diff options
Diffstat (limited to 'plugins/sudoers/iolog_path_escapes.c')
| -rw-r--r-- | plugins/sudoers/iolog_path_escapes.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/plugins/sudoers/iolog_path_escapes.c b/plugins/sudoers/iolog_path_escapes.c new file mode 100644 index 0000000..d234c55 --- /dev/null +++ b/plugins/sudoers/iolog_path_escapes.c @@ -0,0 +1,170 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 2011-2015 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 + */ + +#include <config.h> + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <pwd.h> +#include <grp.h> +#include <unistd.h> + +#include <sudoers.h> +#include <sudo_iolog.h> + +/* + * Like strlcpy(3) but replaces '/' with '_'. + */ +static size_t +strlcpy_no_slash(char *dst, const char *src, size_t size) +{ + size_t len = 0; + char ch; + debug_decl(strlcpy_no_slash, SUDOERS_DEBUG_UTIL); + + while ((ch = *src++) != '\0') { + if (size > 1) { + /* Replace '/' with '_' */ + if (ch == '/') + ch = '_'; + *dst++ = ch; + size--; + } + len++; + } + if (size > 0) + *dst = '\0'; + + debug_return_size_t(len); +} + +static size_t +fill_seq(char *str, size_t strsize, void *v) +{ +#ifdef SUDOERS_NO_SEQ + debug_decl(fill_seq, SUDOERS_DEBUG_UTIL); + debug_return_size_t(strlcpy(str, "%{seq}", strsize)); +#else + struct sudoers_context *ctx = v; + static char sessid[7]; + int len; + debug_decl(fill_seq, SUDOERS_DEBUG_UTIL); + + if (sessid[0] == '\0') { + if (!iolog_nextid(ctx->iolog_dir, sessid)) + debug_return_size_t((size_t)-1); + } + + /* Path is of the form /var/log/sudo-io/00/00/01. */ + len = snprintf(str, strsize, "%c%c/%c%c/%c%c", sessid[0], + sessid[1], sessid[2], sessid[3], sessid[4], sessid[5]); + if (len < 0) + debug_return_size_t(strsize); /* handle non-standard snprintf() */ + debug_return_size_t((size_t)len); +#endif /* SUDOERS_NO_SEQ */ +} + +static size_t +fill_user(char *str, size_t strsize, void *v) +{ + struct sudoers_context *ctx = v; + debug_decl(fill_user, SUDOERS_DEBUG_UTIL); + debug_return_size_t(strlcpy_no_slash(str, ctx->user.name, strsize)); +} + +static size_t +fill_group(char *str, size_t strsize, void *v) +{ + struct sudoers_context *ctx = v; + struct group *grp; + size_t len; + debug_decl(fill_group, SUDOERS_DEBUG_UTIL); + + if ((grp = sudo_getgrgid(ctx->user.gid)) != NULL) { + len = strlcpy_no_slash(str, grp->gr_name, strsize); + sudo_gr_delref(grp); + } else { + len = (size_t)snprintf(str, strsize, "#%u", (unsigned int)ctx->user.gid); + } + debug_return_size_t(len); +} + +static size_t +fill_runas_user(char *str, size_t strsize, void *v) +{ + struct sudoers_context *ctx = v; + debug_decl(fill_runas_user, SUDOERS_DEBUG_UTIL); + debug_return_size_t(strlcpy_no_slash(str, ctx->runas.pw->pw_name, strsize)); +} + +static size_t +fill_runas_group(char *str, size_t strsize, void *v) +{ + struct sudoers_context *ctx = v; + struct group *grp; + size_t len; + debug_decl(fill_runas_group, SUDOERS_DEBUG_UTIL); + + if (ctx->runas.gr != NULL) { + len = strlcpy_no_slash(str, ctx->runas.gr->gr_name, strsize); + } else { + if ((grp = sudo_getgrgid(ctx->runas.pw->pw_gid)) != NULL) { + len = strlcpy_no_slash(str, grp->gr_name, strsize); + sudo_gr_delref(grp); + } else { + len = (size_t)snprintf(str, strsize, "#%u", + (unsigned int)ctx->runas.pw->pw_gid); + } + } + debug_return_size_t(len); +} + +static size_t +fill_hostname(char *str, size_t strsize, void *v) +{ + struct sudoers_context *ctx = v; + debug_decl(fill_hostname, SUDOERS_DEBUG_UTIL); + debug_return_size_t(strlcpy_no_slash(str, ctx->user.shost, strsize)); +} + +static size_t +fill_command(char *str, size_t strsize, void *v) +{ + struct sudoers_context *ctx = v; + debug_decl(fill_command, SUDOERS_DEBUG_UTIL); + debug_return_size_t(strlcpy_no_slash(str, ctx->user.cmnd_base, strsize)); +} + +/* Note: "seq" must be first in the list. */ +static const struct iolog_path_escape path_escapes[] = { + { "seq", fill_seq }, + { "user", fill_user }, + { "group", fill_group }, + { "runas_user", fill_runas_user }, + { "runas_group", fill_runas_group }, + { "hostname", fill_hostname }, + { "command", fill_command }, + { NULL, NULL } +}; +const struct iolog_path_escape *sudoers_iolog_path_escapes = path_escapes; |