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70a5db58 LP |
1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2 | ||
3 | #include "dirent-util.h" | |
4 | #include "fd-util.h" | |
5 | #include "fileio.h" | |
6 | #include "format-util.h" | |
7 | #include "fs-util.h" | |
8 | #include "homework-cifs.h" | |
9 | #include "homework-mount.h" | |
10 | #include "mount-util.h" | |
11 | #include "process-util.h" | |
12 | #include "strv.h" | |
13 | #include "tmpfile-util.h" | |
14 | ||
15 | int home_prepare_cifs( | |
16 | UserRecord *h, | |
17 | bool already_activated, | |
18 | HomeSetup *setup) { | |
19 | ||
70a5db58 LP |
20 | assert(h); |
21 | assert(setup); | |
22 | assert(user_record_storage(h) == USER_CIFS); | |
23 | ||
24 | if (already_activated) | |
25 | setup->root_fd = open(user_record_home_directory(h), O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW); | |
26 | else { | |
27 | bool mounted = false; | |
00c7b071 YW |
28 | char **pw; |
29 | int r; | |
70a5db58 | 30 | |
6a220cdb | 31 | r = home_unshare_and_mount(NULL, NULL, false, user_record_mount_flags(h)); |
70a5db58 LP |
32 | if (r < 0) |
33 | return r; | |
34 | ||
35 | STRV_FOREACH(pw, h->password) { | |
36 | _cleanup_(unlink_and_freep) char *p = NULL; | |
37 | _cleanup_free_ char *options = NULL; | |
38 | _cleanup_(fclosep) FILE *f = NULL; | |
39 | pid_t mount_pid; | |
40 | int exit_status; | |
41 | ||
42 | r = fopen_temporary(NULL, &f, &p); | |
43 | if (r < 0) | |
44 | return log_error_errno(r, "Failed to create temporary credentials file: %m"); | |
45 | ||
46 | fprintf(f, | |
47 | "username=%s\n" | |
48 | "password=%s\n", | |
49 | user_record_cifs_user_name(h), | |
50 | *pw); | |
51 | ||
52 | if (h->cifs_domain) | |
53 | fprintf(f, "domain=%s\n", h->cifs_domain); | |
54 | ||
55 | r = fflush_and_check(f); | |
56 | if (r < 0) | |
57 | return log_error_errno(r, "Failed to write temporary credentials file: %m"); | |
58 | ||
59 | f = safe_fclose(f); | |
60 | ||
61 | if (asprintf(&options, "credentials=%s,uid=" UID_FMT ",forceuid,gid=" UID_FMT ",forcegid,file_mode=0%3o,dir_mode=0%3o", | |
62 | p, h->uid, h->uid, h->access_mode, h->access_mode) < 0) | |
63 | return log_oom(); | |
64 | ||
65 | r = safe_fork("(mount)", FORK_RESET_SIGNALS|FORK_RLIMIT_NOFILE_SAFE|FORK_DEATHSIG|FORK_LOG|FORK_STDOUT_TO_STDERR, &mount_pid); | |
66 | if (r < 0) | |
67 | return r; | |
68 | if (r == 0) { | |
69 | /* Child */ | |
70 | execl("/bin/mount", "/bin/mount", "-n", "-t", "cifs", | |
71 | h->cifs_service, "/run/systemd/user-home-mount", | |
72 | "-o", options, NULL); | |
73 | ||
74 | log_error_errno(errno, "Failed to execute fsck: %m"); | |
75 | _exit(EXIT_FAILURE); | |
76 | } | |
77 | ||
78 | exit_status = wait_for_terminate_and_check("mount", mount_pid, WAIT_LOG_ABNORMAL|WAIT_LOG_NON_ZERO_EXIT_STATUS); | |
79 | if (exit_status < 0) | |
80 | return exit_status; | |
81 | if (exit_status != EXIT_SUCCESS) | |
82 | return -EPROTO; | |
83 | ||
84 | mounted = true; | |
85 | break; | |
86 | } | |
87 | ||
88 | if (!mounted) | |
89 | return log_error_errno(ENOKEY, "Failed to mount home directory with supplied password."); | |
90 | ||
91 | setup->root_fd = open("/run/systemd/user-home-mount", O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW); | |
92 | } | |
93 | if (setup->root_fd < 0) | |
00c7b071 | 94 | return log_error_errno(errno, "Failed to open home directory: %m"); |
70a5db58 LP |
95 | |
96 | return 0; | |
97 | } | |
98 | ||
99 | int home_activate_cifs( | |
100 | UserRecord *h, | |
7b78db28 | 101 | PasswordCache *cache, |
70a5db58 LP |
102 | UserRecord **ret_home) { |
103 | ||
104 | _cleanup_(home_setup_undo) HomeSetup setup = HOME_SETUP_INIT; | |
105 | _cleanup_(user_record_unrefp) UserRecord *new_home = NULL; | |
106 | const char *hdo, *hd; | |
107 | int r; | |
108 | ||
109 | assert(h); | |
110 | assert(user_record_storage(h) == USER_CIFS); | |
111 | assert(ret_home); | |
112 | ||
113 | if (!h->cifs_service) | |
114 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks CIFS service, refusing."); | |
115 | ||
116 | assert_se(hdo = user_record_home_directory(h)); | |
117 | hd = strdupa(hdo); /* copy the string out, since it might change later in the home record object */ | |
118 | ||
119 | r = home_prepare_cifs(h, false, &setup); | |
120 | if (r < 0) | |
121 | return r; | |
122 | ||
7b78db28 | 123 | r = home_refresh(h, &setup, NULL, cache, NULL, &new_home); |
70a5db58 LP |
124 | if (r < 0) |
125 | return r; | |
126 | ||
127 | setup.root_fd = safe_close(setup.root_fd); | |
128 | ||
129 | r = home_move_mount(NULL, hd); | |
130 | if (r < 0) | |
131 | return r; | |
132 | ||
133 | setup.undo_mount = false; | |
134 | ||
135 | log_info("Everything completed."); | |
136 | ||
137 | *ret_home = TAKE_PTR(new_home); | |
138 | return 1; | |
139 | } | |
140 | ||
141 | int home_create_cifs(UserRecord *h, UserRecord **ret_home) { | |
142 | _cleanup_(home_setup_undo) HomeSetup setup = HOME_SETUP_INIT; | |
143 | _cleanup_(user_record_unrefp) UserRecord *new_home = NULL; | |
144 | _cleanup_(closedirp) DIR *d = NULL; | |
8e06af80 VC |
145 | _cleanup_close_ int copy = -1; |
146 | int r; | |
70a5db58 LP |
147 | |
148 | assert(h); | |
149 | assert(user_record_storage(h) == USER_CIFS); | |
150 | assert(ret_home); | |
151 | ||
152 | if (!h->cifs_service) | |
153 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "User record lacks CIFS service, refusing."); | |
154 | ||
155 | if (access("/sbin/mount.cifs", F_OK) < 0) { | |
156 | if (errno == ENOENT) | |
157 | return log_error_errno(SYNTHETIC_ERRNO(ENOLINK), "/sbin/mount.cifs is missing."); | |
158 | ||
159 | return log_error_errno(errno, "Unable to detect whether /sbin/mount.cifs exists: %m"); | |
160 | } | |
161 | ||
162 | r = home_prepare_cifs(h, false, &setup); | |
163 | if (r < 0) | |
164 | return r; | |
165 | ||
166 | copy = fcntl(setup.root_fd, F_DUPFD_CLOEXEC, 3); | |
167 | if (copy < 0) | |
168 | return -errno; | |
169 | ||
8e06af80 VC |
170 | d = take_fdopendir(©); |
171 | if (!d) | |
70a5db58 | 172 | return -errno; |
70a5db58 LP |
173 | |
174 | errno = 0; | |
175 | if (readdir_no_dot(d)) | |
176 | return log_error_errno(SYNTHETIC_ERRNO(ENOTEMPTY), "Selected CIFS directory not empty, refusing."); | |
177 | if (errno != 0) | |
178 | return log_error_errno(errno, "Failed to detect if CIFS directory is empty: %m"); | |
179 | ||
180 | r = home_populate(h, setup.root_fd); | |
181 | if (r < 0) | |
182 | return r; | |
183 | ||
184 | r = home_sync_and_statfs(setup.root_fd, NULL); | |
185 | if (r < 0) | |
186 | return r; | |
187 | ||
188 | r = user_record_clone(h, USER_RECORD_LOAD_MASK_SECRET, &new_home); | |
189 | if (r < 0) | |
190 | return log_error_errno(r, "Failed to clone record: %m"); | |
191 | ||
192 | r = user_record_add_binding( | |
193 | new_home, | |
194 | USER_CIFS, | |
195 | NULL, | |
196 | SD_ID128_NULL, | |
197 | SD_ID128_NULL, | |
198 | SD_ID128_NULL, | |
199 | NULL, | |
200 | NULL, | |
201 | UINT64_MAX, | |
202 | NULL, | |
203 | NULL, | |
204 | h->uid, | |
205 | (gid_t) h->uid); | |
206 | if (r < 0) | |
207 | return log_error_errno(r, "Failed to add binding to record: %m"); | |
208 | ||
209 | log_info("Everything completed."); | |
210 | ||
211 | *ret_home = TAKE_PTR(new_home); | |
212 | return 0; | |
213 | } |