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a9f0f5e5 ZJS |
1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2 | ||
3 | #include <stdint.h> | |
4 | #include <sys/mount.h> | |
5 | ||
07ee5adb LP |
6 | #include "sd-bus.h" |
7 | ||
8 | #include "bus-error.h" | |
a9f0f5e5 ZJS |
9 | #include "fs-util.h" |
10 | #include "label.h" | |
5e332028 | 11 | #include "main-func.h" |
a9f0f5e5 | 12 | #include "mkdir.h" |
049af8ad | 13 | #include "mountpoint-util.h" |
a9f0f5e5 ZJS |
14 | #include "path-util.h" |
15 | #include "rm-rf.h" | |
81375d80 | 16 | #include "selinux-util.h" |
a9f0f5e5 ZJS |
17 | #include "smack-util.h" |
18 | #include "stdio-util.h" | |
19 | #include "string-util.h" | |
20 | #include "strv.h" | |
21 | #include "user-util.h" | |
22 | ||
07ee5adb LP |
23 | static int acquire_runtime_dir_size(uint64_t *ret) { |
24 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
25 | _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL; | |
a9f0f5e5 ZJS |
26 | int r; |
27 | ||
07ee5adb LP |
28 | r = sd_bus_default_system(&bus); |
29 | if (r < 0) | |
30 | return log_error_errno(r, "Failed to connect to system bus: %m"); | |
a9f0f5e5 | 31 | |
07ee5adb | 32 | r = sd_bus_get_property_trivial(bus, "org.freedesktop.login1", "/org/freedesktop/login1", "org.freedesktop.login1.Manager", "RuntimeDirectorySize", &error, 't', ret); |
a9f0f5e5 | 33 | if (r < 0) |
07ee5adb | 34 | return log_error_errno(r, "Failed to acquire runtime directory size: %s", bus_error_message(&error, r)); |
a9f0f5e5 | 35 | |
a9f0f5e5 ZJS |
36 | return 0; |
37 | } | |
38 | ||
07ee5adb LP |
39 | static int user_mkdir_runtime_path( |
40 | const char *runtime_path, | |
41 | uid_t uid, | |
42 | gid_t gid, | |
43 | uint64_t runtime_dir_size) { | |
44 | ||
a9f0f5e5 ZJS |
45 | int r; |
46 | ||
47 | assert(runtime_path); | |
48 | assert(path_is_absolute(runtime_path)); | |
49 | assert(uid_is_valid(uid)); | |
50 | assert(gid_is_valid(gid)); | |
51 | ||
52 | r = mkdir_safe_label("/run/user", 0755, 0, 0, MKDIR_WARN_MODE); | |
53 | if (r < 0) | |
54 | return log_error_errno(r, "Failed to create /run/user: %m"); | |
55 | ||
56 | if (path_is_mount_point(runtime_path, NULL, 0) >= 0) | |
57 | log_debug("%s is already a mount point", runtime_path); | |
58 | else { | |
59 | char options[sizeof("mode=0700,uid=,gid=,size=,smackfsroot=*") | |
60 | + DECIMAL_STR_MAX(uid_t) | |
61 | + DECIMAL_STR_MAX(gid_t) | |
07ee5adb | 62 | + DECIMAL_STR_MAX(uint64_t)]; |
a9f0f5e5 ZJS |
63 | |
64 | xsprintf(options, | |
07ee5adb | 65 | "mode=0700,uid=" UID_FMT ",gid=" GID_FMT ",size=%" PRIu64 "%s", |
a9f0f5e5 ZJS |
66 | uid, gid, runtime_dir_size, |
67 | mac_smack_use() ? ",smackfsroot=*" : ""); | |
68 | ||
69 | (void) mkdir_label(runtime_path, 0700); | |
70 | ||
71 | r = mount("tmpfs", runtime_path, "tmpfs", MS_NODEV|MS_NOSUID, options); | |
72 | if (r < 0) { | |
73 | if (!IN_SET(errno, EPERM, EACCES)) { | |
74 | r = log_error_errno(errno, "Failed to mount per-user tmpfs directory %s: %m", runtime_path); | |
75 | goto fail; | |
76 | } | |
77 | ||
78 | log_debug_errno(errno, "Failed to mount per-user tmpfs directory %s.\n" | |
79 | "Assuming containerized execution, ignoring: %m", runtime_path); | |
80 | ||
81 | r = chmod_and_chown(runtime_path, 0700, uid, gid); | |
82 | if (r < 0) { | |
83 | log_error_errno(r, "Failed to change ownership and mode of \"%s\": %m", runtime_path); | |
84 | goto fail; | |
85 | } | |
86 | } | |
87 | ||
88 | r = label_fix(runtime_path, 0); | |
89 | if (r < 0) | |
90 | log_warning_errno(r, "Failed to fix label of \"%s\", ignoring: %m", runtime_path); | |
91 | } | |
92 | ||
93 | return 0; | |
94 | ||
95 | fail: | |
96 | /* Try to clean up, but ignore errors */ | |
97 | (void) rmdir(runtime_path); | |
98 | return r; | |
99 | } | |
100 | ||
101 | static int user_remove_runtime_path(const char *runtime_path) { | |
102 | int r; | |
103 | ||
104 | assert(runtime_path); | |
105 | assert(path_is_absolute(runtime_path)); | |
106 | ||
107 | r = rm_rf(runtime_path, 0); | |
108 | if (r < 0) | |
3a13442b | 109 | log_debug_errno(r, "Failed to remove runtime directory %s (before unmounting), ignoring: %m", runtime_path); |
a9f0f5e5 | 110 | |
3a13442b LP |
111 | /* Ignore cases where the directory isn't mounted, as that's quite possible, if we lacked the permissions to |
112 | * mount something */ | |
a9f0f5e5 ZJS |
113 | r = umount2(runtime_path, MNT_DETACH); |
114 | if (r < 0 && !IN_SET(errno, EINVAL, ENOENT)) | |
3a13442b | 115 | log_debug_errno(errno, "Failed to unmount user runtime directory %s, ignoring: %m", runtime_path); |
a9f0f5e5 ZJS |
116 | |
117 | r = rm_rf(runtime_path, REMOVE_ROOT); | |
3a13442b LP |
118 | if (r < 0 && r != -ENOENT) |
119 | return log_error_errno(r, "Failed to remove runtime directory %s (after unmounting): %m", runtime_path); | |
a9f0f5e5 | 120 | |
3a13442b | 121 | return 0; |
a9f0f5e5 ZJS |
122 | } |
123 | ||
86d18f3b YW |
124 | static int do_mount(const char *user) { |
125 | char runtime_path[sizeof("/run/user") + DECIMAL_STR_MAX(uid_t)]; | |
07ee5adb | 126 | uint64_t runtime_dir_size; |
86d18f3b YW |
127 | uid_t uid; |
128 | gid_t gid; | |
129 | int r; | |
130 | ||
fafff8f1 | 131 | r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0); |
86d18f3b YW |
132 | if (r < 0) |
133 | return log_error_errno(r, | |
134 | r == -ESRCH ? "No such user \"%s\"" : | |
135 | r == -ENOMSG ? "UID \"%s\" is invalid or has an invalid main group" | |
136 | : "Failed to look up user \"%s\": %m", | |
137 | user); | |
138 | ||
07ee5adb LP |
139 | r = acquire_runtime_dir_size(&runtime_dir_size); |
140 | if (r < 0) | |
141 | return r; | |
a9f0f5e5 | 142 | |
07ee5adb | 143 | xsprintf(runtime_path, "/run/user/" UID_FMT, uid); |
a9f0f5e5 ZJS |
144 | |
145 | log_debug("Will mount %s owned by "UID_FMT":"GID_FMT, runtime_path, uid, gid); | |
146 | return user_mkdir_runtime_path(runtime_path, uid, gid, runtime_dir_size); | |
147 | } | |
148 | ||
86d18f3b YW |
149 | static int do_umount(const char *user) { |
150 | char runtime_path[sizeof("/run/user") + DECIMAL_STR_MAX(uid_t)]; | |
151 | uid_t uid; | |
152 | int r; | |
153 | ||
154 | /* The user may be already removed. So, first try to parse the string by parse_uid(), | |
155 | * and if it fails, fallback to get_user_creds().*/ | |
156 | if (parse_uid(user, &uid) < 0) { | |
fafff8f1 | 157 | r = get_user_creds(&user, &uid, NULL, NULL, NULL, 0); |
86d18f3b YW |
158 | if (r < 0) |
159 | return log_error_errno(r, | |
160 | r == -ESRCH ? "No such user \"%s\"" : | |
161 | r == -ENOMSG ? "UID \"%s\" is invalid or has an invalid main group" | |
162 | : "Failed to look up user \"%s\": %m", | |
163 | user); | |
164 | } | |
165 | ||
166 | xsprintf(runtime_path, "/run/user/" UID_FMT, uid); | |
167 | ||
a9f0f5e5 ZJS |
168 | log_debug("Will remove %s", runtime_path); |
169 | return user_remove_runtime_path(runtime_path); | |
170 | } | |
171 | ||
cc639ee7 | 172 | static int run(int argc, char *argv[]) { |
a9f0f5e5 ZJS |
173 | int r; |
174 | ||
175 | log_parse_environment(); | |
176 | log_open(); | |
177 | ||
baaa35ad ZJS |
178 | if (argc != 3) |
179 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
180 | "This program takes two arguments."); | |
181 | if (!STR_IN_SET(argv[1], "start", "stop")) | |
182 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
183 | "First argument must be either \"start\" or \"stop\"."); | |
a9f0f5e5 | 184 | |
81375d80 | 185 | r = mac_selinux_init(); |
cc639ee7 ZJS |
186 | if (r < 0) |
187 | return log_error_errno(r, "Could not initialize labelling: %m\n"); | |
81375d80 | 188 | |
a9f0f5e5 ZJS |
189 | umask(0022); |
190 | ||
a9f0f5e5 | 191 | if (streq(argv[1], "start")) |
cc639ee7 ZJS |
192 | return do_mount(argv[2]); |
193 | if (streq(argv[1], "stop")) | |
194 | return do_umount(argv[2]); | |
195 | assert_not_reached("Unknown verb!"); | |
a9f0f5e5 | 196 | } |
cc639ee7 ZJS |
197 | |
198 | DEFINE_MAIN_FUNCTION(run); |