r6113: Move GENSEC and the kerberos code out of libcli/auth, and into

auth/gensec and auth/kerberos.

This also pulls the kerberos configure code out of libads (which is
otherwise dead), and into auth/kerberos/kerberos.m4

Andrew Bartlett
(This used to be commit e074d63f3dcf4f84239a10879112ebaf1cfa6c4f)

1 files changed, 478 insertions, 0 deletions

diff --git a/source4/auth/kerberos/clikrb5.c b/source4/auth/kerberos/clikrb5.c
new file mode 100644
index 0000000000..ec8f60fbb3
--- /dev/null
+++ b/source4/auth/kerberos/clikrb5.c
@@ -0,0 +1,478 @@
+/* 
+   Unix SMB/CIFS implementation.
+   simple kerberos5 routines for active directory
+   Copyright (C) Andrew Tridgell 2001
+   Copyright (C) Luke Howard 2002-2003
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "system/network.h"
+#include "system/kerberos.h"
+#include "system/time.h"
+#include "auth/kerberos/kerberos.h"
+
+#ifdef HAVE_KRB5
+
+#ifndef HAVE_KRB5_SET_REAL_TIME
+/*
+ * This function is not in the Heimdal mainline.
+ */
+ krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
+{
+	krb5_error_code ret;
+	int32_t sec, usec;
+
+	ret = krb5_us_timeofday(context, &sec, &usec);
+	if (ret)
+		return ret;
+
+	context->kdc_sec_offset = seconds - sec;
+	context->kdc_usec_offset = microseconds - usec;
+
+	return 0;
+}
+#endif
+
+#if defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES) && !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
+ krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
+{
+	return krb5_set_default_in_tkt_etypes(ctx, enc);
+}
+#endif
+
+#if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
+/* HEIMDAL */
+ void setup_kaddr( krb5_address *pkaddr, struct sockaddr *paddr)
+{
+	pkaddr->addr_type = KRB5_ADDRESS_INET;
+	pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
+	pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
+}
+#elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
+/* MIT */
+ void setup_kaddr( krb5_address *pkaddr, struct sockaddr *paddr)
+{
+	pkaddr->addrtype = ADDRTYPE_INET;
+	pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
+	pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
+}
+#else
+#error UNKNOWN_ADDRTYPE
+#endif
+
+#if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
+ int create_kerberos_key_from_string_direct(krb5_context context,
+					krb5_principal host_princ,
+					krb5_data *password,
+					krb5_keyblock *key,
+					krb5_enctype enctype)
+{
+	int ret;
+	krb5_data salt;
+	krb5_encrypt_block eblock;
+
+	ret = krb5_principal2salt(context, host_princ, &salt);
+	if (ret) {
+		DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
+		return ret;
+	}
+	krb5_use_enctype(context, &eblock, enctype);
+	ret = krb5_string_to_key(context, &eblock, key, password, &salt);
+	SAFE_FREE(salt.data);
+	return ret;
+}
+#elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
+ int create_kerberos_key_from_string_direct(krb5_context context,
+					krb5_principal host_princ,
+					krb5_data *password,
+					krb5_keyblock *key,
+					krb5_enctype enctype)
+{
+	int ret;
+	krb5_salt salt;
+
+	ret = krb5_get_pw_salt(context, host_princ, &salt);
+	if (ret) {
+		DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
+		return ret;
+	}
+	return krb5_string_to_key_salt(context, enctype, password->data,
+		salt, key);
+}
+#else
+#error UNKNOWN_CREATE_KEY_FUNCTIONS
+#endif
+
+ int create_kerberos_key_from_string(krb5_context context,
+					krb5_principal host_princ,
+					krb5_data *password,
+					krb5_keyblock *key,
+					krb5_enctype enctype)
+{
+	krb5_principal salt_princ = NULL;
+	int ret;
+	/*
+	 * Check if we've determined that the KDC is salting keys for this
+	 * principal/enctype in a non-obvious way.  If it is, try to match
+	 * its behavior.
+	 */
+	salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
+	ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
+	if (salt_princ) {
+		krb5_free_principal(context, salt_princ);
+	}
+	return ret;
+}
+
+#if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
+ krb5_error_code get_kerberos_allowed_etypes(krb5_context context, 
+					    krb5_enctype **enctypes)
+{
+	return krb5_get_permitted_enctypes(context, enctypes);
+}
+#elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
+ krb5_error_code get_kerberos_allowed_etypes(krb5_context context, 
+					    krb5_enctype **enctypes)
+{
+	return krb5_get_default_in_tkt_etypes(context, enctypes);
+}
+#else
+#error UNKNOWN_GET_ENCTYPES_FUNCTIONS
+#endif
+
+ void free_kerberos_etypes(krb5_context context, 
+			   krb5_enctype *enctypes)
+{
+#if defined(HAVE_KRB5_FREE_KTYPES)
+	krb5_free_ktypes(context, enctypes);
+	return;
+#else
+	SAFE_FREE(enctypes);
+	return;
+#endif
+}
+
+#if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
+ krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
+					krb5_auth_context auth_context,
+					krb5_keyblock *keyblock)
+{
+	return krb5_auth_con_setkey(context, auth_context, keyblock);
+}
+#endif
+
+ DATA_BLOB get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, 
+ 	 		    krb5_ticket *tkt)
+{
+	DATA_BLOB auth_data = data_blob(NULL, 0); 
+#if defined(HAVE_KRB5_TKT_ENC_PART2)
+	if (tkt && tkt->enc_part2 
+	    && tkt->enc_part2->authorization_data
+	    && tkt->enc_part2->authorization_data[0]
+	    && tkt->enc_part2->authorization_data[0]->length)
+		auth_data = data_blob(tkt->enc_part2->authorization_data[0]->contents,
+			tkt->enc_part2->authorization_data[0]->length);
+#else
+	if (tkt && tkt->ticket.authorization_data && tkt->ticket.authorization_data->len)
+		auth_data = data_blob(tkt->ticket.authorization_data->val->ad_data.data,
+			tkt->ticket.authorization_data->val->ad_data.length);
+#endif
+	return auth_data;
+}
+
+ krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
+{
+#if defined(HAVE_KRB5_TKT_ENC_PART2)
+	return tkt->enc_part2->client;
+#else
+	return tkt->client;
+#endif
+}
+
+#if !defined(HAVE_KRB5_LOCATE_KDC)
+ krb5_error_code krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
+{
+	krb5_krbhst_handle hnd;
+	krb5_krbhst_info *hinfo;
+	krb5_error_code rc;
+	int num_kdcs, i;
+	struct sockaddr *sa;
+	struct addrinfo *ai;
+
+	*addr_pp = NULL;
+	*naddrs = 0;
+
+	rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
+	if (rc) {
+		DEBUG(0, ("krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
+		return rc;
+	}
+
+	for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
+		;
+
+	krb5_krbhst_reset(ctx, hnd);
+
+	if (!num_kdcs) {
+		DEBUG(0, ("krb5_locate_kdc: zero kdcs found !\n"));
+		krb5_krbhst_free(ctx, hnd);
+		return -1;
+	}
+
+	sa = malloc_array_p(struct sockaddr, num_kdcs);
+	if (!sa) {
+		DEBUG(0, ("krb5_locate_kdc: malloc failed\n"));
+		krb5_krbhst_free(ctx, hnd);
+		naddrs = 0;
+		return -1;
+	}
+
+	memset(sa, '\0', sizeof(struct sockaddr) * num_kdcs );
+
+	for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
+
+#if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
+		rc = krb5_krbhst_get_addrinfo(ctx, hinfo, &ai);
+		if (rc) {
+			DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
+			continue;
+		}
+#endif
+		if (hinfo->ai && hinfo->ai->ai_family == AF_INET) 
+			memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
+	}
+
+	krb5_krbhst_free(ctx, hnd);
+
+	*naddrs = num_kdcs;
+	*addr_pp = sa;
+	return 0;
+}
+#endif
+
+#if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
+ void krb5_free_unparsed_name(krb5_context context, char *val)
+{
+	SAFE_FREE(val);
+}
+#endif
+
+ void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
+{
+#if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
+	if (pdata->data) {
+		krb5_free_data_contents(context, pdata);
+	}
+#else
+	SAFE_FREE(pdata->data);
+#endif
+}
+
+ void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
+{
+#if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
+	KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
+#elif defined(HAVE_KRB5_SESSION_IN_CREDS)
+	KRB5_KEY_TYPE((&pcreds->session)) = enctype;
+#else
+#error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
+#endif
+}
+
+ BOOL kerberos_compatible_enctypes(krb5_context context,
+				  krb5_enctype enctype1,
+				  krb5_enctype enctype2)
+{
+#if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
+	krb5_boolean similar = 0;
+
+	krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
+	return similar ? True : False;
+#elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
+	return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
+#endif
+}
+
+static BOOL ads_cleanup_expired_creds(krb5_context context, 
+				      krb5_ccache  ccache,
+				      krb5_creds  *credsp)
+{
+	krb5_error_code retval;
+	TALLOC_CTX *mem_ctx = talloc_init("ticket expied time");
+	if (!mem_ctx) {
+		return False;
+	}
+
+	DEBUG(3, ("Ticket in ccache[%s] expiration %s\n",
+		  krb5_cc_default_name(context),
+		  http_timestring(mem_ctx, credsp->times.endtime)));
+
+	talloc_free(mem_ctx);
+
+	/* we will probably need new tickets if the current ones
+	   will expire within 10 seconds.
+	*/
+	if (credsp->times.endtime >= (time(NULL) + 10))
+		return False;
+
+	/* heimdal won't remove creds from a file ccache, and 
+	   perhaps we shouldn't anyway, since internally we 
+	   use memory ccaches, and a FILE one probably means that
+	   we're using creds obtained outside of our exectuable
+	*/
+	if (StrCaseCmp(krb5_cc_get_type(context, ccache), "FILE") == 0) {
+		DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a FILE ccache\n"));
+		return False;
+	}
+	
+	retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
+	if (retval) {
+		DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
+			  error_message(retval)));
+		/* If we have an error in this, we want to display it,
+		   but continue as though we deleted it */
+	}
+	return True;
+}
+
+/*
+  we can't use krb5_mk_req because w2k wants the service to be in a particular format
+*/
+krb5_error_code ads_krb5_mk_req(krb5_context context, 
+				krb5_auth_context *auth_context, 
+				const krb5_flags ap_req_options,
+				const char *principal,
+				krb5_ccache ccache, 
+				krb5_data *outbuf)
+{
+	krb5_error_code 	  retval;
+	krb5_principal	  server;
+	krb5_creds 		* credsp;
+	krb5_creds 		  creds;
+	krb5_data in_data;
+	BOOL creds_ready = False;
+	
+	TALLOC_CTX *mem_ctx = NULL;
+
+	retval = krb5_parse_name(context, principal, &server);
+	if (retval) {
+		DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
+		return retval;
+	}
+	
+	/* obtain ticket & session key */
+	ZERO_STRUCT(creds);
+	if ((retval = krb5_copy_principal(context, server, &creds.server))) {
+		DEBUG(1,("krb5_copy_principal failed (%s)\n", 
+			 error_message(retval)));
+		goto cleanup_princ;
+	}
+	
+	if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
+		/* This can commonly fail on smbd startup with no ticket in the cache.
+		 * Report at higher level than 1. */
+		DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n", 
+			 error_message(retval)));
+		goto cleanup_creds;
+	}
+
+	while(!creds_ready) {
+		if ((retval = krb5_get_credentials(context, 0, ccache, 
+						   &creds, &credsp))) {
+			DEBUG(1,("ads_krb5_mk_req: krb5_get_credentials failed for %s (%s)\n",
+				 principal, error_message(retval)));
+			goto cleanup_creds;
+		}
+
+		/* cope with ticket being in the future due to clock skew */
+		if ((unsigned)credsp->times.starttime > time(NULL)) {
+			time_t t = time(NULL);
+			int time_offset =(unsigned)credsp->times.starttime-t;
+			DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
+			krb5_set_real_time(context, t + time_offset + 1, 0);
+		}
+
+		if (!ads_cleanup_expired_creds(context, ccache, credsp))
+			creds_ready = True;
+	}
+
+	mem_ctx = talloc_init("ticket expied time");
+	if (!mem_ctx) {
+		retval = ENOMEM;
+		goto cleanup_creds;
+	}
+	DEBUG(10,("Ticket (%s) in ccache (%s) is valid until: (%s - %d)\n",
+		  principal, krb5_cc_default_name(context),
+		  http_timestring(mem_ctx, (unsigned)credsp->times.endtime), 
+		  (unsigned)credsp->times.endtime));
+	
+	in_data.length = 0;
+	retval = krb5_mk_req_extended(context, auth_context, ap_req_options, 
+				      &in_data, credsp, outbuf);
+	if (retval) {
+		DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n", 
+			 error_message(retval)));
+	}
+	
+	krb5_free_creds(context, credsp);
+
+cleanup_creds:
+	krb5_free_cred_contents(context, &creds);
+
+cleanup_princ:
+	krb5_free_principal(context, server);
+
+	return retval;
+}
+
+#if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
+ const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
+{
+	static krb5_data kdata;
+
+	kdata.data = discard_const(krb5_principal_get_comp_string(context, principal, i));
+	kdata.length = strlen(kdata.data);
+	return &kdata;
+}
+#endif
+
+ krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
+{
+#if defined(HAVE_KRB5_KT_FREE_ENTRY)
+	return krb5_kt_free_entry(context, kt_entry);
+#elif defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
+	return krb5_free_keytab_entry_contents(context, kt_entry);
+#else
+#error UNKNOWN_KT_FREE_FUNCTION
+#endif
+}
+
+ char *smb_get_krb5_error_message(krb5_context context, krb5_error_code code, TALLOC_CTX *mem_ctx) 
+{
+	char *ret;
+	
+#if defined(HAVE_KRB5_GET_ERROR_STRING) && defined(HAVE_KRB5_FREE_ERROR_STRING) 	
+	char *context_error = krb5_get_error_string(context);
+	ret = talloc_asprintf(mem_ctx, "%s: %s", error_message(code), context_error);
+	krb5_free_error_string(context, context_error);
+#else 
+	ret = talloc_strdup(mem_ctx, error_message(code));
+#endif
+	return ret;
+}
+
+#endif