diff options
Diffstat (limited to 'lib/util/mkdir_parents.c')
| -rw-r--r-- | lib/util/mkdir_parents.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/lib/util/mkdir_parents.c b/lib/util/mkdir_parents.c new file mode 100644 index 0000000..b483748 --- /dev/null +++ b/lib/util/mkdir_parents.c @@ -0,0 +1,199 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 2009-2022 Todd C. Miller <Todd.Miller@sudo.ws> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* + * This is an open source non-commercial project. Dear PVS-Studio, please check it. + * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com + */ + +#include <config.h> + +#include <sys/stat.h> +#include <stdio.h> +#include <stdlib.h> +#ifdef HAVE_STDBOOL_H +# include <stdbool.h> +#else +# include <compat/stdbool.h> +#endif /* HAVE_STDBOOL_H */ +#include <string.h> +#include <unistd.h> +#include <dirent.h> +#include <errno.h> +#include <fcntl.h> +#include <limits.h> + +#include <sudo_compat.h> +#include <sudo_fatal.h> +#include <sudo_gettext.h> +#include <sudo_debug.h> +#include <sudo_util.h> + +#ifndef O_NOFOLLOW +# define O_NOFOLLOW 0 +#endif + +/* + * Returns true if fd is a directory, else false. + * Warns on failure if not quiet. + */ +static bool +is_dir(int dfd, const char *name, int namelen, bool quiet) +{ + struct stat sb; + debug_decl(is_dir, SUDO_DEBUG_UTIL); + + if (fstat(dfd, &sb) != 0) { + if (!quiet) { + sudo_warn(U_("unable to stat %.*s"), namelen, name); + } + debug_return_bool(false); + } + if (!S_ISDIR(sb.st_mode)) { + if (!quiet) { + sudo_warnx(U_("%.*s exists but is not a directory (0%o)"), + namelen, name, (unsigned int) sb.st_mode); + } + debug_return_bool(false); + } + + debug_return_bool(true); +} + +/* + * Create any parent directories needed by path (but not path itself) + * and return an open fd for the parent directory or -1 on error. + */ +int +sudo_open_parent_dir_v1(const char *path, uid_t uid, gid_t gid, mode_t mode, + bool quiet) +{ + const char *cp, *ep, *pathend; + char name[PATH_MAX]; + int parentfd; + debug_decl(sudo_open_parent_dir, SUDO_DEBUG_UTIL); + + /* Starting parent dir is either root or cwd. */ + cp = path; + if (*cp == '/') { + do { + cp++; + } while (*cp == '/'); + parentfd = open("/", O_RDONLY|O_NONBLOCK); + } else { + parentfd = open(".", O_RDONLY|O_NONBLOCK); + } + if (parentfd == -1) { + if (!quiet) + sudo_warn(U_("unable to open %s"), *path == '/' ? "/" : "."); + debug_return_int(-1); + } + + /* Iterate over path components, skipping the last one. */ + pathend = cp + strlen(cp); + for (cp = sudo_strsplit(cp, pathend, "/", &ep); cp != NULL && ep < pathend; + cp = sudo_strsplit(NULL, pathend, "/", &ep)) { + size_t len = (size_t)(ep - cp); + int dfd; + + sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO, + "mkdir %.*s, mode 0%o, uid %d, gid %d", (int)(ep - path), path, + (unsigned int)mode, (int)uid, (int)gid); + if (len >= sizeof(name)) { + errno = ENAMETOOLONG; + if (!quiet) + sudo_warn(U_("unable to mkdir %.*s"), (int)(ep - path), path); + goto bad; + } + memcpy(name, cp, len); + name[len] = '\0'; +reopen: + dfd = openat(parentfd, name, O_RDONLY|O_NONBLOCK, 0); + if (dfd == -1) { + if (errno != ENOENT) { + if (!quiet) { + sudo_warn(U_("unable to open %.*s"), + (int)(ep - path), path); + } + goto bad; + } + if (mkdirat(parentfd, name, mode) == 0) { + dfd = openat(parentfd, name, O_RDONLY|O_NONBLOCK|O_NOFOLLOW, 0); + if (dfd == -1) { + if (!quiet) { + sudo_warn(U_("unable to open %.*s"), + (int)(ep - path), path); + } + goto bad; + } + /* Make sure the path we created is still a directory. */ + if (!is_dir(dfd, path, (int)(ep - path), quiet)) { + close(dfd); + goto bad; + } + if (uid != (uid_t)-1 && gid != (gid_t)-1) { + if (fchown(dfd, uid, gid) != 0) { + sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO, + "%s: unable to chown %d:%d %.*s", __func__, + (int)uid, (int)gid, (int)(ep - path), path); + } + } + } else { + if (errno == EEXIST) + goto reopen; + if (!quiet) { + sudo_warn(U_("unable to mkdir %.*s"), + (int)(ep - path), path); + } + goto bad; + } + } else { + /* Already exists, make sure it is a directory. */ + if (!is_dir(dfd, path, (int)(ep - path), quiet)) { + close(dfd); + goto bad; + } + } + close(parentfd); + parentfd = dfd; + } + + debug_return_int(parentfd); +bad: + if (parentfd != -1) + close(parentfd); + debug_return_int(-1); +} + +/* + * Create any parent directories needed by path (but not path itself). + * Not currently used. + */ +bool +sudo_mkdir_parents_v1(const char *path, uid_t uid, gid_t gid, mode_t mode, + bool quiet) +{ + int fd; + debug_decl(sudo_mkdir_parents, SUDO_DEBUG_UTIL); + + fd = sudo_open_parent_dir(path, uid, gid, mode, quiet); + if (fd == -1) + debug_return_bool(false); + close(fd); + debug_return_bool(true); +} |