This commit was generated by cvs2svn to compensate for changes in r30,

which included commits to RCS files with non-trunk default branches.
(This used to be commit 3a69cffb062d4f1238b8cae10481c1f2ea4d3d8b)

1 files changed, 875 insertions, 0 deletions

diff --git a/source4/auth/pampass.c b/source4/auth/pampass.c
new file mode 100644
index 0000000000..045ceb7c72
--- /dev/null
+++ b/source4/auth/pampass.c
@@ -0,0 +1,875 @@
+/* 
+   Unix SMB/CIFS implementation.
+   PAM Password checking
+   Copyright (C) Andrew Tridgell 1992-2001
+   Copyright (C) John H Terpsta 1999-2001
+   Copyright (C) Andrew Bartlett 2001
+   Copyright (C) Jeremy Allison 2001
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/*
+ * This module provides PAM based functions for validation of
+ * username/password pairs, account managment, session and access control.
+ * Note: SMB password checking is done in smbpass.c
+ */
+
+#include "includes.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_AUTH
+
+#ifdef WITH_PAM
+
+/*******************************************************************
+ * Handle PAM authentication 
+ * 	- Access, Authentication, Session, Password
+ *   Note: See PAM Documentation and refer to local system PAM implementation
+ *   which determines what actions/limitations/allowances become affected.
+ *********************************************************************/
+
+#include <security/pam_appl.h>
+
+/*
+ * Structure used to communicate between the conversation function
+ * and the server_login/change password functions.
+ */
+
+struct smb_pam_userdata {
+	const char *PAM_username;
+	const char *PAM_password;
+	const char *PAM_newpassword;
+};
+
+typedef int (*smb_pam_conv_fn)(int, const struct pam_message **, struct pam_response **, void *appdata_ptr);
+
+/*
+ *  Macros to help make life easy
+ */
+#define COPY_STRING(s) (s) ? strdup(s) : NULL
+
+/*******************************************************************
+ PAM error handler.
+ *********************************************************************/
+
+static BOOL smb_pam_error_handler(pam_handle_t *pamh, int pam_error, const char *msg, int dbglvl)
+{
+
+	if( pam_error != PAM_SUCCESS) {
+		DEBUG(dbglvl, ("smb_pam_error_handler: PAM: %s : %s\n",
+				msg, pam_strerror(pamh, pam_error)));
+		
+		return False;
+	}
+	return True;
+}
+
+/*******************************************************************
+ This function is a sanity check, to make sure that we NEVER report
+ failure as sucess.
+*********************************************************************/
+
+static BOOL smb_pam_nt_status_error_handler(pam_handle_t *pamh, int pam_error,
+					    const char *msg, int dbglvl, 
+					    NTSTATUS *nt_status)
+{
+	*nt_status = pam_to_nt_status(pam_error);
+
+	if (smb_pam_error_handler(pamh, pam_error, msg, dbglvl))
+		return True;
+
+	if (NT_STATUS_IS_OK(*nt_status)) {
+		/* Complain LOUDLY */
+		DEBUG(0, ("smb_pam_nt_status_error_handler: PAM: BUG: PAM and NT_STATUS \
+error MISMATCH, forcing to NT_STATUS_LOGON_FAILURE"));
+		*nt_status = NT_STATUS_LOGON_FAILURE;
+	}
+	return False;
+}
+
+/*
+ * PAM conversation function
+ * Here we assume (for now, at least) that echo on means login name, and
+ * echo off means password.
+ */
+
+static int smb_pam_conv(int num_msg,
+		    const struct pam_message **msg,
+		    struct pam_response **resp,
+		    void *appdata_ptr)
+{
+	int replies = 0;
+	struct pam_response *reply = NULL;
+	struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
+
+	*resp = NULL;
+
+	if (num_msg <= 0)
+		return PAM_CONV_ERR;
+
+	/*
+	 * Apparantly HPUX has a buggy PAM that doesn't support the
+	 * appdata_ptr. Fail if this is the case. JRA.
+	 */
+
+	if (udp == NULL) {
+		DEBUG(0,("smb_pam_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
+		return PAM_CONV_ERR;
+	}
+
+	reply = malloc(sizeof(struct pam_response) * num_msg);
+	if (!reply)
+		return PAM_CONV_ERR;
+
+	memset(reply, '\0', sizeof(struct pam_response) * num_msg);
+
+	for (replies = 0; replies < num_msg; replies++) {
+		switch (msg[replies]->msg_style) {
+			case PAM_PROMPT_ECHO_ON:
+				reply[replies].resp_retcode = PAM_SUCCESS;
+				reply[replies].resp = COPY_STRING(udp->PAM_username);
+				/* PAM frees resp */
+				break;
+
+			case PAM_PROMPT_ECHO_OFF:
+				reply[replies].resp_retcode = PAM_SUCCESS;
+				reply[replies].resp = COPY_STRING(udp->PAM_password);
+				/* PAM frees resp */
+				break;
+
+			case PAM_TEXT_INFO:
+				/* fall through */
+
+			case PAM_ERROR_MSG:
+				/* ignore it... */
+				reply[replies].resp_retcode = PAM_SUCCESS;
+				reply[replies].resp = NULL;
+				break;
+
+			default:
+				/* Must be an error of some sort... */
+				SAFE_FREE(reply);
+				return PAM_CONV_ERR;
+		}
+	}
+	if (reply)
+		*resp = reply;
+	return PAM_SUCCESS;
+}
+
+/*
+ * PAM password change conversation function
+ * Here we assume (for now, at least) that echo on means login name, and
+ * echo off means password.
+ */
+
+static void special_char_sub(char *buf)
+{
+	all_string_sub(buf, "\\n", "", 0);
+	all_string_sub(buf, "\\r", "", 0);
+	all_string_sub(buf, "\\s", " ", 0);
+	all_string_sub(buf, "\\t", "\t", 0);
+}
+
+static void pwd_sub(char *buf, const char *username, const char *oldpass, const char *newpass)
+{
+	fstring_sub(buf, "%u", username);
+	all_string_sub(buf, "%o", oldpass, sizeof(fstring));
+	all_string_sub(buf, "%n", newpass, sizeof(fstring));
+}
+
+
+struct chat_struct {
+	struct chat_struct *next, *prev;
+	fstring prompt;
+	fstring reply;
+};
+
+/**************************************************************
+ Create a linked list containing chat data.
+***************************************************************/
+
+static struct chat_struct *make_pw_chat(char *p) 
+{
+	fstring prompt;
+	fstring reply;
+	struct chat_struct *list = NULL;
+	struct chat_struct *t;
+	struct chat_struct *tmp;
+
+	while (1) {
+		t = (struct chat_struct *)malloc(sizeof(*t));
+		if (!t) {
+			DEBUG(0,("make_pw_chat: malloc failed!\n"));
+			return NULL;
+		}
+
+		ZERO_STRUCTP(t);
+
+		DLIST_ADD_END(list, t, tmp);
+
+		if (!next_token(&p, prompt, NULL, sizeof(fstring)))
+			break;
+
+		if (strequal(prompt,"."))
+			fstrcpy(prompt,"*");
+
+		special_char_sub(prompt);
+		fstrcpy(t->prompt, prompt);
+		strlower(t->prompt);
+		trim_string(t->prompt, " ", " ");
+
+		if (!next_token(&p, reply, NULL, sizeof(fstring)))
+			break;
+
+		if (strequal(reply,"."))
+				fstrcpy(reply,"");
+
+		special_char_sub(reply);
+		fstrcpy(t->reply, reply);
+		strlower(t->reply);
+		trim_string(t->reply, " ", " ");
+
+	}
+	return list;
+}
+
+static void free_pw_chat(struct chat_struct *list)
+{
+    while (list) {
+        struct chat_struct *old_head = list;
+        DLIST_REMOVE(list, list);
+        SAFE_FREE(old_head);
+    }
+}
+
+static int smb_pam_passchange_conv(int num_msg,
+				const struct pam_message **msg,
+				struct pam_response **resp,
+				void *appdata_ptr)
+{
+	int replies = 0;
+	struct pam_response *reply = NULL;
+	fstring current_prompt;
+	fstring current_reply;
+	struct smb_pam_userdata *udp = (struct smb_pam_userdata *)appdata_ptr;
+	struct chat_struct *pw_chat= make_pw_chat(lp_passwd_chat());
+	struct chat_struct *t;
+	BOOL found; 
+	*resp = NULL;
+	
+	DEBUG(10,("smb_pam_passchange_conv: starting converstation for %d messages\n", num_msg));
+
+	if (num_msg <= 0)
+		return PAM_CONV_ERR;
+
+	if (pw_chat == NULL)
+		return PAM_CONV_ERR;
+
+	/*
+	 * Apparantly HPUX has a buggy PAM that doesn't support the
+	 * appdata_ptr. Fail if this is the case. JRA.
+	 */
+
+	if (udp == NULL) {
+		DEBUG(0,("smb_pam_passchange_conv: PAM on this system is broken - appdata_ptr == NULL !\n"));
+		free_pw_chat(pw_chat);
+		return PAM_CONV_ERR;
+	}
+
+	reply = malloc(sizeof(struct pam_response) * num_msg);
+	if (!reply) {
+		DEBUG(0,("smb_pam_passchange_conv: malloc for reply failed!\n"));
+		free_pw_chat(pw_chat);
+		return PAM_CONV_ERR;
+	}
+
+	for (replies = 0; replies < num_msg; replies++) {
+		found = False;
+		DEBUG(10,("smb_pam_passchange_conv: Processing message %d\n", replies));
+		switch (msg[replies]->msg_style) {
+		case PAM_PROMPT_ECHO_ON:
+			DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: PAM said: %s\n", msg[replies]->msg));
+			fstrcpy(current_prompt, msg[replies]->msg);
+			trim_string(current_prompt, " ", " ");
+			for (t=pw_chat; t; t=t->next) {
+
+				DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: trying to match |%s| to |%s|\n",
+						t->prompt, current_prompt ));
+
+				if (unix_wild_match(t->prompt, current_prompt) == 0) {
+					fstrcpy(current_reply, t->reply);
+					DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We sent: %s\n", current_reply));
+					pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
+#ifdef DEBUG_PASSWORD
+					DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_ON: We actualy sent: %s\n", current_reply));
+#endif
+					reply[replies].resp_retcode = PAM_SUCCESS;
+					reply[replies].resp = COPY_STRING(current_reply);
+					found = True;
+					break;
+				}
+			}
+			/* PAM frees resp */
+			if (!found) {
+				DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
+				free_pw_chat(pw_chat);
+				SAFE_FREE(reply);
+				return PAM_CONV_ERR;
+			}
+			break;
+
+		case PAM_PROMPT_ECHO_OFF:
+			DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: PAM said: %s\n", msg[replies]->msg));
+			fstrcpy(current_prompt, msg[replies]->msg);
+			trim_string(current_prompt, " ", " ");
+			for (t=pw_chat; t; t=t->next) {
+
+				DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: trying to match |%s| to |%s|\n",
+						t->prompt, current_prompt ));
+
+				if (unix_wild_match(t->prompt, current_prompt) == 0) {
+					fstrcpy(current_reply, t->reply);
+					DEBUG(10,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We sent: %s\n", current_reply));
+					pwd_sub(current_reply, udp->PAM_username, udp->PAM_password, udp->PAM_newpassword);
+					reply[replies].resp_retcode = PAM_SUCCESS;
+					reply[replies].resp = COPY_STRING(current_reply);
+#ifdef DEBUG_PASSWORD
+					DEBUG(100,("smb_pam_passchange_conv: PAM_PROMPT_ECHO_OFF: We actualy sent: %s\n", current_reply));
+#endif
+					found = True;
+					break;
+				}
+			}
+			/* PAM frees resp */
+			
+			if (!found) {
+				DEBUG(3,("smb_pam_passchange_conv: Could not find reply for PAM prompt: %s\n",msg[replies]->msg));
+				free_pw_chat(pw_chat);
+				SAFE_FREE(reply);
+				return PAM_CONV_ERR;
+			}
+			break;
+
+		case PAM_TEXT_INFO:
+			/* fall through */
+
+		case PAM_ERROR_MSG:
+			/* ignore it... */
+			reply[replies].resp_retcode = PAM_SUCCESS;
+			reply[replies].resp = NULL;
+			break;
+			
+		default:
+			/* Must be an error of some sort... */
+			free_pw_chat(pw_chat);
+			SAFE_FREE(reply);
+			return PAM_CONV_ERR;
+		}
+	}
+		
+	free_pw_chat(pw_chat);
+	if (reply)
+		*resp = reply;
+	return PAM_SUCCESS;
+}
+
+/***************************************************************************
+ Free up a malloced pam_conv struct.
+****************************************************************************/
+
+static void smb_free_pam_conv(struct pam_conv *pconv)
+{
+	if (pconv)
+		SAFE_FREE(pconv->appdata_ptr);
+
+	SAFE_FREE(pconv);
+}
+
+/***************************************************************************
+ Allocate a pam_conv struct.
+****************************************************************************/
+
+static struct pam_conv *smb_setup_pam_conv(smb_pam_conv_fn smb_pam_conv_fnptr, const char *user,
+					const char *passwd, const char *newpass)
+{
+	struct pam_conv *pconv = (struct pam_conv *)malloc(sizeof(struct pam_conv));
+	struct smb_pam_userdata *udp = (struct smb_pam_userdata *)malloc(sizeof(struct smb_pam_userdata));
+
+	if (pconv == NULL || udp == NULL) {
+		SAFE_FREE(pconv);
+		SAFE_FREE(udp);
+		return NULL;
+	}
+
+	udp->PAM_username = user;
+	udp->PAM_password = passwd;
+	udp->PAM_newpassword = newpass;
+
+	pconv->conv = smb_pam_conv_fnptr;
+	pconv->appdata_ptr = (void *)udp;
+	return pconv;
+}
+
+/* 
+ * PAM Closing out cleanup handler
+ */
+
+static BOOL smb_pam_end(pam_handle_t *pamh, struct pam_conv *smb_pam_conv_ptr)
+{
+	int pam_error;
+
+	smb_free_pam_conv(smb_pam_conv_ptr);
+       
+	if( pamh != NULL ) {
+		pam_error = pam_end(pamh, 0);
+		if(smb_pam_error_handler(pamh, pam_error, "End Cleanup Failed", 2) == True) {
+			DEBUG(4, ("smb_pam_end: PAM: PAM_END OK.\n"));
+			return True;
+		}
+	}
+	DEBUG(2,("smb_pam_end: PAM: not initialised"));
+	return False;
+}
+
+/*
+ * Start PAM authentication for specified account
+ */
+
+static BOOL smb_pam_start(pam_handle_t **pamh, const char *user, const char *rhost, struct pam_conv *pconv)
+{
+	int pam_error;
+	const char *our_rhost;
+
+	*pamh = (pam_handle_t *)NULL;
+
+	DEBUG(4,("smb_pam_start: PAM: Init user: %s\n", user));
+
+	pam_error = pam_start("samba", user, pconv, pamh);
+	if( !smb_pam_error_handler(*pamh, pam_error, "Init Failed", 0)) {
+		*pamh = (pam_handle_t *)NULL;
+		return False;
+	}
+
+	if (rhost == NULL) {
+		our_rhost = client_name();
+		if (strequal(rhost,"UNKNOWN"))
+			our_rhost = client_addr();
+	} else {
+		our_rhost = rhost;
+	}
+
+#ifdef PAM_RHOST
+	DEBUG(4,("smb_pam_start: PAM: setting rhost to: %s\n", our_rhost));
+	pam_error = pam_set_item(*pamh, PAM_RHOST, our_rhost);
+	if(!smb_pam_error_handler(*pamh, pam_error, "set rhost failed", 0)) {
+		smb_pam_end(*pamh, pconv);
+		*pamh = (pam_handle_t *)NULL;
+		return False;
+	}
+#endif
+#ifdef PAM_TTY
+	DEBUG(4,("smb_pam_start: PAM: setting tty\n"));
+	pam_error = pam_set_item(*pamh, PAM_TTY, "samba");
+	if (!smb_pam_error_handler(*pamh, pam_error, "set tty failed", 0)) {
+		smb_pam_end(*pamh, pconv);
+		*pamh = (pam_handle_t *)NULL;
+		return False;
+	}
+#endif
+	DEBUG(4,("smb_pam_start: PAM: Init passed for user: %s\n", user));
+	return True;
+}
+
+/*
+ * PAM Authentication Handler
+ */
+static NTSTATUS smb_pam_auth(pam_handle_t *pamh, const char *user)
+{
+	int pam_error;
+	NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
+
+	/*
+	 * To enable debugging set in /etc/pam.d/samba:
+	 *	auth required /lib/security/pam_pwdb.so nullok shadow audit
+	 */
+	
+	DEBUG(4,("smb_pam_auth: PAM: Authenticate User: %s\n", user));
+	pam_error = pam_authenticate(pamh, PAM_SILENT | lp_null_passwords() ? 0 : PAM_DISALLOW_NULL_AUTHTOK);
+	switch( pam_error ){
+		case PAM_AUTH_ERR:
+			DEBUG(2, ("smb_pam_auth: PAM: Athentication Error for user %s\n", user));
+			break;
+		case PAM_CRED_INSUFFICIENT:
+			DEBUG(2, ("smb_pam_auth: PAM: Insufficient Credentials for user %s\n", user));
+			break;
+		case PAM_AUTHINFO_UNAVAIL:
+			DEBUG(2, ("smb_pam_auth: PAM: Authentication Information Unavailable for user %s\n", user));
+			break;
+		case PAM_USER_UNKNOWN:
+			DEBUG(2, ("smb_pam_auth: PAM: Username %s NOT known to Authentication system\n", user));
+			break;
+		case PAM_MAXTRIES:
+			DEBUG(2, ("smb_pam_auth: PAM: One or more authentication modules reports user limit for user %s exceeeded\n", user));
+			break;
+		case PAM_ABORT:
+			DEBUG(0, ("smb_pam_auth: PAM: One or more PAM modules failed to load for user %s\n", user));
+			break;
+		case PAM_SUCCESS:
+			DEBUG(4, ("smb_pam_auth: PAM: User %s Authenticated OK\n", user));
+			break;
+		default:
+			DEBUG(0, ("smb_pam_auth: PAM: UNKNOWN ERROR while authenticating user %s\n", user));
+			break;
+	}
+
+	smb_pam_nt_status_error_handler(pamh, pam_error, "Authentication Failure", 2, &nt_status);
+	return nt_status;
+}
+
+/* 
+ * PAM Account Handler
+ */
+static NTSTATUS smb_pam_account(pam_handle_t *pamh, const char * user)
+{
+	int pam_error;
+	NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
+
+	DEBUG(4,("smb_pam_account: PAM: Account Management for User: %s\n", user));
+	pam_error = pam_acct_mgmt(pamh, PAM_SILENT); /* Is user account enabled? */
+	switch( pam_error ) {
+		case PAM_AUTHTOK_EXPIRED:
+			DEBUG(2, ("smb_pam_account: PAM: User %s is valid but password is expired\n", user));
+			break;
+		case PAM_ACCT_EXPIRED:
+			DEBUG(2, ("smb_pam_account: PAM: User %s no longer permitted to access system\n", user));
+			break;
+		case PAM_AUTH_ERR:
+			DEBUG(2, ("smb_pam_account: PAM: There was an authentication error for user %s\n", user));
+			break;
+		case PAM_PERM_DENIED:
+			DEBUG(0, ("smb_pam_account: PAM: User %s is NOT permitted to access system at this time\n", user));
+			break;
+		case PAM_USER_UNKNOWN:
+			DEBUG(0, ("smb_pam_account: PAM: User \"%s\" is NOT known to account management\n", user));
+			break;
+		case PAM_SUCCESS:
+			DEBUG(4, ("smb_pam_account: PAM: Account OK for User: %s\n", user));
+			break;
+		default:
+			DEBUG(0, ("smb_pam_account: PAM: UNKNOWN PAM ERROR (%d) during Account Management for User: %s\n", pam_error, user));
+			break;
+	}
+
+	smb_pam_nt_status_error_handler(pamh, pam_error, "Account Check Failed", 2, &nt_status);
+	return nt_status;
+}
+
+/*
+ * PAM Credential Setting
+ */
+
+static NTSTATUS smb_pam_setcred(pam_handle_t *pamh, const char * user)
+{
+	int pam_error;
+	NTSTATUS nt_status = NT_STATUS_NO_TOKEN;
+
+	/*
+	 * This will allow samba to aquire a kerberos token. And, when
+	 * exporting an AFS cell, be able to /write/ to this cell.
+	 */
+
+	DEBUG(4,("PAM: Account Management SetCredentials for User: %s\n", user));
+	pam_error = pam_setcred(pamh, (PAM_ESTABLISH_CRED|PAM_SILENT)); 
+	switch( pam_error ) {
+		case PAM_CRED_UNAVAIL:
+			DEBUG(0, ("smb_pam_setcred: PAM: Credentials not found for user:%s\n", user ));
+			break;
+		case PAM_CRED_EXPIRED:
+			DEBUG(0, ("smb_pam_setcred: PAM: Credentials for user: \"%s\" EXPIRED!\n", user ));
+			break;
+		case PAM_USER_UNKNOWN:
+			DEBUG(0, ("smb_pam_setcred: PAM: User: \"%s\" is NOT known so can not set credentials!\n", user ));
+			break;
+		case PAM_CRED_ERR:
+			DEBUG(0, ("smb_pam_setcred: PAM: Unknown setcredentials error - unable to set credentials for %s\n", user ));
+			break;
+		case PAM_SUCCESS:
+			DEBUG(4, ("smb_pam_setcred: PAM: SetCredentials OK for User: %s\n", user));
+			break;
+		default:
+			DEBUG(0, ("smb_pam_setcred: PAM: UNKNOWN PAM ERROR (%d) during SetCredentials for User: %s\n", pam_error, user));
+			break;
+	}
+
+	smb_pam_nt_status_error_handler(pamh, pam_error, "Set Credential Failure", 2, &nt_status);
+	return nt_status;
+}
+
+/*
+ * PAM Internal Session Handler
+ */
+static BOOL smb_internal_pam_session(pam_handle_t *pamh, const char *user, const char *tty, BOOL flag)
+{
+	int pam_error;
+
+#ifdef PAM_TTY
+	DEBUG(4,("smb_internal_pam_session: PAM: tty set to: %s\n", tty));
+	pam_error = pam_set_item(pamh, PAM_TTY, tty);
+	if (!smb_pam_error_handler(pamh, pam_error, "set tty failed", 0))
+		return False;
+#endif
+
+	if (flag) {
+		pam_error = pam_open_session(pamh, PAM_SILENT);
+		if (!smb_pam_error_handler(pamh, pam_error, "session setup failed", 0))
+			return False;
+	} else {
+		pam_setcred(pamh, (PAM_DELETE_CRED|PAM_SILENT)); /* We don't care if this fails */
+		pam_error = pam_close_session(pamh, PAM_SILENT); /* This will probably pick up the error anyway */
+		if (!smb_pam_error_handler(pamh, pam_error, "session close failed", 0))
+			return False;
+	}
+	return (True);
+}
+
+/*
+ * Internal PAM Password Changer.
+ */
+
+static BOOL smb_pam_chauthtok(pam_handle_t *pamh, const char * user)
+{
+	int pam_error;
+
+	DEBUG(4,("smb_pam_chauthtok: PAM: Password Change for User: %s\n", user));
+
+	pam_error = pam_chauthtok(pamh, PAM_SILENT); /* Change Password */
+
+	switch( pam_error ) {
+	case PAM_AUTHTOK_ERR:
+		DEBUG(2, ("PAM: unable to obtain the new authentication token - is password to weak?\n"));
+		break;
+
+	/* This doesn't seem to be defined on Solaris. JRA */
+#ifdef PAM_AUTHTOK_RECOVER_ERR
+	case PAM_AUTHTOK_RECOVER_ERR:
+		DEBUG(2, ("PAM: unable to obtain the old authentication token - was the old password wrong?.\n"));
+		break;
+#endif
+
+	case PAM_AUTHTOK_LOCK_BUSY:
+		DEBUG(2, ("PAM: unable to change the authentication token since it is currently locked.\n"));
+		break;
+	case PAM_AUTHTOK_DISABLE_AGING:
+		DEBUG(2, ("PAM: Authentication token aging has been disabled.\n"));
+		break;
+	case PAM_PERM_DENIED:
+		DEBUG(0, ("PAM: Permission denied.\n"));
+		break;
+	case PAM_TRY_AGAIN:
+		DEBUG(0, ("PAM: Could not update all authentication token(s). No authentication tokens were updated.\n"));
+		break;
+	case PAM_USER_UNKNOWN:
+		DEBUG(0, ("PAM: User not known to PAM\n"));
+		break;
+	case PAM_SUCCESS:
+		DEBUG(4, ("PAM: Account OK for User: %s\n", user));
+		break;
+	default:
+		DEBUG(0, ("PAM: UNKNOWN PAM ERROR (%d) for User: %s\n", pam_error, user));
+	}
+ 
+	if(!smb_pam_error_handler(pamh, pam_error, "Password Change Failed", 2)) {
+		return False;
+	}
+
+	/* If this point is reached, the password has changed. */
+	return True;
+}
+
+/*
+ * PAM Externally accessible Session handler
+ */
+
+BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
+{
+	pam_handle_t *pamh = NULL;
+	struct pam_conv *pconv = NULL;
+
+	/* Ignore PAM if told to. */
+
+	if (!lp_obey_pam_restrictions())
+		return True;
+
+	if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
+		return False;
+
+	if (!smb_pam_start(&pamh, user, rhost, pconv))
+		return False;
+
+	if (!smb_internal_pam_session(pamh, user, tty, True)) {
+		smb_pam_end(pamh, pconv);
+		return False;
+	}
+
+	return smb_pam_end(pamh, pconv);
+}
+
+/*
+ * PAM Externally accessible Session handler
+ */
+
+BOOL smb_pam_close_session(char *user, char *tty, char *rhost)
+{
+	pam_handle_t *pamh = NULL;
+	struct pam_conv *pconv = NULL;
+
+	/* Ignore PAM if told to. */
+
+	if (!lp_obey_pam_restrictions())
+		return True;
+
+	if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
+		return False;
+
+	if (!smb_pam_start(&pamh, user, rhost, pconv))
+		return False;
+
+	if (!smb_internal_pam_session(pamh, user, tty, False)) {
+		smb_pam_end(pamh, pconv);
+		return False;
+	}
+
+	return smb_pam_end(pamh, pconv);
+}
+
+/*
+ * PAM Externally accessible Account handler
+ */
+
+NTSTATUS smb_pam_accountcheck(const char * user)
+{
+	NTSTATUS nt_status = NT_STATUS_ACCOUNT_DISABLED;
+	pam_handle_t *pamh = NULL;
+	struct pam_conv *pconv = NULL;
+
+	/* Ignore PAM if told to. */
+
+	if (!lp_obey_pam_restrictions())
+		return NT_STATUS_OK;
+
+	if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, NULL, NULL)) == NULL)
+		return NT_STATUS_NO_MEMORY;
+
+	if (!smb_pam_start(&pamh, user, NULL, pconv))
+		return NT_STATUS_ACCOUNT_DISABLED;
+
+	if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user)))
+		DEBUG(0, ("smb_pam_accountcheck: PAM: Account Validation Failed - Rejecting User %s!\n", user));
+
+	smb_pam_end(pamh, pconv);
+	return nt_status;
+}
+
+/*
+ * PAM Password Validation Suite
+ */
+
+NTSTATUS smb_pam_passcheck(const char * user, const char * password)
+{
+	pam_handle_t *pamh = NULL;
+	NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
+	struct pam_conv *pconv = NULL;
+
+	/*
+	 * Note we can't ignore PAM here as this is the only
+	 * way of doing auths on plaintext passwords when
+	 * compiled --with-pam.
+	 */
+
+	if ((pconv = smb_setup_pam_conv(smb_pam_conv, user, password, NULL)) == NULL)
+		return NT_STATUS_LOGON_FAILURE;
+
+	if (!smb_pam_start(&pamh, user, NULL, pconv))
+		return NT_STATUS_LOGON_FAILURE;
+
+	if (!NT_STATUS_IS_OK(nt_status = smb_pam_auth(pamh, user))) {
+		DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_auth failed - Rejecting User %s !\n", user));
+		smb_pam_end(pamh, pconv);
+		return nt_status;
+	}
+
+	if (!NT_STATUS_IS_OK(nt_status = smb_pam_account(pamh, user))) {
+		DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_account failed - Rejecting User %s !\n", user));
+		smb_pam_end(pamh, pconv);
+		return nt_status;
+	}
+
+	if (!NT_STATUS_IS_OK(nt_status = smb_pam_setcred(pamh, user))) {
+		DEBUG(0, ("smb_pam_passcheck: PAM: smb_pam_setcred failed - Rejecting User %s !\n", user));
+		smb_pam_end(pamh, pconv);
+		return nt_status;
+	}
+
+	smb_pam_end(pamh, pconv);
+	return nt_status;
+}
+
+/*
+ * PAM Password Change Suite
+ */
+
+BOOL smb_pam_passchange(const char * user, const char * oldpassword, const char * newpassword)
+{
+	/* Appropriate quantities of root should be obtained BEFORE calling this function */
+	struct pam_conv *pconv = NULL;
+	pam_handle_t *pamh = NULL;
+
+	if ((pconv = smb_setup_pam_conv(smb_pam_passchange_conv, user, oldpassword, newpassword)) == NULL)
+		return False;
+
+	if(!smb_pam_start(&pamh, user, NULL, pconv))
+		return False;
+
+	if (!smb_pam_chauthtok(pamh, user)) {
+		DEBUG(0, ("smb_pam_passchange: PAM: Password Change Failed for user %s!\n", user));
+		smb_pam_end(pamh, pconv);
+		return False;
+	}
+
+	return smb_pam_end(pamh, pconv);
+}
+
+#else
+
+/* If PAM not used, no PAM restrictions on accounts. */
+NTSTATUS smb_pam_accountcheck(const char * user)
+{
+	return NT_STATUS_OK;
+}
+
+/* If PAM not used, also no PAM restrictions on sessions. */
+BOOL smb_pam_claim_session(char *user, char *tty, char *rhost)
+{
+	return True;
+}
+
+/* If PAM not used, also no PAM restrictions on sessions. */
+BOOL smb_pam_close_session(char *in_user, char *tty, char *rhost)
+{
+	return True;
+}
+#endif /* WITH_PAM */