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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2004-2005, 2007-2021 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 <time.h>
#include "sudoers.h"
#include "sudo_lbuf.h"
#include <gram.h>
/*
* Write the contents of a struct member to the lbuf.
* If alias_type is not UNSPEC, expand aliases using that type with
* the specified separator (which must not be NULL in the UNSPEC case).
*/
static bool
sudoers_format_member_int(struct sudo_lbuf *lbuf,
struct sudoers_parse_tree *parse_tree, char *name, int type, bool negated,
const char *separator, int alias_type)
{
struct alias *a;
struct member *m;
struct sudo_command *c;
struct command_digest *digest;
debug_decl(sudoers_format_member_int, SUDOERS_DEBUG_UTIL);
switch (type) {
case MYSELF:
sudo_lbuf_append(lbuf, "%s%s", negated ? "!" : "",
list_pw ? list_pw->pw_name : (user_name ? user_name : ""));
break;
case ALL:
if (name == NULL) {
sudo_lbuf_append(lbuf, "%sALL", negated ? "!" : "");
break;
}
FALLTHROUGH;
case COMMAND:
c = (struct sudo_command *) name;
TAILQ_FOREACH(digest, &c->digests, entries) {
sudo_lbuf_append(lbuf, "%s:%s%s ",
digest_type_to_name(digest->digest_type),
digest->digest_str, TAILQ_NEXT(digest, entries) ? "," : "");
}
if (negated)
sudo_lbuf_append(lbuf, "!");
if (c->cmnd == NULL || c->cmnd[0] == '^') {
/* No additional quoting of characters inside a regex. */
sudo_lbuf_append(lbuf, "%s", c->cmnd ? c->cmnd : "ALL");
} else {
sudo_lbuf_append_quoted(lbuf, SUDOERS_QUOTED_CMD, "%s",
c->cmnd);
}
if (c->args != NULL) {
sudo_lbuf_append(lbuf, " ");
if (c->args[0] == '^') {
/* No additional quoting of characters inside a regex. */
sudo_lbuf_append(lbuf, "%s", c->args);
} else {
sudo_lbuf_append_quoted(lbuf, SUDOERS_QUOTED_ARG, "%s",
c->args);
}
}
break;
case USERGROUP:
/* Special case for %#gid, %:non-unix-group, %:#non-unix-gid */
if (strpbrk(name, " \t") == NULL) {
if (*++name == ':') {
name++;
sudo_lbuf_append(lbuf, "%s", "%:");
} else {
sudo_lbuf_append(lbuf, "%s", "%");
}
}
goto print_word;
case ALIAS:
if (alias_type != UNSPEC) {
if ((a = alias_get(parse_tree, name, alias_type)) != NULL) {
TAILQ_FOREACH(m, &a->members, entries) {
if (m != TAILQ_FIRST(&a->members))
sudo_lbuf_append(lbuf, "%s", separator);
sudoers_format_member_int(lbuf, parse_tree, m->name,
m->type, negated ? !m->negated : m->negated,
separator, alias_type);
}
alias_put(a);
break;
}
}
FALLTHROUGH;
default:
print_word:
/* Do not quote UID/GID, all others get quoted. */
if (name[0] == '#' &&
name[strspn(name + 1, "0123456789") + 1] == '\0') {
sudo_lbuf_append(lbuf, "%s%s", negated ? "!" : "", name);
} else {
if (strpbrk(name, " \t") != NULL) {
sudo_lbuf_append(lbuf, "%s\"", negated ? "!" : "");
sudo_lbuf_append_quoted(lbuf, "\"", "%s", name);
sudo_lbuf_append(lbuf, "\"");
} else {
sudo_lbuf_append_quoted(lbuf, SUDOERS_QUOTED, "%s%s",
negated ? "!" : "", name);
}
}
break;
}
debug_return_bool(!sudo_lbuf_error(lbuf));
}
bool
sudoers_format_member(struct sudo_lbuf *lbuf,
struct sudoers_parse_tree *parse_tree, struct member *m,
const char *separator, int alias_type)
{
return sudoers_format_member_int(lbuf, parse_tree, m->name, m->type,
m->negated, separator, alias_type);
}
/*
* Store a defaults entry as a command tag.
*/
bool
sudoers_defaults_to_tags(const char *var, const char *val, int op,
struct cmndtag *tags)
{
bool ret = true;
debug_decl(sudoers_defaults_to_tags, SUDOERS_DEBUG_UTIL);
if (op == true || op == false) {
if (strcmp(var, "authenticate") == 0) {
tags->nopasswd = op == false;
} else if (strcmp(var, "sudoedit_follow") == 0) {
tags->follow = op == true;
} else if (strcmp(var, "log_input") == 0) {
tags->log_input = op == true;
} else if (strcmp(var, "log_output") == 0) {
tags->log_output = op == true;
} else if (strcmp(var, "noexec") == 0) {
tags->noexec = op == true;
} else if (strcmp(var, "intercept") == 0) {
tags->intercept = op == true;
} else if (strcmp(var, "setenv") == 0) {
tags->setenv = op == true;
} else if (strcmp(var, "mail_all_cmnds") == 0 ||
strcmp(var, "mail_always") == 0 ||
strcmp(var, "mail_no_perms") == 0) {
tags->send_mail = op == true;
} else {
ret = false;
}
} else {
ret = false;
}
debug_return_bool(ret);
}
/*
* Convert a defaults list to command tags.
*/
bool
sudoers_defaults_list_to_tags(struct defaults_list *defs, struct cmndtag *tags)
{
bool ret = true;
struct defaults *d;
debug_decl(sudoers_defaults_list_to_tags, SUDOERS_DEBUG_UTIL);
TAGS_INIT(tags);
if (defs != NULL) {
TAILQ_FOREACH(d, defs, entries) {
if (!sudoers_defaults_to_tags(d->var, d->val, d->op, tags)) {
if (d->val != NULL) {
sudo_debug_printf(SUDO_DEBUG_WARN,
"unable to convert defaults to tag: %s%s%s", d->var,
d->op == '+' ? "+=" : d->op == '-' ? "-=" : "=", d->val);
} else {
sudo_debug_printf(SUDO_DEBUG_WARN,
"unable to convert defaults to tag: %s%s%s",
d->op == false ? "!" : "", d->var, "");
}
ret = false;
}
}
}
debug_return_bool(ret);
}
#define FIELD_CHANGED(ocs, ncs, fld) \
((ocs) == NULL || (ncs)->fld != (ocs)->fld)
#define TAG_CHANGED(ocs, ncs, t, tt) \
(TAG_SET((t).tt) && FIELD_CHANGED(ocs, ncs, tags.tt))
/*
* Write a cmndspec to lbuf in sudoers format.
*/
bool
sudoers_format_cmndspec(struct sudo_lbuf *lbuf,
struct sudoers_parse_tree *parse_tree, struct cmndspec *cs,
struct cmndspec *prev_cs, struct cmndtag tags, bool expand_aliases)
{
debug_decl(sudoers_format_cmndspec, SUDOERS_DEBUG_UTIL);
/* Merge privilege-level tags with cmndspec tags. */
TAGS_MERGE(tags, cs->tags);
#ifdef HAVE_PRIV_SET
if (cs->privs != NULL && FIELD_CHANGED(prev_cs, cs, privs))
sudo_lbuf_append(lbuf, "PRIVS=\"%s\" ", cs->privs);
if (cs->limitprivs != NULL && FIELD_CHANGED(prev_cs, cs, limitprivs))
sudo_lbuf_append(lbuf, "LIMITPRIVS=\"%s\" ", cs->limitprivs);
#endif /* HAVE_PRIV_SET */
#ifdef HAVE_SELINUX
if (cs->role != NULL && FIELD_CHANGED(prev_cs, cs, role))
sudo_lbuf_append(lbuf, "ROLE=%s ", cs->role);
if (cs->type != NULL && FIELD_CHANGED(prev_cs, cs, type))
sudo_lbuf_append(lbuf, "TYPE=%s ", cs->type);
#endif /* HAVE_SELINUX */
#ifdef HAVE_APPARMOR
if (cs->apparmor_profile != NULL && FIELD_CHANGED(prev_cs, cs, apparmor_profile))
sudo_lbuf_append(lbuf, "APPARMOR_PROFILE=%s ", cs->apparmor_profile);
#endif /* HAVE_APPARMOR */
if (cs->runchroot != NULL && FIELD_CHANGED(prev_cs, cs, runchroot))
sudo_lbuf_append(lbuf, "CHROOT=%s ", cs->runchroot);
if (cs->runcwd != NULL && FIELD_CHANGED(prev_cs, cs, runcwd))
sudo_lbuf_append(lbuf, "CWD=%s ", cs->runcwd);
if (cs->timeout > 0 && FIELD_CHANGED(prev_cs, cs, timeout)) {
char numbuf[(((sizeof(int) * 8) + 2) / 3) + 2];
(void)snprintf(numbuf, sizeof(numbuf), "%d", cs->timeout);
sudo_lbuf_append(lbuf, "TIMEOUT=%s ", numbuf);
}
if (cs->notbefore != UNSPEC && FIELD_CHANGED(prev_cs, cs, notbefore)) {
char buf[sizeof("CCYYMMDDHHMMSSZ")] = "";
struct tm gmt;
if (gmtime_r(&cs->notbefore, &gmt) != NULL) {
int len = strftime(buf, sizeof(buf), "%Y%m%d%H%M%SZ", &gmt);
if (len != 0 && buf[sizeof(buf) - 1] == '\0')
sudo_lbuf_append(lbuf, "NOTBEFORE=%s ", buf);
}
}
if (cs->notafter != UNSPEC && FIELD_CHANGED(prev_cs, cs, notafter)) {
char buf[sizeof("CCYYMMDDHHMMSSZ")] = "";
struct tm gmt;
if (gmtime_r(&cs->notafter, &gmt) != NULL) {
int len = strftime(buf, sizeof(buf), "%Y%m%d%H%M%SZ", &gmt);
if (len != 0 && buf[sizeof(buf) - 1] == '\0')
sudo_lbuf_append(lbuf, "NOTAFTER=%s ", buf);
}
}
if (TAG_CHANGED(prev_cs, cs, tags, setenv))
sudo_lbuf_append(lbuf, tags.setenv ? "SETENV: " : "NOSETENV: ");
if (TAG_CHANGED(prev_cs, cs, tags, intercept))
sudo_lbuf_append(lbuf, tags.intercept ? "INTERCEPT: " : "NOINTERCEPT: ");
if (TAG_CHANGED(prev_cs, cs, tags, noexec))
sudo_lbuf_append(lbuf, tags.noexec ? "NOEXEC: " : "EXEC: ");
if (TAG_CHANGED(prev_cs, cs, tags, nopasswd))
sudo_lbuf_append(lbuf, tags.nopasswd ? "NOPASSWD: " : "PASSWD: ");
if (TAG_CHANGED(prev_cs, cs, tags, log_input))
sudo_lbuf_append(lbuf, tags.log_input ? "LOG_INPUT: " : "NOLOG_INPUT: ");
if (TAG_CHANGED(prev_cs, cs, tags, log_output))
sudo_lbuf_append(lbuf, tags.log_output ? "LOG_OUTPUT: " : "NOLOG_OUTPUT: ");
if (TAG_CHANGED(prev_cs, cs, tags, send_mail))
sudo_lbuf_append(lbuf, tags.send_mail ? "MAIL: " : "NOMAIL: ");
if (TAG_CHANGED(prev_cs, cs, tags, follow))
sudo_lbuf_append(lbuf, tags.follow ? "FOLLOW: " : "NOFOLLOW: ");
sudoers_format_member(lbuf, parse_tree, cs->cmnd, ", ",
expand_aliases ? CMNDALIAS : UNSPEC);
debug_return_bool(!sudo_lbuf_error(lbuf));
}
/*
* Format and append a defaults entry to the specified lbuf.
*/
bool
sudoers_format_default(struct sudo_lbuf *lbuf, struct defaults *d)
{
debug_decl(sudoers_format_default, SUDOERS_DEBUG_UTIL);
if (d->val != NULL) {
sudo_lbuf_append(lbuf, "%s%s", d->var,
d->op == '+' ? "+=" : d->op == '-' ? "-=" : "=");
if (strpbrk(d->val, " \t") != NULL) {
sudo_lbuf_append(lbuf, "\"");
sudo_lbuf_append_quoted(lbuf, "\"", "%s", d->val);
sudo_lbuf_append(lbuf, "\"");
} else
sudo_lbuf_append_quoted(lbuf, SUDOERS_QUOTED, "%s", d->val);
} else {
sudo_lbuf_append(lbuf, "%s%s", d->op == false ? "!" : "", d->var);
}
debug_return_bool(!sudo_lbuf_error(lbuf));
}
|
