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-rw-r--r--third_party/heimdal/lib/krb5/rd_req.c1108
1 files changed, 1108 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/krb5/rd_req.c b/third_party/heimdal/lib/krb5/rd_req.c
new file mode 100644
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--- /dev/null
+++ b/third_party/heimdal/lib/krb5/rd_req.c
@@ -0,0 +1,1108 @@
+
+/*
+ * Copyright (c) 1997 - 2007 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * 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.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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 "krb5_locl.h"
+
+static krb5_error_code
+decrypt_tkt_enc_part (krb5_context context,
+ krb5_keyblock *key,
+ EncryptedData *enc_part,
+ EncTicketPart *decr_part)
+{
+ krb5_error_code ret;
+ krb5_data plain;
+ size_t len;
+ krb5_crypto crypto;
+
+ ret = krb5_crypto_init(context, key, 0, &crypto);
+ if (ret)
+ return ret;
+ ret = krb5_decrypt_EncryptedData (context,
+ crypto,
+ KRB5_KU_TICKET,
+ enc_part,
+ &plain);
+ krb5_crypto_destroy(context, crypto);
+ if (ret)
+ return ret;
+
+ ret = decode_EncTicketPart(plain.data, plain.length, decr_part, &len);
+ if (ret)
+ krb5_set_error_message(context, ret,
+ N_("Failed to decode encrypted "
+ "ticket part", ""));
+ krb5_data_free (&plain);
+ return ret;
+}
+
+static krb5_error_code
+decrypt_authenticator (krb5_context context,
+ EncryptionKey *key,
+ EncryptedData *enc_part,
+ Authenticator *authenticator,
+ krb5_key_usage usage)
+{
+ krb5_error_code ret;
+ krb5_data plain;
+ size_t len;
+ krb5_crypto crypto;
+
+ ret = krb5_crypto_init(context, key, 0, &crypto);
+ if (ret)
+ return ret;
+ ret = krb5_decrypt_EncryptedData (context,
+ crypto,
+ usage /* KRB5_KU_AP_REQ_AUTH */,
+ enc_part,
+ &plain);
+ /* for backwards compatibility, also try the old usage */
+ if (ret && usage == KRB5_KU_TGS_REQ_AUTH)
+ ret = krb5_decrypt_EncryptedData (context,
+ crypto,
+ KRB5_KU_AP_REQ_AUTH,
+ enc_part,
+ &plain);
+ krb5_crypto_destroy(context, crypto);
+ if (ret)
+ return ret;
+
+ ret = decode_Authenticator(plain.data, plain.length,
+ authenticator, &len);
+ krb5_data_free (&plain);
+ return ret;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_decode_ap_req(krb5_context context,
+ const krb5_data *inbuf,
+ krb5_ap_req *ap_req)
+{
+ krb5_error_code ret;
+ size_t len;
+ ret = decode_AP_REQ(inbuf->data, inbuf->length, ap_req, &len);
+ if (ret)
+ return ret;
+ if (ap_req->pvno != 5){
+ free_AP_REQ(ap_req);
+ krb5_clear_error_message (context);
+ return KRB5KRB_AP_ERR_BADVERSION;
+ }
+ if (ap_req->msg_type != krb_ap_req){
+ free_AP_REQ(ap_req);
+ krb5_clear_error_message (context);
+ return KRB5KRB_AP_ERR_MSG_TYPE;
+ }
+ if (ap_req->ticket.tkt_vno != 5){
+ free_AP_REQ(ap_req);
+ krb5_clear_error_message (context);
+ return KRB5KRB_AP_ERR_BADVERSION;
+ }
+ return 0;
+}
+
+static krb5_error_code
+check_transited(krb5_context context, Ticket *ticket, EncTicketPart *enc)
+{
+ char **realms;
+ unsigned int num_realms, n;
+ krb5_error_code ret;
+
+ /*
+ * Windows 2000 and 2003 uses this inside their TGT so it's normaly
+ * not seen by others, however, samba4 joined with a Windows AD as
+ * a Domain Controller gets exposed to this.
+ */
+ if(enc->transited.tr_type == 0 && enc->transited.contents.length == 0)
+ return 0;
+
+ if(enc->transited.tr_type != domain_X500_Compress)
+ return KRB5KDC_ERR_TRTYPE_NOSUPP;
+
+ if(enc->transited.contents.length == 0)
+ return 0;
+
+ ret = krb5_domain_x500_decode(context, enc->transited.contents,
+ &realms, &num_realms,
+ enc->crealm,
+ ticket->realm);
+ if(ret)
+ return ret;
+ ret = krb5_check_transited(context, enc->crealm,
+ ticket->realm,
+ realms, num_realms, NULL);
+ for (n = 0; n < num_realms; n++)
+ free(realms[n]);
+ free(realms);
+ return ret;
+}
+
+static krb5_error_code
+find_etypelist(krb5_context context,
+ krb5_auth_context auth_context,
+ EtypeList *etypes)
+{
+ krb5_error_code ret;
+ krb5_data data;
+
+ ret = _krb5_get_ad(context, auth_context->authenticator->authorization_data, NULL, KRB5_AUTHDATA_GSS_API_ETYPE_NEGOTIATION, &data);
+ if (ret)
+ return 0;
+
+ ret = decode_EtypeList(data.data, data.length, etypes, NULL);
+ krb5_data_free(&data);
+ if (ret)
+ krb5_clear_error_message(context);
+
+ return ret;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_decrypt_ticket(krb5_context context,
+ Ticket *ticket,
+ krb5_keyblock *key,
+ EncTicketPart *out,
+ krb5_flags flags)
+{
+ EncTicketPart t;
+ krb5_error_code ret;
+ ret = decrypt_tkt_enc_part (context, key, &ticket->enc_part, &t);
+ if (ret)
+ return ret;
+
+ {
+ krb5_timestamp now;
+ time_t start = t.authtime;
+
+ krb5_timeofday (context, &now);
+ if(t.starttime)
+ start = *t.starttime;
+ if(start - now > context->max_skew
+ || (t.flags.invalid
+ && !(flags & KRB5_VERIFY_AP_REQ_IGNORE_INVALID))) {
+ free_EncTicketPart(&t);
+ krb5_clear_error_message (context);
+ return KRB5KRB_AP_ERR_TKT_NYV;
+ }
+ if(now - t.endtime > context->max_skew) {
+ free_EncTicketPart(&t);
+ krb5_clear_error_message (context);
+ return KRB5KRB_AP_ERR_TKT_EXPIRED;
+ }
+
+ if(!t.flags.transited_policy_checked) {
+ ret = check_transited(context, ticket, &t);
+ if(ret) {
+ free_EncTicketPart(&t);
+ return ret;
+ }
+ }
+ }
+
+ if(out)
+ *out = t;
+ else
+ free_EncTicketPart(&t);
+ return 0;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_verify_authenticator_checksum(krb5_context context,
+ krb5_auth_context ac,
+ void *data,
+ size_t len)
+{
+ krb5_error_code ret;
+ krb5_keyblock *key = NULL;
+ krb5_authenticator authenticator;
+ krb5_crypto crypto;
+
+ ret = krb5_auth_con_getauthenticator(context, ac, &authenticator);
+ if (ret)
+ return ret;
+ if (authenticator->cksum == NULL) {
+ ret = -17;
+ goto out;
+ }
+ ret = krb5_auth_con_getkey(context, ac, &key);
+ if (ret)
+ goto out;
+ ret = krb5_crypto_init(context, key, 0, &crypto);
+ if (ret)
+ goto out;
+
+ _krb5_crypto_set_flags(context, crypto, KRB5_CRYPTO_FLAG_ALLOW_UNKEYED_CHECKSUM);
+ ret = krb5_verify_checksum(context, crypto,
+ KRB5_KU_AP_REQ_AUTH_CKSUM,
+ data, len, authenticator->cksum);
+ krb5_crypto_destroy(context, crypto);
+out:
+ krb5_free_authenticator(context, &authenticator);
+ krb5_free_keyblock(context, key);
+ return ret;
+}
+
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_verify_ap_req(krb5_context context,
+ krb5_auth_context *auth_context,
+ krb5_ap_req *ap_req,
+ krb5_const_principal server,
+ krb5_keyblock *keyblock,
+ krb5_flags flags,
+ krb5_flags *ap_req_options,
+ krb5_ticket **ticket)
+{
+ return krb5_verify_ap_req2 (context,
+ auth_context,
+ ap_req,
+ server,
+ keyblock,
+ flags,
+ ap_req_options,
+ ticket,
+ KRB5_KU_AP_REQ_AUTH);
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_verify_ap_req2(krb5_context context,
+ krb5_auth_context *auth_context,
+ krb5_ap_req *ap_req,
+ krb5_const_principal server,
+ krb5_keyblock *keyblock,
+ krb5_flags flags,
+ krb5_flags *ap_req_options,
+ krb5_ticket **ticket,
+ krb5_key_usage usage)
+{
+ krb5_ticket *t;
+ krb5_auth_context ac;
+ krb5_error_code ret;
+ EtypeList etypes;
+ int badaddr = 0;
+
+ memset(&etypes, 0, sizeof(etypes));
+
+ if (ticket)
+ *ticket = NULL;
+
+ if (auth_context && *auth_context) {
+ ac = *auth_context;
+ } else {
+ ret = krb5_auth_con_init (context, &ac);
+ if (ret)
+ return ret;
+ }
+
+ t = calloc(1, sizeof(*t));
+ if (t == NULL) {
+ ret = krb5_enomem(context);
+ goto out;
+ }
+
+ if (ap_req->ap_options.use_session_key && ac->keyblock){
+ ret = krb5_decrypt_ticket(context, &ap_req->ticket,
+ ac->keyblock,
+ &t->ticket,
+ flags);
+ krb5_free_keyblock(context, ac->keyblock);
+ ac->keyblock = NULL;
+ }else
+ ret = krb5_decrypt_ticket(context, &ap_req->ticket,
+ keyblock,
+ &t->ticket,
+ flags);
+
+ if(ret)
+ goto out;
+
+ ret = _krb5_principalname2krb5_principal(context,
+ &t->server,
+ ap_req->ticket.sname,
+ ap_req->ticket.realm);
+ if (ret) goto out;
+
+ ret = decrypt_authenticator (context,
+ &t->ticket.key,
+ &ap_req->authenticator,
+ ac->authenticator,
+ usage);
+ if (ret)
+ goto out;
+
+ {
+ krb5_principal p1, p2;
+ krb5_boolean res;
+
+ _krb5_principalname2krb5_principal(context,
+ &p1,
+ ac->authenticator->cname,
+ ac->authenticator->crealm);
+ _krb5_principalname2krb5_principal(context,
+ &p2,
+ t->ticket.cname,
+ t->ticket.crealm);
+ res = krb5_principal_compare (context, p1, p2);
+ krb5_free_principal (context, p1);
+ krb5_free_principal (context, p2);
+ if (!res) {
+ ret = KRB5KRB_AP_ERR_BADMATCH;
+ krb5_clear_error_message (context);
+ goto out;
+ }
+ }
+
+ /*
+ * The ticket authenticates the client, and conveys naming attributes that
+ * we want to expose in GSS using RFC6680 APIs.
+ *
+ * So we same the ticket enc-part in the client's krb5_principal object
+ * (note though that the session key will be absent in that copy of the
+ * ticket enc-part).
+ */
+ ret = _krb5_ticket2krb5_principal(context, &t->client, &t->ticket,
+ ac->authenticator->authorization_data);
+ if (ret) goto out;
+
+ t->client->nameattrs->peer_realm =
+ calloc(1, sizeof(t->client->nameattrs->peer_realm[0]));
+ if (t->client->nameattrs->peer_realm == NULL) {
+ ret = krb5_enomem(context);
+ goto out;
+ }
+ ret = copy_Realm(&ap_req->ticket.realm, t->client->nameattrs->peer_realm);
+ if (ret) goto out;
+
+ /* check addresses */
+
+ if (t->ticket.caddr
+ && ac->remote_address
+ && !krb5_address_search (context,
+ ac->remote_address,
+ t->ticket.caddr)) {
+ /*
+ * Hack alert. If KRB5_VERIFY_AP_REQ_IGNORE_ADDRS and the client's
+ * address didn't check out then we'll return KRB5KRB_AP_ERR_BADADDR
+ * even on success, and we'll let the caller figure it out because
+ * `*ticket != NULL' or `*auth_context != NULL'.
+ */
+ if ((flags & KRB5_VERIFY_AP_REQ_IGNORE_ADDRS)) {
+ badaddr = 1;
+ } else {
+ ret = KRB5KRB_AP_ERR_BADADDR;
+ krb5_clear_error_message(context);
+ goto out;
+ }
+ }
+
+ /* check timestamp in authenticator */
+ {
+ krb5_timestamp now;
+
+ krb5_timeofday (context, &now);
+
+ if (krb5_time_abs(ac->authenticator->ctime, now) > context->max_skew) {
+ ret = KRB5KRB_AP_ERR_SKEW;
+ krb5_clear_error_message (context);
+ goto out;
+ }
+ }
+
+ if (ac->authenticator->seq_number)
+ krb5_auth_con_setremoteseqnumber(context, ac,
+ *ac->authenticator->seq_number);
+
+ /* XXX - Xor sequence numbers */
+
+ if (ac->authenticator->subkey) {
+ ret = krb5_auth_con_setremotesubkey(context, ac,
+ ac->authenticator->subkey);
+ if (ret)
+ goto out;
+ }
+
+ ret = find_etypelist(context, ac, &etypes);
+ if (ret)
+ goto out;
+
+ ac->keytype = ETYPE_NULL;
+
+ if (etypes.val) {
+ size_t i;
+
+ for (i = 0; i < etypes.len; i++) {
+ if (krb5_enctype_valid(context, etypes.val[i]) == 0) {
+ ac->keytype = etypes.val[i];
+ break;
+ }
+ }
+ }
+
+ /* save key */
+ ret = krb5_copy_keyblock(context, &t->ticket.key, &ac->keyblock);
+ if (ret) goto out;
+
+ if (ap_req_options) {
+ *ap_req_options = 0;
+ if (ac->keytype != ETYPE_NULL)
+ *ap_req_options |= AP_OPTS_USE_SUBKEY;
+ if (ap_req->ap_options.use_session_key)
+ *ap_req_options |= AP_OPTS_USE_SESSION_KEY;
+ if (ap_req->ap_options.mutual_required)
+ *ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
+ }
+
+ if(ticket)
+ *ticket = t;
+ else
+ krb5_free_ticket (context, t);
+ if (auth_context) {
+ if (*auth_context == NULL)
+ *auth_context = ac;
+ } else
+ krb5_auth_con_free (context, ac);
+ free_EtypeList(&etypes);
+
+ if (badaddr) {
+ krb5_clear_error_message(context);
+ return KRB5KRB_AP_ERR_BADADDR;
+ }
+ return 0;
+ out:
+ free_EtypeList(&etypes);
+ if (t)
+ krb5_free_ticket (context, t);
+ if (auth_context == NULL || *auth_context == NULL)
+ krb5_auth_con_free (context, ac);
+ return ret;
+}
+
+/*
+ *
+ */
+
+struct krb5_rd_req_in_ctx_data {
+ krb5_keytab keytab;
+ krb5_keyblock *keyblock;
+ krb5_boolean check_pac;
+};
+
+struct krb5_rd_req_out_ctx_data {
+ krb5_keyblock *keyblock;
+ krb5_flags ap_req_options;
+ krb5_ticket *ticket;
+ krb5_principal server;
+};
+
+/**
+ * Allocate a krb5_rd_req_in_ctx as an input parameter to
+ * krb5_rd_req_ctx(). The caller should free the context with
+ * krb5_rd_req_in_ctx_free() when done with the context.
+ *
+ * @param context Keberos 5 context.
+ * @param ctx in ctx to krb5_rd_req_ctx().
+ *
+ * @return Kerberos 5 error code, see krb5_get_error_message().
+ *
+ * @ingroup krb5_auth
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_rd_req_in_ctx_alloc(krb5_context context, krb5_rd_req_in_ctx *ctx)
+{
+ *ctx = calloc(1, sizeof(**ctx));
+ if (*ctx == NULL)
+ return krb5_enomem(context);
+ (*ctx)->check_pac = (context->flags & KRB5_CTX_F_CHECK_PAC) ? 1 : 0;
+ return 0;
+}
+
+/**
+ * Set the keytab that krb5_rd_req_ctx() will use.
+ *
+ * @param context Keberos 5 context.
+ * @param in in ctx to krb5_rd_req_ctx().
+ * @param keytab keytab that krb5_rd_req_ctx() will use, only copy the
+ * pointer, so the caller must free they keytab after
+ * krb5_rd_req_in_ctx_free() is called.
+ *
+ * @return Kerberos 5 error code, see krb5_get_error_message().
+ *
+ * @ingroup krb5_auth
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_rd_req_in_set_keytab(krb5_context context,
+ krb5_rd_req_in_ctx in,
+ krb5_keytab keytab)
+{
+ in->keytab = keytab;
+ return 0;
+}
+
+/**
+ * Set if krb5_rq_red() is going to check the Windows PAC or not
+ *
+ * @param context Keberos 5 context.
+ * @param in krb5_rd_req_in_ctx to check the option on.
+ * @param flag flag to select if to check the pac (TRUE) or not (FALSE).
+ *
+ * @return Kerberos 5 error code, see krb5_get_error_message().
+ *
+ * @ingroup krb5_auth
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_rd_req_in_set_pac_check(krb5_context context,
+ krb5_rd_req_in_ctx in,
+ krb5_boolean flag)
+{
+ in->check_pac = flag;
+ return 0;
+}
+
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_rd_req_in_set_keyblock(krb5_context context,
+ krb5_rd_req_in_ctx in,
+ krb5_keyblock *keyblock)
+{
+ in->keyblock = keyblock; /* XXX should make copy */
+ return 0;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_rd_req_out_get_ap_req_options(krb5_context context,
+ krb5_rd_req_out_ctx out,
+ krb5_flags *ap_req_options)
+{
+ *ap_req_options = out->ap_req_options;
+ return 0;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_rd_req_out_get_ticket(krb5_context context,
+ krb5_rd_req_out_ctx out,
+ krb5_ticket **ticket)
+{
+ return krb5_copy_ticket(context, out->ticket, ticket);
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_rd_req_out_get_keyblock(krb5_context context,
+ krb5_rd_req_out_ctx out,
+ krb5_keyblock **keyblock)
+{
+ return krb5_copy_keyblock(context, out->keyblock, keyblock);
+}
+
+/**
+ * Get the principal that was used in the request from the
+ * client. Might not match whats in the ticket if krb5_rd_req_ctx()
+ * searched in the keytab for a matching key.
+ *
+ * @param context a Kerberos 5 context.
+ * @param out a krb5_rd_req_out_ctx from krb5_rd_req_ctx().
+ * @param principal return principal, free with krb5_free_principal().
+ *
+ * @ingroup krb5_auth
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_rd_req_out_get_server(krb5_context context,
+ krb5_rd_req_out_ctx out,
+ krb5_principal *principal)
+{
+ return krb5_copy_principal(context, out->server, principal);
+}
+
+KRB5_LIB_FUNCTION void KRB5_LIB_CALL
+krb5_rd_req_in_ctx_free(krb5_context context, krb5_rd_req_in_ctx ctx)
+{
+ free(ctx);
+}
+
+/**
+ * Free the krb5_rd_req_out_ctx.
+ *
+ * @param context Keberos 5 context.
+ * @param ctx krb5_rd_req_out_ctx context to free.
+ *
+ * @ingroup krb5_auth
+ */
+
+KRB5_LIB_FUNCTION void KRB5_LIB_CALL
+krb5_rd_req_out_ctx_free(krb5_context context, krb5_rd_req_out_ctx ctx)
+{
+ if (ctx->ticket)
+ krb5_free_ticket(context, ctx->ticket);
+ if (ctx->keyblock)
+ krb5_free_keyblock(context, ctx->keyblock);
+ if (ctx->server)
+ krb5_free_principal(context, ctx->server);
+ free(ctx);
+}
+
+/**
+ * Process an AP_REQ message.
+ *
+ * @param context Kerberos 5 context.
+ * @param auth_context authentication context of the peer.
+ * @param inbuf the AP_REQ message, obtained for example with krb5_read_message().
+ * @param server server principal.
+ * @param keytab server keytab.
+ * @param ap_req_options set to the AP_REQ options. See the AP_OPTS_* defines.
+ * @param ticket on success, set to the authenticated client credentials.
+ * Must be deallocated with krb5_free_ticket(). If not
+ * interested, pass a NULL value.
+ *
+ * @return 0 to indicate success. Otherwise a Kerberos error code is
+ * returned, see krb5_get_error_message().
+ */
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_rd_req(krb5_context context,
+ krb5_auth_context *auth_context,
+ const krb5_data *inbuf,
+ krb5_const_principal server,
+ krb5_keytab keytab,
+ krb5_flags *ap_req_options,
+ krb5_ticket **ticket)
+{
+ krb5_error_code ret;
+ krb5_rd_req_in_ctx in;
+ krb5_rd_req_out_ctx out;
+
+ ret = krb5_rd_req_in_ctx_alloc(context, &in);
+ if (ret)
+ return ret;
+
+ ret = krb5_rd_req_in_set_keytab(context, in, keytab);
+ if (ret) {
+ krb5_rd_req_in_ctx_free(context, in);
+ return ret;
+ }
+
+ ret = krb5_rd_req_ctx(context, auth_context, inbuf, server, in, &out);
+ krb5_rd_req_in_ctx_free(context, in);
+ if (ret)
+ return ret;
+
+ if (ap_req_options)
+ *ap_req_options = out->ap_req_options;
+ if (ticket) {
+ ret = krb5_copy_ticket(context, out->ticket, ticket);
+ if (ret)
+ goto out;
+ }
+
+out:
+ krb5_rd_req_out_ctx_free(context, out);
+ return ret;
+}
+
+/*
+ *
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_rd_req_with_keyblock(krb5_context context,
+ krb5_auth_context *auth_context,
+ const krb5_data *inbuf,
+ krb5_const_principal server,
+ krb5_keyblock *keyblock,
+ krb5_flags *ap_req_options,
+ krb5_ticket **ticket)
+{
+ krb5_error_code ret;
+ krb5_rd_req_in_ctx in;
+ krb5_rd_req_out_ctx out;
+
+ ret = krb5_rd_req_in_ctx_alloc(context, &in);
+ if (ret)
+ return ret;
+
+ ret = krb5_rd_req_in_set_keyblock(context, in, keyblock);
+ if (ret) {
+ krb5_rd_req_in_ctx_free(context, in);
+ return ret;
+ }
+
+ ret = krb5_rd_req_ctx(context, auth_context, inbuf, server, in, &out);
+ krb5_rd_req_in_ctx_free(context, in);
+ if (ret)
+ return ret;
+
+ if (ap_req_options)
+ *ap_req_options = out->ap_req_options;
+ if (ticket) {
+ ret = krb5_copy_ticket(context, out->ticket, ticket);
+ if (ret)
+ goto out;
+ }
+
+out:
+ krb5_rd_req_out_ctx_free(context, out);
+ return ret;
+}
+
+/*
+ *
+ */
+
+static krb5_error_code
+get_key_from_keytab(krb5_context context,
+ krb5_ap_req *ap_req,
+ krb5_const_principal server,
+ krb5_keytab keytab,
+ krb5_keyblock **out_key)
+{
+ krb5_keytab_entry entry;
+ krb5_error_code ret;
+ int kvno;
+ krb5_keytab real_keytab;
+
+ if(keytab == NULL)
+ krb5_kt_default(context, &real_keytab);
+ else
+ real_keytab = keytab;
+
+ if (ap_req->ticket.enc_part.kvno)
+ kvno = *ap_req->ticket.enc_part.kvno;
+ else
+ kvno = 0;
+
+ ret = krb5_kt_get_entry (context,
+ real_keytab,
+ server,
+ kvno,
+ ap_req->ticket.enc_part.etype,
+ &entry);
+ if(ret == 0) {
+ ret = krb5_copy_keyblock(context, &entry.keyblock, out_key);
+ krb5_kt_free_entry(context, &entry);
+ }
+ if(keytab == NULL)
+ krb5_kt_close(context, real_keytab);
+
+ return ret;
+}
+
+/**
+ * The core server function that verify application authentication
+ * requests from clients.
+ *
+ * @param context Keberos 5 context.
+ * @param auth_context the authentication context, can be NULL, then
+ * default values for the authentication context will used.
+ * @param inbuf the (AP-REQ) authentication buffer
+ *
+ * @param server the server to authenticate to. If NULL the function
+ * will try to find any available credential in the keytab
+ * that will verify the reply. The function will prefer the
+ * server specified in the AP-REQ, but if
+ * there is no mach, it will try all keytab entries for a
+ * match. This has serious performance issues for large keytabs.
+ *
+ * @param inctx control the behavior of the function, if NULL, the
+ * default behavior is used.
+ * @param outctx the return outctx, free with krb5_rd_req_out_ctx_free().
+ * @return Kerberos 5 error code, see krb5_get_error_message().
+ *
+ * @ingroup krb5_auth
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_rd_req_ctx(krb5_context context,
+ krb5_auth_context *auth_context,
+ const krb5_data *inbuf,
+ krb5_const_principal server,
+ krb5_rd_req_in_ctx inctx,
+ krb5_rd_req_out_ctx *outctx)
+{
+ krb5_error_code ret;
+ krb5_ap_req ap_req;
+ krb5_rd_req_out_ctx o = NULL;
+ krb5_keytab id = NULL, keytab = NULL;
+ krb5_principal service = NULL;
+
+ if (outctx)
+ *outctx = NULL;
+
+ o = calloc(1, sizeof(*o));
+ if (o == NULL)
+ return krb5_enomem(context);
+
+ if (*auth_context == NULL) {
+ ret = krb5_auth_con_init(context, auth_context);
+ if (ret)
+ goto out;
+ }
+
+ ret = krb5_decode_ap_req(context, inbuf, &ap_req);
+ if(ret)
+ goto out;
+
+ /* Save the principal that was in the request */
+ ret = _krb5_principalname2krb5_principal(context,
+ &o->server,
+ ap_req.ticket.sname,
+ ap_req.ticket.realm);
+ if (ret)
+ goto out;
+
+ if (ap_req.ap_options.use_session_key &&
+ (*auth_context)->keyblock == NULL) {
+ ret = KRB5KRB_AP_ERR_NOKEY;
+ krb5_set_error_message(context, ret,
+ N_("krb5_rd_req: user to user auth "
+ "without session key given", ""));
+ goto out;
+ }
+
+ if (inctx && inctx->keytab)
+ id = inctx->keytab;
+
+ if((*auth_context)->keyblock){
+ ret = krb5_copy_keyblock(context,
+ (*auth_context)->keyblock,
+ &o->keyblock);
+ if (ret)
+ goto out;
+ } else if(inctx && inctx->keyblock){
+ ret = krb5_copy_keyblock(context,
+ inctx->keyblock,
+ &o->keyblock);
+ if (ret)
+ goto out;
+ } else {
+
+ if(id == NULL) {
+ krb5_kt_default(context, &keytab);
+ id = keytab;
+ }
+ if (id == NULL)
+ goto out;
+
+ if (server == NULL) {
+ ret = _krb5_principalname2krb5_principal(context,
+ &service,
+ ap_req.ticket.sname,
+ ap_req.ticket.realm);
+ if (ret)
+ goto out;
+ server = service;
+ }
+
+ ret = get_key_from_keytab(context,
+ &ap_req,
+ server,
+ id,
+ &o->keyblock);
+ if (ret) {
+ /* If caller specified a server, fail. */
+ if (service == NULL && (context->flags & KRB5_CTX_F_RD_REQ_IGNORE) == 0)
+ goto out;
+ /* Otherwise, fall back to iterating over the keytab. This
+ * have serious performace issues for larger keytab.
+ */
+ o->keyblock = NULL;
+ }
+ }
+
+ if (o->keyblock) {
+ /*
+ * We got an exact keymatch, use that.
+ */
+
+ ret = krb5_verify_ap_req2(context,
+ auth_context,
+ &ap_req,
+ server,
+ o->keyblock,
+ 0,
+ &o->ap_req_options,
+ &o->ticket,
+ KRB5_KU_AP_REQ_AUTH);
+
+ if (ret)
+ goto out;
+
+ } else {
+ /*
+ * Interate over keytab to find a key that can decrypt the request.
+ */
+
+ krb5_keytab_entry entry;
+ krb5_kt_cursor cursor;
+ int done = 0, kvno = 0;
+
+ memset(&cursor, 0, sizeof(cursor));
+
+ if (ap_req.ticket.enc_part.kvno)
+ kvno = *ap_req.ticket.enc_part.kvno;
+
+ ret = krb5_kt_start_seq_get(context, id, &cursor);
+ if (ret)
+ goto out;
+
+ done = 0;
+ while (!done) {
+ krb5_principal p;
+
+ ret = krb5_kt_next_entry(context, id, &entry, &cursor);
+ if (ret) {
+ _krb5_kt_principal_not_found(context, ret, id, o->server,
+ ap_req.ticket.enc_part.etype,
+ kvno);
+ break;
+ }
+
+ if (entry.keyblock.keytype != ap_req.ticket.enc_part.etype) {
+ krb5_kt_free_entry (context, &entry);
+ continue;
+ }
+
+ ret = krb5_verify_ap_req2(context,
+ auth_context,
+ &ap_req,
+ server,
+ &entry.keyblock,
+ 0,
+ &o->ap_req_options,
+ &o->ticket,
+ KRB5_KU_AP_REQ_AUTH);
+ if (ret) {
+ krb5_kt_free_entry (context, &entry);
+ continue;
+ }
+
+ /*
+ * Found a match, save the keyblock for PAC processing,
+ * and update the service principal in the ticket to match
+ * whatever is in the keytab.
+ */
+
+ ret = krb5_copy_keyblock(context,
+ &entry.keyblock,
+ &o->keyblock);
+ if (ret) {
+ krb5_kt_free_entry (context, &entry);
+ break;
+ }
+
+ ret = krb5_copy_principal(context, entry.principal, &p);
+ if (ret) {
+ krb5_kt_free_entry (context, &entry);
+ break;
+ }
+ krb5_free_principal(context, o->ticket->server);
+ o->ticket->server = p;
+
+ krb5_kt_free_entry (context, &entry);
+
+ done = 1;
+ }
+ krb5_kt_end_seq_get (context, id, &cursor);
+ if (ret)
+ goto out;
+ }
+
+ ret = krb5_ticket_get_authorization_data_type(context, o->ticket,
+ KRB5_AUTHDATA_KDC_ISSUED,
+ NULL);
+ if (ret == 0)
+ o->ticket->client->nameattrs->kdc_issued_verified = 1;
+
+ /* If there is a PAC, verify its server signature */
+ if (inctx == NULL || inctx->check_pac) {
+ krb5_pac pac;
+ krb5_data data;
+
+ ret = krb5_ticket_get_authorization_data_type(context,
+ o->ticket,
+ KRB5_AUTHDATA_WIN2K_PAC,
+ &data);
+ if (ret == 0) {
+ ret = krb5_pac_parse(context, data.data, data.length, &pac);
+ krb5_data_free(&data);
+ if (ret)
+ goto out;
+
+ ret = krb5_pac_verify(context,
+ pac,
+ o->ticket->ticket.authtime,
+ o->ticket->client,
+ o->keyblock,
+ NULL);
+ if (ret == 0)
+ o->ticket->client->nameattrs->pac_verified = 1;
+ if (ret == 0 && (context->flags & KRB5_CTX_F_REPORT_CANONICAL_CLIENT_NAME)) {
+ krb5_error_code ret2;
+ krb5_principal canon_name;
+
+ ret2 = _krb5_pac_get_canon_principal(context, pac, &canon_name);
+ if (ret2 == 0) {
+ free_Realm(&o->ticket->client->realm);
+ free_PrincipalName(&o->ticket->client->name);
+ ret = copy_Realm(&canon_name->realm, &o->ticket->client->realm);
+ if (ret == 0)
+ ret = copy_PrincipalName(&canon_name->name, &o->ticket->client->name);
+ krb5_free_principal(context, canon_name);
+ } else if (ret2 != ENOENT)
+ ret = ret2;
+ }
+ if (ret) {
+ krb5_pac_free(context, pac);
+ goto out;
+ }
+ o->ticket->client->nameattrs->pac = pac;
+ } else
+ ret = 0;
+ }
+out:
+
+ if (ret || outctx == NULL)
+ krb5_rd_req_out_ctx_free(context, o);
+ else
+ *outctx = o;
+
+ free_AP_REQ(&ap_req);
+
+ if (service)
+ krb5_free_principal(context, service);
+
+ if (keytab)
+ krb5_kt_close(context, keytab);
+
+ return ret;
+}