+++ /dev/null
-#include <errno.h>
-#include <libgen.h> /* dirname() */
-#include <limits.h> /* PATH_MAX */
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
-/* ACLs */
-#include <acl/libacl.h> /* acl_get_perm, not portable */
-#include <sys/types.h>
-#include <sys/acl.h>
-
-
-mode_t get_mode(const char* path) {
- /*
- * Get the mode bits from path.
- */
- if (path == NULL) {
- errno = ENOENT;
- return -1;
- }
-
- struct stat s;
- int result = stat(path, &s);
-
- if (result == 0) {
- return s.st_mode;
- }
- else {
- /* errno will be set already by stat() */
- return result;
- }
-}
-
-
-bool is_regular_file(const char* path) {
- /*
- * Returns true if path is a regular file, false otherwise.
- */
- if (path == NULL) {
- return false;
- }
-
- struct stat s;
- int result = stat(path, &s);
- if (result == 0) {
- return S_ISREG(s.st_mode);
- }
- else {
- return false;
- }
-}
-
-bool is_directory(const char* path) {
- /*
- * Returns true if path is a directory, false otherwise.
- */
- if (path == NULL) {
- return false;
- }
-
- struct stat s;
- int result = stat(path, &s);
- if (result == 0) {
- return S_ISDIR(s.st_mode);
- }
- else {
- return false;
- }
-}
-
-
-
-int acl_set_entry(acl_t* aclp,
- acl_entry_t entry) {
- /*
- * Update or create the given entry.
- */
-
- acl_tag_t entry_tag;
- int gt_result = acl_get_tag_type(entry, &entry_tag);
- if (gt_result == -1) {
- perror("acl_set_entry (acl_get_tag_type)");
- return -1;
- }
-
- acl_permset_t entry_permset;
- int ps_result = acl_get_permset(entry, &entry_permset);
- if (ps_result == -1) {
- perror("acl_set_entry (acl_get_permset)");
- return -1;
- }
-
- acl_entry_t existing_entry;
- /* Loop through the given ACL looking for matching entries. */
- int result = acl_get_entry(*aclp, ACL_FIRST_ENTRY, &existing_entry);
-
- while (result == 1) {
- acl_tag_t existing_tag = ACL_UNDEFINED_TAG;
- int tag_result = acl_get_tag_type(existing_entry, &existing_tag);
-
- if (tag_result == -1) {
- perror("set_acl_tag_permset (acl_get_tag_type)");
- return -1;
- }
-
- if (existing_tag == entry_tag) {
- if (entry_tag == ACL_USER_OBJ ||
- entry_tag == ACL_GROUP_OBJ ||
- entry_tag == ACL_OTHER) {
- /* Only update for these three since all other tags will have
- been wiped. */
- acl_permset_t existing_permset;
- int gep_result = acl_get_permset(existing_entry, &existing_permset);
- if (gep_result == -1) {
- perror("acl_set_entry (acl_get_permset)");
- return -1;
- }
-
- int s_result = acl_set_permset(existing_entry, entry_permset);
- if (s_result == -1) {
- perror("acl_set_entry (acl_set_permset)");
- return -1;
- }
-
- return 1;
- }
-
- }
-
- result = acl_get_entry(*aclp, ACL_NEXT_ENTRY, &existing_entry);
- }
-
- /* This catches both the initial acl_get_entry and the ones at the
- end of the loop. */
- if (result == -1) {
- perror("acl_set_entry (acl_get_entry)");
- return -1;
- }
-
- /* If we've made it this far, we need to add a new entry to the
- ACL. */
- acl_entry_t new_entry;
-
- /* We allocate memory here that we should release! */
- int c_result = acl_create_entry(aclp, &new_entry);
- if (c_result == -1) {
- perror("acl_set_entry (acl_create_entry)");
- return -1;
- }
-
- int st_result = acl_set_tag_type(new_entry, entry_tag);
- if (st_result == -1) {
- perror("acl_set_entry (acl_set_tag_type)");
- return -1;
- }
-
- int s_result = acl_set_permset(new_entry, entry_permset);
- if (s_result == -1) {
- perror("acl_set_entry (acl_set_permset)");
- return -1;
- }
-
- if (entry_tag == ACL_USER || entry_tag == ACL_GROUP) {
- /* We need to set the qualifier too. */
- void* entry_qual = acl_get_qualifier(entry);
- if (entry_qual == (void*)NULL) {
- perror("acl_set_entry (acl_get_qualifier)");
- return -1;
- }
-
- int sq_result = acl_set_qualifier(new_entry, entry_qual);
- if (sq_result == -1) {
- perror("acl_set_entry (acl_set_qualifier)");
- return -1;
- }
- }
-
- return 1;
-}
-
-
-
-int acl_entry_count(acl_t* acl) {
- /*
- * Return the number of entries in acl, or -1 on error.
- */
- acl_entry_t entry;
- int entry_count = 0;
- int result = acl_get_entry(*acl, ACL_FIRST_ENTRY, &entry);
-
- while (result == 1) {
- entry_count++;
- result = acl_get_entry(*acl, ACL_NEXT_ENTRY, &entry);
- }
-
- if (result == -1) {
- perror("acl_is_minimal (acl_get_entry)");
- return -1;
- }
-
- return entry_count;
-}
-
-
-int acl_is_minimal(acl_t* acl) {
- /* An ACL is minimal if it has fewer than four entries. Return 0 for
- * false, 1 for true, and -1 on error.
- */
-
- int ec = acl_entry_count(acl);
- if (ec == -1) {
- perror("acl_is_minimal (acl_entry_count)");
- return -1;
- }
-
- if (ec < 4) {
- return 1;
- }
- else {
- return 0;
- }
-}
-
-
-int any_can_execute(const char* path) {
- /* Returns 1 if any ACL entry has execute access, 0 if none do, and
- * -1 on error.
- */
- acl_t acl = acl_get_file(path, ACL_TYPE_ACCESS);
-
- if (acl == (acl_t)NULL) {
- return 0;
- }
-
- /* Our return value. */
- int result = 0;
-
- if (acl_is_minimal(&acl)) {
- mode_t mode = get_mode(path);
- if (mode & (S_IXUSR | S_IXOTH | S_IXGRP)) {
- result = 1;
- goto cleanup;
- }
- else {
- result = 0;
- goto cleanup;
- }
- }
-
- acl_entry_t entry;
- int ge_result = acl_get_entry(acl, ACL_FIRST_ENTRY, &entry);
-
- while (ge_result == 1) {
- acl_permset_t permset;
-
- int ps_result = acl_get_permset(entry, &permset);
- if (ps_result == -1) {
- perror("any_can_execute (acl_get_permset)");
- result = -1;
- goto cleanup;
- }
-
- int gp_result = acl_get_perm(permset, ACL_EXECUTE);
- if (gp_result == -1) {
- perror("any_can_execute (acl_get_perm)");
- result = -1;
- goto cleanup;
- }
-
- if (gp_result == 1) {
- result = 1;
- goto cleanup;
- }
-
- ge_result = acl_get_entry(acl, ACL_NEXT_ENTRY, &entry);
- }
-
- if (ge_result == -1) {
- perror("any_can_execute (acl_get_entry)");
- result = -1;
- goto cleanup;
- }
-
- cleanup:
- acl_free(acl);
- return result;
-}
-
-
-int inherit_default_acl(const char* path, const char* parent) {
- /* Inherit the default ACL from parent to path. This overwrites any
- * existing default ACL. Returns 1 for success, 0 for failure, and
- * -1 on error.
- */
-
- /* Our return value. */
- int result = 1;
-
- if (path == NULL) {
- errno = ENOENT;
- return -1;
- }
-
- if (!is_directory(path) || !is_directory(parent)) {
- return 0;
- }
-
- acl_t parent_acl = acl_get_file(parent, ACL_TYPE_DEFAULT);
- if (parent_acl == (acl_t)NULL) {
- return 0;
- }
-
- acl_t path_acl = acl_dup(parent_acl);
-
- if (path_acl == (acl_t)NULL) {
- perror("inherit_default_acl (acl_dup)");
- acl_free(parent_acl);
- return -1;
- }
-
- int sf_result = acl_set_file(path, ACL_TYPE_DEFAULT, path_acl);
- if (sf_result == -1) {
- perror("inherit_default_acl (acl_set_file)");
- result = -1;
- goto cleanup;
- }
-
- cleanup:
- acl_free(path_acl);
- return result;
-}
-
-
-int wipe_acls(const char* path) {
- /* Remove ACL_USER, ACL_GROUP, and ACL_MASK entries from
- path. Returns 1 for success, 0 for failure, and -1 on error. */
-
- if (path == NULL) {
- errno = ENOENT;
- return -1;
- }
-
- /* Finally, remove individual named/mask entries. */
- acl_t acl = acl_get_file(path, ACL_TYPE_ACCESS);
- if (acl == (acl_t)NULL) {
- perror("wipe_acls (acl_get_file)");
- return -1;
- }
-
- /* Our return value. */
- int result = 1;
-
- acl_entry_t entry;
- int ge_result = acl_get_entry(acl, ACL_FIRST_ENTRY, &entry);
-
- while (ge_result == 1) {
- int d_result = acl_delete_entry(acl, entry);
- if (d_result == -1) {
- perror("wipe_acls (acl_delete_entry)");
- result = -1;
- goto cleanup;
- }
-
- ge_result = acl_get_entry(acl, ACL_NEXT_ENTRY, &entry);
- }
-
- /* Catches the first acl_get_entry as well as the ones at the end of
- the loop. */
- if (ge_result == -1) {
- perror("wipe_acls (acl_get_entry)");
- result = -1;
- goto cleanup;
- }
-
- int sf_result = acl_set_file(path, ACL_TYPE_ACCESS, acl);
- if (sf_result == -1) {
- perror("wipe_acls (acl_set_file)");
- result = -1;
- goto cleanup;
- }
-
- cleanup:
- acl_free(acl);
- return result;
-}
-
-
-int reapply_default_acl(const char* path) {
- /* Really reapply the default ACL by looping through it. Returns one
- * for success, zero for failure (i.e. no ACL), and -1 on unexpected
- * errors.
- */
- if (path == NULL) {
- return 0;
- }
-
- if (!is_regular_file(path) && !is_directory(path)) {
- return 0;
- }
-
- /* dirname mangles its argument */
- char path_copy[PATH_MAX];
- strncpy(path_copy, path, PATH_MAX-1);
- path_copy[PATH_MAX-1] = 0;
-
- char* parent = dirname(path_copy);
- if (!is_directory(parent)) {
- /* Make sure dirname() did what we think it did. */
- return 0;
- }
-
- int ace_result = any_can_execute(path);
- if (ace_result == -1) {
- perror("reapply_default_acl_ng (any_can_execute)");
- return -1;
- }
-
- bool allow_exec = (bool)ace_result;
-
- acl_t defacl = acl_get_file(parent, ACL_TYPE_DEFAULT);
-
- if (defacl == (acl_t)NULL) {
- perror("reapply_default_acl_ng (acl_get_file)");
- return -1;
- }
-
- /* Our return value. */
- int result = 1;
-
- int wipe_result = wipe_acls(path);
- if (wipe_result == -1) {
- perror("reapply_default_acl_ng (wipe_acls)");
- result = -1;
- goto cleanup;
- }
-
- /* Do this after wipe_acls(), otherwise we'll overwrite the wiped
- ACL with this one. */
- acl_t acl = acl_get_file(path, ACL_TYPE_ACCESS);
- if (acl == (acl_t)NULL) {
- perror("reapply_default_acl_ng (acl_get_file)");
- return -1;
- }
-
- /* If it's a directory, inherit the parent's default. */
- int inherit_result = inherit_default_acl(path, parent);
- if (inherit_result == -1) {
- perror("reapply_default_acl_ng (inherit_acls)");
- result = -1;
- goto cleanup;
- }
-
- acl_entry_t entry;
- int ge_result = acl_get_entry(defacl, ACL_FIRST_ENTRY, &entry);
-
- while (ge_result == 1) {
- acl_tag_t tag = ACL_UNDEFINED_TAG;
- int tag_result = acl_get_tag_type(entry, &tag);
-
- if (tag_result == -1) {
- perror("has_default_tag_acl (acl_get_tag_type)");
- result = -1;
- goto cleanup;
- }
-
-
- /* We've got an entry/tag from the default ACL. Get its permset. */
- acl_permset_t permset;
- int ps_result = acl_get_permset(entry, &permset);
- if (ps_result == -1) {
- perror("reapply_default_acl_ng (acl_get_permset)");
- result = -1;
- goto cleanup;
- }
-
- /* If this is a default mask, fix it up. */
- if (tag == ACL_MASK ||
- tag == ACL_USER_OBJ ||
- tag == ACL_GROUP_OBJ ||
- tag == ACL_OTHER) {
- if (!allow_exec) {
- /* The mask doesn't affect acl_user_obj, acl_group_obj (in
- minimal ACLs) or acl_other entries, so if execute should be
- masked, we have to do it manually. */
- int d_result = acl_delete_perm(permset, ACL_EXECUTE);
- if (d_result == -1) {
- perror("reapply_default_acl_ng (acl_delete_perm)");
- result = -1;
- goto cleanup;
- }
-
- int sp_result = acl_set_permset(entry, permset);
- if (sp_result == -1) {
- perror("reapply_default_acl_ng (acl_set_permset)");
- result = -1;
- goto cleanup;
- }
- }
- }
-
- /* Finally, add the permset to the access ACL. */
- int set_result = acl_set_entry(&acl, entry);
- if (set_result == -1) {
- perror("reapply_default_acl_ng (acl_set_entry)");
- result = -1;
- goto cleanup;
- }
-
- ge_result = acl_get_entry(defacl, ACL_NEXT_ENTRY, &entry);
- }
-
- /* Catches the first acl_get_entry as well as the ones at the end of
- the loop. */
- if (ge_result == -1) {
- perror("reapply_default_acl_ng (acl_get_entry)");
- result = -1;
- goto cleanup;
- }
-
- int sf_result = acl_set_file(path, ACL_TYPE_ACCESS, acl);
- if (sf_result == -1) {
- perror("reapply_default_acl_ng (acl_set_file)");
- result = -1;
- goto cleanup;
- }
-
- cleanup:
- acl_free(defacl);
- return result;
-}
-
-
-void usage(char* program_name) {
- /*
- * Print usage information.
- */
- printf("Reapply any applicable default ACLs to the given files or "
- "directories.\n\n");
- printf("Usage: %s <target1> [<target2> [ <target3>...]]\n", program_name);
-}
-
-
-bool asked_for_help(int argc, char* argv[]) {
- /*
- * Check argv for either form of the "help" flag, -h or --help.
- */
- int arg_index = 1;
- for (arg_index = 1; arg_index < argc; arg_index++) {
- if (!strcmp(argv[arg_index], "-h")) {
- return true;
- }
- if (!strcmp(argv[arg_index], "--help")) {
- return true;
- }
- }
-
- return false;
-}
-
-
-int main(int argc, char* argv[]) {
- /*
- * Call reapply_default_acl on each command-line argument.
- */
- if (argc < 2) {
- usage(argv[0]);
- return EXIT_FAILURE;
- }
-
- if (asked_for_help(argc, argv)) {
- usage(argv[0]);
- return EXIT_SUCCESS;
- }
-
- int result = EXIT_SUCCESS;
-
- int arg_index = 1;
- for (arg_index = 1; arg_index < argc; arg_index++) {
- const char* target = argv[arg_index];
- bool reapp_result = reapply_default_acl(target);
-
- if (!reapp_result) {
- result = EXIT_FAILURE;
- }
- }
-
- return result;
-}