diff options
Diffstat (limited to 'source4/heimdal/kdc/kerberos5.c')
| -rw-r--r-- | source4/heimdal/kdc/kerberos5.c | 1337 |
1 files changed, 146 insertions, 1191 deletions
diff --git a/source4/heimdal/kdc/kerberos5.c b/source4/heimdal/kdc/kerberos5.c index a73c2c10b3..19287b31cc 100644 --- a/source4/heimdal/kdc/kerberos5.c +++ b/source4/heimdal/kdc/kerberos5.c @@ -33,12 +33,12 @@ #include "kdc_locl.h" -RCSID("$Id: kerberos5.c,v 1.211 2006/04/27 12:01:09 lha Exp $"); +RCSID("$Id: kerberos5.c,v 1.223 2006/10/17 02:16:29 lha Exp $"); #define MAX_TIME ((time_t)((1U << 31) - 1)) -static void -fix_time(time_t **t) +void +_kdc_fix_time(time_t **t) { if(*t == NULL){ ALLOC(*t); @@ -65,13 +65,13 @@ set_salt_padata (METHOD_DATA *md, Salt *salt) if (salt) { realloc_method_data(md); md->val[md->len - 1].padata_type = salt->type; - copy_octet_string(&salt->salt, - &md->val[md->len - 1].padata_value); + der_copy_octet_string(&salt->salt, + &md->val[md->len - 1].padata_value); } } -static PA_DATA* -find_padata(KDC_REQ *req, int *start, int type) +PA_DATA* +_kdc_find_padata(KDC_REQ *req, int *start, int type) { while(*start < req->padata->len){ (*start)++; @@ -87,10 +87,10 @@ find_padata(KDC_REQ *req, int *start, int type) * one, but preferring one that has default salt */ -static krb5_error_code -find_etype(krb5_context context, const hdb_entry_ex *princ, - krb5_enctype *etypes, unsigned len, - Key **ret_key, krb5_enctype *ret_etype) +krb5_error_code +_kdc_find_etype(krb5_context context, const hdb_entry_ex *princ, + krb5_enctype *etypes, unsigned len, + Key **ret_key, krb5_enctype *ret_etype) { int i; krb5_error_code ret = KRB5KDC_ERR_ETYPE_NOSUPP; @@ -116,46 +116,8 @@ find_etype(krb5_context context, const hdb_entry_ex *princ, return ret; } -static krb5_error_code -find_keys(krb5_context context, - krb5_kdc_configuration *config, - const hdb_entry_ex *client, - const char *client_name, - const hdb_entry_ex *server, - const char *server_name, - Key **ckey, - krb5_enctype *cetype, - Key **skey, - krb5_enctype *setype, - krb5_enctype *etypes, - unsigned num_etypes) -{ - krb5_error_code ret; - - if(client){ - /* find client key */ - ret = find_etype(context, client, etypes, num_etypes, ckey, cetype); - if (ret) { - kdc_log(context, config, 0, - "Client (%s) has no support for etypes", client_name); - return ret; - } - } - - if(server){ - /* find server key */ - ret = find_etype(context, server, etypes, num_etypes, skey, setype); - if (ret) { - kdc_log(context, config, 0, - "Server (%s) has no support for etypes", server_name); - return ret; - } - } - return 0; -} - -static krb5_error_code -make_anonymous_principalname (PrincipalName *pn) +krb5_error_code +_kdc_make_anonymous_principalname (PrincipalName *pn) { pn->name_type = KRB5_NT_PRINCIPAL; pn->name_string.len = 1; @@ -171,12 +133,12 @@ make_anonymous_principalname (PrincipalName *pn) return 0; } -static void -log_timestamp(krb5_context context, - krb5_kdc_configuration *config, - const char *type, - KerberosTime authtime, KerberosTime *starttime, - KerberosTime endtime, KerberosTime *renew_till) +void +_kdc_log_timestamp(krb5_context context, + krb5_kdc_configuration *config, + const char *type, + KerberosTime authtime, KerberosTime *starttime, + KerberosTime endtime, KerberosTime *renew_till) { char authtime_str[100], starttime_str[100], endtime_str[100], renewtime_str[100]; @@ -248,15 +210,15 @@ log_patypes(krb5_context context, */ -static krb5_error_code -encode_reply(krb5_context context, - krb5_kdc_configuration *config, - KDC_REP *rep, EncTicketPart *et, EncKDCRepPart *ek, - krb5_enctype etype, - int skvno, EncryptionKey *skey, - int ckvno, EncryptionKey *ckey, - const char **e_text, - krb5_data *reply) +krb5_error_code +_kdc_encode_reply(krb5_context context, + krb5_kdc_configuration *config, + KDC_REP *rep, const EncTicketPart *et, EncKDCRepPart *ek, + krb5_enctype etype, + int skvno, const EncryptionKey *skey, + int ckvno, const EncryptionKey *ckey, + const char **e_text, + krb5_data *reply) { unsigned char *buf; size_t buf_size; @@ -795,10 +757,10 @@ _kdc_check_flags(krb5_context context, * these checks */ -static krb5_boolean -check_addresses(krb5_context context, - krb5_kdc_configuration *config, - HostAddresses *addresses, const struct sockaddr *from) +krb5_boolean +_kdc_check_addresses(krb5_context context, + krb5_kdc_configuration *config, + HostAddresses *addresses, const struct sockaddr *from) { krb5_error_code ret; krb5_address addr; @@ -843,13 +805,14 @@ _kdc_as_rep(krb5_context context, const krb5_data *req_buffer, krb5_data *reply, const char *from, - struct sockaddr *from_addr) + struct sockaddr *from_addr, + int datagram_reply) { KDC_REQ_BODY *b = &req->req_body; AS_REP rep; KDCOptions f = b->kdc_options; hdb_entry_ex *client = NULL, *server = NULL; - krb5_enctype cetype, setype; + krb5_enctype cetype, setype, sessionetype; EncTicketPart et; EncKDCRepPart ek; krb5_principal client_princ = NULL, server_princ = NULL; @@ -869,12 +832,15 @@ _kdc_as_rep(krb5_context context, ret = KRB5KRB_ERR_GENERIC; e_text = "No server in request"; } else{ - _krb5_principalname2krb5_principal (context, &server_princ, - *(b->sname), b->realm); + _krb5_principalname2krb5_principal (context, + &server_princ, + *(b->sname), + b->realm); ret = krb5_unparse_name(context, server_princ, &server_name); } if (ret) { - kdc_log(context, config, 0, "AS-REQ malformed server name from %s", from); + kdc_log(context, config, 0, + "AS-REQ malformed server name from %s", from); goto out; } @@ -882,12 +848,15 @@ _kdc_as_rep(krb5_context context, ret = KRB5KRB_ERR_GENERIC; e_text = "No client in request"; } else { - _krb5_principalname2krb5_principal (context, &client_princ, - *(b->cname), b->realm); + _krb5_principalname2krb5_principal (context, + &client_princ, + *(b->cname), + b->realm); ret = krb5_unparse_name(context, client_princ, &client_name); } if (ret) { - kdc_log(context, config, 0, "AS-REQ malformed client name from %s", from); + kdc_log(context, config, 0, + "AS-REQ malformed client name from %s", from); goto out; } @@ -895,7 +864,7 @@ _kdc_as_rep(krb5_context context, client_name, from, server_name); ret = _kdc_db_fetch(context, config, client_princ, - HDB_F_GET_CLIENT, &client); + HDB_F_GET_CLIENT, NULL, &client); if(ret){ kdc_log(context, config, 0, "UNKNOWN -- %s: %s", client_name, krb5_get_err_text(context, ret)); @@ -904,7 +873,8 @@ _kdc_as_rep(krb5_context context, } ret = _kdc_db_fetch(context, config, server_princ, - HDB_F_GET_SERVER|HDB_F_GET_KRBTGT, &server); + HDB_F_GET_SERVER|HDB_F_GET_KRBTGT, + NULL, &server); if(ret){ kdc_log(context, config, 0, "UNKNOWN -- %s: %s", server_name, krb5_get_err_text(context, ret)); @@ -943,11 +913,11 @@ _kdc_as_rep(krb5_context context, e_text = "No PKINIT PA found"; i = 0; - if ((pa = find_padata(req, &i, KRB5_PADATA_PK_AS_REQ))) + if ((pa = _kdc_find_padata(req, &i, KRB5_PADATA_PK_AS_REQ))) ; if (pa == NULL) { i = 0; - if((pa = find_padata(req, &i, KRB5_PADATA_PK_AS_REQ_WIN))) + if((pa = _kdc_find_padata(req, &i, KRB5_PADATA_PK_AS_REQ_WIN))) ; } if (pa) { @@ -995,7 +965,7 @@ _kdc_as_rep(krb5_context context, i = 0; e_text = "No ENC-TS found"; - while((pa = find_padata(req, &i, KRB5_PADATA_ENC_TIMESTAMP))){ + while((pa = _kdc_find_padata(req, &i, KRB5_PADATA_ENC_TIMESTAMP))){ krb5_data ts_data; PA_ENC_TS_ENC p; size_t len; @@ -1056,7 +1026,7 @@ _kdc_as_rep(krb5_context context, if(ret){ krb5_error_code ret2; ret2 = krb5_enctype_to_string(context, - pa_key->key.keytype, &str); + pa_key->key.keytype, &str); if (ret2) str = NULL; kdc_log(context, config, 5, @@ -1092,9 +1062,18 @@ _kdc_as_rep(krb5_context context, } free_PA_ENC_TS_ENC(&p); if (abs(kdc_time - p.patimestamp) > context->max_skew) { + char client_time[100]; + + krb5_format_time(context, p.patimestamp, + client_time, sizeof(client_time), TRUE); + ret = KRB5KRB_AP_ERR_SKEW; kdc_log(context, config, 0, - "Too large time skew -- %s", client_name); + "Too large time skew, client time %s is out by %u > %u seconds -- %s", + client_time, + (unsigned)abs(kdc_time - p.patimestamp), + context->max_skew, + client_name); /* * the following is needed to make windows clients * to retry using the timestamp in the error message @@ -1162,7 +1141,7 @@ _kdc_as_rep(krb5_context context, * both info replies (we send 'info' first in the list). * - If the client is 'modern', because it knows about 'new' * enctype types, then only send the 'info2' reply. - */ + */ /* XXX check ret */ if (only_older_enctype_p(req)) @@ -1197,14 +1176,54 @@ _kdc_as_rep(krb5_context context, goto out2; } - ret = find_keys(context, config, - client, client_name, - server, server_name, - &ckey, &cetype, &skey, &setype, - b->etype.val, b->etype.len); - if(ret) + /* + * Find the client key (for preauth ENC-TS verification and reply + * encryption). Then the best encryption type for the KDC and + * last the best session key that shared between the client and + * KDC runtime enctypes. + */ + + ret = _kdc_find_etype(context, client, b->etype.val, b->etype.len, + &ckey, &cetype); + if (ret) { + kdc_log(context, config, 0, + "Client (%s) has no support for etypes", client_name); goto out; + } + ret = _kdc_get_preferred_key(context, config, + server, server_name, + &setype, &skey); + if(ret) + goto out; + + { + const krb5_enctype *p; + int i, j; + + p = krb5_kerberos_enctypes(context); + + sessionetype = ETYPE_NULL; + + for (i = 0; p[i] != ETYPE_NULL && sessionetype == ETYPE_NULL; i++) { + if (krb5_enctype_valid(context, p[i]) != 0) + continue; + for (j = 0; j < b->etype.len; j++) { + if (p[i] == b->etype.val[j]) { + sessionetype = p[i]; + break; + } + } + } + if (sessionetype == ETYPE_NULL) { + kdc_log(context, config, 0, + "Client (%s) from %s has no common enctypes with KDC" + "to use for the session key", + client_name, from); + goto out; + } + } + { struct rk_strpool *p = NULL; char *str; @@ -1268,9 +1287,9 @@ _kdc_as_rep(krb5_context context, rep.msg_type = krb_as_rep; copy_Realm(&client->entry.principal->realm, &rep.crealm); if (f.request_anonymous) - make_anonymous_principalname (&rep.cname); + _kdc_make_anonymous_principalname (&rep.cname); else - _krb5_principal2principalname(&rep.cname, + _krb5_principal2principalname(&rep.cname, client->entry.principal); rep.ticket.tkt_vno = 5; copy_Realm(&server->entry.principal->realm, &rep.ticket.realm); @@ -1304,14 +1323,14 @@ _kdc_as_rep(krb5_context context, } /* check for valid set of addresses */ - if(!check_addresses(context, config, b->addresses, from_addr)) { + if(!_kdc_check_addresses(context, config, b->addresses, from_addr)) { ret = KRB5KRB_AP_ERR_BADADDR; kdc_log(context, config, 0, "Bad address list requested -- %s", client_name); goto out; } - krb5_generate_random_keyblock(context, setype, &et.key); + krb5_generate_random_keyblock(context, sessionetype, &et.key); copy_PrincipalName(&rep.cname, &et.cname); copy_Realm(&rep.crealm, &et.crealm); @@ -1327,7 +1346,7 @@ _kdc_as_rep(krb5_context context, et.flags.invalid = 1; et.flags.postdated = 1; /* XXX ??? */ } - fix_time(&b->till); + _kdc_fix_time(&b->till); t = *b->till; /* be careful not overflowing */ @@ -1392,7 +1411,7 @@ _kdc_as_rep(krb5_context context, ek.last_req.len = 0; if (client->entry.pw_end && (config->kdc_warn_pwexpire == 0 - || kdc_time + config->kdc_warn_pwexpire <= *client->entry.pw_end)) { + || kdc_time + config->kdc_warn_pwexpire >= *client->entry.pw_end)) { ek.last_req.val[ek.last_req.len].lr_type = LR_PW_EXPTIME; ek.last_req.val[ek.last_req.len].lr_value = *client->entry.pw_end; ++ek.last_req.len; @@ -1472,15 +1491,37 @@ _kdc_as_rep(krb5_context context, goto out; } - log_timestamp(context, config, "AS-REQ", et.authtime, et.starttime, - et.endtime, et.renew_till); + _kdc_log_timestamp(context, config, "AS-REQ", et.authtime, et.starttime, + et.endtime, et.renew_till); + + /* do this as the last thing since this signs the EncTicketPart */ + ret = _kdc_add_KRB5SignedPath(context, + config, + server, + setype, + NULL, + NULL, + &et); + if (ret) + goto out; - ret = encode_reply(context, config, - &rep, &et, &ek, setype, server->entry.kvno, &skey->key, - client->entry.kvno, reply_key, &e_text, reply); + ret = _kdc_encode_reply(context, config, + &rep, &et, &ek, setype, server->entry.kvno, + &skey->key, client->entry.kvno, + reply_key, &e_text, reply); free_EncTicketPart(&et); free_EncKDCRepPart(&ek); - out: + if (ret) + goto out; + + /* */ + if (datagram_reply && reply->length > config->max_datagram_reply_length) { + krb5_data_free(reply); + ret = KRB5KRB_ERR_RESPONSE_TOO_BIG; + e_text = "Reply packet too large"; + } + +out: free_AS_REP(&rep); if(ret){ krb5_mk_error(context, @@ -1494,7 +1535,7 @@ _kdc_as_rep(krb5_context context, reply); ret = 0; } - out2: +out2: #ifdef PKINIT if (pkp) _kdc_pk_free_client_param(context, pkp); @@ -1511,1089 +1552,3 @@ _kdc_as_rep(krb5_context context, _kdc_free_ent(context, server); return ret; } - - -static krb5_error_code -check_tgs_flags(krb5_context context, - krb5_kdc_configuration *config, - KDC_REQ_BODY *b, EncTicketPart *tgt, EncTicketPart *et) -{ - KDCOptions f = b->kdc_options; - - if(f.validate){ - if(!tgt->flags.invalid || tgt->starttime == NULL){ - kdc_log(context, config, 0, - "Bad request to validate ticket"); - return KRB5KDC_ERR_BADOPTION; - } - if(*tgt->starttime > kdc_time){ - kdc_log(context, config, 0, - "Early request to validate ticket"); - return KRB5KRB_AP_ERR_TKT_NYV; - } - /* XXX tkt = tgt */ - et->flags.invalid = 0; - }else if(tgt->flags.invalid){ - kdc_log(context, config, 0, - "Ticket-granting ticket has INVALID flag set"); - return KRB5KRB_AP_ERR_TKT_INVALID; - } - - if(f.forwardable){ - if(!tgt->flags.forwardable){ - kdc_log(context, config, 0, - "Bad request for forwardable ticket"); - return KRB5KDC_ERR_BADOPTION; - } - et->flags.forwardable = 1; - } - if(f.forwarded){ - if(!tgt->flags.forwardable){ - kdc_log(context, config, 0, - "Request to forward non-forwardable ticket"); - return KRB5KDC_ERR_BADOPTION; - } - et->flags.forwarded = 1; - et->caddr = b->addresses; - } - if(tgt->flags.forwarded) - et->flags.forwarded = 1; - - if(f.proxiable){ - if(!tgt->flags.proxiable){ - kdc_log(context, config, 0, - "Bad request for proxiable ticket"); - return KRB5KDC_ERR_BADOPTION; - } - et->flags.proxiable = 1; - } - if(f.proxy){ - if(!tgt->flags.proxiable){ - kdc_log(context, config, 0, - "Request to proxy non-proxiable ticket"); - return KRB5KDC_ERR_BADOPTION; - } - et->flags.proxy = 1; - et->caddr = b->addresses; - } - if(tgt->flags.proxy) - et->flags.proxy = 1; - - if(f.allow_postdate){ - if(!tgt->flags.may_postdate){ - kdc_log(context, config, 0, - "Bad request for post-datable ticket"); - return KRB5KDC_ERR_BADOPTION; - } - et->flags.may_postdate = 1; - } - if(f.postdated){ - if(!tgt->flags.may_postdate){ - kdc_log(context, config, 0, - "Bad request for postdated ticket"); - return KRB5KDC_ERR_BADOPTION; - } - if(b->from) - *et->starttime = *b->from; - et->flags.postdated = 1; - et->flags.invalid = 1; - }else if(b->from && *b->from > kdc_time + context->max_skew){ - kdc_log(context, config, 0, "Ticket cannot be postdated"); - return KRB5KDC_ERR_CANNOT_POSTDATE; - } - - if(f.renewable){ - if(!tgt->flags.renewable){ - kdc_log(context, config, 0, - "Bad request for renewable ticket"); - return KRB5KDC_ERR_BADOPTION; - } - et->flags.renewable = 1; - ALLOC(et->renew_till); - fix_time(&b->rtime); - *et->renew_till = *b->rtime; - } - if(f.renew){ - time_t old_life; - if(!tgt->flags.renewable || tgt->renew_till == NULL){ - kdc_log(context, config, 0, - "Request to renew non-renewable ticket"); - return KRB5KDC_ERR_BADOPTION; - } - old_life = tgt->endtime; - if(tgt->starttime) - old_life -= *tgt->starttime; - else - old_life -= tgt->authtime; - et->endtime = *et->starttime + old_life; - if (et->renew_till != NULL) - et->endtime = min(*et->renew_till, et->endtime); - } - - /* checks for excess flags */ - if(f.request_anonymous && !config->allow_anonymous){ - kdc_log(context, config, 0, - "Request for anonymous ticket"); - return KRB5KDC_ERR_BADOPTION; - } - return 0; -} - -static krb5_error_code -fix_transited_encoding(krb5_context context, - krb5_kdc_configuration *config, - krb5_boolean check_policy, - TransitedEncoding *tr, - EncTicketPart *et, - const char *client_realm, - const char *server_realm, - const char *tgt_realm) -{ - krb5_error_code ret = 0; - char **realms, **tmp; - int num_realms; - int i; - - switch (tr->tr_type) { - case DOMAIN_X500_COMPRESS: - break; - case 0: - /* - * Allow empty content of type 0 because that is was Microsoft - * generates in their TGT. - */ - if (tr->contents.length == 0) - break; - kdc_log(context, config, 0, - "Transited type 0 with non empty content"); - return KRB5KDC_ERR_TRTYPE_NOSUPP; - default: - kdc_log(context, config, 0, - "Unknown transited type: %u", tr->tr_type); - return KRB5KDC_ERR_TRTYPE_NOSUPP; - } - - ret = krb5_domain_x500_decode(context, - tr->contents, - &realms, - &num_realms, - client_realm, - server_realm); - if(ret){ - krb5_warn(context, ret, - "Decoding transited encoding"); - return ret; - } - if(strcmp(client_realm, tgt_realm) && strcmp(server_realm, tgt_realm)) { - /* not us, so add the previous realm to transited set */ - if (num_realms < 0 || num_realms + 1 > UINT_MAX/sizeof(*realms)) { - ret = ERANGE; - goto free_realms; - } - tmp = realloc(realms, (num_realms + 1) * sizeof(*realms)); - if(tmp == NULL){ - ret = ENOMEM; - goto free_realms; - } - realms = tmp; - realms[num_realms] = strdup(tgt_realm); - if(realms[num_realms] == NULL){ - ret = ENOMEM; - goto free_realms; - } - num_realms++; - } - if(num_realms == 0) { - if(strcmp(client_realm, server_realm)) - kdc_log(context, config, 0, - "cross-realm %s -> %s", client_realm, server_realm); - } else { - size_t l = 0; - char *rs; - for(i = 0; i < num_realms; i++) - l += strlen(realms[i]) + 2; - rs = malloc(l); - if(rs != NULL) { - *rs = '\0'; - for(i = 0; i < num_realms; i++) { - if(i > 0) - strlcat(rs, ", ", l); - strlcat(rs, realms[i], l); - } - kdc_log(context, config, 0, - "cross-realm %s -> %s via [%s]", - client_realm, server_realm, rs); - free(rs); - } - } - if(check_policy) { - ret = krb5_check_transited(context, client_realm, - server_realm, - realms, num_realms, NULL); - if(ret) { - krb5_warn(context, ret, "cross-realm %s -> %s", - client_realm, server_realm); - goto free_realms; - } - et->flags.transited_policy_checked = 1; - } - et->transited.tr_type = DOMAIN_X500_COMPRESS; - ret = krb5_domain_x500_encode(realms, num_realms, &et->transited.contents); - if(ret) - krb5_warn(context, ret, "Encoding transited encoding"); - free_realms: - for(i = 0; i < num_realms; i++) - free(realms[i]); - free(realms); - return ret; -} - - -static krb5_error_code -tgs_make_reply(krb5_context context, - krb5_kdc_configuration *config, - KDC_REQ_BODY *b, - EncTicketPart *tgt, - EncTicketPart *adtkt, - AuthorizationData *auth_data, - krb5_ticket *tgs_ticket, - hdb_entry_ex *server, - const char *server_name, - hdb_entry_ex *client, - krb5_principal client_principal, - hdb_entry_ex *krbtgt, - EncryptionKey *tgtkey, - krb5_enctype cetype, - const char **e_text, - krb5_data *reply) -{ - KDC_REP rep; - EncKDCRepPart ek; - EncTicketPart et; - KDCOptions f = b->kdc_options; - krb5_error_code ret; - krb5_enctype etype; - Key *skey; - EncryptionKey *ekey; - AuthorizationData *new_auth_data = NULL; - - if(adtkt) { - int i; - ekey = &adtkt->key; - for(i = 0; i < b->etype.len; i++) - if (b->etype.val[i] == adtkt->key.keytype) - break; - if(i == b->etype.len) { - krb5_clear_error_string(context); - return KRB5KDC_ERR_ETYPE_NOSUPP; - } - etype = b->etype.val[i]; - }else{ - ret = find_keys(context, config, - NULL, NULL, server, server_name, - NULL, NULL, &skey, &etype, - b->etype.val, b->etype.len); - if(ret) - return ret; - ekey = &skey->key; - } - - memset(&rep, 0, sizeof(rep)); - memset(&et, 0, sizeof(et)); - memset(&ek, 0, sizeof(ek)); - - rep.pvno = 5; - rep.msg_type = krb_tgs_rep; - - et.authtime = tgt->authtime; - fix_time(&b->till); - et.endtime = min(tgt->endtime, *b->till); - ALLOC(et.starttime); - *et.starttime = kdc_time; - - ret = check_tgs_flags(context, config, b, tgt, &et); - if(ret) - goto out; - - /* We should check the transited encoding if: - 1) the request doesn't ask not to be checked - 2) globally enforcing a check - 3) principal requires checking - 4) we allow non-check per-principal, but principal isn't marked as allowing this - 5) we don't globally allow this - */ - -#define GLOBAL_FORCE_TRANSITED_CHECK \ - (config->trpolicy == TRPOLICY_ALWAYS_CHECK) -#define GLOBAL_ALLOW_PER_PRINCIPAL \ - (config->trpolicy == TRPOLICY_ALLOW_PER_PRINCIPAL) -#define GLOBAL_ALLOW_DISABLE_TRANSITED_CHECK \ - (config->trpolicy == TRPOLICY_ALWAYS_HONOUR_REQUEST) - -/* these will consult the database in future release */ -#define PRINCIPAL_FORCE_TRANSITED_CHECK(P) 0 -#define PRINCIPAL_ALLOW_DISABLE_TRANSITED_CHECK(P) 0 - - ret = fix_transited_encoding(context, config, - !f.disable_transited_check || - GLOBAL_FORCE_TRANSITED_CHECK || - PRINCIPAL_FORCE_TRANSITED_CHECK(server) || - !((GLOBAL_ALLOW_PER_PRINCIPAL && - PRINCIPAL_ALLOW_DISABLE_TRANSITED_CHECK(server)) || - GLOBAL_ALLOW_DISABLE_TRANSITED_CHECK), - &tgt->transited, &et, - *krb5_princ_realm(context, client_principal), - *krb5_princ_realm(context, server->entry.principal), - *krb5_princ_realm(context, krbtgt->entry.principal)); - if(ret) - goto out; - - copy_Realm(krb5_princ_realm(context, server->entry.principal), - &rep.ticket.realm); - _krb5_principal2principalname(&rep.ticket.sname, server->entry.principal); - copy_Realm(&tgt->crealm, &rep.crealm); - if (f.request_anonymous) - make_anonymous_principalname (&tgt->cname); - else - copy_PrincipalName(&tgt->cname, &rep.cname); - rep.ticket.tkt_vno = 5; - - ek.caddr = et.caddr; - if(et.caddr == NULL) - et.caddr = tgt->caddr; - - { - time_t life; - life = et.endtime - *et.starttime; - if(client && client->entry.max_life) - life = min(life, *client->entry.max_life); - if(server->entry.max_life) - life = min(life, *server->entry.max_life); - et.endtime = *et.starttime + life; - } - if(f.renewable_ok && tgt->flags.renewable && - et.renew_till == NULL && et.endtime < *b->till){ - et.flags.renewable = 1; - ALLOC(et.renew_till); - *et.renew_till = *b->till; - } - if(et.renew_till){ - time_t renew; - renew = *et.renew_till - et.authtime; - if(client && client->entry.max_renew) - renew = min(renew, *client->entry.max_renew); - if(server->entry.max_renew) - renew = min(renew, *server->entry.max_renew); - *et.renew_till = et.authtime + renew; - } - - if(et.renew_till){ - *et.renew_till = min(*et.renew_till, *tgt->renew_till); - *et.starttime = min(*et.starttime, *et.renew_till); - et.endtime = min(et.endtime, *et.renew_till); - } - - *et.starttime = min(*et.starttime, et.endtime); - - if(*et.starttime == et.endtime){ - ret = KRB5KDC_ERR_NEVER_VALID; - goto out; - } - if(et.renew_till && et.endtime == *et.renew_till){ - free(et.renew_till); - et.renew_till = NULL; - et.flags.renewable = 0; - } - - et.flags.pre_authent = tgt->flags.pre_authent; - et.flags.hw_authent = tgt->flags.hw_authent; - et.flags.anonymous = tgt->flags.anonymous; - et.flags.ok_as_delegate = server->entry.flags.ok_as_delegate; - - - krb5_generate_random_keyblock(context, etype, &et.key); - - if (server->authz_data_tgs_req) { - ret = server->authz_data_tgs_req(context, server, - client_principal, - tgs_ticket->ticket.authorization_data, - tgs_ticket->ticket.authtime, - tgtkey, - ekey, - &et.key, - &new_auth_data); - if (ret) { - new_auth_data = NULL; - } - } - - /* XXX Check enc-authorization-data */ - et.authorization_data = new_auth_data; - - et.crealm = tgt->crealm; - et.cname = tgt->cname; - - ek.key = et.key; - /* MIT must have at least one last_req */ - ek.last_req.len = 1; - ek.last_req.val = calloc(1, sizeof(*ek.last_req.val)); - ek.nonce = b->nonce; - ek.flags = et.flags; - ek.authtime = et.authtime; - ek.starttime = et.starttime; - ek.endtime = et.endtime; - ek.renew_till = et.renew_till; - ek.srealm = rep.ticket.realm; - ek.sname = rep.ticket.sname; - - log_timestamp(context, config, "TGS-REQ", et.authtime, et.starttime, - et.endtime, et.renew_till); - - /* It is somewhat unclear where the etype in the following - encryption should come from. What we have is a session - key in the passed tgt, and a list of preferred etypes - *for the new ticket*. Should we pick the best possible - etype, given the keytype in the tgt, or should we look - at the etype list here as well? What if the tgt - session key is DES3 and we want a ticket with a (say) - CAST session key. Should the DES3 etype be added to the - etype list, even if we don't want a session key with - DES3? */ - ret = encode_reply(context, config, - &rep, &et, &ek, etype, adtkt ? 0 : server->entry.kvno, - ekey, 0, &tgt->key, e_text, reply); - out: - free_TGS_REP(&rep); - free_TransitedEncoding(&et.transited); - if(et.starttime) - free(et.starttime); - if(et.renew_till) - free(et.renew_till); - free_LastReq(&ek.last_req); - memset(et.key.keyvalue.data, 0, et.key.keyvalue.length); - free_EncryptionKey(&et.key); - return ret; -} - -static krb5_error_code -tgs_check_authenticator(krb5_context context, - krb5_kdc_configuration *config, - krb5_auth_context ac, - KDC_REQ_BODY *b, - const char **e_text, - krb5_keyblock *key) -{ - krb5_authenticator auth; - size_t len; - unsigned char *buf; - size_t buf_size; - krb5_error_code ret; - krb5_crypto crypto; - - krb5_auth_con_getauthenticator(context, ac, &auth); - if(auth->cksum == NULL){ - kdc_log(context, config, 0, "No authenticator in request"); - ret = KRB5KRB_AP_ERR_INAPP_CKSUM; - goto out; - } - /* - * according to RFC1510 it doesn't need to be keyed, - * but according to the latest draft it needs to. - */ - if ( -#if 0 -!krb5_checksum_is_keyed(context, auth->cksum->cksumtype) - || -#endif - !krb5_checksum_is_collision_proof(context, auth->cksum->cksumtype)) { - kdc_log(context, config, 0, "Bad checksum type in authenticator: %d", - auth->cksum->cksumtype); - ret = KRB5KRB_AP_ERR_INAPP_CKSUM; - goto out; - } - - /* XXX should not re-encode this */ - ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, b, &len, ret); - if(ret){ - kdc_log(context, config, 0, "Failed to encode KDC-REQ-BODY: %s", - krb5_get_err_text(context, ret)); - goto out; - } - if(buf_size != len) { - free(buf); - kdc_log(context, config, 0, "Internal error in ASN.1 encoder"); - *e_text = "KDC internal error"; - ret = KRB5KRB_ERR_GENERIC; - goto out; - } - ret = krb5_crypto_init(context, key, 0, &crypto); - if (ret) { - free(buf); - kdc_log(context, config, 0, "krb5_crypto_init failed: %s", - krb5_get_err_text(context, ret)); - goto out; - } - ret = krb5_verify_checksum(context, - crypto, - KRB5_KU_TGS_REQ_AUTH_CKSUM, - buf, - len, - auth->cksum); - free(buf); - krb5_crypto_destroy(context, crypto); - if(ret){ - kdc_log(context, config, 0, - "Failed to verify authenticator checksum: %s", - krb5_get_err_text(context, ret)); - } -out: - free_Authenticator(auth); - free(auth); - return ret; -} - -/* - * return the realm of a krbtgt-ticket or NULL - */ - -static Realm -get_krbtgt_realm(const PrincipalName *p) -{ - if(p->name_string.len == 2 - && strcmp(p->name_string.val[0], KRB5_TGS_NAME) == 0) - return p->name_string.val[1]; - else - return NULL; -} - -static const char * -find_rpath(krb5_context context, Realm crealm, Realm srealm) -{ - const char *new_realm = krb5_config_get_string(context, - NULL, - "capaths", - crealm, - srealm, - NULL); - return new_realm; -} - - -static krb5_boolean -need_referral(krb5_context context, krb5_principal server, krb5_realm **realms) -{ - if(server->name.name_type != KRB5_NT_SRV_INST || - server->name.name_string.len != 2) - return FALSE; - - return _krb5_get_host_realm_int(context, server->name.name_string.val[1], - FALSE, realms) == 0; -} - -static krb5_error_code -tgs_rep2(krb5_context context, - krb5_kdc_configuration *config, - KDC_REQ_BODY *b, - PA_DATA *tgs_req, - krb5_data *reply, - const char *from, - const struct sockaddr *from_addr, - time_t **csec, - int **cusec) -{ - krb5_ap_req ap_req; - krb5_error_code ret; - krb5_principal princ; - krb5_auth_context ac = NULL; - krb5_ticket *ticket = NULL; - krb5_flags ap_req_options; - krb5_flags verify_ap_req_flags; - const char *e_text = NULL; - krb5_crypto crypto; - - hdb_entry_ex *krbtgt = NULL; - EncTicketPart *tgt; - Key *tkey; - krb5_enctype cetype; - krb5_principal cp = NULL; - krb5_principal sp = NULL; - AuthorizationData *auth_data = NULL; - - *csec = NULL; - *cusec = NULL; - - memset(&ap_req, 0, sizeof(ap_req)); - ret = krb5_decode_ap_req(context, &tgs_req->padata_value, &ap_req); - if(ret){ - kdc_log(context, config, 0, "Failed to decode AP-REQ: %s", - krb5_get_err_text(context, ret)); - goto out2; - } - - if(!get_krbtgt_realm(&ap_req.ticket.sname)){ - /* XXX check for ticket.sname == req.sname */ - kdc_log(context, config, 0, "PA-DATA is not a ticket-granting ticket"); - ret = KRB5KDC_ERR_POLICY; /* ? */ - goto out2; - } - - _krb5_principalname2krb5_principal(context, &princ, - ap_req.ticket.sname, - ap_req.ticket.realm); - - ret = _kdc_db_fetch(context, config, princ, HDB_F_GET_KRBTGT, &krbtgt); - - if(ret) { - char *p; - ret = krb5_unparse_name(context, princ, &p); - if (ret != 0) - p = "<unparse_name failed>"; - krb5_free_principal(context, princ); - kdc_log(context, config, 0, - "Ticket-granting ticket not found in database: %s: %s", - p, krb5_get_err_text(context, ret)); - if (ret == 0) - free(p); - ret = KRB5KRB_AP_ERR_NOT_US; - goto out2; - } - - if(ap_req.ticket.enc_part.kvno && - *ap_req.ticket.enc_part.kvno != krbtgt->entry.kvno){ - char *p; - - ret = krb5_unparse_name (context, princ, &p); - krb5_free_principal(context, princ); - if (ret != 0) - p = "<unparse_name failed>"; - kdc_log(context, config, 0, - "Ticket kvno = %d, DB kvno = %d (%s)", - *ap_req.ticket.enc_part.kvno, - krbtgt->entry.kvno, - p); - if (ret == 0) - free (p); - ret = KRB5KRB_AP_ERR_BADKEYVER; - goto out2; - } - - ret = hdb_enctype2key(context, &krbtgt->entry, - ap_req.ticket.enc_part.etype, &tkey); - if(ret){ - char *str, *p; - krb5_enctype_to_string(context, ap_req.ticket.enc_part.etype, &str); - krb5_unparse_name(context, princ, &p); - kdc_log(context, config, 0, - "No server key with enctype %s found for %s", str, p); - free(str); - free(p); - ret = KRB5KRB_AP_ERR_BADKEYVER; - goto out2; - } - - if (b->kdc_options.validate) - verify_ap_req_flags = KRB5_VERIFY_AP_REQ_IGNORE_INVALID; - else - verify_ap_req_flags = 0; - - ret = krb5_verify_ap_req2(context, - &ac, - &ap_req, - princ, - &tkey->key, - verify_ap_req_flags, - &ap_req_options, - &ticket, - KRB5_KU_TGS_REQ_AUTH); - - krb5_free_principal(context, princ); - if(ret) { - kdc_log(context, config, 0, "Failed to verify AP-REQ: %s", - krb5_get_err_text(context, ret)); - goto out2; - } - - { - krb5_authenticator auth; - - ret = krb5_auth_con_getauthenticator(context, ac, &auth); - if (ret == 0) { - *csec = malloc(sizeof(**csec)); - if (*csec == NULL) { - krb5_free_authenticator(context, &auth); - kdc_log(context, config, 0, "malloc failed"); - goto out2; - } - **csec = auth->ctime; - *cusec = malloc(sizeof(**cusec)); - if (*cusec == NULL) { - krb5_free_authenticator(context, &auth); - kdc_log(context, config, 0, "malloc failed"); - goto out2; - } - **csec = auth->cusec; - krb5_free_authenticator(context, &auth); - } - } - - cetype = ap_req.authenticator.etype; - - tgt = &ticket->ticket; - - ret = tgs_check_authenticator(context, config, - ac, b, &e_text, &tgt->key); - if (ret) { - krb5_auth_con_free(context, ac); - goto out2; - } - - if (b->enc_authorization_data) { - krb5_keyblock *subkey; - krb5_data ad; - ret = krb5_auth_con_getremotesubkey(context, - ac, - &subkey); - if(ret){ - krb5_auth_con_free(context, ac); - kdc_log(context, config, 0, "Failed to get remote subkey: %s", - krb5_get_err_text(context, ret)); - goto out2; - } - if(subkey == NULL){ - ret = krb5_auth_con_getkey(context, ac, &subkey); - if(ret) { - krb5_auth_con_free(context, ac); - kdc_log(context, config, 0, "Failed to get session key: %s", - krb5_get_err_text(context, ret)); - goto out2; - } - } - if(subkey == NULL){ - krb5_auth_con_free(context, ac); - kdc_log(context, config, 0, - "Failed to get key for enc-authorization-data"); - ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; /* ? */ - goto out2; - } - ret = krb5_crypto_init(context, subkey, 0, &crypto); - if (ret) { - krb5_auth_con_free(context, ac); - kdc_log(context, config, 0, "krb5_crypto_init failed: %s", - krb5_get_err_text(context, ret)); - goto out2; - } - ret = krb5_decrypt_EncryptedData (context, - crypto, - KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY, - b->enc_authorization_data, - &ad); - krb5_crypto_destroy(context, crypto); - if(ret){ - krb5_auth_con_free(context, ac); - kdc_log(context, config, 0, "Failed to decrypt enc-authorization-data"); - ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; /* ? */ - goto out2; - } - krb5_free_keyblock(context, subkey); - ALLOC(auth_data); - ret = decode_AuthorizationData(ad.data, ad.length, auth_data, NULL); - if(ret){ - krb5_auth_con_free(context, ac); - free(auth_data); - auth_data = NULL; - kdc_log(context, config, 0, "Failed to decode authorization data"); - ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; /* ? */ - goto out2; - } - } - - krb5_auth_con_free(context, ac); - - { - PrincipalName *s; - Realm r; - char *spn = NULL, *cpn = NULL; - hdb_entry_ex *server = NULL, *client = NULL; - int nloop = 0; - EncTicketPart adtkt; - char opt_str[128]; - - s = b->sname; - r = b->realm; - if(b->kdc_options.enc_tkt_in_skey){ - Ticket *t; - hdb_entry_ex *uu; - krb5_principal p; - Key *uukey; - - if(b->additional_tickets == NULL || - b->additional_tickets->len == 0){ - ret = KRB5KDC_ERR_BADOPTION; /* ? */ - kdc_log(context, config, 0, - "No second ticket present in request"); - goto out; - } - t = &b->additional_tickets->val[0]; - if(!get_krbtgt_realm(&t->sname)){ - kdc_log(context, config, 0, - "Additional ticket is not a ticket-granting ticket"); - ret = KRB5KDC_ERR_POLICY; - goto out2; - } - _krb5_principalname2krb5_principal(context, &p, t->sname, t->realm); - ret = _kdc_db_fetch(context, config, p, - HDB_F_GET_CLIENT|HDB_F_GET_SERVER, &uu); - krb5_free_principal(context, p); - if(ret){ - if (ret == HDB_ERR_NOENTRY) - ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN; - goto out; - } - ret = hdb_enctype2key(context, &uu->entry, - t->enc_part.etype, &uukey); - if(ret){ - _kdc_free_ent(context, uu); - ret = KRB5KDC_ERR_ETYPE_NOSUPP; /* XXX */ - goto out; - } - ret = krb5_decrypt_ticket(context, t, &uukey->key, &adtkt, 0); - _kdc_free_ent(context, uu); - if(ret) - goto out; - s = &adtkt.cname; - r = adtkt.crealm; - } - - _krb5_principalname2krb5_principal(context, &sp, *s, r); - ret = krb5_unparse_name(context, sp, &spn); - if (ret) - goto out; - _krb5_principalname2krb5_principal(context, &cp, tgt->cname, tgt->crealm); - ret = krb5_unparse_name(context, cp, &cpn); - if (ret) - goto out; - unparse_flags (KDCOptions2int(b->kdc_options), - asn1_KDCOptions_units(), - opt_str, sizeof(opt_str)); - if(*opt_str) - kdc_log(context, config, 0, - "TGS-REQ %s from %s for %s [%s]", - cpn, from, spn, opt_str); - else - kdc_log(context, config, 0, - "TGS-REQ %s from %s for %s", cpn, from, spn); - server_lookup: - ret = _kdc_db_fetch(context, config, sp, HDB_F_GET_SERVER, &server); - - if(ret){ - const char *new_rlm; - Realm req_rlm; - krb5_realm *realms; - - if ((req_rlm = get_krbtgt_realm(&sp->name)) != NULL) { - if(nloop++ < 2) { - new_rlm = find_rpath(context, tgt->crealm, req_rlm); - if(new_rlm) { - kdc_log(context, config, 5, "krbtgt for realm %s not found, trying %s", - req_rlm, new_rlm); - krb5_free_principal(context, sp); - free(spn); - krb5_make_principal(context, &sp, r, - KRB5_TGS_NAME, new_rlm, NULL); - ret = krb5_unparse_name(context, sp, &spn); - if (ret) - goto out; - goto server_lookup; - } - } - } else if(need_referral(context, sp, &realms)) { - if (strcmp(realms[0], sp->realm) != 0) { - kdc_log(context, config, 5, - "Returning a referral to realm %s for " - "server %s that was not found", - realms[0], spn); - krb5_free_principal(context, sp); - free(spn); - krb5_make_principal(context, &sp, r, KRB5_TGS_NAME, - realms[0], NULL); - ret = krb5_unparse_name(context, sp, &spn); - if (ret) - goto out; - krb5_free_host_realm(context, realms); - goto server_lookup; - } - krb5_free_host_realm(context, realms); - } - kdc_log(context, config, 0, - "Server not found in database: %s: %s", spn, - krb5_get_err_text(context, ret)); - if (ret == HDB_ERR_NOENTRY) - ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN; - goto out; - } - - ret = _kdc_db_fetch(context, config, cp, HDB_F_GET_CLIENT, &client); - if(ret) - kdc_log(context, config, 1, "Client not found in database: %s: %s", - cpn, krb5_get_err_text(context, ret)); - - /* - * If the client belongs to the same realm as our krbtgt, it - * should exist in the local database. - * - * If its not the same, check the "direction" on the krbtgt, - * so its not a backward uni-directional trust. - */ - - if(strcmp(krb5_principal_get_realm(context, sp), - krb5_principal_get_comp_string(context, - krbtgt->entry.principal, 1)) == 0) { - if(ret) { - if (ret == HDB_ERR_NOENTRY) - ret = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN; - goto out; - } - } else { - char *tpn; - ret = krb5_unparse_name(context, krbtgt->entry.principal, &tpn); - kdc_log(context, config, 0, - "Request with wrong krbtgt: %s", - (ret == 0) ? tpn : "<unknown>"); - if(ret == 0) - free(tpn); - ret = KRB5KRB_AP_ERR_NOT_US; - goto out; - - } - - ret = _kdc_check_flags(context, config, - client, cpn, - server, spn, - FALSE); - if(ret) - goto out; - - if((b->kdc_options.validate || b->kdc_options.renew) && - !krb5_principal_compare(context, - krbtgt->entry.principal, - server->entry.principal)){ - kdc_log(context, config, 0, "Inconsistent request."); - ret = KRB5KDC_ERR_SERVER_NOMATCH; - goto out; - } - - /* check for valid set of addresses */ - if(!check_addresses(context, config, tgt->caddr, from_addr)) { - ret = KRB5KRB_AP_ERR_BADADDR; - kdc_log(context, config, 0, "Request from wrong address"); - goto out; - } - - ret = tgs_make_reply(context, - config, - b, - tgt, - b->kdc_options.enc_tkt_in_skey ? &adtkt : NULL, - auth_data, - ticket, - server, - spn, - client, - cp, - krbtgt, - &tkey->key, - cetype, - &e_text, - reply); - - out: - free(spn); - free(cpn); - - if(server) - _kdc_free_ent(context, server); - if(client) - _kdc_free_ent(context, client); - } - out2: - if(ret) { - krb5_mk_error(context, - ret, - e_text, - NULL, - cp, - sp, - NULL, - NULL, - reply); - free(*csec); - free(*cusec); - *csec = NULL; - *cusec = NULL; - } - krb5_free_principal(context, cp); - krb5_free_principal(context, sp); - if (ticket) - krb5_free_ticket(context, ticket); - free_AP_REQ(&ap_req); - if(auth_data){ - free_AuthorizationData(auth_data); - free(auth_data); - } - - if(krbtgt) - _kdc_free_ent(context, krbtgt); - - return ret; -} - - -krb5_error_code -_kdc_tgs_rep(krb5_context context, - krb5_kdc_configuration *config, - KDC_REQ *req, - krb5_data *data, - const char *from, - struct sockaddr *from_addr) -{ - krb5_error_code ret; - int i = 0; - PA_DATA *tgs_req = NULL; - time_t *csec = NULL; - int *cusec = NULL; - - if(req->padata == NULL){ - ret = KRB5KDC_ERR_PREAUTH_REQUIRED; /* XXX ??? */ - kdc_log(context, config, 0, - "TGS-REQ from %s without PA-DATA", from); - goto out; - } - - tgs_req = find_padata(req, &i, KRB5_PADATA_TGS_REQ); - - if(tgs_req == NULL){ - ret = KRB5KDC_ERR_PADATA_TYPE_NOSUPP; - - kdc_log(context, config, 0, - "TGS-REQ from %s without PA-TGS-REQ", from); - goto out; - } - ret = tgs_rep2(context, config, - &req->req_body, tgs_req, data, from, from_addr, - &csec, &cusec); -out: - if(ret && data->data == NULL){ - krb5_mk_error(context, - ret, - NULL, - NULL, - NULL, - NULL, - csec, - cusec, - data); - } - free(csec); - free(cusec); - return 0; -} |