/* $NetBSD: rd_req.c,v 1.2.22.1 2023/08/11 13:40:01 martin Exp $ */ /* * 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; 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; 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 = _krb5_principalname2krb5_principal(context, &t->client, t->ticket.cname, t->ticket.crealm); 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; } } /* check addresses */ if (t->ticket.caddr && ac->remote_address && !krb5_address_search (context, ac->remote_address, t->ticket.caddr)) { ret = KRB5KRB_AP_ERR_BADADDR; krb5_clear_error_message (context); goto out; } /* check timestamp in authenticator */ { krb5_timestamp now; krb5_timeofday (context, &now); if (labs(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 != (krb5_enctype)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); 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; *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; } /* 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); krb5_pac_free(context, pac); if (ret) goto out; } 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; }