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/*
* 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 * restrict dst, const char * restrict 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 * restrict str, size_t strsize, void * restrict 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 * restrict str, size_t strsize, void * restrict 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 * restrict str, size_t strsize, void * restrict 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 * restrict str, size_t strsize, void * restrict 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 * restrict str, size_t strsize, void * restrict 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 * restrict str, size_t strsize, void * restrict 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 * restrict str, size_t strsize, void * restrict 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;
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