/* * returns: -3 deprecated, -2 success - no reply, -1 error - noreply, * 0 success - reply, > 0 success - rule */ static int setopt(int count, int lineno, char *vars[]) { int c; int retval = 0, rc; optind = 0; opterr = 0; key[0] = 0; keylen = AUDIT_MAX_KEY_LEN; while ((retval >= 0) && (c = getopt(count, vars, "hicslDvtC:e:f:r:b:a:A:d:S:F:m:R:w:W:k:p:q:")) != EOF) { int flags = AUDIT_FILTER_UNSET; rc = 10; // Init to something impossible to see if unused. switch (c) { case 'h': usage(); retval = -1; break; case 'i': ignore = 1; retval = -2; break; case 'c': ignore = 1; continue_error = 1; retval = -2; break; case 's': retval = audit_request_status(fd); if (retval <= 0) retval = -1; else retval = 0; /* success - just get the reply */ break; case 'e': if (optarg && ((strcmp(optarg, "0") == 0) || (strcmp(optarg, "1") == 0) || (strcmp(optarg, "2") == 0))) { if (audit_set_enabled(fd, strtoul(optarg,NULL,0)) > 0) audit_request_status(fd); else retval = -1; } else { fprintf(stderr, "Enable must be 0, 1, or 2 was %s\n", optarg); retval = -1; } break; case 'f': if (optarg && ((strcmp(optarg, "0") == 0) || (strcmp(optarg, "1") == 0) || (strcmp(optarg, "2") == 0))) { if (audit_set_failure(fd, strtoul(optarg,NULL,0)) > 0) audit_request_status(fd); else return -1; } else { fprintf(stderr, "Failure must be 0, 1, or 2 was %s\n", optarg); retval = -1; } break; case 'r': if (optarg && isdigit(optarg[0])) { uint32_t rate; errno = 0; rate = strtoul(optarg,NULL,0); if (errno) { fprintf(stderr, "Error converting rate\n"); return -1; } if (audit_set_rate_limit(fd, rate) > 0) audit_request_status(fd); else return -1; } else { fprintf(stderr, "Rate must be a numeric value was %s\n", optarg); retval = -1; } break; case 'b': if (optarg && isdigit(optarg[0])) { uint32_t limit; errno = 0; limit = strtoul(optarg,NULL,0); if (errno) { fprintf(stderr, "Error converting backlog\n"); return -1; } if (audit_set_backlog_limit(fd, limit) > 0) audit_request_status(fd); else return -1; } else { fprintf(stderr, "Backlog must be a numeric value was %s\n", optarg); retval = -1; } break; case 'l': if (count > 4 || count == 3) { fprintf(stderr, "Wrong number of options for list request\n"); retval = -1; break; } if (count == 4) { if (strcmp(vars[optind], "-k") == 0) { strncat(key, vars[3], keylen); count -= 2; } else { fprintf(stderr, "Only the -k option is allowed\n"); retval = -1; break; } } if (audit_request_rule_list(fd)) retval = -2; else retval = -1; break; case 'a': if (strstr(optarg, "task") && _audit_syscalladded) { fprintf(stderr, "Syscall auditing requested for task list\n"); retval = -1; } else { rc = audit_rule_setup(optarg, &add, &action, lineno); if (rc == 3) { fprintf(stderr, "Multiple rule insert/delete operations are not allowed\n"); retval = -1; } else if (rc == 2) { fprintf(stderr, "Append rule - bad keyword %s\n", optarg); retval = -1; } else if (rc == 1) { fprintf(stderr, "Append rule - possible is deprecated\n"); return -3; /* deprecated - eat it */ } else retval = 1; /* success - please send */ } break; case 'A': if (strstr(optarg, "task") && _audit_syscalladded) { fprintf(stderr, "Error: syscall auditing requested for task list\n"); retval = -1; } else { rc = audit_rule_setup(optarg, &add, &action, lineno); if (rc == 3) { fprintf(stderr, "Multiple rule insert/delete operations are not allowed\n"); retval = -1; } else if (rc == 2) { fprintf(stderr, "Add rule - bad keyword %s\n", optarg); retval = -1; } else if (rc == 1) { fprintf(stderr, "Append rule - possible is deprecated\n"); return -3; /* deprecated - eat it */ } else { add |= AUDIT_FILTER_PREPEND; retval = 1; /* success - please send */ } } break; case 'd': rc = audit_rule_setup(optarg, &del, &action, lineno); if (rc == 3) { fprintf(stderr, "Multiple rule insert/delete operations are not allowed\n"); retval = -1; } else if (rc == 2) { fprintf(stderr, "Delete rule - bad keyword %s\n", optarg); retval = -1; } else if (rc == 1) { fprintf(stderr, "Delete rule - possible is deprecated\n"); return -3; /* deprecated - eat it */ } else retval = 1; /* success - please send */ break; case 'S': { int unknown_arch = !_audit_elf; /* Do some checking to make sure that we are not adding a * syscall rule to a list that does not make sense. */ if (((add & (AUDIT_FILTER_MASK|AUDIT_FILTER_UNSET)) == AUDIT_FILTER_TASK || (del & (AUDIT_FILTER_MASK|AUDIT_FILTER_UNSET)) == AUDIT_FILTER_TASK)) { fprintf(stderr, "Error: syscall auditing being added to task list\n"); return -1; } else if (((add & (AUDIT_FILTER_MASK|AUDIT_FILTER_UNSET)) == AUDIT_FILTER_USER || (del & (AUDIT_FILTER_MASK|AUDIT_FILTER_UNSET)) == AUDIT_FILTER_USER)) { fprintf(stderr, "Error: syscall auditing being added to user list\n"); return -1; } else if (exclude) { fprintf(stderr, "Error: syscall auditing cannot be put on exclude list\n"); return -1; } else { if (unknown_arch) { int machine; unsigned int elf; machine = audit_detect_machine(); if (machine < 0) { fprintf(stderr, "Error detecting machine type\n"); return -1; } elf = audit_machine_to_elf(machine); if (elf == 0) { fprintf(stderr, "Error looking up elf type\n"); return -1; } _audit_elf = elf; } } rc = audit_rule_syscallbyname_data(rule_new, optarg); switch (rc) { case 0: _audit_syscalladded = 1; if (unknown_arch && add != AUDIT_FILTER_UNSET) check_rule_mismatch(lineno, optarg); break; case -1: fprintf(stderr, "Syscall name unknown: %s\n", optarg); retval = -1; break; case -2: fprintf(stderr, "Elf type unknown: 0x%x\n", _audit_elf); retval = -1; break; }} break; case 'F': if (add != AUDIT_FILTER_UNSET) flags = add & AUDIT_FILTER_MASK; else if (del != AUDIT_FILTER_UNSET) flags = del & AUDIT_FILTER_MASK; // if the field is arch & there is a -t option...we // can allow it else if ((optind >= count) || (strstr(optarg, "arch=") == NULL) || (strcmp(vars[optind], "-t") != 0)) { fprintf(stderr, "List must be given before field\n"); retval = -1; break; } rc = audit_rule_fieldpair_data(&rule_new,optarg,flags); if (rc != 0) { audit_number_to_errmsg(rc, optarg); retval = -1; } else { if (rule_new->fields[rule_new->field_count-1] == AUDIT_PERM) _audit_permadded = 1; } break; case 'C': if (add != AUDIT_FILTER_UNSET) flags = add & AUDIT_FILTER_MASK; else if (del != AUDIT_FILTER_UNSET) flags = del & AUDIT_FILTER_MASK; rc = audit_rule_interfield_comp_data(&rule_new, optarg, flags); if (rc != 0) { audit_number_to_errmsg(rc, optarg); retval = -1; } else { if (rule_new->fields[rule_new->field_count - 1] == AUDIT_PERM) _audit_permadded = 1; } break; case 'm': if (count > 3) { fprintf(stderr, "The -m option must be only the only option and takes 1 parameter\n"); retval = -1; } else if (audit_log_user_message( fd, AUDIT_USER, optarg, NULL, NULL, NULL, 1) <= 0) retval = -1; else return -2; // success - no reply for this break; case 'R': fprintf(stderr, "Error - nested rule files not supported\n"); retval = -1; break; case 'D': if (count > 4 || count == 3) { fprintf(stderr, "Wrong number of options for Delete all request\n"); retval = -1; break; } if (count == 4) { if (strcmp(vars[optind], "-k") == 0) { strncat(key, vars[3], keylen); count -= 2; } else { fprintf(stderr, "Only the -k option is allowed\n"); retval = -1; break; } } retval = delete_all_rules(fd); if (retval == 0) { (void)audit_request_rule_list(fd); key[0] = 0; retval = -2; } break; case 'w': if (add != AUDIT_FILTER_UNSET || del != AUDIT_FILTER_UNSET) { fprintf(stderr, "watch option can't be given with a syscall\n"); retval = -1; } else if (optarg) { add = AUDIT_FILTER_EXIT; action = AUDIT_ALWAYS; _audit_syscalladded = 1; retval = audit_setup_watch_name(&rule_new, optarg); } else { fprintf(stderr, "watch option needs a path\n"); retval = -1; } break; case 'W': if (optarg) { del = AUDIT_FILTER_EXIT; action = AUDIT_ALWAYS; _audit_syscalladded = 1; retval = audit_setup_watch_name(&rule_new, optarg); } else { fprintf(stderr, "watch option needs a path\n"); retval = -1; } break; case 'k': if (!(_audit_syscalladded || _audit_permadded ) || (add==AUDIT_FILTER_UNSET && del==AUDIT_FILTER_UNSET)) { fprintf(stderr, "key option needs a watch or syscall given prior to it\n"); retval = -1; } else if (!optarg) { fprintf(stderr, "key option needs a value\n"); retval = -1; } else if ((strlen(optarg)+strlen(key)+(!!key[0])) > AUDIT_MAX_KEY_LEN) { fprintf(stderr, "key option exceeds size limit\n"); retval = -1; } else { if (strncmp(optarg, "ids-", 4) == 0) { if (check_ids_key(optarg)) { retval = -1; break; } } if (strchr(optarg, AUDIT_KEY_SEPARATOR)) fprintf(stderr, "key %s has illegal character\n", optarg); if (key[0]) { // Add the separator if we need to strcat(key, key_sep); keylen--; } strncat(key, optarg, keylen); keylen = AUDIT_MAX_KEY_LEN - strlen(key); } break; case 'p': if (!add && !del) { fprintf(stderr, "permission option needs a watch given prior to it\n"); retval = -1; } else if (!optarg) { fprintf(stderr, "permission option needs a filter\n"); retval = -1; } else retval = audit_setup_perms(rule_new, optarg); break; case 'q': if (_audit_syscalladded) { fprintf(stderr, "Syscall auditing requested for make equivalent\n"); retval = -1; } else { char *mp, *sub; retval = equiv_parse(optarg, &mp, &sub); if (retval < 0) { fprintf(stderr, "Error parsing equivalent parts\n"); retval = -1; } else { retval = audit_make_equivalent(fd, mp, sub); if (retval <= 0) { retval = -1; } else return -2; // success - no reply needed } } break; case 't': retval = audit_trim_subtrees(fd); if (retval <= 0) retval = -1; else return -2; // success - no reply for this break; case 'v': printf("auditctl version %s\n", VERSION); retval = -2; break; default: usage(); retval = -1; break; } } /* catch extra args or errors where the user types "- s" */ if (optind == 1) retval = -1; else if ((optind < count) && (retval != -1)) { fprintf(stderr, "parameter passed without an option given\n"); retval = -1; } /* See if we were adding a key */ if (key[0] && list_requested == 0) { int flags = 0; char *cmd=NULL; /* Get the flag */ if (add != AUDIT_FILTER_UNSET) flags = add & AUDIT_FILTER_MASK; else if (del != AUDIT_FILTER_UNSET) flags = del & AUDIT_FILTER_MASK; /* Build the command */ asprintf(&cmd, "key=%s", key); if (cmd) { /* Add this to the rule */ int ret = audit_rule_fieldpair_data(&rule_new, cmd, flags); if (ret < 0) retval = -1; free(cmd); } else { fprintf(stderr, "Out of memory adding key\n"); retval = -1; } } if (retval == -1 && errno == ECONNREFUSED) fprintf(stderr, "The audit system is disabled\n"); return retval; }
/* * Algorithm: * check that user is root * check to see if program exists * if so fork, child waits for parent * parent clears audit rules, loads audit all syscalls with child's pid * parent tells child to go & waits for sigchld * child exec's program * parent deletes rules after getting sigchld */ int main(int argc, char *argv[]) { int fd[2]; int pid,cmd=1; char buf[2]; if (argc < 2) { usage(); return 1; } if (strcmp(argv[cmd], "-h") == 0) { usage(); return 1; } if (strcmp(argv[cmd], "-r") == 0) { threat = 1; cmd++; } if (getuid() != 0) { fprintf(stderr, "You must be root to run this program.\n"); return 1; } if (access(argv[cmd], X_OK)) { if (errno == ENOENT) fprintf(stderr, "Error - can't find: %s\n", argv[cmd]); else fprintf(stderr, "Error checking %s (%s)\n", argv[cmd], strerror(errno)); return 1; } set_aumessage_mode(MSG_STDERR, DBG_NO); switch (count_rules()) { case -1: if (errno == ECONNREFUSED) fprintf(stderr, "The audit system is disabled\n"); else fprintf(stderr, "Error - can't get rule count.\n"); return 1; case 0: break; default: fprintf(stderr, "autrace cannot be run with rules loaded.\n" "Please delete all rules using 'auditctl -D' if you " "really wanted to\nrun this command.\n"); return 1; } if (pipe(fd) != 0) { fprintf(stderr, "Error creating pipe.\n"); return 1; } switch ((pid=fork())) { case -1: fprintf(stderr, "Error forking.\n"); return 1; case 0: /* Child */ close(fd[1]); printf("Waiting to execute: %s\n", argv[cmd]); while (read(fd[0], buf, 1) == -1 && errno == EINTR) /* blank */ ; close(fd[0]); execvp(argv[cmd], &argv[cmd]); fprintf(stderr, "Failed to exec %s\n", argv[cmd]); return 1; default: /* Parent */ close(fd[0]); fcntl(fd[1], F_SETFD, FD_CLOEXEC); { char field[16]; int audit_fd; audit_fd = audit_open(); if (audit_fd < 0) exit(1); snprintf(field, sizeof(field), "pid=%d", pid); if (insert_rule(audit_fd, field)) { kill(pid,SIGTERM); (void)delete_all_rules(audit_fd); exit(1); } snprintf(field, sizeof(field), "ppid=%d", pid); if (insert_rule(audit_fd, field)) { kill(pid,SIGTERM); (void)delete_all_rules(audit_fd); exit(1); } sleep(1); if (write(fd[1],"1", 1) != 1) { kill(pid,SIGTERM); (void)delete_all_rules(audit_fd); exit(1); } waitpid(pid, NULL, 0); close(fd[1]); puts("Cleaning up..."); (void)delete_all_rules(audit_fd); close(audit_fd); } printf("Trace complete. " "You can locate the records with " "\'ausearch -i -p %d\'\n", pid); break; } return 0; }