[gssapi-openssh.git] / openssh / gss-serv.c

/*
 * Copyright (c) 2001-2003 Simon Wilkinson. 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"

#ifdef GSSAPI

#include "ssh.h"
#include "ssh2.h"
#include "xmalloc.h"
#include "buffer.h"
#include "bufaux.h"
#include "packet.h"
#include "compat.h"
#include <openssl/evp.h>
#include "cipher.h"
#include "kex.h"
#include "auth.h"
#include "log.h"
#include "channels.h"
#include "session.h"
#include "dispatch.h"
#include "servconf.h"
#include "compat.h"
#include "monitor_wrap.h"

#include "ssh-gss.h"

extern ServerOptions options;
extern u_char *session_id2;
extern int session_id2_len;

static ssh_gssapi_client gssapi_client =
	{ {0,NULL}, GSS_C_NO_CREDENTIAL, NULL, {NULL,NULL,NULL}};

ssh_gssapi_mech gssapi_null_mech 
  = {NULL, NULL, {0, NULL}, NULL, NULL, NULL, NULL};

#ifdef KRB5
extern ssh_gssapi_mech gssapi_kerberos_mech;
extern ssh_gssapi_mech gssapi_kerberos_mech_old;
#endif
#ifdef GSI
extern ssh_gssapi_mech gssapi_gsi_mech;
extern ssh_gssapi_mech gssapi_gsi_mech_old;
#endif

ssh_gssapi_mech* supported_mechs[]= {
#ifdef KRB5
  &gssapi_kerberos_mech,
  &gssapi_kerberos_mech_old, /* Support for legacy clients */
#endif
#ifdef GSI
  &gssapi_gsi_mech,
  &gssapi_gsi_mech_old,	/* Support for legacy clients */
#endif
  &gssapi_null_mech,
};

/* Return a list of the gss-group1-sha1-x mechanisms supported by this
 * program.
 *
 * We only support the mechanisms that we've indicated in the list above,
 * but we check that they're supported by the GSSAPI mechanism on the 
 * machine. We also check, before including them in the list, that
 * we have the necesary information in order to carry out the key exchange
 * (that is, that the user has credentials, the server's creds are accessible,
 * etc)
 *
 * The way that this is done is fairly nasty, as we do a lot of work that
 * is then thrown away. This should possibly be implemented with a cache
 * that stores the results (in an expanded Gssctxt structure), which are
 * then used by the first calls if that key exchange mechanism is chosen.
 */
 
char * 
ssh_gssapi_server_mechanisms() {
	gss_OID_set 	supported;
	Gssctxt		*ctx = NULL;
	OM_uint32	maj_status, min_status;
	Buffer		buf;
	int 		i = 0;
	int		first = 0;
	int		present;
	char *		mechs;

	if (datafellows & SSH_OLD_GSSAPI) return NULL;
	
	ssh_gssapi_supported_oids(&supported);
	
	buffer_init(&buf);

	while(supported_mechs[i]->name != NULL) {
		if ((maj_status=gss_test_oid_set_member(&min_status,
						   	&supported_mechs[i]->oid,
						   	supported,
						   	&present))) {
			present=0;
		}

		if (present) {
		    if (!GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctx,
					   &supported_mechs[i]->oid)))) {
			/* Append gss_group1_sha1_x to our list */
			if (first++!=0)
				buffer_put_char(&buf,',');
			buffer_append(&buf, KEX_GSS_SHA1,
				      sizeof(KEX_GSS_SHA1)-1);
	        	buffer_append(&buf, 
	        		      supported_mechs[i]->enc_name,
        	      		      strlen(supported_mechs[i]->enc_name));
			debug("GSSAPI mechanism %s (%s%s) supported",
			      supported_mechs[i]->name, KEX_GSS_SHA1,
			      supported_mechs[i]->enc_name);
		    } else {
			debug("no credentials for GSSAPI mechanism %s",
			      supported_mechs[i]->name);
		    }
        	} else {
		    debug("GSSAPI mechanism %s not supported",
			  supported_mechs[i]->name);
		}
        	ssh_gssapi_delete_ctx(&ctx);
        	i++;
	}
	
	buffer_put_char(&buf,'\0');
	
	mechs=xmalloc(buffer_len(&buf));
	buffer_get(&buf,mechs,buffer_len(&buf));
	buffer_free(&buf);
	if (strlen(mechs)==0)
	   return(NULL);
	else
	   return(mechs);
}

void ssh_gssapi_supported_oids(gss_OID_set *oidset) {
	int i =0;
	OM_uint32 maj_status,min_status;
	int present;
	gss_OID_set supported;
	
	gss_create_empty_oid_set(&min_status,oidset);
	PRIVSEP(gss_indicate_mechs(&min_status, &supported));

	while (supported_mechs[i]->name!=NULL) {
		if ((maj_status=gss_test_oid_set_member(&min_status,
						       &supported_mechs[i]->oid,
						       supported,
						       &present))) {
			present=0;
		}
		if (present) {
			gss_add_oid_set_member(&min_status,
					       &supported_mechs[i]->oid,
				       	       oidset);	
		}
		i++;
	}
}	

/* Find out which GSS type (out of the list we define in ssh-gss.h) a
 * particular connection is using 
 */
ssh_gssapi_mech *
ssh_gssapi_get_ctype(Gssctxt *ctxt) {
	int i=0;
	
	while(supported_mechs[i]->name!=NULL) {
	    if (supported_mechs[i]->oid.length == ctxt->oid->length &&
	      	(memcmp(supported_mechs[i]->oid.elements,
			ctxt->oid->elements,ctxt->oid->length)==0)) {
		return supported_mechs[i];
	    }
	    i++;
	}
	return NULL;
}

/* Set the GSS context's OID to the oid indicated by the given key exchange
 * name. */
 
gss_OID 
ssh_gssapi_id_kex(Gssctxt *ctx, char *name) {
  int i=0;
  
  if (strncmp(name, KEX_GSS_SHA1, sizeof(KEX_GSS_SHA1)-1) !=0) {
     return(NULL);
  }
  
  name+=sizeof(KEX_GSS_SHA1)-1; /* Move to the start of the MIME string */
  
  while (supported_mechs[i]->name!=NULL &&
  	strcmp(name,supported_mechs[i]->enc_name)!=0) {
  	i++;
  }

  if (supported_mechs[i]->name==NULL)
     return (NULL);

  if (ctx) ssh_gssapi_set_oid(ctx,&supported_mechs[i]->oid);

  debug("using GSSAPI mechanism %s (%s%s)", supported_mechs[i]->name,
	KEX_GSS_SHA1, supported_mechs[i]->enc_name);

  return &supported_mechs[i]->oid;
}

/* Wrapper arround accept_sec_context
 * Requires that the context contains:
 *    oid		
 *    credentials	(from ssh_gssapi_acquire_cred)
 */
OM_uint32 ssh_gssapi_accept_ctx(Gssctxt *ctx,gss_buffer_desc *recv_tok,
				gss_buffer_desc *send_tok, OM_uint32 *flags) 
{
	OM_uint32 status;
	gss_OID mech;
	
	ctx->major=gss_accept_sec_context(&ctx->minor,
					  &ctx->context,
					  ctx->creds,
					  recv_tok,
					  GSS_C_NO_CHANNEL_BINDINGS,
					  &ctx->client,
					  &mech, /* read-only pointer */
					  send_tok,
					  flags,
					  NULL,
					  &ctx->client_creds);
	if (GSS_ERROR(ctx->major)) {
		ssh_gssapi_error(ctx);
	}
	
	if (ctx->client_creds) {
		debug("Received some client credentials");
	} else {
		debug("Got no client credentials");
	}

	/* FIXME: We should check that the me
	* the one that we asked for (in ctx->oid) */

	status=ctx->major;
	
	/* Now, if we're complete and we have the right flags, then
	* we flag the user as also having been authenticated
	*/
	
	if (((flags==NULL) || ((*flags & GSS_C_MUTUAL_FLAG) && 
	                       (*flags & GSS_C_INTEG_FLAG))) &&
	    (ctx->major == GSS_S_COMPLETE)) {
		if (ssh_gssapi_getclient(ctx,&gssapi_client.mech,
	  			         &gssapi_client.name,
	  			         &gssapi_client.creds))
	  		fatal("Couldn't convert client name");
	}

	/* Make sure that the getclient call hasn't stamped on this */
	return(status);
}

/* Extract the client details from a given context. This can only reliably
 * be called once for a context */

OM_uint32 
ssh_gssapi_getclient(Gssctxt *ctx, ssh_gssapi_mech **type,
		     gss_buffer_desc *name, gss_cred_id_t *creds) {

	*type=ssh_gssapi_get_ctype(ctx);
	if ((ctx->major=gss_display_name(&ctx->minor,ctx->client,name,NULL))) {
		ssh_gssapi_error(ctx);
		return(ctx->major);
	}
	
	/* This is icky. There appears to be no way to copy this structure,
	* rather than the pointer to it, so we simply copy the pointer and
	* mark the originator as empty so we don't destroy it. 
	*/
	*creds=ctx->client_creds;
	ctx->client_creds=GSS_C_NO_CREDENTIAL;
	return(ctx->major);
}

void
ssh_gssapi_cleanup_creds(void *ignored)
{
	if (gssapi_client.store.filename!=NULL) {
		/* Unlink probably isn't sufficient */
		debug("removing gssapi cred file\"%s\"",gssapi_client.store.filename);
		unlink(gssapi_client.store.filename);
	}
}

void 
ssh_gssapi_storecreds()
{
	if (gssapi_client.mech && gssapi_client.mech->storecreds) {
		(*gssapi_client.mech->storecreds)(&gssapi_client);
		if (options.gss_cleanup_creds) {
			fatal_add_cleanup(ssh_gssapi_cleanup_creds, NULL);
		}
	} else {
		debug("ssh_gssapi_storecreds: Not a GSSAPI mechanism");
	}
}

/* This allows GSSAPI methods to do things to the childs environment based
 * on the passed authentication process and credentials.
 *
 * Question: If we didn't use userauth_external for some reason, should we
 * still delegate credentials?
 */
void 
ssh_gssapi_do_child(char ***envp, u_int *envsizep) 
{

	if (gssapi_client.store.envvar!=NULL && 
	    gssapi_client.store.envval!=NULL) {
	    
		debug("Setting %s to %s", gssapi_client.store.envvar,
					  gssapi_client.store.envval);				  
		child_set_env(envp, envsizep, gssapi_client.store.envvar, 
					      gssapi_client.store.envval);
	}
}

int
ssh_gssapi_userok(char *user)
{
	if (gssapi_client.name.length==0 || 
	    gssapi_client.name.value==NULL) {
		debug("No suitable client data");
		return 0;
	}
	if (gssapi_client.mech && gssapi_client.mech->userok) {
		return((*gssapi_client.mech->userok)(&gssapi_client,user));
	} else {
		debug("ssh_gssapi_userok: Unknown GSSAPI mechanism");
	}
	return(0);
}

int
ssh_gssapi_localname(char **user)
{
    	*user = NULL;
	if (gssapi_client.name.length==0 || 
	    gssapi_client.name.value==NULL) {
		debug("No suitable client data");
		return(0);;
	}
	if (gssapi_client.mech && gssapi_client.mech->localname) {
		return((*gssapi_client.mech->localname)(&gssapi_client,user));
	} else {
		debug("Unknown client authentication type");
	}
	return(0);
}
#endif
Commit	Line	Data
5598e598	1	/*
23987cb8	2	* Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved.
5598e598	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	15	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	16	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	17	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	18	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	19	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	20	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	21	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	22	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	23	*/
	24
	25	#include "includes.h"
	26
	27	#ifdef GSSAPI
	28
	29	#include "ssh.h"
	30	#include "ssh2.h"
	31	#include "xmalloc.h"
	32	#include "buffer.h"
	33	#include "bufaux.h"
	34	#include "packet.h"
	35	#include "compat.h"
	36	#include <openssl/evp.h>
	37	#include "cipher.h"
	38	#include "kex.h"
	39	#include "auth.h"
	40	#include "log.h"
e5affddc	41	#include "channels.h"
5598e598	42	#include "session.h"
	43	#include "dispatch.h"
	44	#include "servconf.h"
905081a4	45	#include "compat.h"
b59afbfe	46	#include "monitor_wrap.h"
5598e598	47
	48	#include "ssh-gss.h"
	49
	50	extern ServerOptions options;
	51	extern u_char *session_id2;
	52	extern int session_id2_len;
	53
23987cb8	54	static ssh_gssapi_client gssapi_client =
23987cb8	55	{ {0,NULL}, GSS_C_NO_CREDENTIAL, NULL, {NULL,NULL,NULL}};
5598e598	56
23987cb8	57	ssh_gssapi_mech gssapi_null_mech
23987cb8	58	= {NULL, NULL, {0, NULL}, NULL, NULL, NULL, NULL};
44a053a3	59
5598e598	60	#ifdef KRB5
23987cb8	61	extern ssh_gssapi_mech gssapi_kerberos_mech;
23987cb8	62	extern ssh_gssapi_mech gssapi_kerberos_mech_old;
54425c7a	63	#endif
5598e598	64	#ifdef GSI
23987cb8	65	extern ssh_gssapi_mech gssapi_gsi_mech;
23987cb8	66	extern ssh_gssapi_mech gssapi_gsi_mech_old;
b311f64e	67	#endif
b311f64e	68
23987cb8	69	ssh_gssapi_mech* supported_mechs[]= {
5598e598	70	#ifdef KRB5
23987cb8	71	&gssapi_kerberos_mech,
23987cb8	72	&gssapi_kerberos_mech_old, /* Support for legacy clients */
5598e598	73	#endif
5598e598	74	#ifdef GSI
23987cb8	75	&gssapi_gsi_mech,
23987cb8	76	&gssapi_gsi_mech_old, /* Support for legacy clients */
7b5a625b	77	#endif
23987cb8	78	&gssapi_null_mech,
23987cb8	79	};
5598e598	80
23987cb8	81	/* Return a list of the gss-group1-sha1-x mechanisms supported by this
23987cb8	82	* program.
5598e598	83	*
23987cb8	84	* We only support the mechanisms that we've indicated in the list above,
	85	* but we check that they're supported by the GSSAPI mechanism on the
	86	* machine. We also check, before including them in the list, that
	87	* we have the necesary information in order to carry out the key exchange
	88	* (that is, that the user has credentials, the server's creds are accessible,
	89	* etc)
	90	*
	91	* The way that this is done is fairly nasty, as we do a lot of work that
	92	* is then thrown away. This should possibly be implemented with a cache
	93	* that stores the results (in an expanded Gssctxt structure), which are
	94	* then used by the first calls if that key exchange mechanism is chosen.
6a8bca29	95	*/
23987cb8	96
f001f132	97	char *
23987cb8	98	ssh_gssapi_server_mechanisms() {
f001f132	99	gss_OID_set supported;
23987cb8	100	Gssctxt *ctx = NULL;
f001f132	101	OM_uint32 maj_status, min_status;
	102	Buffer buf;
	103	int i = 0;
23987cb8	104	int first = 0;
f001f132	105	int present;
f001f132	106	char * mechs;
f001f132	107
	108	if (datafellows & SSH_OLD_GSSAPI) return NULL;
	109
23987cb8	110	ssh_gssapi_supported_oids(&supported);
f001f132	111
23987cb8	112	buffer_init(&buf);
f001f132	113
23987cb8	114	while(supported_mechs[i]->name != NULL) {
f001f132	115	if ((maj_status=gss_test_oid_set_member(&min_status,
23987cb8	116	&supported_mechs[i]->oid,
f001f132	117	supported,
	118	&present))) {
	119	present=0;
	120	}
23987cb8	121
f001f132	122	if (present) {
23987cb8	123	if (!GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctx,
	124	&supported_mechs[i]->oid)))) {
	125	/* Append gss_group1_sha1_x to our list */
	126	if (first++!=0)
	127	buffer_put_char(&buf,',');
	128	buffer_append(&buf, KEX_GSS_SHA1,
	129	sizeof(KEX_GSS_SHA1)-1);
	130	buffer_append(&buf,
	131	supported_mechs[i]->enc_name,
	132	strlen(supported_mechs[i]->enc_name));
	133	debug("GSSAPI mechanism %s (%s%s) supported",
	134	supported_mechs[i]->name, KEX_GSS_SHA1,
	135	supported_mechs[i]->enc_name);
	136	} else {
	137	debug("no credentials for GSSAPI mechanism %s",
	138	supported_mechs[i]->name);
	139	}
	140	} else {
f001f132	141	debug("GSSAPI mechanism %s not supported",
23987cb8	142	supported_mechs[i]->name);
f001f132	143	}
23987cb8	144	ssh_gssapi_delete_ctx(&ctx);
	145	i++;
	146	}
f001f132	147
	148	buffer_put_char(&buf,'\0');
	149
	150	mechs=xmalloc(buffer_len(&buf));
	151	buffer_get(&buf,mechs,buffer_len(&buf));
	152	buffer_free(&buf);
	153	if (strlen(mechs)==0)
	154	return(NULL);
	155	else
	156	return(mechs);
	157	}
	158
f001f132	159	void ssh_gssapi_supported_oids(gss_OID_set *oidset) {
23987cb8	160	int i =0;
f001f132	161	OM_uint32 maj_status,min_status;
	162	int present;
	163	gss_OID_set supported;
	164
	165	gss_create_empty_oid_set(&min_status,oidset);
	166	PRIVSEP(gss_indicate_mechs(&min_status, &supported));
	167
23987cb8	168	while (supported_mechs[i]->name!=NULL) {
f001f132	169	if ((maj_status=gss_test_oid_set_member(&min_status,
23987cb8	170	&supported_mechs[i]->oid,
f001f132	171	supported,
	172	&present))) {
	173	present=0;
	174	}
	175	if (present) {
	176	gss_add_oid_set_member(&min_status,
23987cb8	177	&supported_mechs[i]->oid,
f001f132	178	oidset);
	179	}
	180	i++;
	181	}
	182	}
	183
23987cb8	184	/* Find out which GSS type (out of the list we define in ssh-gss.h) a
	185	* particular connection is using
	186	*/
	187	ssh_gssapi_mech *
	188	ssh_gssapi_get_ctype(Gssctxt *ctxt) {
	189	int i=0;
	190
	191	while(supported_mechs[i]->name!=NULL) {
	192	if (supported_mechs[i]->oid.length == ctxt->oid->length &&
	193	(memcmp(supported_mechs[i]->oid.elements,
	194	ctxt->oid->elements,ctxt->oid->length)==0)) {
	195	return supported_mechs[i];
	196	}
	197	i++;
	198	}
	199	return NULL;
	200	}
	201
	202	/* Set the GSS context's OID to the oid indicated by the given key exchange
	203	* name. */
	204
	205	gss_OID
	206	ssh_gssapi_id_kex(Gssctxt ctx, char name) {
	207	int i=0;
	208
	209	if (strncmp(name, KEX_GSS_SHA1, sizeof(KEX_GSS_SHA1)-1) !=0) {
	210	return(NULL);
	211	}
	212
	213	name+=sizeof(KEX_GSS_SHA1)-1; /* Move to the start of the MIME string */
	214
	215	while (supported_mechs[i]->name!=NULL &&
	216	strcmp(name,supported_mechs[i]->enc_name)!=0) {
	217	i++;
	218	}
	219
	220	if (supported_mechs[i]->name==NULL)
	221	return (NULL);
	222
	223	if (ctx) ssh_gssapi_set_oid(ctx,&supported_mechs[i]->oid);
	224
	225	debug("using GSSAPI mechanism %s (%s%s)", supported_mechs[i]->name,
	226	KEX_GSS_SHA1, supported_mechs[i]->enc_name);
	227
	228	return &supported_mechs[i]->oid;
	229	}
	230
f001f132	231	/* Wrapper arround accept_sec_context
	232	* Requires that the context contains:
	233	* oid
	234	* credentials (from ssh_gssapi_acquire_cred)
	235	*/
	236	OM_uint32 ssh_gssapi_accept_ctx(Gssctxt ctx,gss_buffer_desc recv_tok,
	237	gss_buffer_desc send_tok, OM_uint32 flags)
	238	{
23987cb8	239	OM_uint32 status;
f001f132	240	gss_OID mech;
f001f132	241
23987cb8	242	ctx->major=gss_accept_sec_context(&ctx->minor,
f001f132	243	&ctx->context,
	244	ctx->creds,
	245	recv_tok,
	246	GSS_C_NO_CHANNEL_BINDINGS,
	247	&ctx->client,
	248	&mech, /* read-only pointer */
	249	send_tok,
	250	flags,
	251	NULL,
	252	&ctx->client_creds);
23987cb8	253	if (GSS_ERROR(ctx->major)) {
23987cb8	254	ssh_gssapi_error(ctx);
f001f132	255	}
	256
	257	if (ctx->client_creds) {
	258	debug("Received some client credentials");
	259	} else {
	260	debug("Got no client credentials");
	261	}
	262
	263	/* FIXME: We should check that the me
23987cb8	264	* the one that we asked for (in ctx->oid) */
f001f132	265
23987cb8	266	status=ctx->major;
f001f132	267
f001f132	268	/* Now, if we're complete and we have the right flags, then
23987cb8	269	* we flag the user as also having been authenticated
23987cb8	270	*/
f001f132	271
	272	if (((flags==NULL) \|\| ((*flags & GSS_C_MUTUAL_FLAG) &&
	273	(*flags & GSS_C_INTEG_FLAG))) &&
23987cb8	274	(ctx->major == GSS_S_COMPLETE)) {
	275	if (ssh_gssapi_getclient(ctx,&gssapi_client.mech,
	276	&gssapi_client.name,
	277	&gssapi_client.creds))
f001f132	278	fatal("Couldn't convert client name");
	279	}
	280
23987cb8	281	/* Make sure that the getclient call hasn't stamped on this */
	282	return(status);
	283	}
	284
	285	/* Extract the client details from a given context. This can only reliably
	286	* be called once for a context */
	287
	288	OM_uint32
	289	ssh_gssapi_getclient(Gssctxt ctx, ssh_gssapi_mech *type,
	290	gss_buffer_desc name, gss_cred_id_t creds) {
	291
	292	*type=ssh_gssapi_get_ctype(ctx);
	293	if ((ctx->major=gss_display_name(&ctx->minor,ctx->client,name,NULL))) {
	294	ssh_gssapi_error(ctx);
	295	return(ctx->major);
	296	}
	297
	298	/* This is icky. There appears to be no way to copy this structure,
	299	* rather than the pointer to it, so we simply copy the pointer and
	300	* mark the originator as empty so we don't destroy it.
	301	*/
	302	*creds=ctx->client_creds;
	303	ctx->client_creds=GSS_C_NO_CREDENTIAL;
	304	return(ctx->major);
f001f132	305	}
	306
	307	void
23987cb8	308	ssh_gssapi_cleanup_creds(void *ignored)
	309	{
	310	if (gssapi_client.store.filename!=NULL) {
	311	/* Unlink probably isn't sufficient */
	312	debug("removing gssapi cred file\"%s\"",gssapi_client.store.filename);
	313	unlink(gssapi_client.store.filename);
	314	}
	315	}
	316
	317	void
	318	ssh_gssapi_storecreds()
	319	{
	320	if (gssapi_client.mech && gssapi_client.mech->storecreds) {
	321	(*gssapi_client.mech->storecreds)(&gssapi_client);
	322	if (options.gss_cleanup_creds) {
	323	fatal_add_cleanup(ssh_gssapi_cleanup_creds, NULL);
	324	}
	325	} else {
	326	debug("ssh_gssapi_storecreds: Not a GSSAPI mechanism");
	327	}
f001f132	328	}
f001f132	329
23987cb8	330	/* This allows GSSAPI methods to do things to the childs environment based
	331	* on the passed authentication process and credentials.
	332	*
	333	* Question: If we didn't use userauth_external for some reason, should we
	334	* still delegate credentials?
	335	*/
	336	void
	337	ssh_gssapi_do_child(char **envp, u_int envsizep)
	338	{
	339
	340	if (gssapi_client.store.envvar!=NULL &&
	341	gssapi_client.store.envval!=NULL) {
	342
	343	debug("Setting %s to %s", gssapi_client.store.envvar,
	344	gssapi_client.store.envval);
	345	child_set_env(envp, envsizep, gssapi_client.store.envvar,
	346	gssapi_client.store.envval);
	347	}
	348	}
	349
	350	int
	351	ssh_gssapi_userok(char *user)
	352	{
	353	if (gssapi_client.name.length==0 \|\|
	354	gssapi_client.name.value==NULL) {
	355	debug("No suitable client data");
	356	return 0;
	357	}
	358	if (gssapi_client.mech && gssapi_client.mech->userok) {
	359	return((*gssapi_client.mech->userok)(&gssapi_client,user));
	360	} else {
	361	debug("ssh_gssapi_userok: Unknown GSSAPI mechanism");
	362	}
	363	return(0);
	364	}
	365
	366	int
	367	ssh_gssapi_localname(char **user)
	368	{
	369	*user = NULL;
	370	if (gssapi_client.name.length==0 \|\|
	371	gssapi_client.name.value==NULL) {
	372	debug("No suitable client data");
	373	return(0);;
	374	}
	375	if (gssapi_client.mech && gssapi_client.mech->localname) {
	376	return((*gssapi_client.mech->localname)(&gssapi_client,user));
	377	} else {
	378	debug("Unknown client authentication type");
	379	}
	380	return(0);
	381	}
	382	#endif