/**
* @file apply-default-acl.c
*
- * @brief The entire implementation.
+ * @brief The command-line interface.
*
*/
#define _XOPEN_SOURCE 500
#define _GNU_SOURCE
-#include <errno.h>
-#include <ftw.h> /* nftw() et al. */
-#include <getopt.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>
+#include <errno.h> /* EINVAL */
+#include <fcntl.h> /* AT_FOO constants */
+#include <ftw.h> /* nftw() et al. */
+#include <getopt.h> /* getopt_long() */
+#include <stdbool.h> /* the "bool" type */
+#include <stdio.h> /* perror() */
+#include <stdlib.h> /* EXIT_FAILURE, EXIT_SUCCESS */
+#include <unistd.h> /* faccessat() */
-/* ACLs */
-#include <acl/libacl.h> /* acl_get_perm, not portable */
-#include <sys/types.h>
-#include <sys/acl.h>
+#include "libadacl.h"
-/* Most of the libacl functions return 1 for success, 0 for failure,
- and -1 on error */
-#define ACL_ERROR -1
-#define ACL_FAILURE 0
-#define ACL_SUCCESS 1
-
-
-/* Command-line options */
-static bool no_exec_mask = false;
+/* We exit with EXIT_FAILURE for small errors, but we need something
+ * else for big ones. */
+#define EXIT_ERROR 2
+#define NFTW_ERROR -1
/**
- * @brief Get the mode bits from the given path.
- *
- * @param path
- * The path (file or directory) whose mode we want.
- *
- * @return A mode_t (st_mode) structure containing the mode bits.
- * See sys/stat.h for details.
- */
-mode_t get_mode(const char* 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;
- }
-}
-
-
-
-/**
- * @brief Determine whether or not the given path is a regular file.
+ * @brief Determine whether or not the given path is accessible.
*
* @param path
* The path to test.
*
- * @return true if @c path is a regular file, false otherwise.
+ * @return true if @c path is accessible to the current effective
+ * user/group, false otherwise.
*/
-bool is_regular_file(const char* path) {
+bool path_accessible(const char* path) {
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;
- }
-}
-
+ /* Test for access using the effective user and group rather than
+ the real one. */
+ int flags = AT_EACCESS;
+ /* Don't follow symlinks when checking for a path's existence,
+ since we won't follow them to set its ACLs either. */
+ flags |= AT_SYMLINK_NOFOLLOW;
-/**
- * @brief Determine whether or not the given path is a directory.
- *
- * @param path
- * The path to test.
- *
- * @return true if @c path is a directory, false otherwise.
- */
-bool is_directory(const char* path) {
- if (path == NULL) {
- return false;
- }
-
- struct stat s;
- int result = stat(path, &s);
- if (result == 0) {
- return S_ISDIR(s.st_mode);
+ /* If the path is relative, interpret it relative to the current
+ working directory (just like the access() system call). */
+ if (faccessat(AT_FDCWD, path, F_OK, flags) == 0) {
+ return true;
}
else {
return false;
}
-
/**
- * @brief Update (or create) an entry in an @b minimal ACL.
- *
- * This function will not work if @c aclp contains extended
- * entries. This is fine for our purposes, since we call @c wipe_acls
- * on each path before applying the default to it.
- *
- * The assumption that there are no extended entries makes things much
- * simpler. For example, we only have to update the @c ACL_USER_OBJ,
- * @c ACL_GROUP_OBJ, and @c ACL_OTHER entries -- all others can simply
- * be created anew. This means we don't have to fool around comparing
- * named-user/group entries.
- *
- * @param aclp
- * A pointer to the acl_t structure whose entry we want to modify.
- *
- * @param entry
- * The new entry. If @c entry contains a user/group/other entry, we
- * update the existing one. Otherwise we create a new entry.
- *
- * @return If there is an unexpected library error, @c ACL_ERROR is
- * returned. Otherwise, @c ACL_SUCCESS.
- *
- */
-int acl_set_entry(acl_t* aclp,
- acl_entry_t entry) {
-
- acl_tag_t entry_tag;
- int gt_result = acl_get_tag_type(entry, &entry_tag);
- if (gt_result == ACL_ERROR) {
- perror("acl_set_entry (acl_get_tag_type)");
- return ACL_ERROR;
- }
-
- acl_permset_t entry_permset;
- int ps_result = acl_get_permset(entry, &entry_permset);
- if (ps_result == ACL_ERROR) {
- perror("acl_set_entry (acl_get_permset)");
- return ACL_ERROR;
- }
-
- 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 == ACL_SUCCESS) {
- acl_tag_t existing_tag = ACL_UNDEFINED_TAG;
- int tag_result = acl_get_tag_type(existing_entry, &existing_tag);
-
- if (tag_result == ACL_ERROR) {
- perror("set_acl_tag_permset (acl_get_tag_type)");
- return ACL_ERROR;
- }
-
- 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. These three are guaranteed to exist, so if we
- match one of them, we're allowed to return ACL_SUCCESS
- below and bypass the rest of the function. */
- acl_permset_t existing_permset;
- int gep_result = acl_get_permset(existing_entry, &existing_permset);
- if (gep_result == ACL_ERROR) {
- perror("acl_set_entry (acl_get_permset)");
- return ACL_ERROR;
- }
-
- int s_result = acl_set_permset(existing_entry, entry_permset);
- if (s_result == ACL_ERROR) {
- perror("acl_set_entry (acl_set_permset)");
- return ACL_ERROR;
- }
-
- return ACL_SUCCESS;
- }
-
- }
-
- 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 == ACL_ERROR) {
- perror("acl_set_entry (acl_get_entry)");
- return ACL_ERROR;
- }
-
- /* 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 == ACL_ERROR) {
- perror("acl_set_entry (acl_create_entry)");
- return ACL_ERROR;
- }
-
- int st_result = acl_set_tag_type(new_entry, entry_tag);
- if (st_result == ACL_ERROR) {
- perror("acl_set_entry (acl_set_tag_type)");
- return ACL_ERROR;
- }
-
- int s_result = acl_set_permset(new_entry, entry_permset);
- if (s_result == ACL_ERROR) {
- perror("acl_set_entry (acl_set_permset)");
- return ACL_ERROR;
- }
-
- 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 ACL_ERROR;
- }
-
- int sq_result = acl_set_qualifier(new_entry, entry_qual);
- if (sq_result == ACL_ERROR) {
- perror("acl_set_entry (acl_set_qualifier)");
- return ACL_ERROR;
- }
- }
-
- return ACL_SUCCESS;
-}
-
-
-
-/**
- * @brief Determine the number of entries in the given ACL.
- *
- * @param acl
- * A pointer to an @c acl_t structure.
- *
- * @return Either the non-negative number of entries in @c acl, or
- * @c ACL_ERROR on error.
- */
-int acl_entry_count(acl_t* acl) {
-
- acl_entry_t entry;
- int entry_count = 0;
- int result = acl_get_entry(*acl, ACL_FIRST_ENTRY, &entry);
-
- while (result == ACL_SUCCESS) {
- entry_count++;
- result = acl_get_entry(*acl, ACL_NEXT_ENTRY, &entry);
- }
-
- if (result == ACL_ERROR) {
- perror("acl_entry_count (acl_get_entry)");
- return ACL_ERROR;
- }
-
- return entry_count;
-}
-
-
-
-/**
- * @brief Determine whether or not the given ACL is minimal.
- *
- * An ACL is minimal if it has fewer than four entries.
- *
- * @param acl
- * A pointer to an acl_t structure.
- *
- * @return
- * - @c ACL_SUCCESS - @c acl is minimal
- * - @c ACL_FAILURE - @c acl is not minimal
- * - @c ACL_ERROR - Unexpected library error
- */
-int acl_is_minimal(acl_t* acl) {
-
- int ec = acl_entry_count(acl);
-
- if (ec == ACL_ERROR) {
- perror("acl_is_minimal (acl_entry_count)");
- return ACL_ERROR;
- }
-
- if (ec < 4) {
- return ACL_SUCCESS;
- }
- else {
- return ACL_FAILURE;
- }
-}
-
-
-
-/**
- * @brief Determine whether the given path has an ACL whose mask
- * denies execute.
- *
- * @param path
- * The path to check.
- *
- * @return
- * - @c ACL_SUCCESS - @c path has a mask which denies execute.
- * - @c ACL_FAILURE - The ACL for @c path does not deny execute,
- * or @c path has no extended ACL at all.
- * - @c ACL_ERROR - Unexpected library error.
- */
-int acl_execute_masked(const char* path) {
-
- acl_t acl = acl_get_file(path, ACL_TYPE_ACCESS);
-
- if (acl == (acl_t)NULL) {
- perror("acl_execute_masked (acl_get_file)");
- return ACL_ERROR;
- }
-
- /* Our return value. */
- int result = ACL_FAILURE;
-
- acl_entry_t entry;
- int ge_result = acl_get_entry(acl, ACL_FIRST_ENTRY, &entry);
-
- while (ge_result == ACL_SUCCESS) {
- acl_tag_t tag = ACL_UNDEFINED_TAG;
- int tag_result = acl_get_tag_type(entry, &tag);
-
- if (tag_result == ACL_ERROR) {
- perror("acl_execute_masked (acl_get_tag_type)");
- result = ACL_ERROR;
- goto cleanup;
- }
-
- if (tag == ACL_MASK) {
- /* This is the mask entry, get its permissions, and see if
- execute is specified. */
- acl_permset_t permset;
-
- int ps_result = acl_get_permset(entry, &permset);
- if (ps_result == ACL_ERROR) {
- perror("acl_execute_masked (acl_get_permset)");
- result = ACL_ERROR;
- goto cleanup;
- }
-
- int gp_result = acl_get_perm(permset, ACL_EXECUTE);
- if (gp_result == ACL_ERROR) {
- perror("acl_execute_masked (acl_get_perm)");
- result = ACL_ERROR;
- goto cleanup;
- }
-
- if (gp_result == ACL_FAILURE) {
- /* No execute bit set in the mask; execute not allowed. */
- return ACL_SUCCESS;
- }
- }
-
- ge_result = acl_get_entry(acl, ACL_NEXT_ENTRY, &entry);
- }
-
- cleanup:
- acl_free(acl);
- return result;
-}
-
-
-/**
- * @brief Determine whether @c path is executable (by anyone) or a
- * directory.
- *
- * This is used as part of the heuristic to determine whether or not
- * we should mask the execute bit when inheriting an ACL. If @c path
- * is a directory, the answer is a clear-cut yes. This behavior is
- * modeled after the capital 'X' perms of setfacl.
- *
- * If @c path is a file, we check the @a effective permissions,
- * contrary to what setfacl does.
+ * @brief Display program usage information.
*
- * @param path
- * The path to check.
+ * @param program_name
+ * The program name to use in the output.
*
- * @return
- * - @c ACL_SUCCESS - @c path is a directory, or someone has effective
- execute permissions.
- * - @c ACL_FAILURE - @c path is a regular file and nobody can execute
- it.
- * - @c ACL_ERROR - Unexpected library error.
*/
-int any_can_execute_or_dir(const char* path) {
-
- if (is_directory(path)) {
- /* That was easy... */
- return ACL_SUCCESS;
- }
-
- acl_t acl = acl_get_file(path, ACL_TYPE_ACCESS);
-
- if (acl == (acl_t)NULL) {
- perror("any_can_execute_or_dir (acl_get_file)");
- return ACL_ERROR;
- }
-
- /* Our return value. */
- int result = ACL_FAILURE;
-
- if (acl_is_minimal(&acl)) {
- mode_t mode = get_mode(path);
- if (mode & (S_IXUSR | S_IXOTH | S_IXGRP)) {
- result = ACL_SUCCESS;
- goto cleanup;
- }
- else {
- result = ACL_FAILURE;
- goto cleanup;
- }
- }
-
- acl_entry_t entry;
- int ge_result = acl_get_entry(acl, ACL_FIRST_ENTRY, &entry);
-
- while (ge_result == ACL_SUCCESS) {
- acl_permset_t permset;
-
- int ps_result = acl_get_permset(entry, &permset);
- if (ps_result == ACL_ERROR) {
- perror("any_can_execute_or_dir (acl_get_permset)");
- result = ACL_ERROR;
- goto cleanup;
- }
-
- int gp_result = acl_get_perm(permset, ACL_EXECUTE);
- if (gp_result == ACL_ERROR) {
- perror("any_can_execute_or_dir (acl_get_perm)");
- result = ACL_ERROR;
- goto cleanup;
- }
-
- if (gp_result == ACL_SUCCESS) {
- /* Only return one if this execute bit is not masked. */
- if (acl_execute_masked(path) != ACL_SUCCESS) {
- result = ACL_SUCCESS;
- goto cleanup;
- }
- }
-
- ge_result = acl_get_entry(acl, ACL_NEXT_ENTRY, &entry);
+void usage(const char* program_name) {
+ if (program_name == NULL) {
+ /* ??? */
+ return;
}
- if (ge_result == ACL_ERROR) {
- perror("any_can_execute_or_dir (acl_get_entry)");
- result = ACL_ERROR;
- goto cleanup;
- }
+ printf("Apply any applicable default ACLs to the given files or "
+ "directories.\n\n");
+ printf("Usage: %s [flags] <target1> [<target2> [ <target3>...]]\n\n",
+ program_name);
+ printf("Flags:\n");
+ printf(" -h, --help Print this help message\n");
+ printf(" -r, --recursive Act on any given directories recursively\n");
+ printf(" -x, --no-exec-mask Apply execute permissions unconditionally\n");
- cleanup:
- acl_free(acl);
- return result;
+ return;
}
-
/**
- * @brief Inherit the default ACL from @c parent to @c path.
- *
- * The @c parent parameter does not necessarily need to be the parent
- * of @c path, although that will usually be the case. This overwrites
- * any existing default ACL on @c path.
+ * @brief Wrapper around @c apply_default_acl() for use with @c nftw().
*
- * @param parent
- * The parent directory whose ACL we want to inherit.
+ * For parameter information, see the @c nftw man page.
*
- * @param path
- * The target directory whose ACL we wish to overwrite (or create).
+ * @return If the ACL was applied to @c target successfully, we return
+ * @c FTW_CONTINUE to signal to @ nftw() that we should proceed onto
+ * the next file or directory. Otherwise, we return @c FTW_STOP to
+ * signal failure.
*
- * @return
- * - @c ACL_SUCCESS - The default ACL was inherited successfully.
- * - @c ACL_FAILURE - Either @c parent or @c path is not a directory.
- * - @c ACL_ERROR - Unexpected library error.
*/
-int inherit_default_acl(const char* path, const char* parent) {
-
- /* Our return value. */
- int result = ACL_SUCCESS;
-
- if (path == NULL) {
- errno = ENOENT;
- return ACL_ERROR;
- }
-
- if (!is_directory(path) || !is_directory(parent)) {
- return ACL_FAILURE;
- }
+int apply_default_acl_nftw(const char *target,
+ const struct stat *sp,
+ int info,
+ struct FTW *ftw) {
- acl_t parent_acl = acl_get_file(parent, ACL_TYPE_DEFAULT);
- if (parent_acl == (acl_t)NULL) {
- perror("inherit_default_acl (acl_get_file)");
+ if (target == NULL) {
+ errno = EINVAL;
+ perror("apply_default_acl_nftw (args)");
return ACL_ERROR;
}
- acl_t path_acl = acl_dup(parent_acl);
- if (path_acl == (acl_t)NULL) {
- perror("inherit_default_acl (acl_dup)");
- acl_free(parent_acl);
+ if (apply_default_acl_ex(target, sp, false) == ACL_ERROR) {
+ /* I guess we do want to bail out for serious/unexpected errors? */
return ACL_ERROR;
}
- int sf_result = acl_set_file(path, ACL_TYPE_DEFAULT, path_acl);
- if (sf_result == -1) {
- perror("inherit_default_acl (acl_set_file)");
- result = ACL_ERROR;
- goto cleanup;
- }
-
- cleanup:
- acl_free(path_acl);
- return result;
+ /* We don't want to kill the tree walk because we it a symlink. */
+ return 0;
}
/**
- * @brief Remove @c ACL_USER, @c ACL_GROUP, and @c ACL_MASK entries
- * from the given path.
+ * @brief Wrapper around @c apply_default_acl() for use with @c nftw().
*
- * @param path
- * The path whose ACLs we want to wipe.
+ * This is identical to @c apply_default_acl_nftw(), except it passes
+ * @c true to @c apply_default_acl() as its no_exec_mask argument.
*
- * @return
- * - @c ACL_SUCCESS - The ACLs were wiped successfully, or none
- * existed in the first place.
- * - @c ACL_ERROR - Unexpected library error.
*/
-int wipe_acls(const char* path) {
-
- if (path == NULL) {
- errno = ENOENT;
+int apply_default_acl_nftw_x(const char *target,
+ const struct stat *sp,
+ int info,
+ struct FTW *ftw) {
+
+ if (target == NULL) {
+ errno = EINVAL;
+ perror("apply_default_acl_nftw_x (args)");
return ACL_ERROR;
}
- acl_t acl = acl_get_file(path, ACL_TYPE_ACCESS);
- if (acl == (acl_t)NULL) {
- perror("wipe_acls (acl_get_file)");
+ if (apply_default_acl_ex(target, sp, true) == ACL_ERROR) {
+ /* I guess we do want to bail out for serious/unexpected errors? */
return ACL_ERROR;
}
- /* Our return value. */
- int result = ACL_SUCCESS;
-
- acl_entry_t entry;
- int ge_result = acl_get_entry(acl, ACL_FIRST_ENTRY, &entry);
-
- while (ge_result == ACL_SUCCESS) {
- int d_result = acl_delete_entry(acl, entry);
- if (d_result == ACL_ERROR) {
- perror("wipe_acls (acl_delete_entry)");
- result = ACL_ERROR;
- 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 == ACL_ERROR) {
- perror("wipe_acls (acl_get_entry)");
- result = ACL_ERROR;
- goto cleanup;
- }
-
- int sf_result = acl_set_file(path, ACL_TYPE_ACCESS, acl);
- if (sf_result == ACL_ERROR) {
- perror("wipe_acls (acl_set_file)");
- result = ACL_ERROR;
- goto cleanup;
- }
-
- cleanup:
- acl_free(acl);
- return result;
-}
-
-
-
-/**
- * @brief Apply parent default ACL to a path.
- *
- * This overwrites any existing ACLs on @c path.
- *
- * @param path
- * The path whose ACL we would like to reset to its default.
- *
- * @return
- * - @c ACL_SUCCESS - The parent default ACL was inherited successfully.
- * - @c ACL_FAILURE - The target path is not a regular file/directory,
- * or the parent of @c path is not a directory.
- * - @c ACL_ERROR - Unexpected library error.
- */
-int apply_default_acl(const char* path) {
-
- if (path == NULL) {
- errno = ENOENT;
- return ACL_ERROR;
- }
-
- if (!is_regular_file(path) && !is_directory(path)) {
- return ACL_FAILURE;
- }
-
- /* 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 ACL_FAILURE;
- }
-
- /* Default to not masking the exec bit; i.e. applying the default
- ACL literally. If --no-exec-mask was not specified, then we try
- to "guess" whether or not to mask the exec bit. */
- bool allow_exec = true;
-
- if (!no_exec_mask) {
- int ace_result = any_can_execute_or_dir(path);
-
- if (ace_result == ACL_ERROR) {
- perror("apply_default_acl (any_can_execute_or_dir)");
- return ACL_ERROR;
- }
-
- allow_exec = (bool)ace_result;
- }
-
- acl_t defacl = acl_get_file(parent, ACL_TYPE_DEFAULT);
-
- if (defacl == (acl_t)NULL) {
- perror("apply_default_acl (acl_get_file)");
- return ACL_ERROR;
- }
-
- /* Our return value. */
- int result = ACL_SUCCESS;
-
- int wipe_result = wipe_acls(path);
- if (wipe_result == ACL_ERROR) {
- perror("apply_default_acl (wipe_acls)");
- result = ACL_ERROR;
- 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("apply_default_acl (acl_get_file)");
- return ACL_ERROR;
- }
-
- /* If it's a directory, inherit the parent's default. */
- int inherit_result = inherit_default_acl(path, parent);
- if (inherit_result == ACL_ERROR) {
- perror("apply_default_acl (inherit_acls)");
- result = ACL_ERROR;
- goto cleanup;
- }
-
- acl_entry_t entry;
- int ge_result = acl_get_entry(defacl, ACL_FIRST_ENTRY, &entry);
-
- while (ge_result == ACL_SUCCESS) {
- acl_tag_t tag = ACL_UNDEFINED_TAG;
- int tag_result = acl_get_tag_type(entry, &tag);
-
- if (tag_result == ACL_ERROR) {
- perror("apply_default_acl (acl_get_tag_type)");
- result = ACL_ERROR;
- 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 == ACL_ERROR) {
- perror("apply_default_acl (acl_get_permset)");
- result = ACL_ERROR;
- 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 == ACL_ERROR) {
- perror("apply_default_acl (acl_delete_perm)");
- result = ACL_ERROR;
- goto cleanup;
- }
-
- int sp_result = acl_set_permset(entry, permset);
- if (sp_result == ACL_ERROR) {
- perror("apply_default_acl (acl_set_permset)");
- result = ACL_ERROR;
- goto cleanup;
- }
- }
- }
-
- /* Finally, add the permset to the access ACL. */
- int set_result = acl_set_entry(&acl, entry);
- if (set_result == ACL_ERROR) {
- perror("apply_default_acl (acl_set_entry)");
- result = ACL_ERROR;
- 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 == ACL_ERROR) {
- perror("apply_default_acl (acl_get_entry)");
- result = ACL_ERROR;
- goto cleanup;
- }
-
- int sf_result = acl_set_file(path, ACL_TYPE_ACCESS, acl);
- if (sf_result == ACL_ERROR) {
- perror("apply_default_acl (acl_set_file)");
- result = ACL_ERROR;
- goto cleanup;
- }
-
- cleanup:
- acl_free(defacl);
- return result;
-}
-
-
-
-/**
- * @brief Display program usage information.
- *
- * @param program_name
- * The program name to use in the output.
- *
- */
-void usage(char* program_name) {
- printf("Apply any applicable default ACLs to the given files or "
- "directories.\n\n");
- printf("Usage: %s [flags] <target1> [<target2> [ <target3>...]]\n\n",
- program_name);
- printf("Flags:\n");
- printf(" -h, --help Print this help message\n");
- printf(" -r, --recursive Act on any given directories recursively\n");
- printf(" -x, --no-exec-mask Apply execute permissions unconditionally\n");
-
- return;
-}
-
-
-/**
- * @brief Wrapper around @c apply_default_acl() for use with @c nftw().
- *
- * For parameter information, see the @c nftw man page.
- *
- * @return If the ACL was applied to @c target successfully, we return
- * @c FTW_CONTINUE to signal to @ nftw() that we should proceed onto
- * the next file or directory. Otherwise, we return @c FTW_STOP to
- * signal failure.
- *
- */
-int apply_default_acl_nftw(const char *target,
- const struct stat *s,
- int info,
- struct FTW *ftw) {
-
- bool app_result = apply_default_acl(target);
- if (app_result) {
- return FTW_CONTINUE;
- }
- else {
- return FTW_STOP;
- }
+ /* We don't want to kill the tree walk because we it a symlink. */
+ return 0;
}
* apply_default_acl() recursively on all of its children. Otherwise,
* we just delegate to @c apply_default_acl().
*
- * We ignore symlinks for consistency with chmod -r.
+ * @param target
+ * The root (path) of the recursive application.
+ *
+ * @param no_exec_mask
+ * The value (either true or false) of the --no-exec-mask flag.
*
* @return
- * If @c target is not a directory, we return the result of
- * calling @c apply_default_acl() on @c target. Otherwise, we convert
- * the return value of @c nftw(). If @c nftw() succeeds (returns 0),
- * then we return @c true. Otherwise, we return @c false.
- * \n\n
- * If there is an error, it will be reported via @c perror, but
- * we still return @c false.
+ * If @c nftw() fails with a serious error (returns NFTW_ERROR),
+ * then we return @c ACL_ERROR. Otherwise, we return @c ACL_SUCCESS.
*/
-bool apply_default_acl_recursive(const char *target) {
-
- if (!is_directory(target)) {
- return apply_default_acl(target);
+int apply_default_acl_recursive(const char *target, bool no_exec_mask) {
+ if (target == NULL) {
+ errno = EINVAL;
+ perror("apply_default_acl_recursive (args)");
+ return ACL_ERROR;
}
int max_levels = 256;
- int flags = FTW_PHYS; /* Don't follow links. */
-
- int nftw_result = nftw(target,
- apply_default_acl_nftw,
- max_levels,
- flags);
-
- if (nftw_result == 0) {
- /* Success */
- return true;
- }
-
- /* nftw will return -1 on error, or if the supplied function
- * (apply_default_acl_nftw) returns a non-zero result, nftw will
- * return that.
- */
- if (nftw_result == -1) {
+ int flags = FTW_MOUNT | FTW_PHYS;
+
+ /* There are two separate functions that could be passed to
+ nftw(). One passes no_exec_mask = true to apply_default_acl(),
+ and the other passes no_exec_mask = false. Since the function we
+ pass to nftw() cannot have parameters, we have to create separate
+ options and make the decision here. */
+ int (*fn)(const char *, const struct stat *, int, struct FTW *) = NULL;
+ fn = no_exec_mask ? apply_default_acl_nftw_x : apply_default_acl_nftw;
+
+ int nftw_result = nftw(target, fn, max_levels, flags);
+
+ /* nftw will itself return NFTW_ERROR on errors like malloc failure,
+ and since the only non-success value that "fn" can return us
+ ACL_ERROR == NFTW_ERROR, this covers all error cases. */
+ if (nftw_result == NFTW_ERROR) {
perror("apply_default_acl_recursive (nftw)");
+ return ACL_ERROR;
}
- return false;
+ /* Beware: nftw indicates success with 0, but ACL_SUCCESS != 0. */
+ return ACL_SUCCESS;
}
}
bool recursive = false;
- /* bool no_exec_mask is declared static/global */
+ bool no_exec_mask = false;
struct option long_options[] = {
/* These options set a flag. */
int arg_index = 1;
for (arg_index = optind; arg_index < argc; arg_index++) {
const char* target = argv[arg_index];
- bool reapp_result = false;
- if (recursive) {
- reapp_result = apply_default_acl_recursive(target);
- }
- else {
- /* It's either normal file, or we're not operating recursively. */
- reapp_result = apply_default_acl(target);
+ /* Make sure we can access the given path before we go out of our
+ * way to please it. Doing this check outside of
+ * apply_default_acl() lets us spit out a better error message for
+ * typos, too.
+ */
+ if (!path_accessible(target)) {
+ perror(target);
+ result = EXIT_FAILURE;
+ continue;
}
- if (!reapp_result) {
+ int (*f)(const char *, bool) = recursive ? apply_default_acl_recursive
+ : apply_default_acl;
+ int reapp_result = f(target, no_exec_mask);
+
+ if (result == EXIT_SUCCESS && reapp_result == ACL_FAILURE) {
+ /* We don't want to turn an error into a (less-severe) failure. */
result = EXIT_FAILURE;
}
+ if (reapp_result == ACL_ERROR) {
+ /* Turn both success and failure into an error, if we encounter one. */
+ result = EXIT_ERROR;
+ }
}
return result;
projects / apply-default-acl.git / blobdiff