diff options
Diffstat (limited to 'source4/heimdal/lib/krb5/get_cred.c')
| -rw-r--r-- | source4/heimdal/lib/krb5/get_cred.c | 1423 |
1 files changed, 1423 insertions, 0 deletions
diff --git a/source4/heimdal/lib/krb5/get_cred.c b/source4/heimdal/lib/krb5/get_cred.c new file mode 100644 index 0000000000..c19a5e4abc --- /dev/null +++ b/source4/heimdal/lib/krb5/get_cred.c @@ -0,0 +1,1423 @@ +/* + * Copyright (c) 1997 - 2008 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> + +RCSID("$Id$"); + +/* + * Take the `body' and encode it into `padata' using the credentials + * in `creds'. + */ + +static krb5_error_code +make_pa_tgs_req(krb5_context context, + krb5_auth_context ac, + KDC_REQ_BODY *body, + PA_DATA *padata, + krb5_creds *creds) +{ + u_char *buf; + size_t buf_size; + size_t len; + krb5_data in_data; + krb5_error_code ret; + + ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, body, &len, ret); + if (ret) + goto out; + if(buf_size != len) + krb5_abortx(context, "internal error in ASN.1 encoder"); + + in_data.length = len; + in_data.data = buf; + ret = _krb5_mk_req_internal(context, &ac, 0, &in_data, creds, + &padata->padata_value, + KRB5_KU_TGS_REQ_AUTH_CKSUM, + KRB5_KU_TGS_REQ_AUTH); + out: + free (buf); + if(ret) + return ret; + padata->padata_type = KRB5_PADATA_TGS_REQ; + return 0; +} + +/* + * Set the `enc-authorization-data' in `req_body' based on `authdata' + */ + +static krb5_error_code +set_auth_data (krb5_context context, + KDC_REQ_BODY *req_body, + krb5_authdata *authdata, + krb5_keyblock *key) +{ + if(authdata->len) { + size_t len, buf_size; + unsigned char *buf; + krb5_crypto crypto; + krb5_error_code ret; + + ASN1_MALLOC_ENCODE(AuthorizationData, buf, buf_size, authdata, + &len, ret); + if (ret) + return ret; + if (buf_size != len) + krb5_abortx(context, "internal error in ASN.1 encoder"); + + ALLOC(req_body->enc_authorization_data, 1); + if (req_body->enc_authorization_data == NULL) { + free (buf); + krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); + return ENOMEM; + } + ret = krb5_crypto_init(context, key, 0, &crypto); + if (ret) { + free (buf); + free (req_body->enc_authorization_data); + req_body->enc_authorization_data = NULL; + return ret; + } + krb5_encrypt_EncryptedData(context, + crypto, + KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY, + /* KRB5_KU_TGS_REQ_AUTH_DAT_SESSION? */ + buf, + len, + 0, + req_body->enc_authorization_data); + free (buf); + krb5_crypto_destroy(context, crypto); + } else { + req_body->enc_authorization_data = NULL; + } + return 0; +} + +/* + * Create a tgs-req in `t' with `addresses', `flags', `second_ticket' + * (if not-NULL), `in_creds', `krbtgt', and returning the generated + * subkey in `subkey'. + */ + +static krb5_error_code +init_tgs_req (krb5_context context, + krb5_ccache ccache, + krb5_addresses *addresses, + krb5_kdc_flags flags, + Ticket *second_ticket, + krb5_creds *in_creds, + krb5_creds *krbtgt, + unsigned nonce, + const METHOD_DATA *padata, + krb5_keyblock **subkey, + TGS_REQ *t) +{ + krb5_error_code ret = 0; + + memset(t, 0, sizeof(*t)); + t->pvno = 5; + t->msg_type = krb_tgs_req; + if (in_creds->session.keytype) { + ALLOC_SEQ(&t->req_body.etype, 1); + if(t->req_body.etype.val == NULL) { + ret = ENOMEM; + krb5_set_error_message(context, ret, "malloc: out of memory"); + goto fail; + } + t->req_body.etype.val[0] = in_creds->session.keytype; + } else { + ret = krb5_init_etype(context, + &t->req_body.etype.len, + &t->req_body.etype.val, + NULL); + } + if (ret) + goto fail; + t->req_body.addresses = addresses; + t->req_body.kdc_options = flags.b; + ret = copy_Realm(&in_creds->server->realm, &t->req_body.realm); + if (ret) + goto fail; + ALLOC(t->req_body.sname, 1); + if (t->req_body.sname == NULL) { + ret = ENOMEM; + krb5_set_error_message(context, ret, "malloc: out of memory"); + goto fail; + } + + /* some versions of some code might require that the client be + present in TGS-REQs, but this is clearly against the spec */ + + ret = copy_PrincipalName(&in_creds->server->name, t->req_body.sname); + if (ret) + goto fail; + + /* req_body.till should be NULL if there is no endtime specified, + but old MIT code (like DCE secd) doesn't like that */ + ALLOC(t->req_body.till, 1); + if(t->req_body.till == NULL){ + ret = ENOMEM; + krb5_set_error_message(context, ret, "malloc: out of memory"); + goto fail; + } + *t->req_body.till = in_creds->times.endtime; + + t->req_body.nonce = nonce; + if(second_ticket){ + ALLOC(t->req_body.additional_tickets, 1); + if (t->req_body.additional_tickets == NULL) { + ret = ENOMEM; + krb5_set_error_message(context, ret, "malloc: out of memory"); + goto fail; + } + ALLOC_SEQ(t->req_body.additional_tickets, 1); + if (t->req_body.additional_tickets->val == NULL) { + ret = ENOMEM; + krb5_set_error_message(context, ret, "malloc: out of memory"); + goto fail; + } + ret = copy_Ticket(second_ticket, t->req_body.additional_tickets->val); + if (ret) + goto fail; + } + ALLOC(t->padata, 1); + if (t->padata == NULL) { + ret = ENOMEM; + krb5_set_error_message(context, ret, "malloc: out of memory"); + goto fail; + } + ALLOC_SEQ(t->padata, 1 + padata->len); + if (t->padata->val == NULL) { + ret = ENOMEM; + krb5_set_error_message(context, ret, "malloc: out of memory"); + goto fail; + } + { + int i; + for (i = 0; i < padata->len; i++) { + ret = copy_PA_DATA(&padata->val[i], &t->padata->val[i + 1]); + if (ret) { + krb5_set_error_message(context, ret, "malloc: out of memory"); + goto fail; + } + } + } + + { + krb5_auth_context ac; + krb5_keyblock *key = NULL; + + ret = krb5_auth_con_init(context, &ac); + if(ret) + goto fail; + + if (krb5_config_get_bool_default(context, NULL, FALSE, + "realms", + krbtgt->server->realm, + "tgs_require_subkey", + NULL)) + { + ret = krb5_generate_subkey (context, &krbtgt->session, &key); + if (ret) { + krb5_auth_con_free (context, ac); + goto fail; + } + + ret = krb5_auth_con_setlocalsubkey(context, ac, key); + if (ret) { + if (key) + krb5_free_keyblock (context, key); + krb5_auth_con_free (context, ac); + goto fail; + } + } + + ret = set_auth_data (context, &t->req_body, &in_creds->authdata, + key ? key : &krbtgt->session); + if (ret) { + if (key) + krb5_free_keyblock (context, key); + krb5_auth_con_free (context, ac); + goto fail; + } + + ret = make_pa_tgs_req(context, + ac, + &t->req_body, + &t->padata->val[0], + krbtgt); + if(ret) { + if (key) + krb5_free_keyblock (context, key); + krb5_auth_con_free(context, ac); + goto fail; + } + *subkey = key; + + krb5_auth_con_free(context, ac); + } +fail: + if (ret) { + t->req_body.addresses = NULL; + free_TGS_REQ (t); + } + return ret; +} + +krb5_error_code +_krb5_get_krbtgt(krb5_context context, + krb5_ccache id, + krb5_realm realm, + krb5_creds **cred) +{ + krb5_error_code ret; + krb5_creds tmp_cred; + + memset(&tmp_cred, 0, sizeof(tmp_cred)); + + ret = krb5_cc_get_principal(context, id, &tmp_cred.client); + if (ret) + return ret; + + ret = krb5_make_principal(context, + &tmp_cred.server, + realm, + KRB5_TGS_NAME, + realm, + NULL); + if(ret) { + krb5_free_principal(context, tmp_cred.client); + return ret; + } + ret = krb5_get_credentials(context, + KRB5_GC_CACHED, + id, + &tmp_cred, + cred); + krb5_free_principal(context, tmp_cred.client); + krb5_free_principal(context, tmp_cred.server); + if(ret) + return ret; + return 0; +} + +/* DCE compatible decrypt proc */ +static krb5_error_code +decrypt_tkt_with_subkey (krb5_context context, + krb5_keyblock *key, + krb5_key_usage usage, + krb5_const_pointer subkey, + krb5_kdc_rep *dec_rep) +{ + krb5_error_code ret; + krb5_data data; + size_t size; + krb5_crypto crypto; + + ret = krb5_crypto_init(context, key, 0, &crypto); + if (ret) + return ret; + ret = krb5_decrypt_EncryptedData (context, + crypto, + usage, + &dec_rep->kdc_rep.enc_part, + &data); + krb5_crypto_destroy(context, crypto); + if(ret && subkey){ + /* DCE compat -- try to decrypt with subkey */ + ret = krb5_crypto_init(context, subkey, 0, &crypto); + if (ret) + return ret; + ret = krb5_decrypt_EncryptedData (context, + crypto, + KRB5_KU_TGS_REP_ENC_PART_SUB_KEY, + &dec_rep->kdc_rep.enc_part, + &data); + krb5_crypto_destroy(context, crypto); + } + if (ret) + return ret; + + ret = krb5_decode_EncASRepPart(context, + data.data, + data.length, + &dec_rep->enc_part, + &size); + if (ret) + ret = krb5_decode_EncTGSRepPart(context, + data.data, + data.length, + &dec_rep->enc_part, + &size); + krb5_data_free (&data); + return ret; +} + +static krb5_error_code +get_cred_kdc(krb5_context context, + krb5_ccache id, + krb5_kdc_flags flags, + krb5_addresses *addresses, + krb5_creds *in_creds, + krb5_creds *krbtgt, + krb5_principal impersonate_principal, + Ticket *second_ticket, + krb5_creds *out_creds) +{ + TGS_REQ req; + krb5_data enc; + krb5_data resp; + krb5_kdc_rep rep; + KRB_ERROR error; + krb5_error_code ret; + unsigned nonce; + krb5_keyblock *subkey = NULL; + size_t len; + Ticket second_ticket_data; + METHOD_DATA padata; + + krb5_data_zero(&resp); + krb5_data_zero(&enc); + padata.val = NULL; + padata.len = 0; + + krb5_generate_random_block(&nonce, sizeof(nonce)); + nonce &= 0xffffffff; + + if(flags.b.enc_tkt_in_skey && second_ticket == NULL){ + ret = decode_Ticket(in_creds->second_ticket.data, + in_creds->second_ticket.length, + &second_ticket_data, &len); + if(ret) + return ret; + second_ticket = &second_ticket_data; + } + + + if (impersonate_principal) { + krb5_crypto crypto; + PA_S4U2Self self; + krb5_data data; + void *buf; + size_t size; + + self.name = impersonate_principal->name; + self.realm = impersonate_principal->realm; + self.auth = estrdup("Kerberos"); + + ret = _krb5_s4u2self_to_checksumdata(context, &self, &data); + if (ret) { + free(self.auth); + goto out; + } + + ret = krb5_crypto_init(context, &krbtgt->session, 0, &crypto); + if (ret) { + free(self.auth); + krb5_data_free(&data); + goto out; + } + + ret = krb5_create_checksum(context, + crypto, + KRB5_KU_OTHER_CKSUM, + 0, + data.data, + data.length, + &self.cksum); + krb5_crypto_destroy(context, crypto); + krb5_data_free(&data); + if (ret) { + free(self.auth); + goto out; + } + + ASN1_MALLOC_ENCODE(PA_S4U2Self, buf, len, &self, &size, ret); + free(self.auth); + free_Checksum(&self.cksum); + if (ret) + goto out; + if (len != size) + krb5_abortx(context, "internal asn1 error"); + + ret = krb5_padata_add(context, &padata, KRB5_PADATA_S4U2SELF, buf, len); + if (ret) + goto out; + } + + ret = init_tgs_req (context, + id, + addresses, + flags, + second_ticket, + in_creds, + krbtgt, + nonce, + &padata, + &subkey, + &req); + if (ret) + goto out; + + ASN1_MALLOC_ENCODE(TGS_REQ, enc.data, enc.length, &req, &len, ret); + if (ret) + goto out; + if(enc.length != len) + krb5_abortx(context, "internal error in ASN.1 encoder"); + + /* don't free addresses */ + req.req_body.addresses = NULL; + free_TGS_REQ(&req); + + /* + * Send and receive + */ + { + krb5_sendto_ctx stctx; + ret = krb5_sendto_ctx_alloc(context, &stctx); + if (ret) + return ret; + krb5_sendto_ctx_set_func(stctx, _krb5_kdc_retry, NULL); + + ret = krb5_sendto_context (context, stctx, &enc, + krbtgt->server->name.name_string.val[1], + &resp); + krb5_sendto_ctx_free(context, stctx); + } + if(ret) + goto out; + + memset(&rep, 0, sizeof(rep)); + if(decode_TGS_REP(resp.data, resp.length, &rep.kdc_rep, &len) == 0) { + unsigned eflags = 0; + + ret = krb5_copy_principal(context, + in_creds->client, + &out_creds->client); + if(ret) + goto out2; + ret = krb5_copy_principal(context, + in_creds->server, + &out_creds->server); + if(ret) + goto out2; + /* this should go someplace else */ + out_creds->times.endtime = in_creds->times.endtime; + + /* XXX should do better testing */ + if (flags.b.constrained_delegation || impersonate_principal) + eflags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH; + + ret = _krb5_extract_ticket(context, + &rep, + out_creds, + &krbtgt->session, + NULL, + KRB5_KU_TGS_REP_ENC_PART_SESSION, + &krbtgt->addresses, + nonce, + eflags, + decrypt_tkt_with_subkey, + subkey); + out2: + krb5_free_kdc_rep(context, &rep); + } else if(krb5_rd_error(context, &resp, &error) == 0) { + ret = krb5_error_from_rd_error(context, &error, in_creds); + krb5_free_error_contents(context, &error); + } else if(resp.data && ((char*)resp.data)[0] == 4) { + ret = KRB5KRB_AP_ERR_V4_REPLY; + krb5_clear_error_string(context); + } else { + ret = KRB5KRB_AP_ERR_MSG_TYPE; + krb5_clear_error_string(context); + } + +out: + if (second_ticket == &second_ticket_data) + free_Ticket(&second_ticket_data); + free_METHOD_DATA(&padata); + krb5_data_free(&resp); + krb5_data_free(&enc); + if(subkey){ + krb5_free_keyblock_contents(context, subkey); + free(subkey); + } + return ret; + +} + +/* + * same as above, just get local addresses first if the krbtgt have + * them and the realm is not addressless + */ + +static krb5_error_code +get_cred_kdc_address(krb5_context context, + krb5_ccache id, + krb5_kdc_flags flags, + krb5_addresses *addrs, + krb5_creds *in_creds, + krb5_creds *krbtgt, + krb5_principal impersonate_principal, + Ticket *second_ticket, + krb5_creds *out_creds) +{ + krb5_error_code ret; + krb5_addresses addresses = { 0, NULL }; + + /* + * Inherit the address-ness of the krbtgt if the address is not + * specified. + */ + + if (addrs == NULL && krbtgt->addresses.len != 0) { + krb5_boolean noaddr; + + krb5_appdefault_boolean(context, NULL, krbtgt->server->realm, + "no-addresses", FALSE, &noaddr); + + if (!noaddr) { + krb5_get_all_client_addrs(context, &addresses); + /* XXX this sucks. */ + addrs = &addresses; + if(addresses.len == 0) + addrs = NULL; + } + } + ret = get_cred_kdc(context, id, flags, addrs, in_creds, + krbtgt, impersonate_principal, + second_ticket, out_creds); + krb5_free_addresses(context, &addresses); + return ret; +} + +krb5_error_code KRB5_LIB_FUNCTION +krb5_get_kdc_cred(krb5_context context, + krb5_ccache id, + krb5_kdc_flags flags, + krb5_addresses *addresses, + Ticket *second_ticket, + krb5_creds *in_creds, + krb5_creds **out_creds + ) +{ + krb5_error_code ret; + krb5_creds *krbtgt; + + *out_creds = calloc(1, sizeof(**out_creds)); + if(*out_creds == NULL) { + krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); + return ENOMEM; + } + ret = _krb5_get_krbtgt (context, + id, + in_creds->server->realm, + &krbtgt); + if(ret) { + free(*out_creds); + return ret; + } + ret = get_cred_kdc(context, id, flags, addresses, + in_creds, krbtgt, NULL, NULL, *out_creds); + krb5_free_creds (context, krbtgt); + if(ret) + free(*out_creds); + return ret; +} + +static int +not_found(krb5_context context, krb5_const_principal p, krb5_error_code code) +{ + krb5_error_code ret; + char *str; + + ret = krb5_unparse_name(context, p, &str); + if(ret) { + krb5_clear_error_string(context); + return code; + } + krb5_set_error_message(context, code, "Matching credential (%s) not found", str); + free(str); + return code; +} + +static krb5_error_code +find_cred(krb5_context context, + krb5_ccache id, + krb5_principal server, + krb5_creds **tgts, + krb5_creds *out_creds) +{ + krb5_error_code ret; + krb5_creds mcreds; + + krb5_cc_clear_mcred(&mcreds); + mcreds.server = server; + ret = krb5_cc_retrieve_cred(context, id, KRB5_TC_DONT_MATCH_REALM, + &mcreds, out_creds); + if(ret == 0) + return 0; + while(tgts && *tgts){ + if(krb5_compare_creds(context, KRB5_TC_DONT_MATCH_REALM, + &mcreds, *tgts)){ + ret = krb5_copy_creds_contents(context, *tgts, out_creds); + return ret; + } + tgts++; + } + return not_found(context, server, KRB5_CC_NOTFOUND); +} + +static krb5_error_code +add_cred(krb5_context context, krb5_creds const *tkt, krb5_creds ***tgts) +{ + int i; + krb5_error_code ret; + krb5_creds **tmp = *tgts; + + for(i = 0; tmp && tmp[i]; i++); /* XXX */ + tmp = realloc(tmp, (i+2)*sizeof(*tmp)); + if(tmp == NULL) { + krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); + return ENOMEM; + } + *tgts = tmp; + ret = krb5_copy_creds(context, tkt, &tmp[i]); + tmp[i+1] = NULL; + return ret; +} + +/* +get_cred(server) + creds = cc_get_cred(server) + if(creds) return creds + tgt = cc_get_cred(krbtgt/server_realm@any_realm) + if(tgt) + return get_cred_tgt(server, tgt) + if(client_realm == server_realm) + return NULL + tgt = get_cred(krbtgt/server_realm@client_realm) + while(tgt_inst != server_realm) + tgt = get_cred(krbtgt/server_realm@tgt_inst) + return get_cred_tgt(server, tgt) + */ + +static krb5_error_code +get_cred_kdc_capath(krb5_context context, + krb5_kdc_flags flags, + krb5_ccache ccache, + krb5_creds *in_creds, + krb5_principal impersonate_principal, + Ticket *second_ticket, + krb5_creds **out_creds, + krb5_creds ***ret_tgts) +{ + krb5_error_code ret; + krb5_creds *tgt, tmp_creds; + krb5_const_realm client_realm, server_realm, try_realm; + + *out_creds = NULL; + + client_realm = krb5_principal_get_realm(context, in_creds->client); + server_realm = krb5_principal_get_realm(context, in_creds->server); + memset(&tmp_creds, 0, sizeof(tmp_creds)); + ret = krb5_copy_principal(context, in_creds->client, &tmp_creds.client); + if(ret) + return ret; + + try_realm = krb5_config_get_string(context, NULL, "capaths", + client_realm, server_realm, NULL); + if (try_realm == NULL) + try_realm = client_realm; + + ret = krb5_make_principal(context, + &tmp_creds.server, + try_realm, + KRB5_TGS_NAME, + server_realm, + NULL); + if(ret){ + krb5_free_principal(context, tmp_creds.client); + return ret; + } + { + krb5_creds tgts; + + ret = find_cred(context, ccache, tmp_creds.server, + *ret_tgts, &tgts); + if(ret == 0){ + *out_creds = calloc(1, sizeof(**out_creds)); + if(*out_creds == NULL) { + ret = ENOMEM; + krb5_set_error_message(context, ret, "malloc: out of memory"); + } else { + ret = get_cred_kdc_address(context, ccache, flags, NULL, + in_creds, &tgts, + impersonate_principal, + second_ticket, + *out_creds); + if (ret) { + free (*out_creds); + *out_creds = NULL; + } + } + krb5_free_cred_contents(context, &tgts); + krb5_free_principal(context, tmp_creds.server); + krb5_free_principal(context, tmp_creds.client); + return ret; + } + } + if(krb5_realm_compare(context, in_creds->client, in_creds->server)) + return not_found(context, in_creds->server, KRB5_CC_NOTFOUND); + + /* XXX this can loop forever */ + while(1){ + heim_general_string tgt_inst; + + ret = get_cred_kdc_capath(context, flags, ccache, &tmp_creds, + NULL, NULL, &tgt, ret_tgts); + if(ret) { + krb5_free_principal(context, tmp_creds.server); + krb5_free_principal(context, tmp_creds.client); + return ret; + } + ret = add_cred(context, tgt, ret_tgts); + if(ret) { + krb5_free_principal(context, tmp_creds.server); + krb5_free_principal(context, tmp_creds.client); + return ret; + } + tgt_inst = tgt->server->name.name_string.val[1]; + if(strcmp(tgt_inst, server_realm) == 0) + break; + krb5_free_principal(context, tmp_creds.server); + ret = krb5_make_principal(context, &tmp_creds.server, + tgt_inst, KRB5_TGS_NAME, server_realm, NULL); + if(ret) { + krb5_free_principal(context, tmp_creds.server); + krb5_free_principal(context, tmp_creds.client); + return ret; + } + ret = krb5_free_creds(context, tgt); + if(ret) { + krb5_free_principal(context, tmp_creds.server); + krb5_free_principal(context, tmp_creds.client); + return ret; + } + } + + krb5_free_principal(context, tmp_creds.server); + krb5_free_principal(context, tmp_creds.client); + *out_creds = calloc(1, sizeof(**out_creds)); + if(*out_creds == NULL) { + ret = ENOMEM; + krb5_set_error_message(context, ret, "malloc: out of memory"); + } else { + ret = get_cred_kdc_address (context, ccache, flags, NULL, + in_creds, tgt, impersonate_principal, + second_ticket, *out_creds); + if (ret) { + free (*out_creds); + *out_creds = NULL; + } + } + krb5_free_creds(context, tgt); + return ret; +} + +static krb5_error_code +get_cred_kdc_referral(krb5_context context, + krb5_kdc_flags flags, + krb5_ccache ccache, + krb5_creds *in_creds, + krb5_principal impersonate_principal, + Ticket *second_ticket, + krb5_creds **out_creds, + krb5_creds ***ret_tgts) +{ + krb5_const_realm client_realm; + krb5_error_code ret; + krb5_creds tgt, referral, ticket; + int loop = 0; + + memset(&tgt, 0, sizeof(tgt)); + memset(&ticket, 0, sizeof(ticket)); + + flags.b.canonicalize = 1; + + *out_creds = NULL; + + client_realm = krb5_principal_get_realm(context, in_creds->client); + + /* find tgt for the clients base realm */ + { + krb5_principal tgtname; + + ret = krb5_make_principal(context, &tgtname, + client_realm, + KRB5_TGS_NAME, + client_realm, + NULL); + if(ret) + return ret; + + ret = find_cred(context, ccache, tgtname, *ret_tgts, &tgt); + krb5_free_principal(context, tgtname); + if (ret) + return ret; + } + + referral = *in_creds; + ret = krb5_copy_principal(context, in_creds->server, &referral.server); + if (ret) { + krb5_free_cred_contents(context, &tgt); + return ret; + } + ret = krb5_principal_set_realm(context, referral.server, client_realm); + if (ret) { + krb5_free_cred_contents(context, &tgt); + krb5_free_principal(context, referral.server); + return ret; + } + + while (loop++ < 17) { + krb5_creds **tickets; + krb5_creds mcreds; + char *referral_realm; + + /* Use cache if we are not doing impersonation or contrainte deleg */ + if (impersonate_principal == NULL || flags.b.constrained_delegation) { + krb5_cc_clear_mcred(&mcreds); + mcreds.server = referral.server; + ret = krb5_cc_retrieve_cred(context, ccache, 0, &mcreds, &ticket); + } else + ret = EINVAL; + + if (ret) { + ret = get_cred_kdc_address (context, ccache, flags, NULL, + &referral, &tgt, impersonate_principal, + second_ticket, &ticket); + if (ret) + goto out; + } + + /* Did we get the right ticket ? */ + if (krb5_principal_compare_any_realm(context, + referral.server, + ticket.server)) + break; + + if (ticket.server->name.name_string.len != 2 && + strcmp(ticket.server->name.name_string.val[0], KRB5_TGS_NAME) != 0) + { + krb5_set_error_message(context, KRB5KRB_AP_ERR_NOT_US, + "Got back an non krbtgt ticket referrals"); + krb5_free_cred_contents(context, &ticket); + return KRB5KRB_AP_ERR_NOT_US; + } + + referral_realm = ticket.server->name.name_string.val[1]; + + /* check that there are no referrals loops */ + tickets = *ret_tgts; + + krb5_cc_clear_mcred(&mcreds); + mcreds.server = ticket.server; + + while(tickets && *tickets){ + if(krb5_compare_creds(context, + KRB5_TC_DONT_MATCH_REALM, + &mcreds, + *tickets)) + { + krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP, + "Referral from %s loops back to realm %s", + tgt.server->realm, + referral_realm); + krb5_free_cred_contents(context, &ticket); + return KRB5_GET_IN_TKT_LOOP; + } + tickets++; + } + + ret = add_cred(context, &ticket, ret_tgts); + if (ret) { + krb5_free_cred_contents(context, &ticket); + goto out; + } + + /* try realm in the referral */ + ret = krb5_principal_set_realm(context, + referral.server, + referral_realm); + krb5_free_cred_contents(context, &tgt); + tgt = ticket; + memset(&ticket, 0, sizeof(ticket)); + if (ret) + goto out; + } + + ret = krb5_copy_creds(context, &ticket, out_creds); + +out: + krb5_free_principal(context, referral.server); + krb5_free_cred_contents(context, &tgt); + return ret; +} + + +/* + * Glue function between referrals version and old client chasing + * codebase. + */ + +static krb5_error_code +get_cred_kdc_any(krb5_context context, + krb5_kdc_flags flags, + krb5_ccache ccache, + krb5_creds *in_creds, + krb5_principal impersonate_principal, + Ticket *second_ticket, + krb5_creds **out_creds, + krb5_creds ***ret_tgts) +{ + krb5_error_code ret; + + ret = get_cred_kdc_referral(context, + flags, + ccache, + in_creds, + impersonate_principal, + second_ticket, + out_creds, + ret_tgts); + if (ret == 0 || flags.b.canonicalize) + return ret; + return get_cred_kdc_capath(context, + flags, + ccache, + in_creds, + impersonate_principal, + second_ticket, + out_creds, + ret_tgts); +} + + +krb5_error_code KRB5_LIB_FUNCTION +krb5_get_cred_from_kdc_opt(krb5_context context, + krb5_ccache ccache, + krb5_creds *in_creds, + krb5_creds **out_creds, + krb5_creds ***ret_tgts, + krb5_flags flags) +{ + krb5_kdc_flags f; + f.i = flags; + return get_cred_kdc_any(context, f, ccache, + in_creds, NULL, NULL, + out_creds, ret_tgts); +} + +krb5_error_code KRB5_LIB_FUNCTION +krb5_get_cred_from_kdc(krb5_context context, + krb5_ccache ccache, + krb5_creds *in_creds, + krb5_creds **out_creds, + krb5_creds ***ret_tgts) +{ + return krb5_get_cred_from_kdc_opt(context, ccache, + in_creds, out_creds, ret_tgts, 0); +} + + +krb5_error_code KRB5_LIB_FUNCTION +krb5_get_credentials_with_flags(krb5_context context, + krb5_flags options, + krb5_kdc_flags flags, + krb5_ccache ccache, + krb5_creds *in_creds, + krb5_creds **out_creds) +{ + krb5_error_code ret; + krb5_creds **tgts; + krb5_creds *res_creds; + int i; + + *out_creds = NULL; + res_creds = calloc(1, sizeof(*res_creds)); + if (res_creds == NULL) { + krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); + return ENOMEM; + } + + if (in_creds->session.keytype) + options |= KRB5_TC_MATCH_KEYTYPE; + + /* + * If we got a credential, check if credential is expired before + * returning it. + */ + ret = krb5_cc_retrieve_cred(context, + ccache, + in_creds->session.keytype ? + KRB5_TC_MATCH_KEYTYPE : 0, + in_creds, res_creds); + /* + * If we got a credential, check if credential is expired before + * returning it, but only if KRB5_GC_EXPIRED_OK is not set. + */ + if (ret == 0) { + krb5_timestamp timeret; + + /* If expired ok, don't bother checking */ + if(options & KRB5_GC_EXPIRED_OK) { + *out_creds = res_creds; + return 0; + } + + krb5_timeofday(context, &timeret); + if(res_creds->times.endtime > timeret) { + *out_creds = res_creds; + return 0; + } + if(options & KRB5_GC_CACHED) + krb5_cc_remove_cred(context, ccache, 0, res_creds); + + } else if(ret != KRB5_CC_END) { + free(res_creds); + return ret; + } + free(res_creds); + if(options & KRB5_GC_CACHED) + return not_found(context, in_creds->server, KRB5_CC_NOTFOUND); + + if(options & KRB5_GC_USER_USER) + flags.b.enc_tkt_in_skey = 1; + if (flags.b.enc_tkt_in_skey) + options |= KRB5_GC_NO_STORE; + + tgts = NULL; + ret = get_cred_kdc_any(context, flags, ccache, + in_creds, NULL, NULL, out_creds, &tgts); + for(i = 0; tgts && tgts[i]; i++) { + krb5_cc_store_cred(context, ccache, tgts[i]); + krb5_free_creds(context, tgts[i]); + } + free(tgts); + if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0) + krb5_cc_store_cred(context, ccache, *out_creds); + return ret; +} + +krb5_error_code KRB5_LIB_FUNCTION +krb5_get_credentials(krb5_context context, + krb5_flags options, + krb5_ccache ccache, + krb5_creds *in_creds, + krb5_creds **out_creds) +{ + krb5_kdc_flags flags; + flags.i = 0; + return krb5_get_credentials_with_flags(context, options, flags, + ccache, in_creds, out_creds); +} + +struct krb5_get_creds_opt_data { + krb5_principal self; + krb5_flags options; + krb5_enctype enctype; + Ticket *ticket; +}; + + +krb5_error_code KRB5_LIB_FUNCTION +krb5_get_creds_opt_alloc(krb5_context context, krb5_get_creds_opt *opt) +{ + *opt = calloc(1, sizeof(**opt)); + if (*opt == NULL) { + krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); + return ENOMEM; + } + return 0; +} + +void KRB5_LIB_FUNCTION +krb5_get_creds_opt_free(krb5_context context, krb5_get_creds_opt opt) +{ + if (opt->self) + krb5_free_principal(context, opt->self); + memset(opt, 0, sizeof(*opt)); + free(opt); +} + +void KRB5_LIB_FUNCTION +krb5_get_creds_opt_set_options(krb5_context context, + krb5_get_creds_opt opt, + krb5_flags options) +{ + opt->options = options; +} + +void KRB5_LIB_FUNCTION +krb5_get_creds_opt_add_options(krb5_context context, + krb5_get_creds_opt opt, + krb5_flags options) +{ + opt->options |= options; +} + +void KRB5_LIB_FUNCTION +krb5_get_creds_opt_set_enctype(krb5_context context, + krb5_get_creds_opt opt, + krb5_enctype enctype) +{ + opt->enctype = enctype; +} + +krb5_error_code KRB5_LIB_FUNCTION +krb5_get_creds_opt_set_impersonate(krb5_context context, + krb5_get_creds_opt opt, + krb5_const_principal self) +{ + if (opt->self) + krb5_free_principal(context, opt->self); + return krb5_copy_principal(context, self, &opt->self); +} + +krb5_error_code KRB5_LIB_FUNCTION +krb5_get_creds_opt_set_ticket(krb5_context context, + krb5_get_creds_opt opt, + const Ticket *ticket) +{ + if (opt->ticket) { + free_Ticket(opt->ticket); + free(opt->ticket); + opt->ticket = NULL; + } + if (ticket) { + krb5_error_code ret; + + opt->ticket = malloc(sizeof(*ticket)); + if (opt->ticket == NULL) { + krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); + return ENOMEM; + } + ret = copy_Ticket(ticket, opt->ticket); + if (ret) { + free(opt->ticket); + opt->ticket = NULL; + krb5_set_error_message(context, ret, "malloc: out of memory"); + return ret; + } + } + return 0; +} + + + +krb5_error_code KRB5_LIB_FUNCTION +krb5_get_creds(krb5_context context, + krb5_get_creds_opt opt, + krb5_ccache ccache, + krb5_const_principal inprinc, + krb5_creds **out_creds) +{ + krb5_kdc_flags flags; + krb5_flags options; + krb5_creds in_creds; + krb5_error_code ret; + krb5_creds **tgts; + krb5_creds *res_creds; + int i; + + memset(&in_creds, 0, sizeof(in_creds)); + in_creds.server = rk_UNCONST(inprinc); + + ret = krb5_cc_get_principal(context, ccache, &in_creds.client); + if (ret) + return ret; + + options = opt->options; + flags.i = 0; + + *out_creds = NULL; + res_creds = calloc(1, sizeof(*res_creds)); + if (res_creds == NULL) { + krb5_free_principal(context, in_creds.client); + krb5_set_error_message(context, ENOMEM, "malloc: out of memory"); + return ENOMEM; + } + + if (opt->enctype) { + in_creds.session.keytype = opt->enctype; + options |= KRB5_TC_MATCH_KEYTYPE; + } + + /* + * If we got a credential, check if credential is expired before + * returning it. + */ + ret = krb5_cc_retrieve_cred(context, + ccache, + opt->enctype ? KRB5_TC_MATCH_KEYTYPE : 0, + &in_creds, res_creds); + /* + * If we got a credential, check if credential is expired before + * returning it, but only if KRB5_GC_EXPIRED_OK is not set. + */ + if (ret == 0) { + krb5_timestamp timeret; + + /* If expired ok, don't bother checking */ + if(options & KRB5_GC_EXPIRED_OK) { + *out_creds = res_creds; + krb5_free_principal(context, in_creds.client); + return 0; + } + + krb5_timeofday(context, &timeret); + if(res_creds->times.endtime > timeret) { + *out_creds = res_creds; + krb5_free_principal(context, in_creds.client); + return 0; + } + if(options & KRB5_GC_CACHED) + krb5_cc_remove_cred(context, ccache, 0, res_creds); + + } else if(ret != KRB5_CC_END) { + free(res_creds); + krb5_free_principal(context, in_creds.client); + return ret; + } + free(res_creds); + if(options & KRB5_GC_CACHED) { + krb5_free_principal(context, in_creds.client); + return not_found(context, in_creds.server, KRB5_CC_NOTFOUND); + } + if(options & KRB5_GC_USER_USER) { + flags.b.enc_tkt_in_skey = 1; + options |= KRB5_GC_NO_STORE; + } + if (options & KRB5_GC_FORWARDABLE) + flags.b.forwardable = 1; + if (options & KRB5_GC_NO_TRANSIT_CHECK) + flags.b.disable_transited_check = 1; + if (options & KRB5_GC_CONSTRAINED_DELEGATION) { + flags.b.request_anonymous = 1; /* XXX ARGH confusion */ + flags.b.constrained_delegation = 1; + } + if (options & KRB5_GC_CANONICALIZE) + flags.b.canonicalize = 1; + + tgts = NULL; + ret = get_cred_kdc_any(context, flags, ccache, + &in_creds, opt->self, opt->ticket, + out_creds, &tgts); + krb5_free_principal(context, in_creds.client); + for(i = 0; tgts && tgts[i]; i++) { + krb5_cc_store_cred(context, ccache, tgts[i]); + krb5_free_creds(context, tgts[i]); + } + free(tgts); + if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0) + krb5_cc_store_cred(context, ccache, *out_creds); + return ret; +} + +/* + * + */ + +krb5_error_code KRB5_LIB_FUNCTION +krb5_get_renewed_creds(krb5_context context, + krb5_creds *creds, + krb5_const_principal client, + krb5_ccache ccache, + const char *in_tkt_service) +{ + krb5_error_code ret; + krb5_kdc_flags flags; + krb5_creds in, *template, *out = NULL; + + memset(&in, 0, sizeof(in)); + memset(creds, 0, sizeof(*creds)); + + ret = krb5_copy_principal(context, client, &in.client); + if (ret) + return ret; + + if (in_tkt_service) { + ret = krb5_parse_name(context, in_tkt_service, &in.server); + if (ret) { + krb5_free_principal(context, in.client); + return ret; + } + } else { + const char *realm = krb5_principal_get_realm(context, client); + + ret = krb5_make_principal(context, &in.server, realm, KRB5_TGS_NAME, + realm, NULL); + if (ret) { + krb5_free_principal(context, in.client); + return ret; + } + } + + flags.i = 0; + flags.b.renewable = flags.b.renew = 1; + + /* + * Get template from old credential cache for the same entry, if + * this failes, no worries. + */ + ret = krb5_get_credentials(context, KRB5_GC_CACHED, ccache, &in, &template); + if (ret == 0) { + flags.b.forwardable = template->flags.b.forwardable; + flags.b.proxiable = template->flags.b.proxiable; + krb5_free_creds (context, template); + } + + ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &in, &out); + krb5_free_principal(context, in.client); + krb5_free_principal(context, in.server); + if (ret) + return ret; + + ret = krb5_copy_creds_contents(context, out, creds); + krb5_free_creds(context, out); + + return ret; +} |