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kumaneko |
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/* |
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* fs/tomoyo_exec.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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kumaneko |
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* Version: 1.3.3 2007/04/01 |
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kumaneko |
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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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/************************* AUDIT FUNCTIONS *************************/ |
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#ifdef CONFIG_TOMOYO_AUDIT |
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static int AuditArgv0Log(const struct path_info *filename, const char *argv0, const int is_granted) |
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{ |
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char *buf; |
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int len; |
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if (CanSaveAuditLog(is_granted) < 0) return -ENOMEM; |
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len = filename->total_len + strlen(argv0) + 8; |
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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_ARGV0 "%s %s\n", filename->name, argv0); |
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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 AuditArgv0Log(const struct path_info *filename, const char *argv0, const int is_granted) {} |
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#endif |
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/************************* ARGV0 MISMATCH HANDLER *************************/ |
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kumaneko |
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static int AddArgv0Entry(const char *filename, const char *argv0, struct domain_info *domain, const u8 is_add, const struct condition_list *condition) |
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kumaneko |
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{ |
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struct acl_info *ptr; |
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const struct path_info *saved_filename, *saved_argv0; |
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int error = -ENOMEM; |
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if (!IsCorrectPath(filename, 1, 0, -1, __FUNCTION__) || !IsCorrectPath(argv0, -1, 0, -1, __FUNCTION__) || strchr(argv0, '/')) return -EINVAL; |
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if ((saved_filename = SaveName(filename)) == NULL || (saved_argv0 = SaveName(argv0)) == NULL) return -ENOMEM; |
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down(&domain_acl_lock); |
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kumaneko |
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if (is_add) { |
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kumaneko |
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if ((ptr = domain->first_acl_ptr) == NULL) goto first_entry; |
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while (1) { |
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ARGV0_ACL_RECORD *new_ptr; |
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if (ptr->type == TYPE_ARGV0_ACL && ptr->cond == condition) { |
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if (((ARGV0_ACL_RECORD *) ptr)->filename == saved_filename && ((ARGV0_ACL_RECORD *) ptr)->argv0 == saved_argv0) { |
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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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} |
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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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kumaneko |
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if (is_add == 1 && TooManyDomainACL(domain)) break; |
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kumaneko |
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/* Not found. Append it to the tail. */ |
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if ((new_ptr = (ARGV0_ACL_RECORD *) alloc_element(sizeof(ARGV0_ACL_RECORD))) == NULL) break; |
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new_ptr->head.type = TYPE_ARGV0_ACL; |
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new_ptr->head.cond = condition; |
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new_ptr->filename = saved_filename; |
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new_ptr->argv0 = saved_argv0; |
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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_ARGV0_ACL || ptr->is_deleted || ptr->cond != condition) continue; |
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if (((ARGV0_ACL_RECORD *) ptr)->filename != saved_filename || ((ARGV0_ACL_RECORD *) ptr)->argv0 != saved_argv0) 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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static int CheckArgv0ACL(const struct path_info *filename, const char *argv0_) |
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{ |
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const struct domain_info *domain = current->domain_info; |
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int error = -EPERM; |
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struct acl_info *ptr; |
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struct path_info argv0; |
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if (!CheckCCSFlags(CCS_TOMOYO_MAC_FOR_ARGV0)) return 0; |
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argv0.name = argv0_; |
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fill_path_info(&argv0); |
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for (ptr = domain->first_acl_ptr; ptr; ptr = ptr->next) { |
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if (ptr->type == TYPE_ARGV0_ACL && ptr->is_deleted == 0 && CheckCondition(ptr->cond, NULL) == 0 && |
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PathMatchesToPattern(filename, ((ARGV0_ACL_RECORD *) ptr)->filename) && |
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PathMatchesToPattern(&argv0, ((ARGV0_ACL_RECORD *) ptr)->argv0)) { |
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error = 0; |
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break; |
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} |
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} |
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return error; |
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} |
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int CheckArgv0Perm(const struct path_info *filename, const char *argv0) |
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{ |
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int error = 0; |
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if (!CheckCCSFlags(CCS_TOMOYO_MAC_FOR_ARGV0)) return 0; |
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kumaneko |
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if (!filename || !argv0 || !*argv0) return 0; |
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kumaneko |
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error = CheckArgv0ACL(filename, argv0); |
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AuditArgv0Log(filename, argv0, !error); |
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if (error) { |
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struct domain_info * const domain = current->domain_info; |
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const int is_enforce = CheckCCSEnforce(CCS_TOMOYO_MAC_FOR_ARGV0); |
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if (TomoyoVerboseMode()) { |
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printk("TOMOYO-%s: Run %s as %s denied for %s\n", GetMSG(is_enforce), filename->name, argv0, GetLastName(domain)); |
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} |
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if (is_enforce) error = CheckSupervisor("%s\n" KEYWORD_ALLOW_ARGV0 "%s %s\n", domain->domainname->name, filename->name, argv0); |
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kumaneko |
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else if (CheckCCSAccept(CCS_TOMOYO_MAC_FOR_ARGV0)) AddArgv0Entry(filename->name, argv0, domain, 1, NULL); |
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kumaneko |
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if (!is_enforce) error = 0; |
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} |
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return error; |
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} |
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int AddArgv0Policy(char *data, struct domain_info *domain, const int is_delete) |
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{ |
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char *argv0 = strchr(data, ' '); |
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char *cp; |
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const struct condition_list *condition = NULL; |
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if (!argv0) return -EINVAL; |
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*argv0++ = '\0'; |
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cp = FindConditionPart(argv0); |
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if (cp && (condition = FindOrAssignNewCondition(cp)) == NULL) return -EINVAL; |
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kumaneko |
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return AddArgv0Entry(data, argv0, domain, is_delete ? 0 : -1, condition); |
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kumaneko |
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} |
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EXPORT_SYMBOL(CheckArgv0Perm); |
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/***** TOMOYO Linux end. *****/ |