. |
| * |
| * @domainname: The name of domain. |
| * @program: The name of program. |
| * @last_name: The last component of @domainname. |
| * |
| * Returns true if executing @program supresses domain transition, |
| * false otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| static bool tomoyo_is_domain_keeper(const struct tomoyo_path_info *domainname, |
| const struct tomoyo_path_info *program, |
| const struct tomoyo_path_info *last_name) |
| { |
| struct tomoyo_domain_keeper_entry *ptr; |
| bool flag = false; |
| |
| list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) { |
| if (ptr->is_deleted) |
| continue; |
| if (!ptr->is_last_name) { |
| if (ptr->domainname != domainname) |
| continue; |
| } else { |
| if (tomoyo_pathcmp(ptr->domainname, last_name)) |
| continue; |
| } |
| if (ptr->program && tomoyo_pathcmp(ptr->program, program)) |
| continue; |
| if (ptr->is_not) { |
| flag = false; |
| break; |
| } |
| flag = true; |
| } |
| return flag; |
| } |
| |
| /* |
| * tomoyo_alias_list is used for holding list of symlink's pathnames which are |
| * allowed to be passed to an execve() request. Normally, the domainname which |
| * the current process will belong to after execve() succeeds is calculated |
| * using dereferenced pathnames. But some programs behave differently depending |
| * on the name passed to argv[0]. For busybox, calculating domainname using |
| * dereferenced pathnames will cause all programs in the busybox to belong to |
| * the same domain. Thus, TOMOYO provides a way to allow use of symlink's |
| * pathname for checking execve()'s permission and calculating domainname which |
| * the current process will belong to after execve() succeeds. |
| * |
| * An entry is added by |
| * |
| * # echo 'alias /bin/busybox /bin/cat' > \ |
| * /sys/kernel/security/tomoyo/exception_policy |
| * |
| * and is deleted by |
| * |
| * # echo 'delete alias /bin/busybox /bin/cat' > \ |
| * /sys/kernel/security/tomoyo/exception_policy |
| * |
| * and all entries are retrieved by |
| * |
| * # grep ^alias /sys/kernel/security/tomoyo/exception_policy |
| * |
| * In the example above, if /bin/cat is a symlink to /bin/busybox and execution |
| * of /bin/cat is requested, permission is checked for /bin/cat rather than |
| * /bin/busybox and domainname which the current process will belong to after |
| * execve() succeeds is calculated using /bin/cat rather than /bin/busybox . |
| */ |
| static LIST_HEAD(tomoyo_alias_list); |
| static DECLARE_RWSEM(tomoyo_alias_list_lock); |
| |
| /** |
| * tomoyo_update_alias_entry - Update "struct tomoyo_alias_entry" list. |
| * |
| * @original_name: The original program's real name. |
| * @aliased_name: The symbolic program's symbolic link's name. |
| * @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_alias_entry(const char *original_name, |
| const char *aliased_name, |
| const bool is_delete) |
| { |
| struct tomoyo_alias_entry *new_entry; |
| struct tomoyo_alias_entry *ptr; |
| const struct tomoyo_path_info *saved_original_name; |
| const struct tomoyo_path_info *saved_aliased_name; |
| int error = -ENOMEM; |
| |
| if (!tomoyo_is_correct_path(original_name, 1, -1, -1, __func__) || |
| !tomoyo_is_correct_path(aliased_name, 1, -1, -1, __func__)) |
| return -EINVAL; /* No patterns allowed. */ |
| saved_original_name = tomoyo_save_name(original_name); |
| saved_aliased_name = tomoyo_save_name(aliased_name); |
| if (!saved_original_name || !saved_aliased_name) |
| return -ENOMEM; |
| down_write(&tomoyo_alias_list_lock); |
| list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) { |
| if (ptr->original_name != saved_original_name || |
| ptr->aliased_name != saved_aliased_name) |
| continue; |
| ptr->is_deleted = is_delete; |
| error = 0; |
| goto out; |
| } |
| if (is_delete) { |
| error = -ENOENT; |
| goto out; |
| } |
| new_entry = tomoyo_alloc_element(sizeof(*new_entry)); |
| if (!new_entry) |
| goto out; |
| new_entry->original_name = saved_original_name; |
| new_entry->aliased_name = saved_aliased_name; |
| list_add_tail_rcu(&new_entry->list, &tomoyo_alias_list); |
| error = 0; |
| out: |
| up_write(&tomoyo_alias_list_lock); |
| return error; |
| } |
| |
| /** |
| * tomoyo_read_alias_policy - Read "struct tomoyo_alias_entry" list. |
| * |
| * @head: Pointer to "struct tomoyo_io_buffer". |
| * |
| * Returns true on success, false otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head) |
| { |
| struct list_head *pos; |
| bool done = true; |
| |
| list_for_each_cookie(pos, head->read_var2, &tomoyo_alias_list) { |
| struct tomoyo_alias_entry *ptr; |
| |
| ptr = list_entry(pos, struct tomoyo_alias_entry, list); |
| if (ptr->is_deleted) |
| continue; |
| done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALIAS "%s %s\n", |
| ptr->original_name->name, |
| ptr->aliased_name->name); |
| if (!done) |
| break; |
| } |
| return done; |
| } |
| |
| /** |
| * tomoyo_write_alias_policy - Write "struct tomoyo_alias_entry" list. |
| * |
| * @data: String to parse. |
| * @is_delete: True if it is a delete request. |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| int tomoyo_write_alias_policy(char *data, const bool is_delete) |
| { |
| char *cp = strchr(data, ' '); |
| |
| if (!cp) |
| return -EINVAL; |
| *cp++ = '\0'; |
| return tomoyo_update_alias_entry(data, cp, is_delete); |
| } |
| |
| /** |
| * tomoyo_find_or_assign_new_domain - Create a domain. |
| * |
| * @domainname: The name of domain. |
| * @profile: Profile number to assign if the domain was newly created. |
| * |
| * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char * |
| domainname, |
| const u8 profile) |
| { |
| struct tomoyo_domain_info *domain = NULL; |
| const struct tomoyo_path_info *saved_domainname; |
| |
| down_write(&tomoyo_domain_list_lock); |
| domain = tomoyo_find_domain(domainname); |
| if (domain) |
| goto out; |
| if (!tomoyo_is_correct_domain(domainname, __func__)) |
| goto out; |
| saved_domainname = tomoyo_save_name(domainname); |
| if (!saved_domainname) |
| goto out; |
| /* Can I reuse memory of deleted domain? */ |
| list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
| struct task_struct *p; |
| struct tomoyo_acl_info *ptr; |
| bool flag; |
| if (!domain->is_deleted || |
| domain->domainname != saved_domainname) |
| continue; |
| flag = false; |
| read_lock(&tasklist_lock); |
| for_each_process(p) { |
| if (tomoyo_real_domain(p) != domain) |
| continue; |
| flag = true; |
| break; |
| } |
| read_unlock(&tasklist_lock); |
| if (flag) |
| continue; |
| list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
| ptr->type |= TOMOYO_ACL_DELETED; |
| } |
| tomoyo_set_domain_flag(domain, true, domain->flags); |
| domain->profile = profile; |
| domain->quota_warned = false; |
| mb(); /* Avoid out-of-order execution. */ |
| domain->is_deleted = false; |
| goto out; |
| } |
| /* No memory reusable. Create using new memory. */ |
| domain = tomoyo_alloc_element(sizeof(*domain)); |
| if (domain) { |
| INIT_LIST_HEAD(&domain->acl_info_list); |
| domain->domainname = saved_domainname; |
| domain->profile = profile; |
| list_add_tail_rcu(&domain->list, &tomoyo_domain_list); |
| } |
| out: |
| up_write(&tomoyo_domain_list_lock); |
| return domain; |
| } |
| |
| /** |
| * tomoyo_find_next_domain - Find a domain. |
| * |
| * @bprm: Pointer to "struct linux_binprm". |
| * |
| * Returns 0 on success, negative value otherwise. |
| * |
| * Caller holds tomoyo_read_lock(). |
| */ |
| int tomoyo_find_next_domain(struct linux_binprm *bprm) |
| { |
| /* |
| * This function assumes that the size of buffer returned by |
| * tomoyo_realpath() = TOMOYO_MAX_PATHNAME_LEN. |
| */ |
| struct tomoyo_page_buffer *tmp = tomoyo_alloc(sizeof(*tmp)); |
| struct tomoyo_domain_info *old_domain = tomoyo_domain(); |
| struct tomoyo_domain_info *domain = NULL; |
| const char *old_domain_name = old_domain->domainname->name; |
| const char *original_name = bprm->filename; |
| char *new_domain_name = NULL; |
| char *real_program_name = NULL; |
| char *symlink_program_name = NULL; |
| const u8 mode = tomoyo_check_flags(old_domain, TOMOYO_MAC_FOR_FILE); |
| const bool is_enforce = (mode == 3); |
| int retval = -ENOMEM; |
| struct tomoyo_path_info r; /* real name */ |
| struct tomoyo_path_info s; /* symlink name */ |
| struct tomoyo_path_info l; /* last name */ |
| static bool initialized; |
| |
| if (!tmp) |
| goto out; |
| |
| if (!initialized) { |
| /* |
| * Built-in initializers. This is needed because policies are |
| * not loaded until starting /sbin/init. |
| */ |
| tomoyo_update_domain_initializer_entry(NULL, "/sbin/hotplug", |
| false, false); |
| tomoyo_update_domain_initializer_entry(NULL, "/sbin/modprobe", |
| false, false); |
| initialized = true; |
| } |
| |
| /* Get tomoyo_realpath of program. */ |
| retval = -ENOENT; |
| /* I hope tomoyo_realpath() won't fail with -ENOMEM. */ |
| real_program_name = tomoyo_realpath(original_name); |
| if (!real_program_name) |
| goto out; |
| /* Get tomoyo_realpath of symbolic link. */ |
| symlink_program_name = tomoyo_realpath_nofollow(original_name); |
| if (!symlink_program_name) |
| goto out; |
| |
| r.name = real_program_name; |
| tomoyo_fill_path_info(&r); |
| s.name = symlink_program_name; |
| tomoyo_fill_path_info(&s); |
| l.name = tomoyo_get_last_name(old_domain); |
| tomoyo_fill_path_info(&l); |
| |
| /* Check 'alias' directive. */ |
| if (tomoyo_pathcmp(&r, &s)) { |
| struct tomoyo_alias_entry *ptr; |
| /* Is this program allowed to be called via symbolic links? */ |
| list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) { |
| if (ptr->is_deleted || |
| tomoyo_pathcmp(&r, ptr->original_name) || |
| tomoyo_pathcmp(&s, ptr->aliased_name)) |
| continue; |
| memset(real_program_name, 0, TOMOYO_MAX_PATHNAME_LEN); |
| strncpy(real_program_name, ptr->aliased_name->name, |
| TOMOYO_MAX_PATHNAME_LEN - 1); |
| tomoyo_fill_path_info(&r); |
| break; |
| } |
| } |
| |
| /* Check execute permission. */ |
| retval = tomoyo_check_exec_perm(old_domain, &r); |
| if (retval < 0) |
| goto out; |
| |
| new_domain_name = tmp->buffer; |
| if (tomoyo_is_domain_initializer(old_domain->domainname, &r, &l)) { |
| /* Transit to the child of tomoyo_kernel_domain domain. */ |
| snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, |
| TOMOYO_ROOT_NAME " " "%s", real_program_name); |
| } else if (old_domain == &tomoyo_kernel_domain && |
| !tomoyo_policy_loaded) { |
| /* |
| * Needn't to transit from kernel domain before starting |
| * /sbin/init. But transit from kernel domain if executing |
| * initializers because they might start before /sbin/init. |
| */ |
| domain = old_domain; |
| } else if (tomoyo_is_domain_keeper(old_domain->domainname, &r, &l)) { |
| /* Keep current domain. */ |
| domain = old_domain; |
| } else { |
| /* Normal domain transition. */ |
| snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, |
| "%s %s", old_domain_name, real_program_name); |
| } |
| if (domain || strlen(new_domain_name) >= TOMOYO_MAX_PATHNAME_LEN) |
| goto done; |
| domain = tomoyo_find_domain(new_domain_name); |
| if (domain) |
| goto done; |
| if (is_enforce) |
| goto done; |
| domain = tomoyo_find_or_assign_new_domain(new_domain_name, |
| old_domain->profile); |
| done: |
| if (domain) |
| goto out; |
| printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", |
| new_domain_name); |
| if (is_enforce) |
| retval = -EPERM; |
| else |
| tomoyo_set_domain_flag(old_domain, false, |
| TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED); |
| out: |
| if (!domain) |
| domain = old_domain; |
| bprm->cred->security = domain; |
| tomoyo_free(real_program_name); |
| tomoyo_free(symlink_program_name); |
| tomoyo_free(tmp); |
| return retval; |
| } |