[openssh.git] / gss-serv.c

/* $OpenBSD: gss-serv.c,v 1.21 2007/06/12 08:20:00 djm Exp $ */

/*
 * 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 <sys/types.h>
#include <sys/param.h>

#include <stdarg.h>
#include <string.h>
#include <unistd.h>

#include "xmalloc.h"
#include "buffer.h"
#include "key.h"
#include "hostfile.h"
#include "auth.h"
#include "log.h"
#include "channels.h"
#include "session.h"
#include "misc.h"

#include "ssh-gss.h"

static ssh_gssapi_client gssapi_client =
    { GSS_C_EMPTY_BUFFER, GSS_C_EMPTY_BUFFER,
    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;
#endif

ssh_gssapi_mech* supported_mechs[]= {
#ifdef KRB5
	&gssapi_kerberos_mech,
#endif
	&gssapi_null_mech,
};


/*
 * Acquire credentials for a server running on the current host.
 * Requires that the context structure contains a valid OID
 */

/* Returns a GSSAPI error code */
/* Privileged (called from ssh_gssapi_server_ctx) */
static OM_uint32
ssh_gssapi_acquire_cred(Gssctxt *ctx)
{
	OM_uint32 status;
	char lname[MAXHOSTNAMELEN];
	gss_OID_set oidset;

	gss_create_empty_oid_set(&status, &oidset);
	gss_add_oid_set_member(&status, ctx->oid, &oidset);

	if (gethostname(lname, MAXHOSTNAMELEN)) {
		gss_release_oid_set(&status, &oidset);
		return (-1);
	}

	if (GSS_ERROR(ssh_gssapi_import_name(ctx, lname))) {
		gss_release_oid_set(&status, &oidset);
		return (ctx->major);
	}

	if ((ctx->major = gss_acquire_cred(&ctx->minor,
	    ctx->name, 0, oidset, GSS_C_ACCEPT, &ctx->creds, NULL, NULL)))
		ssh_gssapi_error(ctx);

	gss_release_oid_set(&status, &oidset);
	return (ctx->major);
}

/* Privileged */
OM_uint32
ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid)
{
	if (*ctx)
		ssh_gssapi_delete_ctx(ctx);
	ssh_gssapi_build_ctx(ctx);
	ssh_gssapi_set_oid(*ctx, oid);
	return (ssh_gssapi_acquire_cred(*ctx));
}

/* Unprivileged */
void
ssh_gssapi_supported_oids(gss_OID_set *oidset)
{
	int i = 0;
	OM_uint32 min_status;
	int present;
	gss_OID_set supported;

	gss_create_empty_oid_set(&min_status, oidset);
	gss_indicate_mechs(&min_status, &supported);

	while (supported_mechs[i]->name != NULL) {
		if (GSS_ERROR(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++;
	}

	gss_release_oid_set(&min_status, &supported);
}


/* Wrapper around accept_sec_context
 * Requires that the context contains:
 *    oid
 *    credentials	(from ssh_gssapi_acquire_cred)
 */
/* Privileged */
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,
	    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");

	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))
			fatal("Couldn't convert client name");
	}

	return (status);
}

/*
 * This parses an exported name, extracting the mechanism specific portion
 * to use for ACL checking. It verifies that the name belongs the mechanism
 * originally selected.
 */
static OM_uint32
ssh_gssapi_parse_ename(Gssctxt *ctx, gss_buffer_t ename, gss_buffer_t name)
{
	u_char *tok;
	OM_uint32 offset;
	OM_uint32 oidl;

	tok = ename->value;

	/*
	 * Check that ename is long enough for all of the fixed length
	 * header, and that the initial ID bytes are correct
	 */

	if (ename->length < 6 || memcmp(tok, "\x04\x01", 2) != 0)
		return GSS_S_FAILURE;

	/*
	 * Extract the OID, and check it. Here GSSAPI breaks with tradition
	 * and does use the OID type and length bytes. To confuse things
	 * there are two lengths - the first including these, and the
	 * second without.
	 */

	oidl = get_u16(tok+2); /* length including next two bytes */
	oidl = oidl-2; /* turn it into the _real_ length of the variable OID */

	/*
	 * Check the BER encoding for correct type and length, that the
	 * string is long enough and that the OID matches that in our context
	 */
	if (tok[4] != 0x06 || tok[5] != oidl ||
	    ename->length < oidl+6 ||
	    !ssh_gssapi_check_oid(ctx, tok+6, oidl))
		return GSS_S_FAILURE;

	offset = oidl+6;

	if (ename->length < offset+4)
		return GSS_S_FAILURE;

	name->length = get_u32(tok+offset);
	offset += 4;

	if (ename->length < offset+name->length)
		return GSS_S_FAILURE;

	name->value = xmalloc(name->length+1);
	memcpy(name->value, tok+offset, name->length);
	((char *)name->value)[name->length] = 0;

	return GSS_S_COMPLETE;
}

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

/* Privileged (called from accept_secure_ctx) */
OM_uint32
ssh_gssapi_getclient(Gssctxt *ctx, ssh_gssapi_client *client)
{
	int i = 0;

	gss_buffer_desc ename;

	client->mech = NULL;

	while (supported_mechs[i]->name != NULL) {
		if (supported_mechs[i]->oid.length == ctx->oid->length &&
		    (memcmp(supported_mechs[i]->oid.elements,
		    ctx->oid->elements, ctx->oid->length) == 0))
			client->mech = supported_mechs[i];
		i++;
	}

	if (client->mech == NULL)
		return GSS_S_FAILURE;

	if ((ctx->major = gss_display_name(&ctx->minor, ctx->client,
	    &client->displayname, NULL))) {
		ssh_gssapi_error(ctx);
		return (ctx->major);
	}

	if ((ctx->major = gss_export_name(&ctx->minor, ctx->client,
	    &ename))) {
		ssh_gssapi_error(ctx);
		return (ctx->major);
	}

	if ((ctx->major = ssh_gssapi_parse_ename(ctx,&ename,
	    &client->exportedname))) {
		return (ctx->major);
	}

	/* We can't copy this structure, so we just move the pointer to it */
	client->creds = ctx->client_creds;
	ctx->client_creds = GSS_C_NO_CREDENTIAL;
	return (ctx->major);
}

/* As user - called on fatal/exit */
void
ssh_gssapi_cleanup_creds(void)
{
	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(void)
{
	if (gssapi_client.mech && gssapi_client.mech->storecreds) {
		(*gssapi_client.mech->storecreds)(&gssapi_client);
	} 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);
	}
}

/* Privileged */
int
ssh_gssapi_userok(char *user)
{
	OM_uint32 lmin;

	if (gssapi_client.exportedname.length == 0 ||
	    gssapi_client.exportedname.value == NULL) {
		debug("No suitable client data");
		return 0;
	}
	if (gssapi_client.mech && gssapi_client.mech->userok)
		if ((*gssapi_client.mech->userok)(&gssapi_client, user))
			return 1;
		else {
			/* Destroy delegated credentials if userok fails */
			gss_release_buffer(&lmin, &gssapi_client.displayname);
			gss_release_buffer(&lmin, &gssapi_client.exportedname);
			gss_release_cred(&lmin, &gssapi_client.creds);
			memset(&gssapi_client, 0, sizeof(ssh_gssapi_client));
			return 0;
		}
	else
		debug("ssh_gssapi_userok: Unknown GSSAPI mechanism");
	return (0);
}

/* Privileged */
OM_uint32
ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
{
	ctx->major = gss_verify_mic(&ctx->minor, ctx->context,
	    gssbuf, gssmic, NULL);

	return (ctx->major);
}

#endif
Commit	Line	Data
73d4e9cc	1	/* $OpenBSD: gss-serv.c,v 1.21 2007/06/12 08:20:00 djm Exp $ */
7364bd04	2
	3	/*
	4	* Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	*
	15	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
	16	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	17	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	18	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	19	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	20	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	21	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	22	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	23	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	24	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	25	*/
	26
	27	#include "includes.h"
	28
	29	#ifdef GSSAPI
	30
31652869	31	#include <sys/types.h>
73d4e9cc	32	#include <sys/param.h>
31652869	33
24436b92	34	#include <stdarg.h>
00146caa	35	#include <string.h>
28cb0a43	36	#include <unistd.h>
00146caa	37
31652869	38	#include "xmalloc.h"
	39	#include "buffer.h"
	40	#include "key.h"
	41	#include "hostfile.h"
7364bd04	42	#include "auth.h"
	43	#include "log.h"
	44	#include "channels.h"
	45	#include "session.h"
51e7a012	46	#include "misc.h"
7364bd04	47
	48	#include "ssh-gss.h"
	49
7364bd04	50	static ssh_gssapi_client gssapi_client =
	51	{ GSS_C_EMPTY_BUFFER, GSS_C_EMPTY_BUFFER,
	52	GSS_C_NO_CREDENTIAL, NULL, {NULL, NULL, NULL}};
	53
	54	ssh_gssapi_mech gssapi_null_mech =
	55	{ NULL, NULL, {0, NULL}, NULL, NULL, NULL, NULL};
	56
	57	#ifdef KRB5
	58	extern ssh_gssapi_mech gssapi_kerberos_mech;
	59	#endif
	60
	61	ssh_gssapi_mech* supported_mechs[]= {
	62	#ifdef KRB5
	63	&gssapi_kerberos_mech,
	64	#endif
	65	&gssapi_null_mech,
	66	};
	67
73d4e9cc	68
	69	/*
	70	* Acquire credentials for a server running on the current host.
	71	* Requires that the context structure contains a valid OID
	72	*/
	73
	74	/* Returns a GSSAPI error code */
	75	/* Privileged (called from ssh_gssapi_server_ctx) */
	76	static OM_uint32
	77	ssh_gssapi_acquire_cred(Gssctxt *ctx)
	78	{
	79	OM_uint32 status;
	80	char lname[MAXHOSTNAMELEN];
	81	gss_OID_set oidset;
	82
	83	gss_create_empty_oid_set(&status, &oidset);
	84	gss_add_oid_set_member(&status, ctx->oid, &oidset);
	85
	86	if (gethostname(lname, MAXHOSTNAMELEN)) {
	87	gss_release_oid_set(&status, &oidset);
	88	return (-1);
	89	}
	90
	91	if (GSS_ERROR(ssh_gssapi_import_name(ctx, lname))) {
	92	gss_release_oid_set(&status, &oidset);
	93	return (ctx->major);
	94	}
	95
	96	if ((ctx->major = gss_acquire_cred(&ctx->minor,
	97	ctx->name, 0, oidset, GSS_C_ACCEPT, &ctx->creds, NULL, NULL)))
	98	ssh_gssapi_error(ctx);
	99
	100	gss_release_oid_set(&status, &oidset);
	101	return (ctx->major);
	102	}
	103
	104	/* Privileged */
	105	OM_uint32
	106	ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid)
	107	{
	108	if (*ctx)
	109	ssh_gssapi_delete_ctx(ctx);
	110	ssh_gssapi_build_ctx(ctx);
	111	ssh_gssapi_set_oid(*ctx, oid);
	112	return (ssh_gssapi_acquire_cred(*ctx));
	113	}
	114
6e902aec	115	/* Unprivileged */
7364bd04	116	void
	117	ssh_gssapi_supported_oids(gss_OID_set *oidset)
	118	{
	119	int i = 0;
	120	OM_uint32 min_status;
	121	int present;
	122	gss_OID_set supported;
	123
	124	gss_create_empty_oid_set(&min_status, oidset);
	125	gss_indicate_mechs(&min_status, &supported);
	126
	127	while (supported_mechs[i]->name != NULL) {
	128	if (GSS_ERROR(gss_test_oid_set_member(&min_status,
	129	&supported_mechs[i]->oid, supported, &present)))
	130	present = 0;
	131	if (present)
	132	gss_add_oid_set_member(&min_status,
	133	&supported_mechs[i]->oid, oidset);
	134	i++;
	135	}
7cd30d48	136
7cd30d48	137	gss_release_oid_set(&min_status, &supported);
7364bd04	138	}
	139
	140
	141	/* Wrapper around accept_sec_context
	142	* Requires that the context contains:
	143	* oid
	144	* credentials (from ssh_gssapi_acquire_cred)
	145	*/
6e902aec	146	/* Privileged */
7364bd04	147	OM_uint32
	148	ssh_gssapi_accept_ctx(Gssctxt ctx, gss_buffer_desc recv_tok,
	149	gss_buffer_desc send_tok, OM_uint32 flags)
	150	{
	151	OM_uint32 status;
	152	gss_OID mech;
	153
	154	ctx->major = gss_accept_sec_context(&ctx->minor,
	155	&ctx->context, ctx->creds, recv_tok,
	156	GSS_C_NO_CHANNEL_BINDINGS, &ctx->client, &mech,
	157	send_tok, flags, NULL, &ctx->client_creds);
	158
	159	if (GSS_ERROR(ctx->major))
	160	ssh_gssapi_error(ctx);
	161
	162	if (ctx->client_creds)
	163	debug("Received some client credentials");
	164	else
	165	debug("Got no client credentials");
	166
	167	status = ctx->major;
	168
	169	/* Now, if we're complete and we have the right flags, then
	170	* we flag the user as also having been authenticated
	171	*/
	172
	173	if (((flags == NULL) \|\| ((*flags & GSS_C_MUTUAL_FLAG) &&
	174	(*flags & GSS_C_INTEG_FLAG))) && (ctx->major == GSS_S_COMPLETE)) {
	175	if (ssh_gssapi_getclient(ctx, &gssapi_client))
	176	fatal("Couldn't convert client name");
	177	}
	178
	179	return (status);
	180	}
	181
	182	/*
	183	* This parses an exported name, extracting the mechanism specific portion
	184	* to use for ACL checking. It verifies that the name belongs the mechanism
	185	* originally selected.
	186	*/
	187	static OM_uint32
	188	ssh_gssapi_parse_ename(Gssctxt *ctx, gss_buffer_t ename, gss_buffer_t name)
	189	{
2ceb8101	190	u_char *tok;
7364bd04	191	OM_uint32 offset;
7364bd04	192	OM_uint32 oidl;
a7958e7b	193
8442cc66	194	tok = ename->value;
a7958e7b	195
	196	/*
	197	* Check that ename is long enough for all of the fixed length
7364bd04	198	* header, and that the initial ID bytes are correct
	199	*/
	200
8442cc66	201	if (ename->length < 6 \|\| memcmp(tok, "\x04\x01", 2) != 0)
7364bd04	202	return GSS_S_FAILURE;
	203
	204	/*
	205	* Extract the OID, and check it. Here GSSAPI breaks with tradition
	206	* and does use the OID type and length bytes. To confuse things
	207	* there are two lengths - the first including these, and the
	208	* second without.
	209	*/
	210
51e7a012	211	oidl = get_u16(tok+2); /* length including next two bytes */
7364bd04	212	oidl = oidl-2; /* turn it into the _real_ length of the variable OID */
	213
	214	/*
	215	* Check the BER encoding for correct type and length, that the
	216	* string is long enough and that the OID matches that in our context
	217	*/
	218	if (tok[4] != 0x06 \|\| tok[5] != oidl \|\|
a7958e7b	219	ename->length < oidl+6 \|\|
8442cc66	220	!ssh_gssapi_check_oid(ctx, tok+6, oidl))
7364bd04	221	return GSS_S_FAILURE;
	222
	223	offset = oidl+6;
a7958e7b	224
7364bd04	225	if (ename->length < offset+4)
7364bd04	226	return GSS_S_FAILURE;
a7958e7b	227
51e7a012	228	name->length = get_u32(tok+offset);
7364bd04	229	offset += 4;
a7958e7b	230
7364bd04	231	if (ename->length < offset+name->length)
a7958e7b	232	return GSS_S_FAILURE;
a7958e7b	233
96573c26	234	name->value = xmalloc(name->length+1);
1720c23b	235	memcpy(name->value, tok+offset, name->length);
96573c26	236	((char *)name->value)[name->length] = 0;
96573c26	237
7364bd04	238	return GSS_S_COMPLETE;
a7958e7b	239	}
7364bd04	240
	241	/* Extract the client details from a given context. This can only reliably
	242	* be called once for a context */
	243
6e902aec	244	/* Privileged (called from accept_secure_ctx) */
7364bd04	245	OM_uint32
	246	ssh_gssapi_getclient(Gssctxt ctx, ssh_gssapi_client client)
	247	{
	248	int i = 0;
	249
	250	gss_buffer_desc ename;
a7958e7b	251
7364bd04	252	client->mech = NULL;
	253
	254	while (supported_mechs[i]->name != NULL) {
	255	if (supported_mechs[i]->oid.length == ctx->oid->length &&
	256	(memcmp(supported_mechs[i]->oid.elements,
	257	ctx->oid->elements, ctx->oid->length) == 0))
	258	client->mech = supported_mechs[i];
	259	i++;
	260	}
	261
a7958e7b	262	if (client->mech == NULL)
7364bd04	263	return GSS_S_FAILURE;
a7958e7b	264
a7958e7b	265	if ((ctx->major = gss_display_name(&ctx->minor, ctx->client,
7364bd04	266	&client->displayname, NULL))) {
a7958e7b	267	ssh_gssapi_error(ctx);
a7958e7b	268	return (ctx->major);
7364bd04	269	}
a7958e7b	270
a7958e7b	271	if ((ctx->major = gss_export_name(&ctx->minor, ctx->client,
7364bd04	272	&ename))) {
	273	ssh_gssapi_error(ctx);
	274	return (ctx->major);
	275	}
a7958e7b	276
7364bd04	277	if ((ctx->major = ssh_gssapi_parse_ename(ctx,&ename,
	278	&client->exportedname))) {
	279	return (ctx->major);
	280	}
	281
	282	/* We can't copy this structure, so we just move the pointer to it */
	283	client->creds = ctx->client_creds;
	284	ctx->client_creds = GSS_C_NO_CREDENTIAL;
	285	return (ctx->major);
	286	}
	287
2362db19	288	/* As user - called on fatal/exit */
7364bd04	289	void
2362db19	290	ssh_gssapi_cleanup_creds(void)
7364bd04	291	{
	292	if (gssapi_client.store.filename != NULL) {
	293	/* Unlink probably isn't sufficient */
1720c23b	294	debug("removing gssapi cred file\"%s\"",
1720c23b	295	gssapi_client.store.filename);
7364bd04	296	unlink(gssapi_client.store.filename);
	297	}
	298	}
	299
	300	/* As user */
	301	void
	302	ssh_gssapi_storecreds(void)
	303	{
	304	if (gssapi_client.mech && gssapi_client.mech->storecreds) {
	305	(*gssapi_client.mech->storecreds)(&gssapi_client);
7364bd04	306	} else
	307	debug("ssh_gssapi_storecreds: Not a GSSAPI mechanism");
	308	}
	309
	310	/* This allows GSSAPI methods to do things to the childs environment based
	311	* on the passed authentication process and credentials.
	312	*/
	313	/* As user */
	314	void
	315	ssh_gssapi_do_child(char **envp, u_int envsizep)
	316	{
	317
	318	if (gssapi_client.store.envvar != NULL &&
	319	gssapi_client.store.envval != NULL) {
7364bd04	320	debug("Setting %s to %s", gssapi_client.store.envvar,
8442cc66	321	gssapi_client.store.envval);
7364bd04	322	child_set_env(envp, envsizep, gssapi_client.store.envvar,
4e2e5cfd	323	gssapi_client.store.envval);
7364bd04	324	}
	325	}
	326
67003554	327	/* Privileged */
7364bd04	328	int
	329	ssh_gssapi_userok(char *user)
	330	{
fe206de9	331	OM_uint32 lmin;
fe206de9	332
7364bd04	333	if (gssapi_client.exportedname.length == 0 \|\|
	334	gssapi_client.exportedname.value == NULL) {
	335	debug("No suitable client data");
	336	return 0;
	337	}
	338	if (gssapi_client.mech && gssapi_client.mech->userok)
fe206de9	339	if ((*gssapi_client.mech->userok)(&gssapi_client, user))
	340	return 1;
	341	else {
	342	/* Destroy delegated credentials if userok fails */
	343	gss_release_buffer(&lmin, &gssapi_client.displayname);
	344	gss_release_buffer(&lmin, &gssapi_client.exportedname);
	345	gss_release_cred(&lmin, &gssapi_client.creds);
	346	memset(&gssapi_client, 0, sizeof(ssh_gssapi_client));
	347	return 0;
	348	}
7364bd04	349	else
	350	debug("ssh_gssapi_userok: Unknown GSSAPI mechanism");
	351	return (0);
	352	}
	353
6e902aec	354	/* Privileged */
0789992b	355	OM_uint32
	356	ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
	357	{
	358	ctx->major = gss_verify_mic(&ctx->minor, ctx->context,
	359	gssbuf, gssmic, NULL);
	360
	361	return (ctx->major);
	362	}
	363
7364bd04	364	#endif