diff options
Diffstat (limited to '')
| -rw-r--r-- | plugins/group_file/getgrent.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/plugins/group_file/getgrent.c b/plugins/group_file/getgrent.c new file mode 100644 index 0000000..f37fb0e --- /dev/null +++ b/plugins/group_file/getgrent.c @@ -0,0 +1,193 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 2005,2008,2010-2015,2022 Todd C. Miller <Todd.Miller@sudo.ws> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* + * This is an open source non-commercial project. Dear PVS-Studio, please check it. + * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com + */ + +/* + * Trivial replacements for the libc getgrent() family of functions. + */ + +#include <config.h> + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <fcntl.h> +#include <limits.h> +#include <grp.h> + +#include "sudo_compat.h" +#include "sudo_util.h" + +#undef GRMEM_MAX +#define GRMEM_MAX 200 + +static FILE *grf; +static const char *grfile = "/etc/group"; +static int gr_stayopen; + +void mysetgrfile(const char *); +void mysetgrent(void); +void myendgrent(void); +int mysetgroupent(int); +struct group *mygetgrent(void); +struct group *mygetgrnam(const char *); +struct group *mygetgrgid(gid_t); + +void +mysetgrfile(const char *file) +{ + grfile = file; + if (grf != NULL) + myendgrent(); +} + +static int +open_group(int reset) +{ + if (grf == NULL) { + grf = fopen(grfile, "r"); + if (grf != NULL) { + if (fcntl(fileno(grf), F_SETFD, FD_CLOEXEC) == -1) { + fclose(grf); + grf = NULL; + } + } + if (grf == NULL) + return 0; + } else if (reset) { + rewind(grf); + } + return 1; +} + +int +mysetgroupent(int stayopen) +{ + if (!open_group(1)) + return 0; + gr_stayopen = stayopen; + return 1; +} + +void +mysetgrent(void) +{ + mysetgroupent(0); +} + +void +myendgrent(void) +{ + if (grf != NULL) { + fclose(grf); + grf = NULL; + } + gr_stayopen = 0; +} + +struct group * +mygetgrent(void) +{ + static struct group gr; + static char grbuf[LINE_MAX], *gr_mem[GRMEM_MAX+1]; + size_t len; + id_t id; + char *cp, *colon; + const char *errstr; + int n; + + if (!open_group(0)) + return NULL; + +next_entry: + if ((colon = fgets(grbuf, sizeof(grbuf), grf)) == NULL) + return NULL; + + memset(&gr, 0, sizeof(gr)); + if ((colon = strchr(cp = colon, ':')) == NULL) + goto next_entry; + *colon++ = '\0'; + gr.gr_name = cp; + if ((colon = strchr(cp = colon, ':')) == NULL) + goto next_entry; + *colon++ = '\0'; + gr.gr_passwd = cp; + if ((colon = strchr(cp = colon, ':')) == NULL) + goto next_entry; + *colon++ = '\0'; + id = sudo_strtoid(cp, &errstr); + if (errstr != NULL) + goto next_entry; + gr.gr_gid = (gid_t)id; + len = strlen(colon); + if (len > 0 && colon[len - 1] == '\n') + colon[len - 1] = '\0'; + if (*colon != '\0') { + char *last; + + gr.gr_mem = gr_mem; + cp = strtok_r(colon, ",", &last); + for (n = 0; cp != NULL && n < GRMEM_MAX; n++) { + gr.gr_mem[n] = cp; + cp = strtok_r(NULL, ",", &last); + } + gr.gr_mem[n] = NULL; + } else + gr.gr_mem = NULL; + return &gr; +} + +struct group * +mygetgrnam(const char *name) +{ + struct group *gr; + + if (!open_group(1)) + return NULL; + while ((gr = mygetgrent()) != NULL) { + if (strcmp(gr->gr_name, name) == 0) + break; + } + if (!gr_stayopen) { + fclose(grf); + grf = NULL; + } + return gr; +} + +struct group * +mygetgrgid(gid_t gid) +{ + struct group *gr; + + if (!open_group(1)) + return NULL; + while ((gr = mygetgrent()) != NULL) { + if (gr->gr_gid == gid) + break; + } + if (!gr_stayopen) { + fclose(grf); + grf = NULL; + } + return gr; +} |