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134 lines
3.7 KiB
C
134 lines
3.7 KiB
C
/*
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Copyright (c) 2001-2006, Gerrit Pape
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "libbb.h"
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/* Always sets uid and gid */
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int get_uidgid(struct bb_uidgid_t *u, const char *ug, int numeric_ok)
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{
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struct passwd *pwd;
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struct group *gr;
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char *user, *group;
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unsigned n;
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user = (char*)ug;
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group = strchr(ug, ':');
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if (group) {
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int sz = (++group) - ug;
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user = alloca(sz);
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/* copies sz-1 bytes, stores terminating '\0' */
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safe_strncpy(user, ug, sz);
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}
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if (numeric_ok) {
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n = bb_strtou(user, NULL, 10);
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if (!errno) {
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u->uid = n;
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pwd = getpwuid(n);
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/* If we have e.g. "500" string without user */
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/* with uid 500 in /etc/passwd, we set gid == uid */
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u->gid = pwd ? pwd->pw_gid : n;
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goto skip;
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}
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}
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/* Either it is not numeric, or caller disallows numeric username */
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pwd = getpwnam(user);
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if (!pwd)
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return 0;
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u->uid = pwd->pw_uid;
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u->gid = pwd->pw_gid;
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skip:
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if (group) {
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if (numeric_ok) {
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n = bb_strtou(group, NULL, 10);
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if (!errno) {
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u->gid = n;
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return 1;
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}
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}
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gr = getgrnam(group);
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if (!gr) return 0;
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u->gid = gr->gr_gid;
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}
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return 1;
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}
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/* chown-like:
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* "user" sets uid only,
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* ":group" sets gid only
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* "user:" sets uid and gid (to user's primary group id)
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* "user:group" sets uid and gid
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* ('unset' uid or gid is actually set to -1)
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*/
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void parse_chown_usergroup_or_die(struct bb_uidgid_t *u, char *user_group)
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{
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char *group;
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u->uid = -1;
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u->gid = -1;
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/* Check if there is a group name */
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group = strchr(user_group, '.'); /* deprecated? */
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if (!group)
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group = strchr(user_group, ':');
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else
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*group = ':'; /* replace '.' with ':' */
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/* Parse "user[:[group]]" */
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if (!group) { /* "user" */
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u->uid = get_ug_id(user_group, xuname2uid);
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} else if (group == user_group) { /* ":group" */
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u->gid = get_ug_id(group + 1, xgroup2gid);
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} else {
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if (!group[1]) /* "user:" */
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*group = '\0';
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if (!get_uidgid(u, user_group, 1))
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bb_error_msg_and_die("unknown user/group %s", user_group);
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}
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}
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#if 0
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#include <stdio.h>
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int main()
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{
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unsigned u;
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struct bb_uidgid_t ug;
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u = get_uidgid(&ug, "apache", 0);
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printf("%u = %u:%u\n", u, ug.uid, ug.gid);
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ug.uid = ug.gid = 1111;
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u = get_uidgid(&ug, "apache", 0);
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printf("%u = %u:%u\n", u, ug.uid, ug.gid);
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ug.uid = ug.gid = 1111;
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u = get_uidgid(&ug, "apache:users", 0);
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printf("%u = %u:%u\n", u, ug.uid, ug.gid);
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ug.uid = ug.gid = 1111;
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u = get_uidgid(&ug, "apache:users", 0);
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printf("%u = %u:%u\n", u, ug.uid, ug.gid);
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return 0;
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}
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#endif
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