summaryrefslogtreecommitdiffstats
path: root/src/tmpfiles/offline-passwd.c
blob: 7b5592b9c289b705d45cfdb8980881a168ac9f9d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include "chase.h"
#include "fd-util.h"
#include "offline-passwd.h"
#include "path-util.h"
#include "user-util.h"

DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR(uid_gid_hash_ops, char, string_hash_func, string_compare_func, free);

static int open_passwd_file(const char *root, const char *fname, FILE **ret_file) {
        _cleanup_free_ char *p = NULL;
        _cleanup_close_ int fd = -EBADF;
        _cleanup_fclose_ FILE *f = NULL;

        fd = chase_and_open(fname, root, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC, &p);
        if (fd < 0)
                return fd;

        f = fdopen(fd, "r");
        if (!f)
                return -errno;

        TAKE_FD(fd);

        if (DEBUG_LOGGING) {
                _cleanup_free_ char *bn = NULL;

                (void) path_extract_filename(fname, &bn);
                log_debug("Reading %s entries from %s...", strna(bn), p);
        }

        *ret_file = TAKE_PTR(f);
        return 0;
}

static int populate_uid_cache(const char *root, Hashmap **ret) {
        _cleanup_hashmap_free_ Hashmap *cache = NULL;
        int r;

        cache = hashmap_new(&uid_gid_hash_ops);
        if (!cache)
                return -ENOMEM;

        /* The directory list is hardcoded here: /etc is the standard, and rpm-ostree uses /usr/lib. This
         * could be made configurable, but I don't see the point right now. */

        FOREACH_STRING(fname, "/etc/passwd", "/usr/lib/passwd") {
                _cleanup_fclose_ FILE *f = NULL;

                r = open_passwd_file(root, fname, &f);
                if (r == -ENOENT)
                        continue;
                if (r < 0)
                        return r;

                struct passwd *pw;
                while ((r = fgetpwent_sane(f, &pw)) > 0) {
                        _cleanup_free_ char *n = NULL;

                        n = strdup(pw->pw_name);
                        if (!n)
                                return -ENOMEM;

                        r = hashmap_put(cache, n, UID_TO_PTR(pw->pw_uid));
                        if (IN_SET(r, 0, -EEXIST))
                                continue;
                        if (r < 0)
                                return r;
                        TAKE_PTR(n);
                }
        }

        *ret = TAKE_PTR(cache);
        return 0;
}

static int populate_gid_cache(const char *root, Hashmap **ret) {
        _cleanup_hashmap_free_ Hashmap *cache = NULL;
        int r;

        cache = hashmap_new(&uid_gid_hash_ops);
        if (!cache)
                return -ENOMEM;

        FOREACH_STRING(fname, "/etc/group", "/usr/lib/group") {
                _cleanup_fclose_ FILE *f = NULL;

                r = open_passwd_file(root, fname, &f);
                if (r == -ENOENT)
                        continue;
                if (r < 0)
                        return r;

                struct group *gr;
                while ((r = fgetgrent_sane(f, &gr)) > 0) {
                        _cleanup_free_ char *n = NULL;

                        n = strdup(gr->gr_name);
                        if (!n)
                                return -ENOMEM;

                        r = hashmap_put(cache, n, GID_TO_PTR(gr->gr_gid));
                        if (IN_SET(r, 0, -EEXIST))
                                continue;
                        if (r < 0)
                                return r;
                        TAKE_PTR(n);
                }
        }

        *ret = TAKE_PTR(cache);
        return 0;
}

int name_to_uid_offline(
                const char *root,
                const char *user,
                uid_t *ret_uid,
                Hashmap **cache) {

        void *found;
        int r;

        assert(user);
        assert(ret_uid);
        assert(cache);

        if (!*cache) {
                r = populate_uid_cache(root, cache);
                if (r < 0)
                        return r;
        }

        found = hashmap_get(*cache, user);
        if (!found)
                return -ESRCH;

        *ret_uid = PTR_TO_UID(found);
        return 0;
}

int name_to_gid_offline(
                const char *root,
                const char *group,
                gid_t *ret_gid,
                Hashmap **cache) {

        void *found;
        int r;

        assert(group);
        assert(ret_gid);
        assert(cache);

        if (!*cache) {
                r = populate_gid_cache(root, cache);
                if (r < 0)
                        return r;
        }

        found = hashmap_get(*cache, group);
        if (!found)
                return -ESRCH;

        *ret_gid = PTR_TO_GID(found);
        return 0;
}