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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2004-2005, 2007-2021, 2023 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 <time.h>
#include <sudoers.h>
#include <sudo_lbuf.h>
#include <gram.h>
/*
* Write a privilege to lbuf in sudoers format.
*/
bool
sudoers_format_privilege(struct sudo_lbuf *lbuf,
const struct sudoers_parse_tree *parse_tree, const struct privilege *priv,
bool expand_aliases)
{
const struct cmndspec *cs, *prev_cs;
const struct member *m;
struct cmndtag tags;
debug_decl(sudoers_format_privilege, SUDOERS_DEBUG_UTIL);
/* Convert per-privilege defaults to tags. */
sudoers_defaults_list_to_tags(&priv->defaults, &tags);
/* Print hosts list. */
TAILQ_FOREACH(m, &priv->hostlist, entries) {
if (m != TAILQ_FIRST(&priv->hostlist))
sudo_lbuf_append(lbuf, ", ");
sudoers_format_member(lbuf, parse_tree, m, ", ",
expand_aliases ? HOSTALIAS : UNSPEC);
}
/* Print commands. */
sudo_lbuf_append(lbuf, " = ");
prev_cs = NULL;
TAILQ_FOREACH(cs, &priv->cmndlist, entries) {
if (prev_cs == NULL || RUNAS_CHANGED(cs, prev_cs)) {
if (cs != TAILQ_FIRST(&priv->cmndlist))
sudo_lbuf_append(lbuf, ", ");
if (cs->runasuserlist != NULL || cs->runasgrouplist != NULL)
sudo_lbuf_append(lbuf, "(");
if (cs->runasuserlist != NULL) {
TAILQ_FOREACH(m, cs->runasuserlist, entries) {
if (m != TAILQ_FIRST(cs->runasuserlist))
sudo_lbuf_append(lbuf, ", ");
sudoers_format_member(lbuf, parse_tree, m, ", ",
expand_aliases ? RUNASALIAS : UNSPEC);
}
}
if (cs->runasgrouplist != NULL) {
sudo_lbuf_append(lbuf, " : ");
TAILQ_FOREACH(m, cs->runasgrouplist, entries) {
if (m != TAILQ_FIRST(cs->runasgrouplist))
sudo_lbuf_append(lbuf, ", ");
sudoers_format_member(lbuf, parse_tree, m, ", ",
expand_aliases ? RUNASALIAS : UNSPEC);
}
}
if (cs->runasuserlist != NULL || cs->runasgrouplist != NULL)
sudo_lbuf_append(lbuf, ") ");
} else if (cs != TAILQ_FIRST(&priv->cmndlist)) {
sudo_lbuf_append(lbuf, ", ");
}
sudoers_format_cmndspec(lbuf, parse_tree, cs, prev_cs, tags,
expand_aliases);
prev_cs = cs;
}
debug_return_bool(!sudo_lbuf_error(lbuf));
}
/*
* Write a userspec to lbuf in sudoers format.
*/
bool
sudoers_format_userspec(struct sudo_lbuf *lbuf,
const struct sudoers_parse_tree *parse_tree,
const struct userspec *us, bool expand_aliases)
{
const struct sudoers_comment *comment;
const struct privilege *priv;
const struct member *m;
debug_decl(sudoers_format_userspec, SUDOERS_DEBUG_UTIL);
/* Print comments (if any). */
STAILQ_FOREACH(comment, &us->comments, entries) {
sudo_lbuf_append(lbuf, "# %s\n", comment->str);
}
/* Print users list. */
TAILQ_FOREACH(m, &us->users, entries) {
if (m != TAILQ_FIRST(&us->users))
sudo_lbuf_append(lbuf, ", ");
sudoers_format_member(lbuf, parse_tree, m, ", ",
expand_aliases ? USERALIAS : UNSPEC);
}
TAILQ_FOREACH(priv, &us->privileges, entries) {
if (priv != TAILQ_FIRST(&us->privileges))
sudo_lbuf_append(lbuf, " : ");
else
sudo_lbuf_append(lbuf, " ");
if (!sudoers_format_privilege(lbuf, parse_tree, priv, expand_aliases))
break;
}
sudo_lbuf_append(lbuf, "\n");
debug_return_bool(!sudo_lbuf_error(lbuf));
}
/*
* Write a userspec_list to lbuf in sudoers format.
*/
bool
sudoers_format_userspecs(struct sudo_lbuf *lbuf,
const struct sudoers_parse_tree *parse_tree, const char *separator,
bool expand_aliases, bool flush)
{
const struct userspec *us;
debug_decl(sudoers_format_userspecs, SUDOERS_DEBUG_UTIL);
TAILQ_FOREACH(us, &parse_tree->userspecs, entries) {
if (separator != NULL && us != TAILQ_FIRST(&parse_tree->userspecs))
sudo_lbuf_append(lbuf, "%s", separator);
if (!sudoers_format_userspec(lbuf, parse_tree, us, expand_aliases))
break;
sudo_lbuf_print(lbuf);
}
debug_return_bool(!sudo_lbuf_error(lbuf));
}
/*
* Format and append a defaults line to the specified lbuf.
* If next, is specified, it must point to the next defaults
* entry in the list; this is used to print multiple defaults
* entries with the same binding on a single line.
*/
bool
sudoers_format_default_line(struct sudo_lbuf *lbuf,
const struct sudoers_parse_tree *parse_tree, const struct defaults *d,
struct defaults **next, bool expand_aliases)
{
const struct member *m;
short alias_type;
debug_decl(sudoers_format_default_line, SUDOERS_DEBUG_UTIL);
/* Print Defaults type and binding (if present) */
switch (d->type) {
case DEFAULTS_HOST:
sudo_lbuf_append(lbuf, "Defaults@");
alias_type = expand_aliases ? HOSTALIAS : UNSPEC;
break;
case DEFAULTS_USER:
sudo_lbuf_append(lbuf, "Defaults:");
alias_type = expand_aliases ? USERALIAS : UNSPEC;
break;
case DEFAULTS_RUNAS:
sudo_lbuf_append(lbuf, "Defaults>");
alias_type = expand_aliases ? RUNASALIAS : UNSPEC;
break;
case DEFAULTS_CMND:
sudo_lbuf_append(lbuf, "Defaults!");
alias_type = expand_aliases ? CMNDALIAS : UNSPEC;
break;
default:
sudo_lbuf_append(lbuf, "Defaults");
alias_type = UNSPEC;
break;
}
TAILQ_FOREACH(m, &d->binding->members, entries) {
if (m != TAILQ_FIRST(&d->binding->members))
sudo_lbuf_append(lbuf, ", ");
sudoers_format_member(lbuf, parse_tree, m, ", ", alias_type);
}
sudo_lbuf_append(lbuf, " ");
sudoers_format_default(lbuf, d);
if (next != NULL) {
/* Merge Defaults with the same binding, there may be multiple. */
struct defaults *n;
while ((n = TAILQ_NEXT(d, entries)) && d->binding == n->binding) {
sudo_lbuf_append(lbuf, ", ");
sudoers_format_default(lbuf, n);
d = n;
}
*next = n;
}
sudo_lbuf_append(lbuf, "\n");
debug_return_bool(!sudo_lbuf_error(lbuf));
}
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