File: aa_status.c

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apparmor 2.13.6-10
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/*
 *   Copyright (C) 2020 Canonical Ltd.
 *
 *   This program is free software; you can redistribute it and/or
 *    modify it under the terms of version 2 of the GNU General Public
 *   License published by the Free Software Foundation.
 */

#define _GNU_SOURCE /* for asprintf() */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <regex.h>
#include <errno.h>
#include <ctype.h>
#include <dirent.h>

#include <sys/apparmor.h>
#include <sys/apparmor_private.h>

#define autofree __attribute((cleanup(_aa_autofree)))
#define autofclose __attribute((cleanup(_aa_autofclose)))

#define AA_EXIT_ENABLED 0
#define AA_EXIT_DISABLED 1
#define AA_EXIT_NO_POLICY 2
#define AA_EXIT_NO_CONTROL 3
#define AA_EXIT_NO_PERM 4
#define AA_EXIT_INTERNAL_ERROR 42

#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))

struct profile {
        char *name;
        char *status;
};

static void free_profiles(struct profile *profiles, size_t n) {
        while (n > 0) {
                n--;
                free(profiles[n].name);
                free(profiles[n].status);
        }
        free(profiles);
}

struct process {
        char *pid;
        char *profile;
        char *exe;
        char *mode;
};

static void free_processes(struct process *processes, size_t n) {
        while (n > 0) {
                n--;
                free(processes[n].pid);
                free(processes[n].profile);
                free(processes[n].exe);
                free(processes[n].mode);
        }
        free(processes);
}

static int verbose = 0;

#define dprintf(...)                                                           \
  do {                                                                         \
    if (verbose)                                                               \
      printf(__VA_ARGS__);                                                     \
  } while (0)

#define dfprintf(...)                                                          \
  do {                                                                         \
    if (verbose)                                                               \
      fprintf(__VA_ARGS__);                                                    \
  } while (0)


static int get_profiles(struct profile **profiles, size_t *n) {
        autofree char *apparmorfs = NULL;
        autofree char *apparmor_profiles = NULL;
        struct stat st;
        autofclose FILE *fp = NULL;
        regex_t regex;
        autofree char *line = NULL;
        size_t len = 0;
        int ret;

        *profiles = NULL;
        *n = 0;

        ret = stat("/sys/module/apparmor", &st);
        if (ret != 0) {
                dfprintf(stderr, "apparmor not present.\n");
                ret = AA_EXIT_DISABLED;
                goto exit;
        }
        dprintf("apparmor module is loaded.\n");

        ret = aa_find_mountpoint(&apparmorfs);
        if (ret == -1) {
                dfprintf(stderr, "apparmor filesystem is not mounted.\n");
                ret = AA_EXIT_NO_CONTROL;
                goto exit;
        }

        apparmor_profiles = malloc(strlen(apparmorfs) + 10); // /profiles\0
        if (apparmor_profiles == NULL) {
                ret = AA_EXIT_INTERNAL_ERROR;
                goto exit;
        }
        sprintf(apparmor_profiles, "%s/profiles", apparmorfs);

        fp = fopen(apparmor_profiles, "r");
        if (fp == NULL) {
                if (errno == EACCES) {
                        dfprintf(stderr, "You do not have enough privilege to read the profile set.\n");
                } else {
                        dfprintf(stderr, "Could not open %s: %s", apparmor_profiles, strerror(errno));
                }
                ret = AA_EXIT_NO_PERM;
                goto exit;
        }

        ret = regcomp(&regex, "^(.+)\\s+\\((.+)\\).*", REG_EXTENDED | REG_NEWLINE);
        if (ret != 0) {
                ret = AA_EXIT_INTERNAL_ERROR;
                goto exit;
        }

        while (getline(&line, &len, fp) != -1) {
                regmatch_t match[3];

                ret = regexec(&regex, line, 3, match, 0);
                if (ret == 0) {
                        size_t i;
                        struct profile *_profiles;
                        autofree char *name = strndup(line + match[1].rm_so,
                                             match[1].rm_eo - match[1].rm_so);
                        autofree char *status = strndup(line + match[2].rm_so,
                                               match[2].rm_eo - match[2].rm_so);

                        // give up if out of memory
                        if (name == NULL || status == NULL) {
                                free_profiles(*profiles, *n);
                                *profiles = NULL;
                                *n = 0;
                                ret = AA_EXIT_INTERNAL_ERROR;
                                break;
                        }
                        _profiles = realloc(*profiles, (*n + 1) * sizeof(**profiles));
                        if (_profiles == NULL) {
                                free_profiles(*profiles, *n);
                                *profiles = NULL;
                                *n = 0;
                                ret = AA_EXIT_INTERNAL_ERROR;
                                break;
                        }
                        // steal name and status
                        _profiles[*n].name = name;
                        _profiles[*n].status = status;
                        name = NULL;
                        status = NULL;
                        *n = *n + 1;
                        *profiles = _profiles;
                }
        }
        regfree(&regex);

exit:
        return ret == 0 ? (*n > 0 ? AA_EXIT_ENABLED : AA_EXIT_NO_POLICY) : ret;
}

static int compare_profiles(const void *a, const void *b) {
        return strcmp(((struct profile *)a)->name,
                      ((struct profile *)b)->name);
}

static int filter_profiles(struct profile *profiles,
                           size_t n,
                           const char *filter,
                           struct profile **filtered,
                           size_t *nfiltered)
{
        int ret = 0;
        size_t i;

        *filtered = NULL;
        *nfiltered = 0;

        for (i = 0; i < n; i++) {
                if (filter == NULL || strcmp(profiles[i].status, filter) == 0) {
                        struct profile *_filtered = realloc(*filtered, (*nfiltered + 1) * sizeof(**filtered));
                        if (_filtered == NULL) {
                                free_profiles(*filtered, *nfiltered);
                                *filtered = NULL;
                                *nfiltered = 0;
                                ret = AA_EXIT_INTERNAL_ERROR;
                                break;
                        }
                        _filtered[*nfiltered].name = strdup(profiles[i].name);
                        _filtered[*nfiltered].status = strdup(profiles[i].status);
                        *filtered = _filtered;
                        *nfiltered = *nfiltered + 1;
                }
        }
        if (*nfiltered != 0) {
                qsort(*filtered, *nfiltered, sizeof(*profiles), compare_profiles);
        }
        return ret;
}

static int get_processes(struct profile *profiles,
                         size_t n,
                         struct process **processes,
                         size_t *nprocesses)
{
        DIR *dir = NULL;
        struct dirent *entry = NULL;
        regex_t regex;
        int ret;

        *processes = NULL;
        *nprocesses = 0;

        ret = regcomp(&regex, "^(.*)\\s+\\((.*)\\)\n$", REG_EXTENDED | REG_NEWLINE);
        if (ret != 0) {
                ret = AA_EXIT_INTERNAL_ERROR;
                goto exit;
        }
        dir = opendir("/proc");
        if (dir == NULL) {
                ret = AA_EXIT_INTERNAL_ERROR;
                goto free_regex;
        }
        while ((entry = readdir(dir)) != NULL) {
                int i;
                int ispid = 1;
                autofree char *current = NULL;
                autofree char *exe = NULL;
                autofree char *real_exe = NULL;
                autofclose FILE *fp = NULL;
                autofree char *line = NULL;
                size_t len = 0;

                // ignore non-pid entries
                for (i = 0; ispid && i < strlen(entry->d_name); i++) {
                        ispid = (isdigit(entry->d_name[i]) ? 1 : 0);
                }
                if (!ispid) {
                        continue;
                }
                if (asprintf(&current, "/proc/%s/attr/current", entry->d_name) == -1 ||
                    asprintf(&exe, "/proc/%s/exe", entry->d_name) == -1) {
                        fprintf(stderr, "ERROR: Failed to allocate memory\n");
                        ret = AA_EXIT_INTERNAL_ERROR;
                        goto free_regex;
                }
                // get executable - readpath can allocate for us but seems
                // to fail in some cases with errno 2 - no such file or
                // directory - whereas readlink() can succeed in these
                // cases - and readpath() seems to have the same behaviour
                // as in python with better canonicalized results so try it
                // first and fallack to readlink if it fails
                // coverity[toctou]
                real_exe = realpath(exe, NULL);
                if (real_exe == NULL) {
                        int res;
                        // ensure enough space for NUL terminator
                        real_exe = calloc(PATH_MAX + 1, sizeof(char));
                        if (real_exe == NULL) {
                                fprintf(stderr, "ERROR: Failed to allocate memory\n");
                                ret = AA_EXIT_INTERNAL_ERROR;
                                goto free_regex;
                        }
                        res = readlink(exe, real_exe, PATH_MAX);
                        if (res == -1) {
                                continue;
                        }
                        real_exe[res] = '\0';
                }
                // see if has a label
                fp = fopen(current, "r");
                if (fp == NULL) {
                        continue;
                }
                while (getline(&line, &len, fp) != -1) {
                        autofree char *profile = NULL;
                        autofree char *mode = NULL;
                        regmatch_t match[3];
                        int res;

                        res = regexec(&regex, line, 3, match, 0);
                        if (res == 0) {
                                profile = strndup(line + match[1].rm_so,
                                                  match[1].rm_eo - match[1].rm_so);
                                mode = strndup(line + match[2].rm_so,
                                               match[2].rm_eo - match[2].rm_so);
                        } else {
                                // is unconfined so keep only if this has a
                                // matching profile
                                for (i = 0; i < n; i++) {
                                        if (strcmp(profiles[i].name, real_exe) == 0) {
                                                profile = strdup(real_exe);
                                                mode = strdup("unconfined");
                                                break;
                                        }
                                }
                        }
                        if (profile != NULL && mode != NULL) {
                                struct process *_processes = realloc(*processes,
                                                                     (*nprocesses + 1) * sizeof(**processes));
                                if (_processes == NULL) {
                                        free_processes(*processes, *nprocesses);
                                        *processes = NULL;
                                        *nprocesses = 0;
                                        ret = AA_EXIT_INTERNAL_ERROR;
                                        goto free_regex;
                                }
                                _processes[*nprocesses].pid = strdup(entry->d_name);
                                _processes[*nprocesses].profile = profile;
                                _processes[*nprocesses].exe = strdup(real_exe);
                                _processes[*nprocesses].mode = mode;
                                *processes = _processes;
                                *nprocesses = *nprocesses + 1;
                                profile = NULL;
                                mode = NULL;
                                ret = AA_EXIT_ENABLED;
                        }
                }
        }

free_regex:
        regfree(&regex);
exit:
        if (dir != NULL) {
                closedir(dir);
        }
        return ret;
}

static int filter_processes(struct process *processes,
                            size_t n,
                            const char *filter,
                            struct process **filtered,
                            size_t *nfiltered)
{
        size_t i;
        int ret = 0;

        *filtered = NULL;
        *nfiltered = 0;

        for (i = 0; i < n; i++) {
                if (filter == NULL || strcmp(processes[i].mode, filter) == 0) {
                        struct process *_filtered = realloc(*filtered, (*nfiltered + 1) * sizeof(**filtered));
                        if (_filtered == NULL) {
                                free_processes(*filtered, *nfiltered);
                                *filtered = NULL;
                                *nfiltered = 0;
                                ret = AA_EXIT_INTERNAL_ERROR;
                                break;
                        }
                        _filtered[*nfiltered].pid = strdup(processes[i].pid);
                        _filtered[*nfiltered].profile = strdup(processes[i].profile);
                        _filtered[*nfiltered].exe = strdup(processes[i].exe);
                        _filtered[*nfiltered].mode = strdup(processes[i].mode);
                        *filtered = _filtered;
                        *nfiltered = *nfiltered + 1;
                }
        }
        return ret;
}

/**
 * Returns error code if AppArmor is not enabled
 */
static int simple_filtered_count(const char *filter) {
        size_t n;
        struct profile *profiles;
        int ret;

        ret = get_profiles(&profiles, &n);
        if (ret == 0) {
                size_t nfiltered;
                struct profile *filtered = NULL;
                ret = filter_profiles(profiles, n, filter, &filtered, &nfiltered);
                printf("%zd\n", nfiltered);
                free_profiles(filtered, nfiltered);
        }
        free_profiles(profiles, n);
        return ret;
}

static int cmd_enabled(const char *command) {
        int res = aa_is_enabled();
        return res == 1 ? 0 : 1;
}


static int cmd_profiled(const char *command) {
        return simple_filtered_count(NULL);
}

static int cmd_enforced(const char *command) {
        return simple_filtered_count("enforce");
}

static int cmd_complaining(const char *command) {
        return simple_filtered_count("complain");
}

static int compare_processes_by_profile(const void *a, const void *b) {
        return strcmp(((struct process *)a)->profile,
                      ((struct process *)b)->profile);
}

static int compare_processes_by_executable(const void *a, const void *b) {
        return strcmp(((struct process *)a)->exe,
                      ((struct process *)b)->exe);
}

static int detailed_output(int json) {
        size_t nprofiles = 0, nprocesses = 0;
        struct profile *profiles = NULL;
        struct process *processes = NULL;
        const char *profile_statuses[] = {"enforce", "complain"};
        const char *process_statuses[] = {"enforce", "complain", "unconfined"};
        int ret, i;

        ret = get_profiles(&profiles, &nprofiles);
        if (ret != 0) {
                goto exit;
        }
        ret = get_processes(profiles, nprofiles, &processes, &nprocesses);
        if (ret != 0) {
                dfprintf(stderr, "Failed to get processes: %d....\n", ret);
                goto exit;
        }

        if (json) {
                printf("{\"version\": \"1\", \"profiles\": {");
        } else {
                dprintf("%zd profiles are loaded.\n", nprofiles);
        }

        for (i = 0; i < ARRAY_SIZE(profile_statuses); i++) {
                size_t nfiltered = 0, j;
                struct profile *filtered = NULL;
                ret = filter_profiles(profiles, nprofiles, profile_statuses[i], &filtered, &nfiltered);
                if (ret != 0) {
                        goto exit;
                }
                if (!json) {
                        dprintf("%zd profiles are in %s mode.\n", nfiltered, profile_statuses[i]);
                }

                for (j = 0; j < nfiltered; j++) {
                        if (json) {
                                printf("%s\"%s\": \"%s\"",
                                       i == 0 && j == 0 ? "" : ", ", filtered[j].name, profile_statuses[i]);
                        } else {
                                dprintf("   %s\n", filtered[j].name);
                        }
                }

                free_profiles(filtered, nfiltered);
        }
        if (json) {
                printf("}, \"processes\": {");
        } else {
                dprintf("%zd processes have profiles defined.\n", nprocesses);
        }

        for (i = 0; i < ARRAY_SIZE(process_statuses); i++) {
                size_t nfiltered = 0, j;
                struct process *filtered = NULL;
                ret = filter_processes(processes, nprocesses, process_statuses[i], &filtered, &nfiltered);
                if (ret != 0) {
                        goto exit;
                }
                if (!json) {
                        if (strcmp(process_statuses[i], "unconfined") == 0) {
                                dprintf("%zd processes are unconfined but have a profile defined.\n", nfiltered);
                        } else {
                                dprintf("%zd processes are in %s mode.\n", nfiltered, process_statuses[i]);
                        }
                }

                if (!json) {
                        qsort(filtered, nfiltered, sizeof(*filtered), compare_processes_by_profile);
                        for (j = 0; j < nfiltered; j++) {
                                dprintf("   %s (%s) %s\n", filtered[j].exe, filtered[j].pid,
                                        // hide profile name if matches executable
                                        (strcmp(filtered[j].profile, filtered[j].exe) == 0 ?
                                         "" :
                                         filtered[j].profile));
                        }
                } else {
                        // json output requires processes to be grouped per executable
                        qsort(filtered, nfiltered, sizeof(*filtered), compare_processes_by_executable);
                        for (j = 0; j < nfiltered; j++) {
                                if (j > 0 && strcmp(filtered[j].exe, filtered[j - 1].exe) == 0) {
                                        // same executable
                                        printf(", {\"profile\": \"%s\", \"pid\": \"%s\", \"status\": \"%s\"}",
                                               filtered[j].profile, filtered[j].pid, filtered[j].mode);
                                } else {
                                        printf("%s\"%s\": [{\"profile\": \"%s\", \"pid\": \"%s\", \"status\": \"%s\"}",
                                               // first element will be a unique executable
                                               i == 0 && j == 0 ? "" : "], ",
                                               filtered[j].exe, filtered[j].profile, filtered[j].pid, filtered[j].mode);
                                }

                        }
                }
                free_processes(filtered, nfiltered);
        }
        if (json) {
                printf("%s}}", nprocesses > 0 ? "]" : "");
        }

exit:
        free_processes(processes, nprocesses);
        free_profiles(profiles, nprofiles);
        return ret == 0 ? (nprofiles > 0 ? AA_EXIT_ENABLED : AA_EXIT_NO_POLICY) : ret;
}

static int cmd_json(const char *command) {
        detailed_output(1);
        return 0;
}

static int cmd_pretty_json(const char *command) {
        // TODO - add support for pretty printing json output
        return cmd_json(command);
}

static int cmd_verbose(const char *command) {
        verbose = 1;
        return detailed_output(0);
}

static int print_usage(const char *command)
{
  printf("Usage: %s [OPTIONS]\n"
         "Displays various information about the currently loaded AppArmor policy.\n"
         "OPTIONS (one only):\n"
         "  --enabled       returns error code if AppArmor not enabled\n"
         "  --profiled      prints the number of loaded policies\n"
         "  --enforced      prints the number of loaded enforcing policies\n"
         "  --complaining   prints the number of loaded non-enforcing policies\n"
         "  --json          displays multiple data points in machine-readable JSON format\n"
         "  --pretty-json   same data as --json, formatted for human consumption as well\n"
         "  --verbose       (default) displays multiple data points about loaded policy set\n"
         "  --help          this message\n",
         command);
  return 0;
}

struct command {
        const char * const name;
        int (*cmd)(const char *command);
};

static struct command commands[] = {
        {"--enabled", cmd_enabled},
        {"--profiled", cmd_profiled},
        {"--enforced", cmd_enforced},
        {"--complaining", cmd_complaining},
        {"--json", cmd_json},
        {"--pretty-json", cmd_pretty_json},
        {"--verbose", cmd_verbose},
        {"-v", cmd_verbose},
        {"--help", print_usage},
        {"-h", print_usage},
};

int main(int argc, char **argv)
{
        int ret = EXIT_SUCCESS;
        int _ret;
        int (*cmd)(const char*) = cmd_verbose;

        if (argc > 2) {
                dfprintf(stderr, "Error: Too many options.\n");
                cmd = print_usage;
                ret = EXIT_FAILURE;
        } else if (argc == 2) {
                int (*_cmd)(const char*) = NULL;
                int i;
                for (i = 0; i < ARRAY_SIZE(commands); i++) {
                        if (strcmp(argv[1], commands[i].name) == 0) {
                                _cmd = commands[i].cmd;
                                break;
                        }
                }
                if (_cmd == NULL) {
                        dfprintf(stderr, "Error: Invalid command.\n");
                        cmd = print_usage;
                        ret = EXIT_FAILURE;
                } else {
                        cmd = _cmd;
                }
        }

        _ret = cmd(argv[0]);
        exit(ret == EXIT_FAILURE ? ret : _ret);
}