[1765] | 1 | /*
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| 2 | Copyright (c) 2001-2006, Gerrit Pape
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| 3 | All rights reserved.
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| 4 |
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| 5 | Redistribution and use in source and binary forms, with or without
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| 6 | modification, are permitted provided that the following conditions are met:
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| 7 |
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| 8 | 1. Redistributions of source code must retain the above copyright notice,
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| 9 | this list of conditions and the following disclaimer.
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| 10 | 2. Redistributions in binary form must reproduce the above copyright
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| 11 | notice, this list of conditions and the following disclaimer in the
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| 12 | documentation and/or other materials provided with the distribution.
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| 13 | 3. The name of the author may not be used to endorse or promote products
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| 14 | derived from this software without specific prior written permission.
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| 15 |
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| 16 | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 17 | WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 18 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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| 19 | EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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| 20 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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| 21 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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| 22 | OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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| 23 | WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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| 24 | OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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| 25 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 26 | */
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| 27 |
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| 28 | #include "libbb.h"
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| 29 |
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| 30 | /* Always sets uid and gid */
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[2725] | 31 | int FAST_FUNC get_uidgid(struct bb_uidgid_t *u, const char *ug, int numeric_ok)
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[1765] | 32 | {
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| 33 | struct passwd *pwd;
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| 34 | struct group *gr;
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| 35 | char *user, *group;
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| 36 | unsigned n;
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| 37 |
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| 38 | user = (char*)ug;
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| 39 | group = strchr(ug, ':');
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| 40 | if (group) {
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| 41 | int sz = (++group) - ug;
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| 42 | user = alloca(sz);
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| 43 | /* copies sz-1 bytes, stores terminating '\0' */
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| 44 | safe_strncpy(user, ug, sz);
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| 45 | }
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| 46 | if (numeric_ok) {
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| 47 | n = bb_strtou(user, NULL, 10);
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| 48 | if (!errno) {
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| 49 | u->uid = n;
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| 50 | pwd = getpwuid(n);
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| 51 | /* If we have e.g. "500" string without user */
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| 52 | /* with uid 500 in /etc/passwd, we set gid == uid */
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| 53 | u->gid = pwd ? pwd->pw_gid : n;
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| 54 | goto skip;
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| 55 | }
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| 56 | }
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| 57 | /* Either it is not numeric, or caller disallows numeric username */
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| 58 | pwd = getpwnam(user);
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| 59 | if (!pwd)
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| 60 | return 0;
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| 61 | u->uid = pwd->pw_uid;
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| 62 | u->gid = pwd->pw_gid;
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| 63 |
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| 64 | skip:
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| 65 | if (group) {
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| 66 | if (numeric_ok) {
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| 67 | n = bb_strtou(group, NULL, 10);
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| 68 | if (!errno) {
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| 69 | u->gid = n;
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| 70 | return 1;
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| 71 | }
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| 72 | }
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| 73 | gr = getgrnam(group);
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| 74 | if (!gr) return 0;
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| 75 | u->gid = gr->gr_gid;
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| 76 | }
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| 77 | return 1;
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| 78 | }
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[2725] | 79 | void FAST_FUNC xget_uidgid(struct bb_uidgid_t *u, const char *ug)
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| 80 | {
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| 81 | if (!get_uidgid(u, ug, 1))
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| 82 | bb_error_msg_and_die("unknown user/group %s", ug);
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| 83 | }
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[1765] | 84 |
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| 85 | /* chown-like:
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| 86 | * "user" sets uid only,
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| 87 | * ":group" sets gid only
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| 88 | * "user:" sets uid and gid (to user's primary group id)
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| 89 | * "user:group" sets uid and gid
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[2725] | 90 | * ('unset' uid or gid retains the value it has on entry)
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[1765] | 91 | */
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[2725] | 92 | void FAST_FUNC parse_chown_usergroup_or_die(struct bb_uidgid_t *u, char *user_group)
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[1765] | 93 | {
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| 94 | char *group;
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| 95 |
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| 96 | /* Check if there is a group name */
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| 97 | group = strchr(user_group, '.'); /* deprecated? */
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| 98 | if (!group)
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| 99 | group = strchr(user_group, ':');
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| 100 | else
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| 101 | *group = ':'; /* replace '.' with ':' */
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| 102 |
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| 103 | /* Parse "user[:[group]]" */
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| 104 | if (!group) { /* "user" */
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| 105 | u->uid = get_ug_id(user_group, xuname2uid);
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| 106 | } else if (group == user_group) { /* ":group" */
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| 107 | u->gid = get_ug_id(group + 1, xgroup2gid);
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| 108 | } else {
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| 109 | if (!group[1]) /* "user:" */
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| 110 | *group = '\0';
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[2725] | 111 | xget_uidgid(u, user_group);
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[1765] | 112 | }
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| 113 | }
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| 114 |
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| 115 | #if 0
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| 116 | #include <stdio.h>
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| 117 | int main()
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| 118 | {
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| 119 | unsigned u;
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| 120 | struct bb_uidgid_t ug;
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| 121 | u = get_uidgid(&ug, "apache", 0);
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| 122 | printf("%u = %u:%u\n", u, ug.uid, ug.gid);
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| 123 | ug.uid = ug.gid = 1111;
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| 124 | u = get_uidgid(&ug, "apache", 0);
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| 125 | printf("%u = %u:%u\n", u, ug.uid, ug.gid);
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| 126 | ug.uid = ug.gid = 1111;
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| 127 | u = get_uidgid(&ug, "apache:users", 0);
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| 128 | printf("%u = %u:%u\n", u, ug.uid, ug.gid);
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| 129 | ug.uid = ug.gid = 1111;
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| 130 | u = get_uidgid(&ug, "apache:users", 0);
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| 131 | printf("%u = %u:%u\n", u, ug.uid, ug.gid);
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| 132 | return 0;
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| 133 | }
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| 134 | #endif
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