116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2019-2020, 2023 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <pwd.h>
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#include "sudoers.h"
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/*
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* Returns true if the specified shell is allowed by /etc/shells, else false.
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*/
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bool
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check_user_shell(const struct passwd *pw)
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{
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const char *shell;
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debug_decl(check_user_shell, SUDOERS_DEBUG_AUTH);
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if (!def_runas_check_shell)
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debug_return_bool(true);
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sudo_debug_printf(SUDO_DEBUG_INFO,
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"%s: checking /etc/shells for %s", __func__, pw->pw_shell);
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setusershell();
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while ((shell = getusershell()) != NULL) {
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if (strcmp(shell, pw->pw_shell) == 0)
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debug_return_bool(true);
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}
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endusershell();
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debug_return_bool(false);
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}
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/*
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* Check whether runas_ctx.chroot matches def_runchroot.
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* Returns true if matched, false if not matched and -1 on error.
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*/
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int
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check_user_runchroot(void)
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{
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debug_decl(check_user_runchroot, SUDOERS_DEBUG_AUTH);
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if (runas_ctx.chroot == NULL)
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debug_return_bool(true);
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sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
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"def_runchroot %s, runas_ctx.chroot %s",
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def_runchroot ? def_runchroot : "none",
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runas_ctx.chroot ? runas_ctx.chroot : "none");
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/* User may only specify a root dir if runchroot is "*" */
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if (def_runchroot == NULL || strcmp(def_runchroot, "*") != 0)
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debug_return_bool(false);
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free(def_runchroot);
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if ((def_runchroot = strdup(runas_ctx.chroot)) == NULL) {
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sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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debug_return_int(-1);
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}
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debug_return_bool(true);
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}
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/*
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* Check whether runas_ctx.cwd matches def_runcwd.
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* Returns true if matched, false if not matched and -1 on error.
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*/
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int
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check_user_runcwd(void)
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{
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debug_decl(check_user_runcwd, SUDOERS_DEBUG_AUTH);
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if (runas_ctx.cwd == NULL)
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debug_return_bool(true);
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sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
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"def_runcwd %s, runas_ctx.cwd %s",
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def_runcwd ? def_runcwd : "none",
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runas_ctx.cwd ? runas_ctx.cwd : "none");
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/* User may only specify a cwd if runcwd is "*" */
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if (def_runcwd == NULL || strcmp(def_runcwd, "*") != 0)
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debug_return_bool(false);
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free(def_runcwd);
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if ((def_runcwd = strdup(runas_ctx.cwd)) == NULL) {
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sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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debug_return_int(-1);
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}
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debug_return_bool(true);
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}
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