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https://github.com/freebsd/freebsd-src
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With asbestos longjohns on, integrate most of the checks normally done by
login(1) (password & account expiry, hosts.access etc.) into pam_unix(8). Sponsored by: DARPA, NAI Labs
This commit is contained in:
Dag-Erling Smørgrav
parent
86f01a8b27
commit
e9cc7b1d92
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=89993
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@ -1,6 +1,13 @@
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/*-
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* Copyright 1998 Juniper Networks, Inc.
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* All rights reserved.
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* Copyright (c) 2002 Networks Associates Technologies, Inc.
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* All rights reserved.
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*
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* Portions of this software was developed for the FreeBSD Project by
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* ThinkSec AS and NAI Labs, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
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* ("CBOSS"), as part of the DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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@ -10,6 +17,9 @@
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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@ -27,15 +37,21 @@
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#ifdef YP
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#include <rpc/rpc.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.h>
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#include <rpcsvc/yppasswd.h>
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#endif
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#include <login_cap.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <stdlib.h>
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#include <string.h>
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@ -68,7 +84,12 @@ __FBSDID("$FreeBSD$");
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#define DEFAULT_WARN (2L * 7L * 86400L) /* Two weeks */
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#define MAX_TRIES 3
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enum { PAM_OPT_AUTH_AS_SELF=PAM_OPT_STD_MAX, PAM_OPT_NULLOK, PAM_OPT_LOCAL_PASS, PAM_OPT_NIS_PASS };
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enum {
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PAM_OPT_AUTH_AS_SELF = PAM_OPT_STD_MAX,
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PAM_OPT_NULLOK,
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PAM_OPT_LOCAL_PASS,
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PAM_OPT_NIS_PASS
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};
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static struct opttab other_options[] = {
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{ "auth_as_self", PAM_OPT_AUTH_AS_SELF },
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@ -198,13 +219,15 @@ pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char **argv)
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PAM_EXTERN int
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pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv)
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{
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struct addrinfo hints, *res;
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struct options options;
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struct passwd *pw;
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struct passwd *pwd;
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struct timeval tp;
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login_cap_t *lc;
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time_t warntime;
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int retval;
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const char *user;
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const char *rhost, *tty, *user;
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char rhostip[MAXHOSTNAMELEN];
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char buf[128];
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pam_std_option(&options, other_options, argc, argv);
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@ -212,53 +235,100 @@ pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv)
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PAM_LOG("Options processed");
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retval = pam_get_item(pamh, PAM_USER, (const void **)&user);
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if (retval != PAM_SUCCESS || user == NULL)
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/* some implementations return PAM_SUCCESS here */
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PAM_RETURN(PAM_USER_UNKNOWN);
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if (retval != PAM_SUCCESS)
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PAM_RETURN(retval);
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pw = getpwnam(user);
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if (pw == NULL)
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PAM_RETURN(PAM_USER_UNKNOWN);
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if (user == NULL || (pwd = getpwnam(user)) == NULL)
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PAM_RETURN(PAM_SERVICE_ERR);
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PAM_LOG("Got user: %s", user);
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retval = PAM_SUCCESS;
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lc = login_getpwclass(pw);
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retval = pam_get_item(pamh, PAM_RHOST, (const void **)&rhost);
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if (retval != PAM_SUCCESS)
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PAM_RETURN(retval);
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if (pw->pw_change || pw->pw_expire)
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gettimeofday(&tp, NULL);
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retval = pam_get_item(pamh, PAM_TTY, (const void **)&tty);
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if (retval != PAM_SUCCESS)
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PAM_RETURN(retval);
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warntime = login_getcaptime(lc, "warnpassword", DEFAULT_WARN,
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DEFAULT_WARN);
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if (*pwd->pw_passwd == '\0' &&
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(flags & PAM_DISALLOW_NULL_AUTHTOK) != 0)
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return (PAM_NEW_AUTHTOK_REQD);
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lc = login_getpwclass(pwd);
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if (lc == NULL) {
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PAM_LOG("Unable to get login class for user %s", user);
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return (PAM_SERVICE_ERR);
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}
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PAM_LOG("Got login_cap");
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if (pw->pw_change) {
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if (tp.tv_sec >= pw->pw_change)
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/* some implementations return PAM_AUTHTOK_EXPIRED */
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retval = PAM_NEW_AUTHTOK_REQD;
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else if (pw->pw_change - tp.tv_sec < warntime) {
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snprintf(buf, sizeof(buf),
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"Warning: your password expires on %s",
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ctime(&pw->pw_change));
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pam_prompt(pamh, PAM_ERROR_MSG, buf, NULL);
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}
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}
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if (pwd->pw_change || pwd->pw_expire)
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gettimeofday(&tp, NULL);
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warntime = login_getcaptime(lc, "warnexpire", DEFAULT_WARN,
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DEFAULT_WARN);
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if (pw->pw_expire) {
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if (tp.tv_sec >= pw->pw_expire)
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retval = PAM_ACCT_EXPIRED;
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else if (pw->pw_expire - tp.tv_sec < warntime) {
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/*
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* Check pw_expire before pw_change - no point in letting the
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* user change the password on an expired account.
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*/
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if (pwd->pw_expire) {
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warntime = login_getcaptime(lc, "warnexpire",
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DEFAULT_WARN, DEFAULT_WARN);
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if (tp.tv_sec >= pwd->pw_expire) {
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login_close(lc);
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PAM_RETURN(PAM_ACCT_EXPIRED);
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} else if (pwd->pw_expire - tp.tv_sec < warntime &&
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(flags & PAM_SILENT) == 0) {
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snprintf(buf, sizeof(buf),
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"Warning: your account expires on %s",
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ctime(&pw->pw_expire));
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ctime(&pwd->pw_expire));
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pam_prompt(pamh, PAM_ERROR_MSG, buf, NULL);
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}
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}
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retval = PAM_SUCCESS;
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if (pwd->pw_change) {
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warntime = login_getcaptime(lc, "warnpassword",
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DEFAULT_WARN, DEFAULT_WARN);
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if (tp.tv_sec >= pwd->pw_change) {
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retval = PAM_NEW_AUTHTOK_REQD;
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} else if (pwd->pw_change - tp.tv_sec < warntime &&
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(flags & PAM_SILENT) == 0) {
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snprintf(buf, sizeof(buf),
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"Warning: your password expires on %s",
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ctime(&pwd->pw_change));
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pam_prompt(pamh, PAM_ERROR_MSG, buf, NULL);
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}
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}
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/*
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* From here on, we must leave retval untouched (unless we
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* know we're going to fail), because we need to remember
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* whether we're supposed to return PAM_SUCCESS or
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* PAM_NEW_AUTHTOK_REQD.
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*/
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if (rhost) {
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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if (getaddrinfo(rhost, NULL, &hints, &res) == 0) {
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getnameinfo(res->ai_addr, res->ai_addrlen,
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rhostip, sizeof(rhostip), NULL, 0,
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NI_NUMERICHOST|NI_WITHSCOPEID);
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}
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if (res != NULL)
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freeaddrinfo(res);
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}
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/*
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* Check host / tty / time-of-day restrictions
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*/
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if (!auth_hostok(lc, rhost, rhostip) ||
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!auth_ttyok(lc, tty) ||
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!auth_timeok(lc, time(NULL)))
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retval = PAM_AUTH_ERR;
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login_close(lc);
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PAM_RETURN(retval);
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