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|
/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright 2000, 2007-2010 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
/*
* Copyright 1993 by OpenVision Technologies, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appears in all copies and
* that both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of OpenVision not be used
* in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. OpenVision makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
* OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Copyright (C) 1998 by the FundsXpress, INC.
*
* All rights reserved.
*
* Export of this software from the United States of America may require
* a specific license from the United States Government. It is the
* responsibility of any person or organization contemplating export to
* obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of FundsXpress. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. FundsXpress makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "k5-int.h"
#include "gssapiP_krb5.h"
#ifdef HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#ifdef USE_LEASH
#ifdef _WIN64
#define LEASH_DLL "leashw64.dll"
#else
#define LEASH_DLL "leashw32.dll"
#endif
static void (*pLeash_AcquireInitialTicketsIfNeeded)(krb5_context,krb5_principal,char*,int) = NULL;
static HANDLE hLeashDLL = INVALID_HANDLE_VALUE;
#endif
#ifndef LEAN_CLIENT
k5_mutex_t gssint_krb5_keytab_lock = K5_MUTEX_PARTIAL_INITIALIZER;
static char *krb5_gss_keytab = NULL;
/* Heimdal calls this gsskrb5_register_acceptor_identity. */
OM_uint32
gss_krb5int_register_acceptor_identity(OM_uint32 *minor_status,
const gss_OID desired_mech,
const gss_OID desired_object,
gss_buffer_t value)
{
char *new = NULL, *old;
int err;
err = gss_krb5int_initialize_library();
if (err != 0)
return GSS_S_FAILURE;
if (value->value != NULL) {
new = strdup((char *)value->value);
if (new == NULL)
return GSS_S_FAILURE;
}
k5_mutex_lock(&gssint_krb5_keytab_lock);
old = krb5_gss_keytab;
krb5_gss_keytab = new;
k5_mutex_unlock(&gssint_krb5_keytab_lock);
free(old);
return GSS_S_COMPLETE;
}
/* Try to verify that keytab contains at least one entry for name. Return 0 if
* it does, KRB5_KT_NOTFOUND if it doesn't, or another error as appropriate. */
static krb5_error_code
check_keytab(krb5_context context, krb5_keytab kt, krb5_gss_name_t name)
{
krb5_error_code code;
krb5_keytab_entry ent;
krb5_kt_cursor cursor;
krb5_principal accprinc = NULL;
krb5_boolean match;
char *princname;
if (name->service == NULL) {
code = krb5_kt_get_entry(context, kt, name->princ, 0, 0, &ent);
if (code == 0)
krb5_kt_free_entry(context, &ent);
return code;
}
/* If we can't iterate through the keytab, skip this check. */
if (kt->ops->start_seq_get == NULL)
return 0;
/* Get the partial principal for the acceptor name. */
code = kg_acceptor_princ(context, name, &accprinc);
if (code)
return code;
/* Scan the keytab for host-based entries matching accprinc. */
code = krb5_kt_start_seq_get(context, kt, &cursor);
if (code)
goto cleanup;
while ((code = krb5_kt_next_entry(context, kt, &ent, &cursor)) == 0) {
match = krb5_sname_match(context, accprinc, ent.principal);
(void)krb5_free_keytab_entry_contents(context, &ent);
if (match)
break;
}
(void)krb5_kt_end_seq_get(context, kt, &cursor);
if (code == KRB5_KT_END) {
code = KRB5_KT_NOTFOUND;
if (krb5_unparse_name(context, accprinc, &princname) == 0) {
k5_setmsg(context, code, _("No key table entry found matching %s"),
princname);
free(princname);
}
}
cleanup:
krb5_free_principal(context, accprinc);
return code;
}
/* get credentials corresponding to a key in the krb5 keytab.
If successful, set the keytab-specific fields in cred
*/
static OM_uint32
acquire_accept_cred(krb5_context context, OM_uint32 *minor_status,
krb5_keytab req_keytab, const char *rcname,
krb5_gss_cred_id_rec *cred)
{
OM_uint32 major;
krb5_error_code code;
krb5_keytab kt = NULL;
krb5_rcache rc = NULL;
assert(cred->keytab == NULL);
/* If we have an explicit rcache name, open it. */
if (rcname != NULL) {
code = krb5_rc_resolve_full(context, &rc, rcname);
if (code) {
major = GSS_S_FAILURE;
goto cleanup;
}
code = krb5_rc_recover_or_initialize(context, rc, context->clockskew);
if (code) {
major = GSS_S_FAILURE;
goto cleanup;
}
}
if (req_keytab != NULL) {
code = krb5_kt_dup(context, req_keytab, &kt);
} else {
k5_mutex_lock(&gssint_krb5_keytab_lock);
if (krb5_gss_keytab != NULL) {
code = krb5_kt_resolve(context, krb5_gss_keytab, &kt);
k5_mutex_unlock(&gssint_krb5_keytab_lock);
} else {
k5_mutex_unlock(&gssint_krb5_keytab_lock);
code = krb5_kt_default(context, &kt);
}
}
if (code) {
major = GSS_S_CRED_UNAVAIL;
goto cleanup;
}
if (cred->name != NULL) {
/* Make sure we have keys matching the desired name in the keytab. */
code = check_keytab(context, kt, cred->name);
if (code) {
if (code == KRB5_KT_NOTFOUND) {
k5_change_error_message_code(context, code, KG_KEYTAB_NOMATCH);
code = KG_KEYTAB_NOMATCH;
}
major = GSS_S_CRED_UNAVAIL;
goto cleanup;
}
if (rc == NULL) {
/* Open the replay cache for this principal. */
code = krb5_get_server_rcache(context, &cred->name->princ->data[0],
&rc);
if (code) {
major = GSS_S_FAILURE;
goto cleanup;
}
}
} else {
/* Make sure we have a keytab with keys in it. */
code = krb5_kt_have_content(context, kt);
if (code) {
major = GSS_S_CRED_UNAVAIL;
goto cleanup;
}
}
cred->keytab = kt;
kt = NULL;
cred->rcache = rc;
rc = NULL;
major = GSS_S_COMPLETE;
cleanup:
if (kt != NULL)
krb5_kt_close(context, kt);
if (rc != NULL)
krb5_rc_close(context, rc);
*minor_status = code;
return major;
}
#endif /* LEAN_CLIENT */
#ifdef USE_LEASH
static krb5_error_code
get_ccache_leash(krb5_context context, krb5_principal desired_princ,
krb5_ccache *ccache_out)
{
krb5_error_code code;
krb5_ccache ccache;
char ccname[256] = "";
*ccache_out = NULL;
if (hLeashDLL == INVALID_HANDLE_VALUE) {
hLeashDLL = LoadLibrary(LEASH_DLL);
if (hLeashDLL != INVALID_HANDLE_VALUE) {
(FARPROC) pLeash_AcquireInitialTicketsIfNeeded =
GetProcAddress(hLeashDLL, "not_an_API_Leash_AcquireInitialTicketsIfNeeded");
}
}
if (pLeash_AcquireInitialTicketsIfNeeded) {
pLeash_AcquireInitialTicketsIfNeeded(context, desired_princ, ccname,
sizeof(ccname));
if (!ccname[0])
return KRB5_CC_NOTFOUND;
code = krb5_cc_resolve(context, ccname, &ccache);
if (code)
return code;
} else {
/* leash dll not available, open the default credential cache. */
code = krb5int_cc_default(context, &ccache);
if (code)
return code;
}
*ccache_out = ccache;
return 0;
}
#endif /* USE_LEASH */
/* Set fields in cred according to a ccache config entry whose key (in
* principal form) is config_princ and whose value is value. */
static krb5_error_code
scan_cc_config(krb5_context context, krb5_gss_cred_id_rec *cred,
krb5_const_principal config_princ, const krb5_data *value)
{
krb5_error_code code;
krb5_data data0 = empty_data();
if (config_princ->length != 2)
return 0;
if (data_eq_string(config_princ->data[1], KRB5_CC_CONF_PROXY_IMPERSONATOR)
&& cred->impersonator == NULL) {
code = krb5int_copy_data_contents_add0(context, value, &data0);
if (code)
return code;
code = krb5_parse_name(context, data0.data, &cred->impersonator);
krb5_free_data_contents(context, &data0);
if (code)
return code;
} else if (data_eq_string(config_princ->data[1], KRB5_CC_CONF_REFRESH_TIME)
&& cred->refresh_time == 0) {
code = krb5int_copy_data_contents_add0(context, value, &data0);
if (code)
return code;
cred->refresh_time = atol(data0.data);
krb5_free_data_contents(context, &data0);
}
return 0;
}
/* Return true if it appears that we can non-interactively get initial
* tickets for cred. */
static krb5_boolean
can_get_initial_creds(krb5_context context, krb5_gss_cred_id_rec *cred)
{
krb5_error_code code;
krb5_keytab_entry entry;
if (cred->password != NULL)
return TRUE;
/* If we don't know the client principal yet, check for any keytab keys. */
if (cred->name == NULL)
return !krb5_kt_have_content(context, cred->client_keytab);
/* Check if we have a keytab key for the client principal. */
code = krb5_kt_get_entry(context, cred->client_keytab, cred->name->princ,
0, 0, &entry);
if (code) {
krb5_clear_error_message(context);
return FALSE;
}
krb5_free_keytab_entry_contents(context, &entry);
return TRUE;
}
/* Scan cred->ccache for name, expiry time, impersonator, refresh time. */
static krb5_error_code
scan_ccache(krb5_context context, krb5_gss_cred_id_rec *cred)
{
krb5_error_code code;
krb5_ccache ccache = cred->ccache;
krb5_principal ccache_princ = NULL, tgt_princ = NULL;
krb5_data *realm;
krb5_cc_cursor cursor;
krb5_creds creds;
krb5_timestamp endtime;
krb5_boolean is_tgt;
/* Turn off OPENCLOSE mode while extensive frobbing is going on.
* Turn on NOTICKET, as we don't need session keys here. */
code = krb5_cc_set_flags(context, ccache, KRB5_TC_NOTICKET);
if (code)
return code;
/* Credentials cache principal must match the initiator name. */
code = krb5_cc_get_principal(context, ccache, &ccache_princ);
if (code != 0)
goto cleanup;
if (cred->name != NULL &&
!krb5_principal_compare(context, ccache_princ, cred->name->princ)) {
code = KG_CCACHE_NOMATCH;
goto cleanup;
}
/* Save the ccache principal as the credential name if not already set. */
if (!cred->name) {
code = kg_init_name(context, ccache_princ, NULL, NULL, NULL,
KG_INIT_NAME_NO_COPY, &cred->name);
if (code)
goto cleanup;
ccache_princ = NULL;
}
assert(cred->name->princ != NULL);
realm = krb5_princ_realm(context, cred->name->princ);
code = krb5_build_principal_ext(context, &tgt_princ,
realm->length, realm->data,
KRB5_TGS_NAME_SIZE, KRB5_TGS_NAME,
realm->length, realm->data,
0);
if (code)
return code;
/* If there's a tgt for the principal's local realm in here, use its expiry
* time. Otherwise use the first key. */
code = krb5_cc_start_seq_get(context, ccache, &cursor);
if (code) {
krb5_free_principal(context, tgt_princ);
return code;
}
while (!(code = krb5_cc_next_cred(context, ccache, &cursor, &creds))) {
if (krb5_is_config_principal(context, creds.server)) {
code = scan_cc_config(context, cred, creds.server, &creds.ticket);
krb5_free_cred_contents(context, &creds);
if (code)
break;
continue;
}
is_tgt = krb5_principal_compare(context, tgt_princ, creds.server);
endtime = creds.times.endtime;
krb5_free_cred_contents(context, &creds);
if (is_tgt)
cred->have_tgt = TRUE;
if (is_tgt || cred->expire == 0)
cred->expire = endtime;
}
krb5_cc_end_seq_get(context, ccache, &cursor);
if (code && code != KRB5_CC_END)
goto cleanup;
code = 0;
if (cred->expire == 0 && !can_get_initial_creds(context, cred)) {
code = KG_EMPTY_CCACHE;
goto cleanup;
}
(void)krb5_cc_set_flags(context, ccache, KRB5_TC_OPENCLOSE);
cleanup:
(void)krb5_cc_set_flags(context, ccache, KRB5_TC_OPENCLOSE);
krb5_free_principal(context, ccache_princ);
krb5_free_principal(context, tgt_princ);
return code;
}
/* Find an existing or destination ccache for cred->name. */
static krb5_error_code
get_cache_for_name(krb5_context context, krb5_gss_cred_id_rec *cred)
{
krb5_error_code code;
krb5_boolean can_get, have_collection;
krb5_ccache defcc = NULL;
krb5_principal princ = NULL;
const char *cctype;
assert(cred->name != NULL && cred->ccache == NULL);
#ifdef USE_LEASH
code = get_ccache_leash(context, cred->name->princ, &cred->ccache);
return code ? code : scan_ccache(context, cred);
#else
/* Check first whether we can acquire tickets, to avoid overwriting the
* extended error message from krb5_cc_cache_match. */
can_get = can_get_initial_creds(context, cred);
/* Look for an existing cache for the client principal. */
code = krb5_cc_cache_match(context, cred->name->princ, &cred->ccache);
if (code == 0)
return scan_ccache(context, cred);
if (code != KRB5_CC_NOTFOUND || !can_get)
return code;
krb5_clear_error_message(context);
/* There is no existing ccache, but we can acquire credentials. Get the
* default ccache to help decide where we should put them. */
code = krb5_cc_default(context, &defcc);
if (code)
return code;
cctype = krb5_cc_get_type(context, defcc);
have_collection = krb5_cc_support_switch(context, cctype);
/* We can use an empty default ccache if we're using a password or if
* there's no collection. */
if (cred->password != NULL || !have_collection) {
if (krb5_cc_get_principal(context, defcc, &princ) == KRB5_FCC_NOFILE) {
cred->ccache = defcc;
defcc = NULL;
}
krb5_clear_error_message(context);
}
/* Otherwise, try to use a new cache in the collection. */
if (cred->ccache == NULL) {
if (!have_collection) {
code = KG_CCACHE_NOMATCH;
goto cleanup;
}
code = krb5_cc_new_unique(context, cctype, NULL, &cred->ccache);
if (code)
goto cleanup;
}
cleanup:
krb5_free_principal(context, princ);
if (defcc != NULL)
krb5_cc_close(context, defcc);
return code;
#endif /* not USE_LEASH */
}
/* Try to set cred->name using the client keytab. */
static krb5_error_code
get_name_from_client_keytab(krb5_context context, krb5_gss_cred_id_rec *cred)
{
krb5_error_code code;
krb5_principal princ;
assert(cred->name == NULL);
code = k5_kt_get_principal(context, cred->client_keytab, &princ);
if (code)
return code;
code = kg_init_name(context, princ, NULL, NULL, NULL, KG_INIT_NAME_NO_COPY,
&cred->name);
if (code) {
krb5_free_principal(context, princ);
return code;
}
return 0;
}
/* Make a note in ccache that we should attempt to refresh it from the client
* keytab at refresh_time. */
static void
set_refresh_time(krb5_context context, krb5_ccache ccache,
krb5_timestamp refresh_time)
{
char buf[128];
krb5_data d;
snprintf(buf, sizeof(buf), "%ld", (long)refresh_time);
d = string2data(buf);
(void)krb5_cc_set_config(context, ccache, NULL, KRB5_CC_CONF_REFRESH_TIME,
&d);
krb5_clear_error_message(context);
}
/* Return true if it's time to refresh cred from the client keytab. If
* returning true, avoid retrying for 30 seconds. */
krb5_boolean
kg_cred_time_to_refresh(krb5_context context, krb5_gss_cred_id_rec *cred)
{
krb5_timestamp now;
if (krb5_timeofday(context, &now))
return FALSE;
if (cred->refresh_time != 0 && now >= cred->refresh_time) {
set_refresh_time(context, cred->ccache, cred->refresh_time + 30);
return TRUE;
}
return FALSE;
}
/* If appropriate, make a note to refresh cred from the client keytab when it
* is halfway to expired. */
void
kg_cred_set_initial_refresh(krb5_context context, krb5_gss_cred_id_rec *cred,
krb5_ticket_times *times)
{
krb5_timestamp refresh;
/* For now, we only mark keytab-acquired credentials for refresh. */
if (cred->password != NULL)
return;
/* Make a note to refresh these when they are halfway to expired. */
refresh = times->starttime + (times->endtime - times->starttime) / 2;
set_refresh_time(context, cred->ccache, refresh);
}
/* Get initial credentials using the supplied password or client keytab. */
static krb5_error_code
get_initial_cred(krb5_context context, krb5_gss_cred_id_rec *cred)
{
krb5_error_code code;
krb5_get_init_creds_opt *opt = NULL;
krb5_creds creds;
code = krb5_get_init_creds_opt_alloc(context, &opt);
if (code)
return code;
code = krb5_get_init_creds_opt_set_out_ccache(context, opt, cred->ccache);
if (code)
goto cleanup;
if (cred->password != NULL) {
code = krb5_get_init_creds_password(context, &creds, cred->name->princ,
cred->password, NULL, NULL, 0,
NULL, opt);
} else {
code = krb5_get_init_creds_keytab(context, &creds, cred->name->princ,
cred->client_keytab, 0, NULL, opt);
}
if (code)
goto cleanup;
kg_cred_set_initial_refresh(context, cred, &creds.times);
cred->have_tgt = TRUE;
cred->expire = creds.times.endtime;
krb5_free_cred_contents(context, &creds);
cleanup:
krb5_get_init_creds_opt_free(context, opt);
return code;
}
/* Get initial credentials if we ought to and are able to. */
static krb5_error_code
maybe_get_initial_cred(krb5_context context, krb5_gss_cred_id_rec *cred)
{
krb5_error_code code;
/* Don't get creds if we don't know the name or are doing IAKERB. */
if (cred->name == NULL || cred->iakerb_mech)
return 0;
/* Get creds if we have none or if it's time to refresh. */
if (cred->expire == 0 || kg_cred_time_to_refresh(context, cred)) {
code = get_initial_cred(context, cred);
/* If we were trying to refresh and failed, we can keep going. */
if (code && cred->expire == 0)
return code;
krb5_clear_error_message(context);
}
return 0;
}
static OM_uint32
acquire_init_cred(krb5_context context,
OM_uint32 *minor_status,
krb5_ccache req_ccache,
gss_buffer_t password,
krb5_keytab client_keytab,
krb5_gss_cred_id_rec *cred)
{
krb5_error_code code;
krb5_data pwdata, pwcopy;
int caller_ccname = 0;
/* Get ccache from caller if available. */
if (GSS_ERROR(kg_sync_ccache_name(context, minor_status)))
return GSS_S_FAILURE;
if (GSS_ERROR(kg_caller_provided_ccache_name(minor_status,
&caller_ccname)))
return GSS_S_FAILURE;
if (req_ccache != NULL) {
code = krb5_cc_dup(context, req_ccache, &cred->ccache);
if (code)
goto error;
} else if (caller_ccname) {
/* Caller's ccache name has been set as the context default. */
code = krb5int_cc_default(context, &cred->ccache);
if (code)
goto error;
}
if (client_keytab != NULL)
code = krb5_kt_dup(context, client_keytab, &cred->client_keytab);
else
code = krb5_kt_client_default(context, &cred->client_keytab);
if (code)
goto error;
if (password != GSS_C_NO_BUFFER) {
pwdata = make_data(password->value, password->length);
code = krb5int_copy_data_contents_add0(context, &pwdata, &pwcopy);
if (code)
goto error;
cred->password = pwcopy.data;
}
if (cred->ccache != NULL) {
/* The caller specified a ccache; check what's in it. */
code = scan_ccache(context, cred);
if (code == KRB5_FCC_NOFILE) {
/* See if we can get initial creds. If the caller didn't specify
* a name, pick one from the client keytab. */
if (cred->name == NULL) {
if (!get_name_from_client_keytab(context, cred))
code = 0;
} else if (can_get_initial_creds(context, cred)) {
code = 0;
}
}
if (code)
goto error;
} else if (cred->name != NULL) {
/* The caller specified a name but not a ccache; pick a cache. */
code = get_cache_for_name(context, cred);
if (code)
goto error;
}
#ifndef USE_LEASH
/* If we haven't picked a name, make sure we have or can get any creds,
* unless we're using Leash and might be able to get them interactively. */
if (cred->name == NULL && !can_get_initial_creds(context, cred)) {
code = krb5_cccol_have_content(context);
if (code)
goto error;
}
#endif
code = maybe_get_initial_cred(context, cred);
if (code)
goto error;
*minor_status = 0;
return GSS_S_COMPLETE;
error:
*minor_status = code;
return GSS_S_CRED_UNAVAIL;
}
static OM_uint32
acquire_cred_context(krb5_context context, OM_uint32 *minor_status,
gss_name_t desired_name, gss_buffer_t password,
OM_uint32 time_req, gss_cred_usage_t cred_usage,
krb5_ccache ccache, krb5_keytab client_keytab,
krb5_keytab keytab, const char *rcname,
krb5_boolean iakerb, gss_cred_id_t *output_cred_handle,
OM_uint32 *time_rec)
{
krb5_gss_cred_id_t cred = NULL;
krb5_gss_name_t name = (krb5_gss_name_t)desired_name;
OM_uint32 ret;
krb5_error_code code = 0;
/* make sure all outputs are valid */
*output_cred_handle = GSS_C_NO_CREDENTIAL;
if (time_rec)
*time_rec = 0;
/* create the gss cred structure */
cred = k5alloc(sizeof(krb5_gss_cred_id_rec), &code);
if (cred == NULL)
goto krb_error_out;
cred->usage = cred_usage;
cred->name = NULL;
cred->impersonator = NULL;
cred->iakerb_mech = iakerb;
cred->default_identity = (name == NULL);
#ifndef LEAN_CLIENT
cred->keytab = NULL;
#endif /* LEAN_CLIENT */
cred->destroy_ccache = 0;
cred->ccache = NULL;
code = k5_mutex_init(&cred->lock);
if (code)
goto krb_error_out;
switch (cred_usage) {
case GSS_C_INITIATE:
case GSS_C_ACCEPT:
case GSS_C_BOTH:
break;
default:
ret = GSS_S_FAILURE;
*minor_status = (OM_uint32) G_BAD_USAGE;
goto error_out;
}
if (name != NULL) {
code = kg_duplicate_name(context, name, &cred->name);
if (code)
goto krb_error_out;
}
#ifndef LEAN_CLIENT
/*
* If requested, acquire credentials for accepting. This will fill
* in cred->name if desired_princ is specified.
*/
if (cred_usage == GSS_C_ACCEPT || cred_usage == GSS_C_BOTH) {
ret = acquire_accept_cred(context, minor_status, keytab, rcname, cred);
if (ret != GSS_S_COMPLETE)
goto error_out;
}
#endif /* LEAN_CLIENT */
/*
* If requested, acquire credentials for initiation. This will fill
* in cred->name if it wasn't set above.
*/
if (cred_usage == GSS_C_INITIATE || cred_usage == GSS_C_BOTH) {
ret = acquire_init_cred(context, minor_status, ccache, password,
client_keytab, cred);
if (ret != GSS_S_COMPLETE)
goto error_out;
}
assert(cred->default_identity || cred->name != NULL);
/*** at this point, the cred structure has been completely created */
if (cred_usage == GSS_C_ACCEPT) {
if (time_rec)
*time_rec = GSS_C_INDEFINITE;
} else {
krb5_timestamp now;
code = krb5_timeofday(context, &now);
if (code != 0)
goto krb_error_out;
if (time_rec)
*time_rec = (cred->expire > now) ? (cred->expire - now) : 0;
}
*minor_status = 0;
*output_cred_handle = (gss_cred_id_t) cred;
return GSS_S_COMPLETE;
krb_error_out:
*minor_status = code;
ret = GSS_S_FAILURE;
error_out:
if (cred != NULL) {
if (cred->ccache)
krb5_cc_close(context, cred->ccache);
if (cred->client_keytab)
krb5_kt_close(context, cred->client_keytab);
#ifndef LEAN_CLIENT
if (cred->keytab)
krb5_kt_close(context, cred->keytab);
#endif /* LEAN_CLIENT */
if (cred->rcache)
krb5_rc_close(context, cred->rcache);
if (cred->name)
kg_release_name(context, &cred->name);
k5_mutex_destroy(&cred->lock);
xfree(cred);
}
save_error_info(*minor_status, context);
return ret;
}
static OM_uint32
acquire_cred(OM_uint32 *minor_status, gss_name_t desired_name,
gss_buffer_t password, OM_uint32 time_req,
gss_cred_usage_t cred_usage, krb5_ccache ccache,
krb5_keytab keytab, krb5_boolean iakerb,
gss_cred_id_t *output_cred_handle, OM_uint32 *time_rec)
{
krb5_context context = NULL;
krb5_error_code code = 0;
OM_uint32 ret;
code = gss_krb5int_initialize_library();
if (code) {
*minor_status = code;
ret = GSS_S_FAILURE;
goto out;
}
code = krb5_gss_init_context(&context);
if (code) {
*minor_status = code;
ret = GSS_S_FAILURE;
goto out;
}
ret = acquire_cred_context(context, minor_status, desired_name, password,
time_req, cred_usage, ccache, NULL, keytab,
NULL, iakerb, output_cred_handle, time_rec);
out:
krb5_free_context(context);
return ret;
}
/*
* Resolve the name and ccache for an initiator credential if it has not yet
* been done. If specified, use the target name to pick an appropriate ccache
* within the collection. Validates cred_handle and leaves it locked on
* success.
*/
OM_uint32
kg_cred_resolve(OM_uint32 *minor_status, krb5_context context,
gss_cred_id_t cred_handle, gss_name_t target_name)
{
OM_uint32 maj;
krb5_error_code code;
krb5_gss_cred_id_t cred = (krb5_gss_cred_id_t)cred_handle;
krb5_gss_name_t tname = (krb5_gss_name_t)target_name;
krb5_principal client_princ;
*minor_status = 0;
maj = krb5_gss_validate_cred_1(minor_status, cred_handle, context);
if (maj != 0)
return maj;
k5_mutex_assert_locked(&cred->lock);
if (cred->usage == GSS_C_ACCEPT || cred->name != NULL)
return GSS_S_COMPLETE;
/* acquire_init_cred should have set both name and ccache, or neither. */
assert(cred->ccache == NULL);
if (tname != NULL) {
/* Use the target name to select an existing ccache or a principal. */
code = krb5_cc_select(context, tname->princ, &cred->ccache,
&client_princ);
if (code && code != KRB5_CC_NOTFOUND)
goto kerr;
if (client_princ != NULL) {
code = kg_init_name(context, client_princ, NULL, NULL, NULL,
KG_INIT_NAME_NO_COPY, &cred->name);
if (code) {
krb5_free_principal(context, client_princ);
goto kerr;
}
}
if (cred->ccache != NULL) {
code = scan_ccache(context, cred);
if (code)
goto kerr;
}
}
/* If we still haven't picked a client principal, try using an existing
* default ccache. (On Windows, this may acquire initial creds.) */
if (cred->name == NULL) {
code = krb5int_cc_default(context, &cred->ccache);
if (code)
goto kerr;
code = scan_ccache(context, cred);
if (code == KRB5_FCC_NOFILE) {
/* Default ccache doesn't exist; fall through to client keytab. */
krb5_cc_close(context, cred->ccache);
cred->ccache = NULL;
} else if (code) {
goto kerr;
}
}
/* If that didn't work, try getting a name from the client keytab. */
if (cred->name == NULL) {
code = get_name_from_client_keytab(context, cred);
if (code) {
code = KG_EMPTY_CCACHE;
goto kerr;
}
}
if (cred->name != NULL && cred->ccache == NULL) {
/* Pick a cache for the name we chose (from krb5_cc_select or from the
* client keytab). */
code = get_cache_for_name(context, cred);
if (code)
goto kerr;
}
/* Resolve name to ccache and possibly get initial credentials. */
code = maybe_get_initial_cred(context, cred);
if (code)
goto kerr;
return GSS_S_COMPLETE;
kerr:
k5_mutex_unlock(&cred->lock);
save_error_info(code, context);
*minor_status = code;
return GSS_S_CRED_UNAVAIL;
}
OM_uint32
gss_krb5int_set_cred_rcache(OM_uint32 *minor_status,
gss_cred_id_t *cred_handle,
const gss_OID desired_oid,
const gss_buffer_t value)
{
krb5_gss_cred_id_t cred;
krb5_error_code code;
krb5_context context;
krb5_rcache rcache;
assert(value->length == sizeof(rcache));
if (value->length != sizeof(rcache))
return GSS_S_FAILURE;
rcache = (krb5_rcache)value->value;
cred = (krb5_gss_cred_id_t)*cred_handle;
code = krb5_gss_init_context(&context);
if (code) {
*minor_status = code;
return GSS_S_FAILURE;
}
if (cred->rcache != NULL) {
code = krb5_rc_close(context, cred->rcache);
if (code) {
*minor_status = code;
krb5_free_context(context);
return GSS_S_FAILURE;
}
}
cred->rcache = rcache;
krb5_free_context(context);
*minor_status = 0;
return GSS_S_COMPLETE;
}
/*
* krb5 and IAKERB mech API functions follow. The mechglue always passes null
* desired_mechs and actual_mechs, so we ignore those parameters.
*/
OM_uint32 KRB5_CALLCONV
krb5_gss_acquire_cred(OM_uint32 *minor_status, gss_name_t desired_name,
OM_uint32 time_req, gss_OID_set desired_mechs,
gss_cred_usage_t cred_usage,
gss_cred_id_t *output_cred_handle,
gss_OID_set *actual_mechs, OM_uint32 *time_rec)
{
return acquire_cred(minor_status, desired_name, NULL, time_req, cred_usage,
NULL, NULL, FALSE, output_cred_handle, time_rec);
}
OM_uint32 KRB5_CALLCONV
iakerb_gss_acquire_cred(OM_uint32 *minor_status, gss_name_t desired_name,
OM_uint32 time_req, gss_OID_set desired_mechs,
gss_cred_usage_t cred_usage,
gss_cred_id_t *output_cred_handle,
gss_OID_set *actual_mechs, OM_uint32 *time_rec)
{
return acquire_cred(minor_status, desired_name, NULL, time_req, cred_usage,
NULL, NULL, TRUE, output_cred_handle, time_rec);
}
OM_uint32 KRB5_CALLCONV
krb5_gss_acquire_cred_with_password(OM_uint32 *minor_status,
const gss_name_t desired_name,
const gss_buffer_t password,
OM_uint32 time_req,
const gss_OID_set desired_mechs,
int cred_usage,
gss_cred_id_t *output_cred_handle,
gss_OID_set *actual_mechs,
OM_uint32 *time_rec)
{
return acquire_cred(minor_status, desired_name, password, time_req,
cred_usage, NULL, NULL, FALSE, output_cred_handle,
time_rec);
}
OM_uint32 KRB5_CALLCONV
iakerb_gss_acquire_cred_with_password(OM_uint32 *minor_status,
const gss_name_t desired_name,
const gss_buffer_t password,
OM_uint32 time_req,
const gss_OID_set desired_mechs,
int cred_usage,
gss_cred_id_t *output_cred_handle,
gss_OID_set *actual_mechs,
OM_uint32 *time_rec)
{
return acquire_cred(minor_status, desired_name, password, time_req,
cred_usage, NULL, NULL, TRUE, output_cred_handle,
time_rec);
}
OM_uint32
gss_krb5int_import_cred(OM_uint32 *minor_status,
gss_cred_id_t *cred_handle,
const gss_OID desired_oid,
const gss_buffer_t value)
{
struct krb5_gss_import_cred_req *req;
krb5_gss_name_rec name;
OM_uint32 time_rec;
krb5_error_code code;
gss_cred_usage_t usage;
gss_name_t desired_name = GSS_C_NO_NAME;
assert(value->length == sizeof(*req));
if (value->length != sizeof(*req))
return GSS_S_FAILURE;
req = (struct krb5_gss_import_cred_req *)value->value;
if (req->id != NULL) {
usage = (req->keytab != NULL) ? GSS_C_BOTH : GSS_C_INITIATE;
} else if (req->keytab != NULL) {
usage = GSS_C_ACCEPT;
} else {
*minor_status = EINVAL;
return GSS_S_FAILURE;
}
if (req->keytab_principal != NULL) {
memset(&name, 0, sizeof(name));
code = k5_mutex_init(&name.lock);
if (code != 0) {
*minor_status = code;
return GSS_S_FAILURE;
}
name.princ = req->keytab_principal;
desired_name = (gss_name_t)&name;
}
code = acquire_cred(minor_status, desired_name, NULL, GSS_C_INDEFINITE,
usage, req->id, req->keytab, FALSE, cred_handle,
&time_rec);
if (req->keytab_principal != NULL)
k5_mutex_destroy(&name.lock);
return code;
}
OM_uint32 KRB5_CALLCONV
krb5_gss_acquire_cred_from(OM_uint32 *minor_status,
const gss_name_t desired_name,
OM_uint32 time_req,
const gss_OID_set desired_mechs,
gss_cred_usage_t cred_usage,
gss_const_key_value_set_t cred_store,
gss_cred_id_t *output_cred_handle,
gss_OID_set *actual_mechs,
OM_uint32 *time_rec)
{
krb5_context context = NULL;
krb5_error_code code = 0;
krb5_keytab client_keytab = NULL;
krb5_keytab keytab = NULL;
krb5_ccache ccache = NULL;
const char *rcname, *value;
OM_uint32 ret;
code = gss_krb5int_initialize_library();
if (code) {
*minor_status = code;
ret = GSS_S_FAILURE;
goto out;
}
code = krb5_gss_init_context(&context);
if (code) {
*minor_status = code;
ret = GSS_S_FAILURE;
goto out;
}
ret = kg_value_from_cred_store(cred_store, KRB5_CS_CCACHE_URN, &value);
if (GSS_ERROR(ret))
goto out;
if (value) {
code = krb5_cc_resolve(context, value, &ccache);
if (code != 0) {
*minor_status = code;
ret = GSS_S_CRED_UNAVAIL;
goto out;
}
}
ret = kg_value_from_cred_store(cred_store, KRB5_CS_CLI_KEYTAB_URN, &value);
if (GSS_ERROR(ret))
goto out;
if (value) {
code = krb5_kt_resolve(context, value, &client_keytab);
if (code != 0) {
*minor_status = code;
ret = GSS_S_CRED_UNAVAIL;
goto out;
}
}
ret = kg_value_from_cred_store(cred_store, KRB5_CS_KEYTAB_URN, &value);
if (GSS_ERROR(ret))
goto out;
if (value) {
code = krb5_kt_resolve(context, value, &keytab);
if (code != 0) {
*minor_status = code;
ret = GSS_S_CRED_UNAVAIL;
goto out;
}
}
ret = kg_value_from_cred_store(cred_store, KRB5_CS_RCACHE_URN, &rcname);
if (GSS_ERROR(ret))
goto out;
ret = acquire_cred_context(context, minor_status, desired_name, NULL,
time_req, cred_usage, ccache, client_keytab,
keytab, rcname, 0, output_cred_handle,
time_rec);
out:
if (ccache != NULL)
krb5_cc_close(context, ccache);
if (client_keytab != NULL)
krb5_kt_close(context, client_keytab);
if (keytab != NULL)
krb5_kt_close(context, keytab);
krb5_free_context(context);
return ret;
}
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