openbsd-compat/port-aix.c - platform/external/openssh - Gitiles

 /*
  *
  * Copyright (c) 2001 Gert Doering.  All rights reserved.
  * Copyright (c) 2003,2004,2005,2006 Darren Tucker.  All rights reserved.
  *
  * 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, this list of conditions and the following disclaimer.
  * 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.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 "includes.h"

 #include "xmalloc.h"
 #include "buffer.h"
 #include "key.h"
 #include "hostfile.h"
 #include "auth.h"
 #include "ssh.h"
 #include "log.h"

 #ifdef _AIX

 #include <errno.h>
 #if defined(HAVE_NETDB_H)
 # include <netdb.h>
 #endif
 #include <uinfo.h>
 #include <stdarg.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/socket.h>

 #ifdef WITH_AIXAUTHENTICATE
 # include <login.h>
 # include <userpw.h>
 # if defined(HAVE_SYS_AUDIT_H) && defined(AIX_LOGINFAILED_4ARG)
 #  include <sys/audit.h>
 # endif
 # include <usersec.h>
 #endif

 #include "port-aix.h"

 static char *lastlogin_msg = NULL;

 # ifdef HAVE_SETAUTHDB
 static char old_registry[REGISTRY_SIZE] = "";
 # endif

 /*
  * AIX has a "usrinfo" area where logname and other stuff is stored -
  * a few applications actually use this and die if it's not set
  *
  * NOTE: TTY= should be set, but since no one uses it and it's hard to
  * acquire due to privsep code.  We will just drop support.
  */
 void
 aix_usrinfo(struct passwd *pw)
 {
 	u_int i;
 	size_t len;
 	char *cp;

 	len = sizeof("LOGNAME= NAME= ") + (2 * strlen(pw->pw_name));
 	cp = xmalloc(len);

 	i = snprintf(cp, len, "LOGNAME=%s%cNAME=%s%c", pw->pw_name, '\0',
 	    pw->pw_name, '\0');
 	if (usrinfo(SETUINFO, cp, i) == -1)
 		fatal("Couldn't set usrinfo: %s", strerror(errno));
 	debug3("AIX/UsrInfo: set len %d", i);

 	xfree(cp);
 }

 # ifdef WITH_AIXAUTHENTICATE
 /*
  * Remove embedded newlines in string (if any).
  * Used before logging messages returned by AIX authentication functions
  * so the message is logged on one line.
  */
 void
 aix_remove_embedded_newlines(char *p)
 {
 	if (p == NULL)
 		return;

 	for (; *p; p++) {
 		if (*p == '\n')
 			*p = ' ';
 	}
 	/* Remove trailing whitespace */
 	if (*--p == ' ')
 		*p = '\0';
 }

 /*
  * Test specifically for the case where SYSTEM == NONE and AUTH1 contains
  * anything other than NONE or SYSTEM, which indicates that the admin has
  * configured the account for purely AUTH1-type authentication.
  *
  * Since authenticate() doesn't check AUTH1, and sshd can't sanely support
  * AUTH1 itself, in such a case authenticate() will allow access without
  * authentation, which is almost certainly not what the admin intends.
  *
  * (The native tools, eg login, will process the AUTH1 list in addition to
  * the SYSTEM list by using ckuserID(), however ckuserID() and AUTH1 methods
  * have been deprecated since AIX 4.2.x and would be very difficult for sshd
  * to support.
  *
  * Returns 0 if an unsupportable combination is found, 1 otherwise.
  */
 static int
 aix_valid_authentications(const char *user)
 {
 	char *auth1, *sys, *p;
 	int valid = 1;

 	if (getuserattr((char *)user, S_AUTHSYSTEM, &sys, SEC_CHAR) != 0) {
 		logit("Can't retrieve attribute SYSTEM for %s: %.100s",
 		    user, strerror(errno));
 		return 0;
 	}

 	debug3("AIX SYSTEM attribute %s", sys);
 	if (strcmp(sys, "NONE") != 0)
 		return 1;	/* not "NONE", so is OK */

 	if (getuserattr((char *)user, S_AUTH1, &auth1, SEC_LIST) != 0) {
 		logit("Can't retrieve attribute auth1 for %s: %.100s",
 		    user, strerror(errno));
 		return 0;
 	}

 	p = auth1;
 	/* A SEC_LIST is concatenated strings, ending with two NULs. */
 	while (p[0] != '\0' && p[1] != '\0') {
 		debug3("AIX auth1 attribute list member %s", p);
 		if (strcmp(p, "NONE") != 0 && strcmp(p, "SYSTEM")) {
 			logit("Account %s has unsupported auth1 value '%s'",
 			    user, p);
 			valid = 0;
 		}
 		p += strlen(p) + 1;
 	}

 	return (valid);
 }

 /*
  * Do authentication via AIX's authenticate routine.  We loop until the
  * reenter parameter is 0, but normally authenticate is called only once.
  *
  * Note: this function returns 1 on success, whereas AIX's authenticate()
  * returns 0.
  */
 int
 sys_auth_passwd(Authctxt *ctxt, const char *password)
 {
 	char *authmsg = NULL, *msg = NULL, *name = ctxt->pw->pw_name;
 	int authsuccess = 0, expired, reenter, result;

 	do {
 		result = authenticate((char *)name, (char *)password, &reenter,
 		    &authmsg);
 		aix_remove_embedded_newlines(authmsg);
 		debug3("AIX/authenticate result %d, authmsg %.100s", result,
 		    authmsg);
 	} while (reenter);

 	if (!aix_valid_authentications(name))
 		result = -1;

 	if (result == 0) {
 		authsuccess = 1;

 		/*
 		 * Record successful login.  We don't have a pty yet, so just
 		 * label the line as "ssh"
 		 */
 		aix_setauthdb(name);

 		/*
 		 * Check if the user's password is expired.
 		 */
 		expired = passwdexpired(name, &msg);
 		if (msg && *msg) {
 			buffer_append(ctxt->loginmsg, msg, strlen(msg));
 			aix_remove_embedded_newlines(msg);
 		}
 		debug3("AIX/passwdexpired returned %d msg %.100s", expired, msg);

 		switch (expired) {
 		case 0: /* password not expired */
 			break;
 		case 1: /* expired, password change required */
 			ctxt->force_pwchange = 1;
 			break;
 		default: /* user can't change(2) or other error (-1) */
 			logit("Password can't be changed for user %s: %.100s",
 			    name, msg);
 			if (msg)
 				xfree(msg);
 			authsuccess = 0;
 		}

 		aix_restoreauthdb();
 	}

 	if (authmsg != NULL)
 		xfree(authmsg);

 	return authsuccess;
 }

 /*
  * Check if specified account is permitted to log in.
  * Returns 1 if login is allowed, 0 if not allowed.
  */
 int
 sys_auth_allowed_user(struct passwd *pw, Buffer *loginmsg)
 {
 	char *msg = NULL;
 	int result, permitted = 0;
 	struct stat st;

 	/*
 	 * Don't perform checks for root account (PermitRootLogin controls
 	 * logins via ssh) or if running as non-root user (since
 	 * loginrestrictions will always fail due to insufficient privilege).
 	 */
 	if (pw->pw_uid == 0 || geteuid() != 0) {
 		debug3("%s: not checking", __func__);
 		return 1;
 	}

 	result = loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &msg);
 	if (result == 0)
 		permitted = 1;
 	/*
 	 * If restricted because /etc/nologin exists, the login will be denied
 	 * in session.c after the nologin message is sent, so allow for now
 	 * and do not append the returned message.
 	 */
 	if (result == -1 && errno == EPERM && stat(_PATH_NOLOGIN, &st) == 0)
 		permitted = 1;
 	else if (msg != NULL)
 		buffer_append(loginmsg, msg, strlen(msg));
 	if (msg == NULL)
 		msg = xstrdup("(none)");
 	aix_remove_embedded_newlines(msg);
 	debug3("AIX/loginrestrictions returned %d msg %.100s", result, msg);

 	if (!permitted)
 		logit("Login restricted for %s: %.100s", pw->pw_name, msg);
 	xfree(msg);
 	return permitted;
 }

 int
 sys_auth_record_login(const char *user, const char *host, const char *ttynm,
     Buffer *loginmsg)
 {
 	char *msg = NULL;
 	int success = 0;

 	aix_setauthdb(user);
 	if (loginsuccess((char *)user, (char *)host, (char *)ttynm, &msg) == 0) {
 		success = 1;
 		if (msg != NULL) {
 			debug("AIX/loginsuccess: msg %s", msg);
 			if (lastlogin_msg == NULL)
 				lastlogin_msg = msg;
 		}
 	}
 	aix_restoreauthdb();
 	return (success);
 }

 char *
 sys_auth_get_lastlogin_msg(const char *user, uid_t uid)
 {
 	char *msg = lastlogin_msg;

 	lastlogin_msg = NULL;
 	return msg;
 }

 #  ifdef CUSTOM_FAILED_LOGIN
 /*
  * record_failed_login: generic "login failed" interface function
  */
 void
 record_failed_login(const char *user, const char *hostname, const char *ttyname)
 {
 	if (geteuid() != 0)
 		return;

 	aix_setauthdb(user);
 #   ifdef AIX_LOGINFAILED_4ARG
 	loginfailed((char *)user, (char *)hostname, (char *)ttyname,
 	    AUDIT_FAIL_AUTH);
 #   else
 	loginfailed((char *)user, (char *)hostname, (char *)ttyname);
 #   endif
 	aix_restoreauthdb();
 }
 #  endif /* CUSTOM_FAILED_LOGIN */

 /*
  * If we have setauthdb, retrieve the password registry for the user's
  * account then feed it to setauthdb.  This will mean that subsequent AIX auth
  * functions will only use the specified loadable module.  If we don't have
  * setauthdb this is a no-op.
  */
 void
 aix_setauthdb(const char *user)
 {
 #  ifdef HAVE_SETAUTHDB
 	char *registry;

 	if (setuserdb(S_READ) == -1) {
 		debug3("%s: Could not open userdb to read", __func__);
 		return;
 	}

 	if (getuserattr((char *)user, S_REGISTRY, &registry, SEC_CHAR) == 0) {
 		if (setauthdb(registry, old_registry) == 0)
 			debug3("AIX/setauthdb set registry '%s'", registry);
 		else
 			debug3("AIX/setauthdb set registry '%s' failed: %s",
 			    registry, strerror(errno));
 	} else
 		debug3("%s: Could not read S_REGISTRY for user: %s", __func__,
 		    strerror(errno));
 	enduserdb();
 #  endif /* HAVE_SETAUTHDB */
 }

 /*
  * Restore the user's registry settings from old_registry.
  * Note that if the first aix_setauthdb fails, setauthdb("") is still safe
  * (it restores the system default behaviour).  If we don't have setauthdb,
  * this is a no-op.
  */
 void
 aix_restoreauthdb(void)
 {
 #  ifdef HAVE_SETAUTHDB
 	if (setauthdb(old_registry, NULL) == 0)
 		debug3("%s: restoring old registry '%s'", __func__,
 		    old_registry);
 	else
 		debug3("%s: failed to restore old registry %s", __func__,
 		    old_registry);
 #  endif /* HAVE_SETAUTHDB */
 }

 # endif /* WITH_AIXAUTHENTICATE */

 # ifdef USE_AIX_KRB_NAME
 /*
  * aix_krb5_get_principal_name: returns the user's kerberos client principal name if
  * configured, otherwise NULL.  Caller must free returned string.
  */
 char *
 aix_krb5_get_principal_name(char *pw_name)
 {
 	char *authname = NULL, *authdomain = NULL, *principal = NULL;

 	setuserdb(S_READ);
 	if (getuserattr(pw_name, S_AUTHDOMAIN, &authdomain, SEC_CHAR) != 0)
 		debug("AIX getuserattr S_AUTHDOMAIN: %s", strerror(errno));
 	if (getuserattr(pw_name, S_AUTHNAME, &authname, SEC_CHAR) != 0)
 		debug("AIX getuserattr S_AUTHNAME: %s", strerror(errno));

 	if (authdomain != NULL)
 		xasprintf(&principal, "%s@%s", authname ? authname : pw_name, authdomain);
 	else if (authname != NULL)
 		principal = xstrdup(authname);
 	enduserdb();
 	return principal;
 }
 # endif /* USE_AIX_KRB_NAME */

 # if defined(AIX_GETNAMEINFO_HACK) && !defined(BROKEN_ADDRINFO)
 # undef getnameinfo
 /*
  * For some reason, AIX's getnameinfo will refuse to resolve the all-zeros
  * IPv6 address into its textual representation ("::"), so we wrap it
  * with a function that will.
  */
 int
 sshaix_getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
     size_t hostlen, char *serv, size_t servlen, int flags)
 {
 	struct sockaddr_in6 *sa6;
 	u_int32_t *a6;

 	if (flags & (NI_NUMERICHOST|NI_NUMERICSERV) &&
 	    sa->sa_family == AF_INET6) {
 		sa6 = (struct sockaddr_in6 *)sa;
 		a6 = sa6->sin6_addr.u6_addr.u6_addr32;

 		if (a6[0] == 0 && a6[1] == 0 && a6[2] == 0 && a6[3] == 0) {
 			strlcpy(host, "::", hostlen);
 			snprintf(serv, servlen, "%d", sa6->sin6_port);
 			return 0;
 		}
 	}
 	return getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
 }
 # endif /* AIX_GETNAMEINFO_HACK */

 # if defined(USE_GETGRSET)
 #  include <stdlib.h>
 int
 getgrouplist(const char *user, gid_t pgid, gid_t *groups, int *grpcnt)
 {
 	char *cp, *grplist, *grp;
 	gid_t gid;
 	int ret = 0, ngroups = 0, maxgroups;
 	long l;

 	maxgroups = *grpcnt;

 	if ((cp = grplist = getgrset(user)) == NULL)
 		return -1;

 	/* handle zero-length case */
 	if (maxgroups <= 0) {
 		*grpcnt = 0;
 		return -1;
 	}

 	/* copy primary group */
 	groups[ngroups++] = pgid;

 	/* copy each entry from getgrset into group list */
 	while ((grp = strsep(&grplist, ",")) != NULL) {
 		l = strtol(grp, NULL, 10);
 		if (ngroups >= maxgroups || l == LONG_MIN || l == LONG_MAX) {
 			ret = -1;
 			goto out;
 		}
 		gid = (gid_t)l;
 		if (gid == pgid)
 			continue;	/* we have already added primary gid */
 		groups[ngroups++] = gid;
 	}
 out:
 	free(cp);
 	*grpcnt = ngroups;
 	return ret;
 }
 # endif	/* USE_GETGRSET */

 #endif /* _AIX */
	/*
	*
	* Copyright (c) 2001 Gert Doering. All rights reserved.
	* Copyright (c) 2003,2004,2005,2006 Darren Tucker. All rights reserved.
	*
	* 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, this list of conditions and the following disclaimer.
	* 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.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 "includes.h"

	#include "xmalloc.h"
	#include "buffer.h"
	#include "key.h"
	#include "hostfile.h"
	#include "auth.h"
	#include "ssh.h"
	#include "log.h"

	#ifdef _AIX

	#include <errno.h>
	#if defined(HAVE_NETDB_H)
	# include <netdb.h>
	#endif
	#include <uinfo.h>
	#include <stdarg.h>
	#include <string.h>
	#include <unistd.h>
	#include <sys/socket.h>

	#ifdef WITH_AIXAUTHENTICATE
	# include <login.h>
	# include <userpw.h>
	# if defined(HAVE_SYS_AUDIT_H) && defined(AIX_LOGINFAILED_4ARG)
	# include <sys/audit.h>
	# endif
	# include <usersec.h>
	#endif

	#include "port-aix.h"

	static char *lastlogin_msg = NULL;

	# ifdef HAVE_SETAUTHDB
	static char old_registry[REGISTRY_SIZE] = "";
	# endif

	/*
	* AIX has a "usrinfo" area where logname and other stuff is stored -
	* a few applications actually use this and die if it's not set
	*
	* NOTE: TTY= should be set, but since no one uses it and it's hard to
	* acquire due to privsep code. We will just drop support.
	*/
	void
	aix_usrinfo(struct passwd *pw)
	{
	u_int i;
	size_t len;
	char *cp;

	len = sizeof("LOGNAME= NAME= ") + (2 * strlen(pw->pw_name));
	cp = xmalloc(len);

	i = snprintf(cp, len, "LOGNAME=%s%cNAME=%s%c", pw->pw_name, '\0',
	pw->pw_name, '\0');
	if (usrinfo(SETUINFO, cp, i) == -1)
	fatal("Couldn't set usrinfo: %s", strerror(errno));
	debug3("AIX/UsrInfo: set len %d", i);

	xfree(cp);
	}

	# ifdef WITH_AIXAUTHENTICATE
	/*
	* Remove embedded newlines in string (if any).
	* Used before logging messages returned by AIX authentication functions
	* so the message is logged on one line.
	*/
	void
	aix_remove_embedded_newlines(char *p)
	{
	if (p == NULL)
	return;

	for (; *p; p++) {
	if (*p == '\n')
	*p = ' ';
	}
	/* Remove trailing whitespace */
	if (*--p == ' ')
	*p = '\0';
	}

	/*
	* Test specifically for the case where SYSTEM == NONE and AUTH1 contains
	* anything other than NONE or SYSTEM, which indicates that the admin has
	* configured the account for purely AUTH1-type authentication.
	*
	* Since authenticate() doesn't check AUTH1, and sshd can't sanely support
	* AUTH1 itself, in such a case authenticate() will allow access without
	* authentation, which is almost certainly not what the admin intends.
	*
	* (The native tools, eg login, will process the AUTH1 list in addition to
	* the SYSTEM list by using ckuserID(), however ckuserID() and AUTH1 methods
	* have been deprecated since AIX 4.2.x and would be very difficult for sshd
	* to support.
	*
	* Returns 0 if an unsupportable combination is found, 1 otherwise.
	*/
	static int
	aix_valid_authentications(const char *user)
	{
	char auth1, sys, *p;
	int valid = 1;

	if (getuserattr((char *)user, S_AUTHSYSTEM, &sys, SEC_CHAR) != 0) {
	logit("Can't retrieve attribute SYSTEM for %s: %.100s",
	user, strerror(errno));
	return 0;
	}

	debug3("AIX SYSTEM attribute %s", sys);
	if (strcmp(sys, "NONE") != 0)
	return 1; /* not "NONE", so is OK */

	if (getuserattr((char *)user, S_AUTH1, &auth1, SEC_LIST) != 0) {
	logit("Can't retrieve attribute auth1 for %s: %.100s",
	user, strerror(errno));
	return 0;
	}

	p = auth1;
	/* A SEC_LIST is concatenated strings, ending with two NULs. */
	while (p[0] != '\0' && p[1] != '\0') {
	debug3("AIX auth1 attribute list member %s", p);
	if (strcmp(p, "NONE") != 0 && strcmp(p, "SYSTEM")) {
	logit("Account %s has unsupported auth1 value '%s'",
	user, p);
	valid = 0;
	}
	p += strlen(p) + 1;
	}

	return (valid);
	}

	/*
	* Do authentication via AIX's authenticate routine. We loop until the
	* reenter parameter is 0, but normally authenticate is called only once.
	*
	* Note: this function returns 1 on success, whereas AIX's authenticate()
	* returns 0.
	*/
	int
	sys_auth_passwd(Authctxt ctxt, const char password)
	{
	char authmsg = NULL, msg = NULL, *name = ctxt->pw->pw_name;
	int authsuccess = 0, expired, reenter, result;

	do {
	result = authenticate((char )name, (char )password, &reenter,
	&authmsg);
	aix_remove_embedded_newlines(authmsg);
	debug3("AIX/authenticate result %d, authmsg %.100s", result,
	authmsg);
	} while (reenter);

	if (!aix_valid_authentications(name))
	result = -1;

	if (result == 0) {
	authsuccess = 1;

	/*
	* Record successful login. We don't have a pty yet, so just
	* label the line as "ssh"
	*/
	aix_setauthdb(name);

	/*
	* Check if the user's password is expired.
	*/
	expired = passwdexpired(name, &msg);
	if (msg && *msg) {
	buffer_append(ctxt->loginmsg, msg, strlen(msg));
	aix_remove_embedded_newlines(msg);
	}
	debug3("AIX/passwdexpired returned %d msg %.100s", expired, msg);

	switch (expired) {
	case 0: /* password not expired */
	break;
	case 1: /* expired, password change required */
	ctxt->force_pwchange = 1;
	break;
	default: /* user can't change(2) or other error (-1) */
	logit("Password can't be changed for user %s: %.100s",
	name, msg);
	if (msg)
	xfree(msg);
	authsuccess = 0;
	}

	aix_restoreauthdb();
	}

	if (authmsg != NULL)
	xfree(authmsg);

	return authsuccess;
	}

	/*
	* Check if specified account is permitted to log in.
	* Returns 1 if login is allowed, 0 if not allowed.
	*/
	int
	sys_auth_allowed_user(struct passwd pw, Buffer loginmsg)
	{
	char *msg = NULL;
	int result, permitted = 0;
	struct stat st;

	/*
	* Don't perform checks for root account (PermitRootLogin controls
	* logins via ssh) or if running as non-root user (since
	* loginrestrictions will always fail due to insufficient privilege).
	*/
	if (pw->pw_uid == 0 \|\| geteuid() != 0) {
	debug3("%s: not checking", __func__);
	return 1;
	}

	result = loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &msg);
	if (result == 0)
	permitted = 1;
	/*
	* If restricted because /etc/nologin exists, the login will be denied
	* in session.c after the nologin message is sent, so allow for now
	* and do not append the returned message.
	*/
	if (result == -1 && errno == EPERM && stat(_PATH_NOLOGIN, &st) == 0)
	permitted = 1;
	else if (msg != NULL)
	buffer_append(loginmsg, msg, strlen(msg));
	if (msg == NULL)
	msg = xstrdup("(none)");
	aix_remove_embedded_newlines(msg);
	debug3("AIX/loginrestrictions returned %d msg %.100s", result, msg);

	if (!permitted)
	logit("Login restricted for %s: %.100s", pw->pw_name, msg);
	xfree(msg);
	return permitted;
	}

	int
	sys_auth_record_login(const char user, const char host, const char *ttynm,
	Buffer *loginmsg)
	{
	char *msg = NULL;
	int success = 0;

	aix_setauthdb(user);
	if (loginsuccess((char )user, (char )host, (char *)ttynm, &msg) == 0) {
	success = 1;
	if (msg != NULL) {
	debug("AIX/loginsuccess: msg %s", msg);
	if (lastlogin_msg == NULL)
	lastlogin_msg = msg;
	}
	}
	aix_restoreauthdb();
	return (success);
	}

	char *
	sys_auth_get_lastlogin_msg(const char *user, uid_t uid)
	{
	char *msg = lastlogin_msg;

	lastlogin_msg = NULL;
	return msg;
	}

	# ifdef CUSTOM_FAILED_LOGIN
	/*
	* record_failed_login: generic "login failed" interface function
	*/
	void
	record_failed_login(const char user, const char hostname, const char *ttyname)
	{
	if (geteuid() != 0)
	return;

	aix_setauthdb(user);
	# ifdef AIX_LOGINFAILED_4ARG
	loginfailed((char )user, (char )hostname, (char *)ttyname,
	AUDIT_FAIL_AUTH);
	# else
	loginfailed((char )user, (char )hostname, (char *)ttyname);
	# endif
	aix_restoreauthdb();
	}
	# endif /* CUSTOM_FAILED_LOGIN */

	/*
	* If we have setauthdb, retrieve the password registry for the user's
	* account then feed it to setauthdb. This will mean that subsequent AIX auth
	* functions will only use the specified loadable module. If we don't have
	* setauthdb this is a no-op.
	*/
	void
	aix_setauthdb(const char *user)
	{
	# ifdef HAVE_SETAUTHDB
	char *registry;

	if (setuserdb(S_READ) == -1) {
	debug3("%s: Could not open userdb to read", __func__);
	return;
	}

	if (getuserattr((char *)user, S_REGISTRY, &registry, SEC_CHAR) == 0) {
	if (setauthdb(registry, old_registry) == 0)
	debug3("AIX/setauthdb set registry '%s'", registry);
	else
	debug3("AIX/setauthdb set registry '%s' failed: %s",
	registry, strerror(errno));
	} else
	debug3("%s: Could not read S_REGISTRY for user: %s", __func__,
	strerror(errno));
	enduserdb();
	# endif /* HAVE_SETAUTHDB */
	}

	/*
	* Restore the user's registry settings from old_registry.
	* Note that if the first aix_setauthdb fails, setauthdb("") is still safe
	* (it restores the system default behaviour). If we don't have setauthdb,
	* this is a no-op.
	*/
	void
	aix_restoreauthdb(void)
	{
	# ifdef HAVE_SETAUTHDB
	if (setauthdb(old_registry, NULL) == 0)
	debug3("%s: restoring old registry '%s'", __func__,
	old_registry);
	else
	debug3("%s: failed to restore old registry %s", __func__,
	old_registry);
	# endif /* HAVE_SETAUTHDB */
	}

	# endif /* WITH_AIXAUTHENTICATE */

	# ifdef USE_AIX_KRB_NAME
	/*
	* aix_krb5_get_principal_name: returns the user's kerberos client principal name if
	* configured, otherwise NULL. Caller must free returned string.
	*/
	char *
	aix_krb5_get_principal_name(char *pw_name)
	{
	char authname = NULL, authdomain = NULL, *principal = NULL;

	setuserdb(S_READ);
	if (getuserattr(pw_name, S_AUTHDOMAIN, &authdomain, SEC_CHAR) != 0)
	debug("AIX getuserattr S_AUTHDOMAIN: %s", strerror(errno));
	if (getuserattr(pw_name, S_AUTHNAME, &authname, SEC_CHAR) != 0)
	debug("AIX getuserattr S_AUTHNAME: %s", strerror(errno));

	if (authdomain != NULL)
	xasprintf(&principal, "%s@%s", authname ? authname : pw_name, authdomain);
	else if (authname != NULL)
	principal = xstrdup(authname);
	enduserdb();
	return principal;
	}
	# endif /* USE_AIX_KRB_NAME */

	# if defined(AIX_GETNAMEINFO_HACK) && !defined(BROKEN_ADDRINFO)
	# undef getnameinfo
	/*
	* For some reason, AIX's getnameinfo will refuse to resolve the all-zeros
	* IPv6 address into its textual representation ("::"), so we wrap it
	* with a function that will.
	*/
	int
	sshaix_getnameinfo(const struct sockaddr sa, size_t salen, char host,
	size_t hostlen, char *serv, size_t servlen, int flags)
	{
	struct sockaddr_in6 *sa6;
	u_int32_t *a6;

	if (flags & (NI_NUMERICHOST\|NI_NUMERICSERV) &&
	sa->sa_family == AF_INET6) {
	sa6 = (struct sockaddr_in6 *)sa;
	a6 = sa6->sin6_addr.u6_addr.u6_addr32;

	if (a6[0] == 0 && a6[1] == 0 && a6[2] == 0 && a6[3] == 0) {
	strlcpy(host, "::", hostlen);
	snprintf(serv, servlen, "%d", sa6->sin6_port);
	return 0;
	}
	}
	return getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
	}
	# endif /* AIX_GETNAMEINFO_HACK */

	# if defined(USE_GETGRSET)
	# include <stdlib.h>
	int
	getgrouplist(const char user, gid_t pgid, gid_t groups, int *grpcnt)
	{
	char cp, grplist, *grp;
	gid_t gid;
	int ret = 0, ngroups = 0, maxgroups;
	long l;

	maxgroups = *grpcnt;

	if ((cp = grplist = getgrset(user)) == NULL)
	return -1;

	/* handle zero-length case */
	if (maxgroups <= 0) {
	*grpcnt = 0;
	return -1;
	}

	/* copy primary group */
	groups[ngroups++] = pgid;

	/* copy each entry from getgrset into group list */
	while ((grp = strsep(&grplist, ",")) != NULL) {
	l = strtol(grp, NULL, 10);
	if (ngroups >= maxgroups \|\| l == LONG_MIN \|\| l == LONG_MAX) {
	ret = -1;
	goto out;
	}
	gid = (gid_t)l;
	if (gid == pgid)
	continue; /* we have already added primary gid */
	groups[ngroups++] = gid;
	}
	out:
	free(cp);
	*grpcnt = ngroups;
	return ret;
	}
	# endif /* USE_GETGRSET */

	#endif /* _AIX */