mirror of https://github.com/sudo-project/sudo.git
194 lines
3.9 KiB
C
194 lines
3.9 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2005,2008,2010-2015,2022 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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/*
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* Trivial replacements for the libc getgrent() family of functions.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <grp.h>
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#include <sudo_compat.h>
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#include <sudo_util.h>
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#undef GRMEM_MAX
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#define GRMEM_MAX 200
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static FILE *grf;
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static const char *grfile = "/etc/group";
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static int gr_stayopen;
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void mysetgrfile(const char *);
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void mysetgrent(void);
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void myendgrent(void);
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int mysetgroupent(int);
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struct group *mygetgrent(void);
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struct group *mygetgrnam(const char *);
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struct group *mygetgrgid(gid_t);
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void
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mysetgrfile(const char *file)
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{
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grfile = file;
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if (grf != NULL)
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myendgrent();
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}
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static int
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open_group(int reset)
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{
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if (grf == NULL) {
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grf = fopen(grfile, "r");
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if (grf != NULL) {
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if (fcntl(fileno(grf), F_SETFD, FD_CLOEXEC) == -1) {
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fclose(grf);
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grf = NULL;
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}
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}
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if (grf == NULL)
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return 0;
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} else if (reset) {
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rewind(grf);
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}
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return 1;
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}
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int
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mysetgroupent(int stayopen)
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{
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if (!open_group(1))
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return 0;
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gr_stayopen = stayopen;
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return 1;
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}
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void
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mysetgrent(void)
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{
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mysetgroupent(0);
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}
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void
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myendgrent(void)
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{
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if (grf != NULL) {
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fclose(grf);
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grf = NULL;
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}
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gr_stayopen = 0;
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}
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struct group *
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mygetgrent(void)
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{
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static struct group gr;
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static char grbuf[LINE_MAX], *gr_mem[GRMEM_MAX+1];
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size_t len;
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id_t id;
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char *cp, *colon;
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const char *errstr;
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int n;
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if (!open_group(0))
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return NULL;
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next_entry:
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if ((colon = fgets(grbuf, sizeof(grbuf), grf)) == NULL)
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return NULL;
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memset(&gr, 0, sizeof(gr));
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if ((colon = strchr(cp = colon, ':')) == NULL)
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goto next_entry;
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*colon++ = '\0';
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gr.gr_name = cp;
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if ((colon = strchr(cp = colon, ':')) == NULL)
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goto next_entry;
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*colon++ = '\0';
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gr.gr_passwd = cp;
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if ((colon = strchr(cp = colon, ':')) == NULL)
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goto next_entry;
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*colon++ = '\0';
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id = sudo_strtoid(cp, &errstr);
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if (errstr != NULL)
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goto next_entry;
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gr.gr_gid = (gid_t)id;
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len = strlen(colon);
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if (len > 0 && colon[len - 1] == '\n')
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colon[len - 1] = '\0';
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if (*colon != '\0') {
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char *last;
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gr.gr_mem = gr_mem;
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cp = strtok_r(colon, ",", &last);
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for (n = 0; cp != NULL && n < GRMEM_MAX; n++) {
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gr.gr_mem[n] = cp;
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cp = strtok_r(NULL, ",", &last);
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}
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gr.gr_mem[n] = NULL;
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} else
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gr.gr_mem = NULL;
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return &gr;
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}
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struct group *
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mygetgrnam(const char *name)
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{
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struct group *gr;
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if (!open_group(1))
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return NULL;
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while ((gr = mygetgrent()) != NULL) {
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if (strcmp(gr->gr_name, name) == 0)
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break;
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}
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if (!gr_stayopen) {
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fclose(grf);
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grf = NULL;
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}
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return gr;
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}
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struct group *
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mygetgrgid(gid_t gid)
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{
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struct group *gr;
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if (!open_group(1))
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return NULL;
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while ((gr = mygetgrent()) != NULL) {
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if (gr->gr_gid == gid)
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break;
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}
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if (!gr_stayopen) {
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fclose(grf);
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grf = NULL;
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}
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return gr;
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}
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