From de848d9e9146434817c65d74d1d0313e9d729462 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 14:01:37 +0200 Subject: Adding upstream version 1.4.0. Signed-off-by: Daniel Baumann --- modules/pam_localuser/pam_localuser.c | 208 ++++++++++++++++++++++++++++++++++ 1 file changed, 208 insertions(+) create mode 100644 modules/pam_localuser/pam_localuser.c (limited to 'modules/pam_localuser/pam_localuser.c') diff --git a/modules/pam_localuser/pam_localuser.c b/modules/pam_localuser/pam_localuser.c new file mode 100644 index 0000000..cb50752 --- /dev/null +++ b/modules/pam_localuser/pam_localuser.c @@ -0,0 +1,208 @@ +/* + * pam_localuser module + * + * Copyright 2001, 2004 Red Hat, Inc. + * Copyright (c) 2020 Dmitry V. Levin + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "config.h" + +#include +#include +#include +#include +#include + +#include +#include +#include "pam_inline.h" + +static int +check_user_in_passwd(pam_handle_t *pamh, const char *user_name, + const char *file_name) +{ + int rc; + size_t user_len; + FILE *fp; + char line[BUFSIZ]; + + /* Validate the user name. */ + if ((user_len = strlen(user_name)) == 0) { + pam_syslog(pamh, LOG_NOTICE, "user name is not valid"); + return PAM_SERVICE_ERR; + } + + if (user_len > sizeof(line) - sizeof(":")) { + pam_syslog(pamh, LOG_NOTICE, "user name is too long"); + return PAM_SERVICE_ERR; + } + + if (strchr(user_name, ':') != NULL) { + /* + * "root:x" is not a local user name even if the passwd file + * contains a line starting with "root:x:". + */ + return PAM_PERM_DENIED; + } + + /* Open the passwd file. */ + if (file_name == NULL) { + file_name = "/etc/passwd"; + } + if ((fp = fopen(file_name, "r")) == NULL) { + pam_syslog(pamh, LOG_ERR, "error opening %s: %m", file_name); + return PAM_SERVICE_ERR; + } + + /* + * Scan the file using fgets() instead of fgetpwent_r() because + * the latter is not flexible enough in handling long lines + * in passwd files. + */ + rc = PAM_PERM_DENIED; + while (fgets(line, sizeof(line), fp) != NULL) { + size_t line_len; + const char *str; + + /* + * Does this line start with the user name + * followed by a colon? + */ + if (strncmp(user_name, line, user_len) == 0 && + line[user_len] == ':') { + rc = PAM_SUCCESS; + break; + } + /* Has a newline been read? */ + line_len = strlen(line); + if (line_len < sizeof(line) - 1 || + line[line_len - 1] == '\n') { + /* Yes, continue with the next line. */ + continue; + } + + /* No, read till the end of this line first. */ + while ((str = fgets(line, sizeof(line), fp)) != NULL) { + line_len = strlen(line); + if (line_len == 0 || + line[line_len - 1] == '\n') { + break; + } + } + if (str == NULL) { + /* fgets returned NULL, we are done. */ + break; + } + /* Continue with the next line. */ + } + + fclose(fp); + return rc; +} + +int +pam_sm_authenticate(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int i; + int rc; + int debug = 0; + const char *file_name = NULL; + const char *user_name = NULL; + + /* Process arguments. */ + for (i = 0; i < argc; ++i) { + if (strcmp("debug", argv[i]) == 0) { + debug = 1; + } + } + for (i = 0; i < argc; ++i) { + const char *str; + + if (strcmp("debug", argv[i]) == 0) { + /* Already processed. */ + continue; + } + if ((str = pam_str_skip_prefix(argv[i], "file=")) != NULL) { + file_name = str; + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "set filename to %s", file_name); + } + } else { + pam_syslog(pamh, LOG_ERR, "unrecognized option: %s", + argv[i]); + } + } + + /* Obtain the user name. */ + if ((rc = pam_get_user(pamh, &user_name, NULL)) != PAM_SUCCESS) { + pam_syslog(pamh, LOG_NOTICE, "cannot determine user name: %s", + pam_strerror(pamh, rc)); + return rc == PAM_CONV_AGAIN ? PAM_INCOMPLETE : rc; + } + + return check_user_in_passwd(pamh, user_name, file_name); +} + +int +pam_sm_setcred(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +int +pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +int +pam_sm_open_session(pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +int +pam_sm_close_session(pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +int +pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} -- cgit v1.2.3