15263807472

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <unistd.h>

#include "alloc-util.h"
#include "btrfs.h"
#include "chase.h"
#include "errno-util.h"
#include "fd-util.h"
#include "format-util.h"
#include "fs-util.h"
#include "log.h"
#include "mkdir.h"
#include "path-util.h"
#include "stat-util.h"
#include "string-util.h"
#include "time-util.h"
#include "user-util.h"

int mkdirat_safe_internal(
                int dir_fd,
                const char *path,
                mode_t mode,
                uid_t uid,
                gid_t gid,
                MkdirFlags flags,
                mkdirat_func_t _mkdirat) {

        struct stat st;
        int r;

        assert(path);
        assert(mode != MODE_INVALID);
        assert(_mkdirat && _mkdirat != mkdirat);

        r = _mkdirat(dir_fd, path, mode);
        if (r >= 0)
                return chmod_and_chown_at(dir_fd, path, mode, uid, gid);
        if (r != -EEXIST)
                return r;

        if (fstatat(dir_fd, path, &st, AT_SYMLINK_NOFOLLOW) < 0)
                return -errno;

        if ((flags & MKDIR_FOLLOW_SYMLINK) && S_ISLNK(st.st_mode)) {
                _cleanup_free_ char *p = NULL;

                r = chaseat(dir_fd, path, CHASE_NONEXISTENT, &p, NULL);
                if (r < 0)
                        return r;
                if (r == 0)
                        return mkdirat_safe_internal(dir_fd, p, mode, uid, gid,
                                                     flags & ~MKDIR_FOLLOW_SYMLINK,
                                                     _mkdirat);

                if (fstatat(dir_fd, p, &st, AT_SYMLINK_NOFOLLOW) < 0)
                        return -errno;
        }

        if (flags & MKDIR_IGNORE_EXISTING)
                return 0;

        if (!S_ISDIR(st.st_mode))
                return log_full_errno(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG, SYNTHETIC_ERRNO(ENOTDIR),
                                      "Path \"%s\" already exists and is not a directory, refusing.", path);

        if ((st.st_mode & ~mode & 0777) != 0)
                return log_full_errno(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG, SYNTHETIC_ERRNO(EEXIST),
                                      "Directory \"%s\" already exists, but has mode %04o that is too permissive (%04o was requested), refusing.",
                                      path, st.st_mode & 0777, mode);

        if ((uid != UID_INVALID && st.st_uid != uid) ||
            (gid != GID_INVALID && st.st_gid != gid))
                return log_full_errno(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG, SYNTHETIC_ERRNO(EEXIST),
                                      "Directory \"%s\" already exists, but is owned by "UID_FMT":"GID_FMT" (%s:%s was requested), refusing.",
                                      path, st.st_uid, st.st_gid, uid != UID_INVALID ? FORMAT_UID(uid) : "-",
                                      gid != UID_INVALID ? FORMAT_GID(gid) : "-");

        return 0;
}

int mkdirat_errno_wrapper(int dirfd, const char *pathname, mode_t mode) {
        return RET_NERRNO(mkdirat(dirfd, pathname, mode));
}

int mkdirat_safe(int dir_fd, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags) {
        return mkdirat_safe_internal(dir_fd, path, mode, uid, gid, flags, mkdirat_errno_wrapper);
}

int mkdirat_parents_internal(int dir_fd, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags, mkdirat_func_t _mkdirat) {
        const char *e = NULL;
        int r;

        assert(path);
        assert(_mkdirat != mkdirat);

        if (isempty(path))
                return 0;

        if (!path_is_safe(path))
                return -ENOTDIR;

        /* return immediately if directory exists */
        r = path_find_last_component(path, /* accept_dot_dot= */ false, &e, NULL);
        if (r <= 0) /* r == 0 means path is equivalent to prefix. */
                return r;
        if (e == path)
                return 0;

        assert(e > path);
        assert(*e == '/');

        /* drop the last component */
        path = strndupa_safe(path, e - path);
        r = is_dir_at(dir_fd, path, /* follow = */ true);
        if (r > 0)
                return 0;
        if (r == 0)
                return -ENOTDIR;

        /* create every parent directory in the path, except the last component */
        for (const char *p = path;;) {
                char *s;
                int n;

                n = path_find_first_component(&p, /* accept_dot_dot= */ false, (const char **) &s);
                if (n <= 0)
                        return n;

                assert(p);
                assert(s >= path);
                assert(IN_SET(s[n], '/', '\0'));

                s[n] = '\0';

                r = mkdirat_safe_internal(dir_fd, path, mode, uid, gid, flags | MKDIR_IGNORE_EXISTING, _mkdirat);
                if (r < 0 && r != -EEXIST)
                        return r;

                s[n] = *p == '\0' ? '\0' : '/';
        }
}

int mkdir_parents_internal(const char *prefix, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags, mkdirat_func_t _mkdirat) {
        _cleanup_close_ int fd = AT_FDCWD;
        const char *p;

        assert(path);
        assert(_mkdirat != mkdirat);

        if (prefix) {
                p = path_startswith_full(path, prefix, PATH_STARTSWITH_REFUSE_DOT_DOT);
                if (!p)
                        return -EINVAL;

                fd = open(prefix, O_PATH|O_DIRECTORY|O_CLOEXEC);
                if (fd < 0)
                        return -errno;
        } else
                p = path;

        return mkdirat_parents_internal(fd, p, mode, uid, gid, flags, _mkdirat);
}

int mkdirat_parents(int dir_fd, const char *path, mode_t mode) {
        return mkdirat_parents_internal(dir_fd, path, mode, UID_INVALID, UID_INVALID, 0, mkdirat_errno_wrapper);
}

int mkdir_parents_safe(const char *prefix, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags) {
        return mkdir_parents_internal(prefix, path, mode, uid, gid, flags, mkdirat_errno_wrapper);
}

int mkdir_p_internal(const char *prefix, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags, mkdirat_func_t _mkdirat) {
        int r;

        /* Like mkdir -p */

        assert(_mkdirat != mkdirat);

        r = mkdir_parents_internal(prefix, path, mode, uid, gid, flags | MKDIR_FOLLOW_SYMLINK, _mkdirat);
        if (r < 0)
                return r;

        if (!uid_is_valid(uid) && !gid_is_valid(gid) && flags == 0) {
                r = _mkdirat(AT_FDCWD, path, mode);
                if (r < 0 && (r != -EEXIST || is_dir(path, true) <= 0))
                        return r;
        } else {
                r = mkdir_safe_internal(path, mode, uid, gid, flags, _mkdirat);
                if (r < 0 && r != -EEXIST)
                        return r;
        }

        return 0;
}

int mkdir_p(const char *path, mode_t mode) {
        return mkdir_p_internal(NULL, path, mode, UID_INVALID, UID_INVALID, 0, mkdirat_errno_wrapper);
}

int mkdir_p_safe(const char *prefix, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags) {
        return mkdir_p_internal(prefix, path, mode, uid, gid, flags, mkdirat_errno_wrapper);
}

int mkdir_p_root_full(const char *root, const char *p, uid_t uid, gid_t gid, mode_t m, usec_t ts, char **subvolumes) {
        _cleanup_free_ char *pp = NULL, *bn = NULL;
        _cleanup_close_ int dfd = -EBADF;
        int r;

        assert(p);

        r = path_extract_directory(p, &pp);
        if (r == -EDESTADDRREQ) {
                /* only fname is passed, no prefix to operate on */
                dfd = open(".", O_RDONLY|O_CLOEXEC|O_DIRECTORY);
                if (dfd < 0)
                        return -errno;
        } else if (r == -EADDRNOTAVAIL)
                /* only root dir or "." was passed, i.e. there is no parent to extract, in that case there's nothing to do. */
                return 0;
        else if (r < 0)
                return r;
        else {
                /* Extracting the parent dir worked, hence we aren't top-level? Recurse up first. */
                r = mkdir_p_root_full(root, pp, uid, gid, m, ts, subvolumes);
                if (r < 0)
                        return r;

                dfd = chase_and_open(pp, root, CHASE_PREFIX_ROOT, O_CLOEXEC|O_DIRECTORY, NULL);
                if (dfd < 0)
                        return dfd;
        }

        r = path_extract_filename(p, &bn);
        if (r == -EADDRNOTAVAIL) /* Already top-level */
                return 0;
        if (r < 0)
                return r;

        if (path_strv_contains(subvolumes, p))
                r = btrfs_subvol_make_fallback(dfd, bn, m);
        else
                r = RET_NERRNO(mkdirat(dfd, bn, m));
        if (r == -EEXIST)
                return 0;
        if (r < 0)
                return r;

        if (ts == USEC_INFINITY && !uid_is_valid(uid) && !gid_is_valid(gid))
                return 1;

        _cleanup_close_ int nfd = openat(dfd, bn, O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
        if (nfd < 0)
                return -errno;

        if (ts != USEC_INFINITY) {
                struct timespec tspec;
                timespec_store(&tspec, ts);

                if (futimens(dfd, (const struct timespec[2]) { TIMESPEC_OMIT, tspec }) < 0)
                        return -errno;

                if (futimens(nfd, (const struct timespec[2]) { tspec, tspec }) < 0)
                        return -errno;
        }

        if ((uid_is_valid(uid) || gid_is_valid(gid)) && fchown(nfd, uid, gid) < 0)
                return -errno;

        return 1;
}

1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3	#include <unistd.h>
4
5	#include "alloc-util.h"
6	#include "btrfs.h"
7	#include "chase.h"
8	#include "errno-util.h"
9	#include "fd-util.h"
10	#include "format-util.h"
11	#include "fs-util.h"
12	#include "log.h"
13	#include "mkdir.h"
14	#include "path-util.h"
15	#include "stat-util.h"
16	#include "string-util.h"
17	#include "time-util.h"
18	#include "user-util.h"
19
20	int mkdirat_safe_internal(	32,037✔
21	int dir_fd,
22	const char *path,
23	mode_t mode,
24	uid_t uid,
25	gid_t gid,
26	MkdirFlags flags,
27	mkdirat_func_t _mkdirat) {
28
29	struct stat st;	32,037✔
30	int r;	32,037✔
31
32	assert(path);	32,037✔
33	assert(mode != MODE_INVALID);	32,037✔
34	assert(_mkdirat && _mkdirat != mkdirat);	32,037✔
35
36	r = _mkdirat(dir_fd, path, mode);	32,037✔
37	if (r >= 0)	32,037✔
38	return chmod_and_chown_at(dir_fd, path, mode, uid, gid);	32,037✔
39	if (r != -EEXIST)	24,113✔
40	return r;
41
42	if (fstatat(dir_fd, path, &st, AT_SYMLINK_NOFOLLOW) < 0)	24,111✔
UNCOV 43	return -errno;	×
44
45	if ((flags & MKDIR_FOLLOW_SYMLINK) && S_ISLNK(st.st_mode)) {	24,111✔
46	_cleanup_free_ char *p = NULL;	3✔
47
48	r = chaseat(dir_fd, path, CHASE_NONEXISTENT, &p, NULL);	3✔
49	if (r < 0)	3✔
50	return r;
51	if (r == 0)	3✔
52	return mkdirat_safe_internal(dir_fd, p, mode, uid, gid,	1✔
53	flags & ~MKDIR_FOLLOW_SYMLINK,	1✔
54	_mkdirat);
55
56	if (fstatat(dir_fd, p, &st, AT_SYMLINK_NOFOLLOW) < 0)	2✔
UNCOV 57	return -errno;	×
58	}
59
60	if (flags & MKDIR_IGNORE_EXISTING)	24,110✔
61	return 0;
62
63	if (!S_ISDIR(st.st_mode))	5,575✔
64	return log_full_errno(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG, SYNTHETIC_ERRNO(ENOTDIR),	1✔
65	"Path \"%s\" already exists and is not a directory, refusing.", path);
66
67	if ((st.st_mode & ~mode & 0777) != 0)	5,574✔
68	return log_full_errno(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG, SYNTHETIC_ERRNO(EEXIST),	90✔
69	"Directory \"%s\" already exists, but has mode %04o that is too permissive (%04o was requested), refusing.",
70	path, st.st_mode & 0777, mode);
71
72	if ((uid != UID_INVALID && st.st_uid != uid) \|\|	5,484✔
73	(gid != GID_INVALID && st.st_gid != gid))	4,734✔
74	return log_full_errno(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG, SYNTHETIC_ERRNO(EEXIST),	3✔
75	"Directory \"%s\" already exists, but is owned by "UID_FMT":"GID_FMT" (%s:%s was requested), refusing.",
76	path, st.st_uid, st.st_gid, uid != UID_INVALID ? FORMAT_UID(uid) : "-",
77	gid != UID_INVALID ? FORMAT_GID(gid) : "-");
78
79	return 0;
80	}
81
82	int mkdirat_errno_wrapper(int dirfd, const char *pathname, mode_t mode) {	497,345✔
83	return RET_NERRNO(mkdirat(dirfd, pathname, mode));	497,345✔
84	}
85
86	int mkdirat_safe(int dir_fd, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags) {	21✔
87	return mkdirat_safe_internal(dir_fd, path, mode, uid, gid, flags, mkdirat_errno_wrapper);	21✔
88	}
89
90	int mkdirat_parents_internal(int dir_fd, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags, mkdirat_func_t _mkdirat) {	842,634✔
91	const char *e = NULL;	842,634✔
92	int r;	842,634✔
93
94	assert(path);	842,634✔
95	assert(_mkdirat != mkdirat);	842,634✔
96
97	if (isempty(path))	842,634✔
98	return 0;	842,634✔
99
100	if (!path_is_safe(path))	842,634✔
101	return -ENOTDIR;
102
103	/* return immediately if directory exists */
104	r = path_find_last_component(path, /* accept_dot_dot= */ false, &e, NULL);	842,634✔
105	if (r <= 0) /* r == 0 means path is equivalent to prefix. */	842,634✔
106	return r;
107	if (e == path)	842,631✔
108	return 0;
109
110	assert(e > path);	840,813✔
111	assert(*e == '/');	840,813✔
112
113	/* drop the last component */
114	path = strndupa_safe(path, e - path);	840,813✔
115	r = is_dir_at(dir_fd, path, /* follow = */ true);	840,813✔
116	if (r > 0)	840,813✔
117	return 0;
118	if (r == 0)	6,184✔
119	return -ENOTDIR;
120
121	/* create every parent directory in the path, except the last component */
122	for (const char *p = path;;) {	6,184✔
123	char *s;	32,322✔
124	int n;	32,322✔
125
126	n = path_find_first_component(&p, /* accept_dot_dot= / false, (const char *) &s);	32,322✔
127	if (n <= 0)	32,322✔
128	return n;	6,184✔
129
130	assert(p);	26,140✔
131	assert(s >= path);	26,140✔
132	assert(IN_SET(s[n], '/', '\0'));	26,140✔
133
134	s[n] = '\0';	26,140✔
135
136	r = mkdirat_safe_internal(dir_fd, path, mode, uid, gid, flags \| MKDIR_IGNORE_EXISTING, _mkdirat);	26,140✔
137	if (r < 0 && r != -EEXIST)	26,140✔
138	return r;
139
140	s[n] = *p == '\0' ? '\0' : '/';	46,094✔
141	}
142	}
143
144	int mkdir_parents_internal(const char prefix, const char path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags, mkdirat_func_t _mkdirat) {	498,320✔
145	_cleanup_close_ int fd = AT_FDCWD;	498,320✔
146	const char *p;	498,320✔
147
148	assert(path);	498,320✔
149	assert(_mkdirat != mkdirat);	498,320✔
150
151	if (prefix) {	498,320✔
152	p = path_startswith_full(path, prefix, PATH_STARTSWITH_REFUSE_DOT_DOT);	1,636✔
153	if (!p)	1,636✔
154	return -EINVAL;
155
156	fd = open(prefix, O_PATH\|O_DIRECTORY\|O_CLOEXEC);	1,635✔
157	if (fd < 0)	1,635✔
158	return -errno;	2✔
159	} else
160	p = path;
161
162	return mkdirat_parents_internal(fd, p, mode, uid, gid, flags, _mkdirat);	498,317✔
163	}
164
165	int mkdirat_parents(int dir_fd, const char *path, mode_t mode) {	166,751✔
166	return mkdirat_parents_internal(dir_fd, path, mode, UID_INVALID, UID_INVALID, 0, mkdirat_errno_wrapper);	166,751✔
167	}
168
169	int mkdir_parents_safe(const char prefix, const char path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags) {	223✔
170	return mkdir_parents_internal(prefix, path, mode, uid, gid, flags, mkdirat_errno_wrapper);	223✔
171	}
172
173	int mkdir_p_internal(const char prefix, const char path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags, mkdirat_func_t _mkdirat) {	498,003✔
174	int r;	498,003✔
175
176	/* Like mkdir -p */
177
178	assert(_mkdirat != mkdirat);	498,003✔
179
180	r = mkdir_parents_internal(prefix, path, mode, uid, gid, flags \| MKDIR_FOLLOW_SYMLINK, _mkdirat);	498,003✔
181	if (r < 0)	498,003✔
182	return r;
183
184	if (!uid_is_valid(uid) && !gid_is_valid(gid) && flags == 0) {	995,420✔
185	r = _mkdirat(AT_FDCWD, path, mode);	497,420✔
186	if (r < 0 && (r != -EEXIST \|\| is_dir(path, true) <= 0))	497,420✔
187	return r;	1✔
188	} else {
189	r = mkdir_safe_internal(path, mode, uid, gid, flags, _mkdirat);	580✔
190	if (r < 0 && r != -EEXIST)	580✔
UNCOV 191	return r;	×
192	}
193
194	return 0;
195	}
196
197	int mkdir_p(const char *path, mode_t mode) {	488,407✔
198	return mkdir_p_internal(NULL, path, mode, UID_INVALID, UID_INVALID, 0, mkdirat_errno_wrapper);	488,407✔
199	}
200
201	int mkdir_p_safe(const char prefix, const char path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags) {	1,532✔
202	return mkdir_p_internal(prefix, path, mode, uid, gid, flags, mkdirat_errno_wrapper);	1,532✔
203	}
204
205	int mkdir_p_root_full(const char root, const char p, uid_t uid, gid_t gid, mode_t m, usec_t ts, char **subvolumes) {	255✔
206	_cleanup_free_ char pp = NULL, bn = NULL;	255✔
207	_cleanup_close_ int dfd = -EBADF;	255✔
208	int r;	255✔
209
210	assert(p);	255✔
211
212	r = path_extract_directory(p, &pp);	255✔
213	if (r == -EDESTADDRREQ) {	255✔
214	/* only fname is passed, no prefix to operate on */
UNCOV 215	dfd = open(".", O_RDONLY\|O_CLOEXEC\|O_DIRECTORY);	×
UNCOV 216	if (dfd < 0)	×
217	return -errno;	×
218	} else if (r == -EADDRNOTAVAIL)	255✔
219	/* only root dir or "." was passed, i.e. there is no parent to extract, in that case there's nothing to do. */
220	return 0;
221	else if (r < 0)	138✔
222	return r;
223	else {
224	/* Extracting the parent dir worked, hence we aren't top-level? Recurse up first. */
225	r = mkdir_p_root_full(root, pp, uid, gid, m, ts, subvolumes);	138✔
226	if (r < 0)	138✔
227	return r;
228
229	dfd = chase_and_open(pp, root, CHASE_PREFIX_ROOT, O_CLOEXEC\|O_DIRECTORY, NULL);	138✔
230	if (dfd < 0)	138✔
231	return dfd;
232	}
233
234	r = path_extract_filename(p, &bn);	136✔
235	if (r == -EADDRNOTAVAIL) /* Already top-level */	136✔
236	return 0;
237	if (r < 0)	136✔
238	return r;
239
240	if (path_strv_contains(subvolumes, p))	136✔
UNCOV 241	r = btrfs_subvol_make_fallback(dfd, bn, m);	×
242	else
243	r = RET_NERRNO(mkdirat(dfd, bn, m));	136✔
244	if (r == -EEXIST)	72✔
245	return 0;
246	if (r < 0)	64✔
247	return r;
248
249	if (ts == USEC_INFINITY && !uid_is_valid(uid) && !gid_is_valid(gid))	125✔
250	return 1;
251
252	_cleanup_close_ int nfd = openat(dfd, bn, O_CLOEXEC\|O_DIRECTORY\|O_NOFOLLOW);	258✔
253	if (nfd < 0)	3✔
UNCOV 254	return -errno;	×
255
256	if (ts != USEC_INFINITY) {	3✔
257	struct timespec tspec;	3✔
258	timespec_store(&tspec, ts);	3✔
259
260	if (futimens(dfd, (const struct timespec[2]) { TIMESPEC_OMIT, tspec }) < 0)	3✔
UNCOV 261	return -errno;	×
262
263	if (futimens(nfd, (const struct timespec[2]) { tspec, tspec }) < 0)	3✔
UNCOV 264	return -errno;	×
265	}
266
267	if ((uid_is_valid(uid) \|\| gid_is_valid(gid)) && fchown(nfd, uid, gid) < 0)	6✔
UNCOV 268	return -errno;	×
269
270	return 1;
271	}

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