[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.
 */

/* Unpriviledged */ 
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);
}

/* Unpriviledged */
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 
 */

/* Priviledged (called ssh_gssapi_accept_ctx -> ssh_gssapi_getclient ->) */
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;
}

/* Return the OID that corresponds to the given context name */
 
/* Unpriviledged */
gss_OID 
ssh_gssapi_server_id_kex(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);

  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 around accept_sec_context
 * Requires that the context contains:
 *    oid		
 *    credentials	(from ssh_gssapi_acquire_cred)
 */
/* Priviledged */
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 */

/* Priviledged (called from accept_secure_ctx) */
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);
}

/* As user - called through fatal cleanup hook */
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);
	}
}

/* As user */
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.
 */
/* As user */
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);
	}
}

/* Priviledged */
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);
}

/* Priviledged */
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	*/
e23e524c	96
e23e524c	97	/* Unpriviledged */
f001f132	98	char *
23987cb8	99	ssh_gssapi_server_mechanisms() {
f001f132	100	gss_OID_set supported;
23987cb8	101	Gssctxt *ctx = NULL;
f001f132	102	OM_uint32 maj_status, min_status;
	103	Buffer buf;
	104	int i = 0;
23987cb8	105	int first = 0;
f001f132	106	int present;
f001f132	107	char * mechs;
f001f132	108
	109	if (datafellows & SSH_OLD_GSSAPI) return NULL;
	110
23987cb8	111	ssh_gssapi_supported_oids(&supported);
f001f132	112
23987cb8	113	buffer_init(&buf);
f001f132	114
23987cb8	115	while(supported_mechs[i]->name != NULL) {
f001f132	116	if ((maj_status=gss_test_oid_set_member(&min_status,
23987cb8	117	&supported_mechs[i]->oid,
f001f132	118	supported,
	119	&present))) {
	120	present=0;
	121	}
23987cb8	122
f001f132	123	if (present) {
23987cb8	124	if (!GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctx,
	125	&supported_mechs[i]->oid)))) {
	126	/* Append gss_group1_sha1_x to our list */
	127	if (first++!=0)
	128	buffer_put_char(&buf,',');
	129	buffer_append(&buf, KEX_GSS_SHA1,
	130	sizeof(KEX_GSS_SHA1)-1);
	131	buffer_append(&buf,
	132	supported_mechs[i]->enc_name,
	133	strlen(supported_mechs[i]->enc_name));
	134	debug("GSSAPI mechanism %s (%s%s) supported",
	135	supported_mechs[i]->name, KEX_GSS_SHA1,
	136	supported_mechs[i]->enc_name);
	137	} else {
	138	debug("no credentials for GSSAPI mechanism %s",
	139	supported_mechs[i]->name);
	140	}
	141	} else {
f001f132	142	debug("GSSAPI mechanism %s not supported",
23987cb8	143	supported_mechs[i]->name);
f001f132	144	}
23987cb8	145	ssh_gssapi_delete_ctx(&ctx);
	146	i++;
	147	}
f001f132	148
	149	buffer_put_char(&buf,'\0');
	150
	151	mechs=xmalloc(buffer_len(&buf));
	152	buffer_get(&buf,mechs,buffer_len(&buf));
	153	buffer_free(&buf);
	154	if (strlen(mechs)==0)
	155	return(NULL);
	156	else
	157	return(mechs);
	158	}
	159
e23e524c	160	/* Unpriviledged */
f001f132	161	void ssh_gssapi_supported_oids(gss_OID_set *oidset) {
23987cb8	162	int i =0;
f001f132	163	OM_uint32 maj_status,min_status;
	164	int present;
	165	gss_OID_set supported;
	166
	167	gss_create_empty_oid_set(&min_status,oidset);
	168	PRIVSEP(gss_indicate_mechs(&min_status, &supported));
	169
23987cb8	170	while (supported_mechs[i]->name!=NULL) {
f001f132	171	if ((maj_status=gss_test_oid_set_member(&min_status,
23987cb8	172	&supported_mechs[i]->oid,
f001f132	173	supported,
	174	&present))) {
	175	present=0;
	176	}
	177	if (present) {
	178	gss_add_oid_set_member(&min_status,
23987cb8	179	&supported_mechs[i]->oid,
f001f132	180	oidset);
	181	}
	182	i++;
	183	}
	184	}
	185
23987cb8	186	/* Find out which GSS type (out of the list we define in ssh-gss.h) a
	187	* particular connection is using
	188	*/
e23e524c	189
e23e524c	190	/* Priviledged (called ssh_gssapi_accept_ctx -> ssh_gssapi_getclient ->) */
23987cb8	191	ssh_gssapi_mech *
	192	ssh_gssapi_get_ctype(Gssctxt *ctxt) {
	193	int i=0;
	194
	195	while(supported_mechs[i]->name!=NULL) {
	196	if (supported_mechs[i]->oid.length == ctxt->oid->length &&
	197	(memcmp(supported_mechs[i]->oid.elements,
	198	ctxt->oid->elements,ctxt->oid->length)==0)) {
	199	return supported_mechs[i];
	200	}
	201	i++;
	202	}
	203	return NULL;
	204	}
	205
e23e524c	206	/* Return the OID that corresponds to the given context name */
23987cb8	207
e23e524c	208	/* Unpriviledged */
23987cb8	209	gss_OID
e23e524c	210	ssh_gssapi_server_id_kex(char *name) {
23987cb8	211	int i=0;
	212
	213	if (strncmp(name, KEX_GSS_SHA1, sizeof(KEX_GSS_SHA1)-1) !=0) {
	214	return(NULL);
	215	}
	216
	217	name+=sizeof(KEX_GSS_SHA1)-1; /* Move to the start of the MIME string */
	218
	219	while (supported_mechs[i]->name!=NULL &&
e23e524c	220	strcmp(name,supported_mechs[i]->enc_name)!=0) {
23987cb8	221	i++;
	222	}
	223
	224	if (supported_mechs[i]->name==NULL)
	225	return (NULL);
	226
23987cb8	227	debug("using GSSAPI mechanism %s (%s%s)", supported_mechs[i]->name,
	228	KEX_GSS_SHA1, supported_mechs[i]->enc_name);
	229
	230	return &supported_mechs[i]->oid;
	231	}
	232
e23e524c	233	/* Wrapper around accept_sec_context
f001f132	234	* Requires that the context contains:
	235	* oid
	236	* credentials (from ssh_gssapi_acquire_cred)
	237	*/
e23e524c	238	/* Priviledged */
f001f132	239	OM_uint32 ssh_gssapi_accept_ctx(Gssctxt ctx,gss_buffer_desc recv_tok,
	240	gss_buffer_desc send_tok, OM_uint32 flags)
	241	{
23987cb8	242	OM_uint32 status;
f001f132	243	gss_OID mech;
f001f132	244
23987cb8	245	ctx->major=gss_accept_sec_context(&ctx->minor,
f001f132	246	&ctx->context,
	247	ctx->creds,
	248	recv_tok,
	249	GSS_C_NO_CHANNEL_BINDINGS,
	250	&ctx->client,
	251	&mech, /* read-only pointer */
	252	send_tok,
	253	flags,
	254	NULL,
	255	&ctx->client_creds);
23987cb8	256	if (GSS_ERROR(ctx->major)) {
23987cb8	257	ssh_gssapi_error(ctx);
f001f132	258	}
	259
	260	if (ctx->client_creds) {
	261	debug("Received some client credentials");
	262	} else {
	263	debug("Got no client credentials");
	264	}
	265
	266	/* FIXME: We should check that the me
e23e524c	267	* the one that we asked for (in ctx->oid) */
f001f132	268
23987cb8	269	status=ctx->major;
f001f132	270
f001f132	271	/* Now, if we're complete and we have the right flags, then
e23e524c	272	* we flag the user as also having been authenticated
e23e524c	273	*/
f001f132	274
	275	if (((flags==NULL) \|\| ((*flags & GSS_C_MUTUAL_FLAG) &&
	276	(*flags & GSS_C_INTEG_FLAG))) &&
23987cb8	277	(ctx->major == GSS_S_COMPLETE)) {
	278	if (ssh_gssapi_getclient(ctx,&gssapi_client.mech,
	279	&gssapi_client.name,
	280	&gssapi_client.creds))
f001f132	281	fatal("Couldn't convert client name");
	282	}
	283
23987cb8	284	/* Make sure that the getclient call hasn't stamped on this */
	285	return(status);
	286	}
	287
	288	/* Extract the client details from a given context. This can only reliably
	289	* be called once for a context */
	290
e23e524c	291	/* Priviledged (called from accept_secure_ctx) */
23987cb8	292	OM_uint32
	293	ssh_gssapi_getclient(Gssctxt ctx, ssh_gssapi_mech *type,
	294	gss_buffer_desc name, gss_cred_id_t creds) {
	295
	296	*type=ssh_gssapi_get_ctype(ctx);
	297	if ((ctx->major=gss_display_name(&ctx->minor,ctx->client,name,NULL))) {
	298	ssh_gssapi_error(ctx);
	299	return(ctx->major);
	300	}
	301
	302	/* This is icky. There appears to be no way to copy this structure,
e23e524c	303	* rather than the pointer to it, so we simply copy the pointer and
	304	* mark the originator as empty so we don't destroy it.
	305	*/
23987cb8	306	*creds=ctx->client_creds;
	307	ctx->client_creds=GSS_C_NO_CREDENTIAL;
	308	return(ctx->major);
f001f132	309	}
f001f132	310
e23e524c	311	/* As user - called through fatal cleanup hook */
f001f132	312	void
23987cb8	313	ssh_gssapi_cleanup_creds(void *ignored)
	314	{
	315	if (gssapi_client.store.filename!=NULL) {
	316	/* Unlink probably isn't sufficient */
	317	debug("removing gssapi cred file\"%s\"",gssapi_client.store.filename);
	318	unlink(gssapi_client.store.filename);
	319	}
	320	}
	321
e23e524c	322	/* As user */
23987cb8	323	void
	324	ssh_gssapi_storecreds()
	325	{
	326	if (gssapi_client.mech && gssapi_client.mech->storecreds) {
	327	(*gssapi_client.mech->storecreds)(&gssapi_client);
	328	if (options.gss_cleanup_creds) {
	329	fatal_add_cleanup(ssh_gssapi_cleanup_creds, NULL);
	330	}
	331	} else {
	332	debug("ssh_gssapi_storecreds: Not a GSSAPI mechanism");
	333	}
f001f132	334	}
f001f132	335
23987cb8	336	/* This allows GSSAPI methods to do things to the childs environment based
23987cb8	337	* on the passed authentication process and credentials.
23987cb8	338	*/
e23e524c	339	/* As user */
23987cb8	340	void
	341	ssh_gssapi_do_child(char **envp, u_int envsizep)
	342	{
	343
	344	if (gssapi_client.store.envvar!=NULL &&
	345	gssapi_client.store.envval!=NULL) {
	346
	347	debug("Setting %s to %s", gssapi_client.store.envvar,
	348	gssapi_client.store.envval);
	349	child_set_env(envp, envsizep, gssapi_client.store.envvar,
	350	gssapi_client.store.envval);
	351	}
	352	}
	353
e23e524c	354	/* Priviledged */
23987cb8	355	int
	356	ssh_gssapi_userok(char *user)
	357	{
	358	if (gssapi_client.name.length==0 \|\|
	359	gssapi_client.name.value==NULL) {
	360	debug("No suitable client data");
	361	return 0;
	362	}
	363	if (gssapi_client.mech && gssapi_client.mech->userok) {
	364	return((*gssapi_client.mech->userok)(&gssapi_client,user));
	365	} else {
	366	debug("ssh_gssapi_userok: Unknown GSSAPI mechanism");
	367	}
	368	return(0);
	369	}
	370
e23e524c	371	/* Priviledged */
23987cb8	372	int
	373	ssh_gssapi_localname(char **user)
	374	{
	375	*user = NULL;
	376	if (gssapi_client.name.length==0 \|\|
	377	gssapi_client.name.value==NULL) {
	378	debug("No suitable client data");
	379	return(0);;
	380	}
	381	if (gssapi_client.mech && gssapi_client.mech->localname) {
	382	return((*gssapi_client.mech->localname)(&gssapi_client,user));
	383	} else {
	384	debug("Unknown client authentication type");
	385	}
	386	return(0);
	387	}
	388	#endif