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Diffstat (limited to 'plugins/sudoers/auth/dce.c')
| -rw-r--r-- | plugins/sudoers/auth/dce.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/plugins/sudoers/auth/dce.c b/plugins/sudoers/auth/dce.c new file mode 100644 index 0000000..bbee842 --- /dev/null +++ b/plugins/sudoers/auth/dce.c @@ -0,0 +1,201 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 1996, 1998-2005, 2010-2012, 2014-2015 + * 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. + * + * Sponsored in part by the Defense Advanced Research Projects + * Agency (DARPA) and Air Force Research Laboratory, Air Force + * Materiel Command, USAF, under agreement number F39502-99-1-0512. + */ + +/* + * 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 + */ +/* + * The code below basically comes from the examples supplied on + * the OSF DCE 1.0.3 manpages for the sec_login routines, with + * enough additional polishing to make the routine work with the + * rest of sudo. + * + * This code is known to work on HP 700 and 800 series systems + * running HP-UX 9.X and 10.X, with either HP's version 1.2.1 of DCE. + * (aka, OSF DCE 1.0.3) or with HP's version 1.4 of DCE (aka, OSF + * DCE 1.1). + */ + +#include <config.h> + +#ifdef HAVE_DCE + +#include <sys/types.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <pwd.h> + +#include <dce/rpc.h> +#include <dce/sec_login.h> +#include <dce/dce_error.h> /* required to call dce_error_inq_text routine */ + +#include "sudoers.h" +#include "sudo_auth.h" +#include "check.h" + +static int check_dce_status(error_status_t, char *); + +int +sudo_dce_verify(struct passwd *pw, const char *plain_pw, sudo_auth *auth, struct sudo_conv_callback *callback) +{ + struct passwd temp_pw; + sec_passwd_rec_t password_rec; + sec_login_handle_t login_context; + boolean32 reset_passwd; + sec_login_auth_src_t auth_src; + error_status_t status; + debug_decl(sudo_dce_verify, SUDOERS_DEBUG_AUTH); + + if (IS_NONINTERACTIVE(auth)) + debug_return_int(AUTH_NONINTERACTIVE); + + /* Display lecture if needed and we haven't already done so. */ + display_lecture(callback); + + /* + * Create the local context of the DCE principal necessary + * to perform authenticated network operations. The network + * identity set up by this operation cannot be used until it + * is validated via sec_login_validate_identity(). + */ + if (sec_login_setup_identity((unsigned_char_p_t) pw->pw_name, + sec_login_no_flags, &login_context, &status)) { + + if (check_dce_status(status, "sec_login_setup_identity(1):")) + debug_return_int(AUTH_FAILURE); + + password_rec.key.key_type = sec_passwd_plain; + password_rec.key.tagged_union.plain = (idl_char *) plain_pw; + password_rec.pepper = NULL; + password_rec.version_number = sec_passwd_c_version_none; + + /* Validate the login context with the password */ + if (sec_login_validate_identity(login_context, &password_rec, + &reset_passwd, &auth_src, &status)) { + + if (check_dce_status(status, "sec_login_validate_identity(1):")) + debug_return_int(AUTH_FAILURE); + + /* + * Certify that the DCE Security Server used to set + * up and validate a login context is legitimate. Makes + * sure that we didn't get spoofed by another DCE server. + */ + if (!sec_login_certify_identity(login_context, &status)) { + sudo_printf(SUDO_CONV_ERROR_MSG|SUDO_CONV_PREFER_TTY, + "Whoa! Bogus authentication server!\n"); + (void) check_dce_status(status,"sec_login_certify_identity(1):"); + debug_return_int(AUTH_FAILURE); + } + if (check_dce_status(status, "sec_login_certify_identity(2):")) + debug_return_int(AUTH_FAILURE); + + /* + * Sets the network credentials to those specified + * by the now validated login context. + */ + sec_login_set_context(login_context, &status); + if (check_dce_status(status, "sec_login_set_context:")) + debug_return_int(AUTH_FAILURE); + + /* + * Oops, your credentials were no good. Possibly + * caused by clock times out of adjustment between + * DCE client and DCE security server... + */ + if (auth_src != sec_login_auth_src_network) { + sudo_printf(SUDO_CONV_ERROR_MSG|SUDO_CONV_PREFER_TTY, + "You have no network credentials.\n"); + debug_return_int(AUTH_FAILURE); + } + /* Check if the password has aged and is thus no good */ + if (reset_passwd) { + sudo_printf(SUDO_CONV_ERROR_MSG|SUDO_CONV_PREFER_TTY, + "Your DCE password needs resetting.\n"); + debug_return_int(AUTH_FAILURE); + } + + /* + * We should be a valid user by this point. Pull the + * user's password structure from the DCE security + * server just to make sure. If we get it with no + * problems, then we really are legitimate... + */ + sec_login_get_pwent(login_context, (sec_login_passwd_t) &temp_pw, + &status); + if (check_dce_status(status, "sec_login_get_pwent:")) + debug_return_int(AUTH_FAILURE); + + /* + * If we get to here, then the pwent above properly fetched + * the password structure from the DCE registry, so the user + * must be valid. We don't really care what the user's + * registry password is, just that the user could be + * validated. In fact, if we tried to compare the local + * password to the DCE entry at this point, the operation + * would fail if the hidden password feature is turned on, + * because the password field would contain an asterisk. + * Also go ahead and destroy the user's DCE login context + * before we leave here (and don't bother checking the + * status), in order to clean up credentials files in + * /opt/dcelocal/var/security/creds. By doing this, we are + * assuming that the user will not need DCE authentication + * later in the program, only local authentication. If this + * is not true, then the login_context will have to be + * returned to the calling program, and the context purged + * somewhere later in the program. + */ + sec_login_purge_context(&login_context, &status); + debug_return_int(AUTH_SUCCESS); + } else { + if(check_dce_status(status, "sec_login_validate_identity(2):")) + debug_return_int(AUTH_FAILURE); + sec_login_purge_context(&login_context, &status); + if(check_dce_status(status, "sec_login_purge_context:")) + debug_return_int(AUTH_FAILURE); + } + } + (void) check_dce_status(status, "sec_login_setup_identity(2):"); + debug_return_int(AUTH_FAILURE); +} + +/* Returns 0 for DCE "ok" status, 1 otherwise */ +static int +check_dce_status(error_status_t input_status, char *comment) +{ + int error_stat; + unsigned char error_string[dce_c_error_string_len]; + debug_decl(check_dce_status, SUDOERS_DEBUG_AUTH); + + if (input_status == rpc_s_ok) + debug_return_int(0); + dce_error_inq_text(input_status, error_string, &error_stat); + sudo_printf(SUDO_CONV_ERROR_MSG|SUDO_CONV_PREFER_TTY, + "%s %s\n", comment, error_string); + debug_return_int(1); +} + +#endif /* HAVE_DCE */ |