diff options
Diffstat (limited to 'third_party/heimdal/lib/krb5/get_cred.c')
| -rw-r--r-- | third_party/heimdal/lib/krb5/get_cred.c | 2044 |
1 files changed, 2044 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/krb5/get_cred.c b/third_party/heimdal/lib/krb5/get_cred.c new file mode 100644 index 0000000..ff06325 --- /dev/null +++ b/third_party/heimdal/lib/krb5/get_cred.c @@ -0,0 +1,2044 @@ +/* + * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Portions Copyright (c) 2009 - 2010 Apple Inc. 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" +#include <assert.h> + +static krb5_error_code +get_cred_kdc_capath(krb5_context, krb5_kdc_flags, + krb5_ccache, struct krb5_fast_state *, + krb5_creds *, krb5_principal, + Ticket *, const char *, const char *, + krb5_creds **, krb5_creds ***); + +/* + * 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, + krb5_ccache ccache, + krb5_creds *creds, + krb5_data *tgs_req) +{ + krb5_error_code ret; + krb5_data in_data; + size_t buf_size; + size_t len = 0; + uint8_t *buf; + + ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, body, &len, ret); + if (ret) + return ret; + + 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, tgs_req, + KRB5_KU_TGS_REQ_AUTH_CKSUM, + KRB5_KU_TGS_REQ_AUTH); + free (buf); + return ret; +} + +/* + * 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 *subkey) +{ + if(authdata->len) { + size_t len = 0, 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); + return krb5_enomem(context); + } + ret = krb5_crypto_init(context, subkey, 0, &crypto); + if (ret) { + free (buf); + free (req_body->enc_authorization_data); + req_body->enc_authorization_data = NULL; + return ret; + } + ret = krb5_encrypt_EncryptedData(context, + crypto, + KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY, + buf, + len, + 0, + req_body->enc_authorization_data); + free (buf); + krb5_crypto_destroy(context, crypto); + return ret; + } 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, + struct krb5_fast_state *state, + 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_auth_context ac = NULL; + krb5_error_code ret = 0; + krb5_data tgs_req; + + krb5_data_zero(&tgs_req); + 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 = krb5_enomem(context); + goto fail; + } + t->req_body.etype.val[0] = in_creds->session.keytype; + } else { + ret = _krb5_init_etype(context, + KRB5_PDU_TGS_REQUEST, + &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; + t->req_body.kdc_options.forwardable = krbtgt->flags.b.forwardable; + t->req_body.kdc_options.renewable = krbtgt->flags.b.renewable; + t->req_body.kdc_options.proxiable = krbtgt->flags.b.proxiable; + 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 = krb5_enomem(context); + 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; + + if (krbtgt->times.starttime) { + ALLOC(t->req_body.from, 1); + if(t->req_body.from == NULL){ + ret = krb5_enomem(context); + goto fail; + } + *t->req_body.from = in_creds->times.starttime; + } + + /* 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 = krb5_enomem(context); + goto fail; + } + *t->req_body.till = in_creds->times.endtime; + + if (t->req_body.kdc_options.renewable && krbtgt->times.renew_till) { + ALLOC(t->req_body.rtime, 1); + if(t->req_body.rtime == NULL){ + ret = krb5_enomem(context); + goto fail; + } + *t->req_body.rtime = in_creds->times.renew_till; + } + + t->req_body.nonce = nonce; + if(second_ticket){ + ALLOC(t->req_body.additional_tickets, 1); + if (t->req_body.additional_tickets == NULL) { + ret = krb5_enomem(context); + goto fail; + } + ALLOC_SEQ(t->req_body.additional_tickets, 1); + if (t->req_body.additional_tickets->val == NULL) { + ret = krb5_enomem(context); + goto fail; + } + ret = copy_Ticket(second_ticket, t->req_body.additional_tickets->val); + if (ret) + goto fail; + } + + ret = krb5_auth_con_init(context, &ac); + if(ret) + goto fail; + + ret = krb5_auth_con_generatelocalsubkey(context, ac, &krbtgt->session); + if (ret) + goto fail; + + if (state) { + krb5_data empty; + + krb5_data_zero(&empty); + ret = krb5_auth_con_add_AuthorizationData(context, ac, + KRB5_AUTHDATA_FX_FAST_USED, + &empty); + if (ret) + goto fail; + } + + ret = set_auth_data(context, &t->req_body, + &in_creds->authdata, ac->local_subkey); + if (ret) + goto fail; + + ret = make_pa_tgs_req(context, + &ac, + &t->req_body, + ccache, + krbtgt, + &tgs_req); + if(ret) + goto fail; + + /* + * Add KRB5_PADATA_TGS_REQ first + * followed by all others. + */ + + if (t->padata == NULL) { + ALLOC(t->padata, 1); + if (t->padata == NULL) { + ret = krb5_enomem(context); + goto fail; + } + } + + ret = krb5_padata_add(context, t->padata, KRB5_PADATA_TGS_REQ, + tgs_req.data, tgs_req.length); + if (ret) + goto fail; + + krb5_data_zero(&tgs_req); + + { + size_t i; + for (i = 0; i < padata->len; i++) { + const PA_DATA *val1 = &padata->val[i]; + PA_DATA val2; + + ret = copy_PA_DATA(val1, &val2); + if (ret) { + krb5_set_error_message(context, ret, + N_("malloc: out of memory", "")); + goto fail; + } + + ret = krb5_padata_add(context, t->padata, + val2.padata_type, + val2.padata_value.data, + val2.padata_value.length); + if (ret) { + free_PA_DATA(&val2); + + krb5_set_error_message(context, ret, + N_("malloc: out of memory", "")); + goto fail; + } + } + } + + if (state) { + state->armor_ac = ac; + ret = _krb5_fast_create_armor(context, state, NULL); + state->armor_ac = NULL; + if (ret) + goto fail; + + ret = _krb5_fast_wrap_req(context, state, t); + if (ret) + goto fail; + + /* Its ok if there is no fast in the TGS-REP, older heimdal only support it in the AS code path */ + state->flags &= ~KRB5_FAST_EXPECTED; + } + + ret = krb5_auth_con_getlocalsubkey(context, ac, subkey); + if (ret) + goto fail; + +fail: + if (ac) + krb5_auth_con_free(context, ac); + if (ret) { + t->req_body.addresses = NULL; + free_TGS_REQ (t); + } + krb5_data_free(&tgs_req); + + return ret; +} + +KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +_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; + + if (realm == NULL) + realm = tmp_cred.client->realm; + + 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; + } + /* + * The forwardable TGT might not be the start TGT, in which case, it is + * generally, but not always already cached. Just in case, get it again if + * lost. + */ + ret = krb5_get_credentials(context, + 0, + id, + &tmp_cred, + cred); + krb5_free_principal(context, tmp_cred.client); + krb5_free_principal(context, tmp_cred.server); + if(ret) + return ret; + return 0; +} + +static krb5_error_code +fast_tgs_strengthen_key(krb5_context context, + struct krb5_fast_state *state, + krb5_keyblock *reply_key, + krb5_keyblock *extract_key) +{ + krb5_error_code ret; + + if (state && state->strengthen_key) { + _krb5_debug(context, 5, "_krb5_fast_tgs_strengthen_key"); + + if (state->strengthen_key->keytype != reply_key->keytype) { + krb5_set_error_message(context, KRB5KRB_AP_ERR_MODIFIED, + N_("strengthen_key %d not same enctype as reply key %d", ""), + state->strengthen_key->keytype, reply_key->keytype); + return KRB5KRB_AP_ERR_MODIFIED; + } + + ret = _krb5_fast_cf2(context, + state->strengthen_key, + "strengthenkey", + reply_key, + "replykey", + extract_key, + NULL); + if (ret) + return ret; + } else { + ret = krb5_copy_keyblock_contents(context, reply_key, extract_key); + if (ret) + return ret; + } + + return 0; +} + +/* DCE compatible decrypt proc */ +static krb5_error_code KRB5_CALLCONV +decrypt_tkt_with_subkey (krb5_context context, + krb5_keyblock *key, + krb5_key_usage usage, + krb5_const_pointer skey, + krb5_kdc_rep *dec_rep) +{ + struct krb5_decrypt_tkt_with_subkey_state *state; + krb5_error_code ret = 0; + krb5_data data; + size_t size; + krb5_crypto crypto; + krb5_keyblock extract_key; + + state = (struct krb5_decrypt_tkt_with_subkey_state *)skey; + + assert(usage == 0); + + krb5_data_zero(&data); + + /* + * start out with trying with subkey if we have one + */ + if (state->subkey) { + ret = fast_tgs_strengthen_key(context, state->fast_state, + state->subkey, &extract_key); + if (ret) + return ret; + + ret = krb5_crypto_init(context, &extract_key, 0, &crypto); + krb5_free_keyblock_contents(context, &extract_key); + 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); + /* + * If the is Windows 2000 DC, we need to retry with key usage + * 8 when doing ARCFOUR. + */ + if (ret && state->subkey->keytype == ETYPE_ARCFOUR_HMAC_MD5) { + ret = krb5_decrypt_EncryptedData(context, + crypto, + 8, + &dec_rep->kdc_rep.enc_part, + &data); + } + krb5_crypto_destroy(context, crypto); + } + if (state->subkey == NULL || ret) { + ret = fast_tgs_strengthen_key(context, state->fast_state, key, &extract_key); + if (ret) + return ret; + + ret = krb5_crypto_init(context, key, 0, &crypto); + if (ret) + return ret; + ret = krb5_decrypt_EncryptedData (context, + crypto, + KRB5_KU_TGS_REP_ENC_PART_SESSION, + &dec_rep->kdc_rep.enc_part, + &data); + krb5_crypto_destroy(context, crypto); + } + if (ret) + return ret; + + ret = decode_EncASRepPart(data.data, + data.length, + &dec_rep->enc_part, + &size); + if (ret) + ret = decode_EncTGSRepPart(data.data, + data.length, + &dec_rep->enc_part, + &size); + if (ret) + krb5_set_error_message(context, ret, + N_("Failed to decode encpart in ticket", "")); + krb5_data_free (&data); + return ret; +} + +static krb5_error_code +get_cred_kdc(krb5_context context, + krb5_ccache id, + struct krb5_fast_state *fast_state, + krb5_kdc_flags flags, + krb5_addresses *addresses, + krb5_creds *in_creds, + krb5_creds *krbtgt, + krb5_principal impersonate_principal, + Ticket *second_ticket, + const char *kdc_hostname, + const char *sitename, + krb5_creds *out_creds) +{ + TGS_REQ req; + krb5_data enc; + krb5_data resp; + krb5_kdc_rep rep; + krb5_error_code ret; + unsigned nonce; + krb5_keyblock *subkey = NULL; + size_t len = 0; + Ticket second_ticket_data; + METHOD_DATA padata; + + memset(&rep, 0, sizeof(rep)); + 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 = 0; + + 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_FOR_USER, buf, len); + if (ret) + goto out; + } + + ret = init_tgs_req (context, + id, + fast_state, + 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); + + if (kdc_hostname) + krb5_sendto_set_hostname(context, stctx, kdc_hostname); + if (sitename) + krb5_sendto_set_sitename(context, stctx, sitename); + + 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; + + if(decode_TGS_REP(resp.data, resp.length, &rep.kdc_rep, &len) == 0) { + struct krb5_decrypt_tkt_with_subkey_state state; + unsigned eflags = 0; + krb5_data data; + size_t size; + + ASN1_MALLOC_ENCODE(Ticket, data.data, data.length, + &rep.kdc_rep.ticket, &size, ret); + if (ret) + goto out; + heim_assert(data.length == size, "ASN.1 internal error"); + + ret = _krb5_fast_unwrap_kdc_rep(context, nonce, &data, + fast_state, &rep.kdc_rep); + krb5_data_free(&data); + if (ret) + goto out; + + ret = krb5_copy_principal(context, + in_creds->client, + &out_creds->client); + if(ret) + goto out; + ret = krb5_copy_principal(context, + in_creds->server, + &out_creds->server); + if(ret) + goto out; + /* this should go someplace else */ + out_creds->times.endtime = in_creds->times.endtime; + + /* XXX should do better testing */ + if (flags.b.cname_in_addl_tkt || impersonate_principal) + eflags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH; + if (flags.b.request_anonymous) + eflags |= EXTRACT_TICKET_MATCH_ANON; + + state.subkey = subkey; + state.fast_state = fast_state; + + ret = _krb5_extract_ticket(context, + &rep, + out_creds, + &krbtgt->session, + NULL, + 0, + &krbtgt->addresses, + nonce, + eflags, + NULL, + decrypt_tkt_with_subkey, + &state); + } else if(krb5_rd_error(context, &resp, &rep.error) == 0) { + METHOD_DATA md; + + memset(&md, 0, sizeof(md)); + + if (rep.error.e_data) { + KERB_ERROR_DATA kerb_error_data; + + memset(&kerb_error_data, 0, sizeof(kerb_error_data)); + + /* First try to decode the e-data as KERB-ERROR-DATA. */ + ret = decode_KERB_ERROR_DATA(rep.error.e_data->data, + rep.error.e_data->length, + &kerb_error_data, + &len); + if (ret) { + /* That failed, so try to decode it as METHOD-DATA. */ + ret = decode_METHOD_DATA(rep.error.e_data->data, + rep.error.e_data->length, + &md, NULL); + if (ret) { + krb5_set_error_message(context, ret, + N_("Failed to decode METHOD-DATA", "")); + goto out; + } + } else if (len != rep.error.e_data->length) { + /* Trailing data — just ignore the error. */ + free_KERB_ERROR_DATA(&kerb_error_data); + } else { + /* OK. */ + free_KERB_ERROR_DATA(&kerb_error_data); + } + } + + ret = _krb5_fast_unwrap_error(context, nonce, fast_state, &md, &rep.error); + free_METHOD_DATA(&md); + if (ret) + goto out; + + ret = krb5_error_from_rd_error(context, &rep.error, in_creds); + + /* log the failure */ + if (_krb5_have_debug(context, 5)) { + const char *str = krb5_get_error_message(context, ret); + _krb5_debug(context, 5, "parse_tgs_rep: KRB-ERROR %d/%s", ret, str); + krb5_free_error_message(context, str); + } + } else if(resp.length > 0 && ((char*)resp.data)[0] == 4) { + ret = KRB5KRB_AP_ERR_V4_REPLY; + krb5_clear_error_message(context); + } else { + ret = KRB5KRB_AP_ERR_MSG_TYPE; + krb5_clear_error_message(context); + } + +out: + krb5_free_kdc_rep(context, &rep); + 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(context, 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, + struct krb5_fast_state *fast_state, + krb5_kdc_flags flags, + krb5_addresses *addrs, + krb5_creds *in_creds, + krb5_creds *krbtgt, + krb5_principal impersonate_principal, + Ticket *second_ticket, + const char *kdc_hostname, + const char *sitename, + 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) { + ret = krb5_get_all_client_addrs(context, &addresses); + if (ret) + return ret; + /* XXX this sucks. */ + addrs = &addresses; + if(addresses.len == 0) + addrs = NULL; + } + } + ret = get_cred_kdc(context, id, fast_state, flags, addrs, + in_creds, krbtgt, impersonate_principal, + second_ticket, kdc_hostname, sitename, out_creds); + krb5_free_addresses(context, &addresses); + return ret; +} + +KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +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; + struct krb5_fast_state fast_state; + + memset(&fast_state, 0, sizeof(fast_state)); + + *out_creds = calloc(1, sizeof(**out_creds)); + if(*out_creds == NULL) + return krb5_enomem(context); + ret = _krb5_get_krbtgt (context, + id, + in_creds->server->realm, + &krbtgt); + if(ret) { + free(*out_creds); + *out_creds = NULL; + return ret; + } + ret = get_cred_kdc(context, id, &fast_state, flags, + addresses, in_creds, krbtgt, + NULL, NULL, NULL, NULL, *out_creds); + krb5_free_creds (context, krbtgt); + _krb5_fast_free(context, &fast_state); + if(ret) { + free(*out_creds); + *out_creds = NULL; + } + return ret; +} + +static int +not_found(krb5_context context, krb5_const_principal p, krb5_error_code code) +{ + krb5_error_code ret; + char *str; + const char *err; + + ret = krb5_unparse_name(context, p, &str); + if(ret) { + krb5_clear_error_message(context); + return code; + } + err = krb5_get_error_message(context, code); + krb5_set_error_message(context, code, N_("%s (%s)", ""), err, str); + krb5_free_error_message(context, err); + 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; + krb5_timeofday(context, &mcreds.times.endtime); + ret = krb5_cc_retrieve_cred(context, id, + KRB5_TC_DONT_MATCH_REALM | + KRB5_TC_MATCH_TIMES, + &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) + return krb5_enomem(context); + *tgts = tmp; + ret = krb5_copy_creds(context, tkt, &tmp[i]); + tmp[i+1] = NULL; + return ret; +} + +static krb5_error_code +get_cred_kdc_capath_worker(krb5_context context, + krb5_kdc_flags flags, + krb5_ccache ccache, + struct krb5_fast_state *fast_state, + krb5_creds *in_creds, + krb5_const_realm try_realm, + krb5_principal impersonate_principal, + Ticket *second_ticket, + const char *kdc_hostname, + const char *sitename, + krb5_creds **out_creds, + krb5_creds ***ret_tgts) +{ + krb5_error_code ret; + krb5_creds *tgt = NULL; + krb5_creds tmp_creds; + krb5_const_realm client_realm, server_realm; + int ok_as_delegate = 1; + + *out_creds = calloc(1, sizeof(**out_creds)); + if (*out_creds == NULL) + return krb5_enomem(context); + + memset(&tmp_creds, 0, sizeof(tmp_creds)); + + client_realm = krb5_principal_get_realm(context, in_creds->client); + server_realm = krb5_principal_get_realm(context, in_creds->server); + ret = krb5_copy_principal(context, in_creds->client, &tmp_creds.client); + if (ret) + goto out; + + ret = krb5_make_principal(context, + &tmp_creds.server, + try_realm, + KRB5_TGS_NAME, + server_realm, + NULL); + if (ret) + goto out; + + { + krb5_creds tgts; + + /* + * If we have krbtgt/server_realm@try_realm cached, use it and we're + * done. + */ + ret = find_cred(context, ccache, tmp_creds.server, + *ret_tgts, &tgts); + if (ret == 0) { + /* only allow implicit ok_as_delegate if the realm is the clients realm */ + if (strcmp(try_realm, client_realm) != 0 + || strcmp(try_realm, server_realm) != 0) { + ok_as_delegate = tgts.flags.b.ok_as_delegate; + } + + ret = get_cred_kdc_address(context, ccache, fast_state, + flags, NULL, + in_creds, &tgts, + impersonate_principal, + second_ticket, + kdc_hostname, + sitename, + *out_creds); + krb5_free_cred_contents(context, &tgts); + if (ret == 0 && + !krb5_principal_compare(context, in_creds->server, + (*out_creds)->server)) { + ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN; + } + if (ret == 0 && ok_as_delegate == 0) + (*out_creds)->flags.b.ok_as_delegate = 0; + + goto out; + } + } + + if (krb5_realm_compare(context, in_creds->client, in_creds->server)) { + ret = not_found(context, in_creds->server, KRB5_CC_NOTFOUND); + goto out; + } + + /* + * XXX This can loop forever, plus we recurse, so we can't just keep a + * count here. The count would have to get passed around by reference. + * + * The KDCs check for transit loops for us, and capath data is finite, so + * in fact we'll fall out of this loop at some point. We should do our own + * transit loop checking (like get_cred_kdc_referral()), and we should + * impose a max number of iterations altogether. But barring malicious or + * broken KDCs, this is good enough. + */ + while (1) { + heim_general_string tgt_inst; + + ret = get_cred_kdc_capath(context, flags, ccache, fast_state, + &tmp_creds, NULL, NULL, + kdc_hostname, sitename, + &tgt, ret_tgts); + if (ret) + goto out; + + /* + * if either of the chain or the ok_as_delegate was stripped + * by the kdc, make sure we strip it too. + */ + if (ok_as_delegate == 0 || tgt->flags.b.ok_as_delegate == 0) { + ok_as_delegate = 0; + tgt->flags.b.ok_as_delegate = 0; + } + + ret = add_cred(context, tgt, ret_tgts); + if (ret) + goto out; + tgt_inst = tgt->server->name.name_string.val[1]; + if (strcmp(tgt_inst, server_realm) == 0) + break; + krb5_free_principal(context, tmp_creds.server); + tmp_creds.server = NULL; + ret = krb5_make_principal(context, &tmp_creds.server, + tgt_inst, KRB5_TGS_NAME, server_realm, NULL); + if (ret) + goto out; + ret = krb5_free_creds(context, tgt); + tgt = NULL; + if (ret) + goto out; + } + + ret = get_cred_kdc_address(context, ccache, fast_state, flags, NULL, + in_creds, tgt, impersonate_principal, + second_ticket, kdc_hostname, sitename, *out_creds); + if (ret == 0 && + !krb5_principal_compare(context, in_creds->server, + (*out_creds)->server)) { + krb5_free_cred_contents(context, *out_creds); + ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN; + } + if (ret == 0 && ok_as_delegate == 0) + (*out_creds)->flags.b.ok_as_delegate = 0; + +out: + if (ret) { + krb5_free_creds(context, *out_creds); + *out_creds = NULL; + } + if (tmp_creds.server) + krb5_free_principal(context, tmp_creds.server); + if (tmp_creds.client) + krb5_free_principal(context, tmp_creds.client); + if (tgt) + krb5_free_creds(context, tgt); + 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, + struct krb5_fast_state *fast_state, + krb5_creds *in_creds, + krb5_principal impersonate_principal, + Ticket *second_ticket, + const char *kdc_hostname, + const char *sitename, + krb5_creds **out_creds, + krb5_creds ***ret_tgts) +{ + krb5_error_code ret; + krb5_const_realm client_realm, server_realm, try_realm; + + client_realm = krb5_principal_get_realm(context, in_creds->client); + server_realm = krb5_principal_get_realm(context, in_creds->server); + + try_realm = client_realm; + ret = get_cred_kdc_capath_worker(context, flags, ccache, fast_state, + in_creds, try_realm, impersonate_principal, + second_ticket, kdc_hostname, sitename, + out_creds, ret_tgts); + + if (ret == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN) { + try_realm = krb5_config_get_string(context, NULL, "capaths", + client_realm, server_realm, NULL); + + if (try_realm != NULL && strcmp(try_realm, client_realm) != 0) { + ret = get_cred_kdc_capath_worker(context, flags, ccache, fast_state, + in_creds, try_realm, impersonate_principal, + second_ticket, kdc_hostname, sitename, + out_creds, ret_tgts); + } + } + + return ret; +} + +static krb5_boolean skip_referrals(krb5_principal server, + krb5_kdc_flags *flags) +{ + return server->name.name_string.len < 2 && !flags->b.canonicalize; +} + +/* + * Get a service ticket from a KDC by chasing referrals from a start realm. + * + * All referral TGTs produced in the process are thrown away when we're done. + * We don't store them, and we don't allow other search mechanisms (capaths) to + * use referral TGTs produced here. + */ +static krb5_error_code +get_cred_kdc_referral(krb5_context context, + krb5_kdc_flags flags, + krb5_ccache ccache, + struct krb5_fast_state *fast_state, + krb5_creds *in_creds, + krb5_principal impersonate_principal, + Ticket *second_ticket, + const char *kdc_hostname, + const char *sitename, + krb5_creds **out_creds) +{ + krb5_realm start_realm = NULL; + krb5_data config_start_realm; + krb5_error_code ret; + krb5_creds tgt, referral, ticket; + krb5_creds **referral_tgts = NULL; /* used for loop detection */ + int loop = 0; + int ok_as_delegate = 1; + int want_tgt; + size_t i; + + if (skip_referrals(in_creds->server, &flags)) { + krb5_set_error_message(context, KRB5KDC_ERR_PATH_NOT_ACCEPTED, + N_("Name too short to do referals, skipping", "")); + return KRB5KDC_ERR_PATH_NOT_ACCEPTED; + } + + memset(&tgt, 0, sizeof(tgt)); + memset(&ticket, 0, sizeof(ticket)); + + flags.b.canonicalize = 1; + + *out_creds = NULL; + + + ret = krb5_cc_get_config(context, ccache, NULL, "start_realm", &config_start_realm); + if (ret == 0) { + start_realm = strndup(config_start_realm.data, config_start_realm.length); + krb5_data_free(&config_start_realm); + } else { + start_realm = strdup(krb5_principal_get_realm(context, in_creds->client)); + } + if (start_realm == NULL) + return krb5_enomem(context); + + /* find tgt for the clients base realm */ + { + krb5_principal tgtname; + + ret = krb5_make_principal(context, &tgtname, + start_realm, + KRB5_TGS_NAME, + start_realm, + NULL); + if (ret) { + free(start_realm); + return ret; + } + + ret = find_cred(context, ccache, tgtname, NULL, &tgt); + krb5_free_principal(context, tgtname); + if (ret) { + free(start_realm); + return ret; + } + } + + /* + * If the desired service principal service/host@REALM is not a TGT, start + * by asking for a ticket for service/host@START_REALM and process referrals + * from there. + * + * However, when we ask for a TGT, krbtgt/A@B, we're actually looking for a + * path to realm B, so that we can explicitly obtain a ticket for krbtgt/A + * from B, and not some other realm. Therefore, in this case our starting + * point will be krbtgt/B@START_REALM. Only once we obtain a ticket for + * krbtgt/B@some-transit, do we switch to requesting krbtgt/A@B on our + * final request. + */ + referral = *in_creds; + want_tgt = in_creds->server->realm[0] != '\0' && + krb5_principal_is_krbtgt(context, in_creds->server); + if (!want_tgt) + ret = krb5_copy_principal(context, in_creds->server, &referral.server); + else + ret = krb5_make_principal(context, &referral.server, start_realm, + KRB5_TGS_NAME, in_creds->server->realm, NULL); + + if (ret) { + krb5_free_cred_contents(context, &tgt); + free(start_realm); + return ret; + } + if (!want_tgt) + ret = krb5_principal_set_realm(context, referral.server, start_realm); + free(start_realm); + start_realm = NULL; + 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 contrained deleg */ + if (impersonate_principal == NULL && !flags.b.cname_in_addl_tkt) { + krb5_cc_clear_mcred(&mcreds); + mcreds.server = referral.server; + krb5_timeofday(context, &mcreds.times.endtime); + ret = krb5_cc_retrieve_cred(context, ccache, KRB5_TC_MATCH_TIMES, + &mcreds, &ticket); + } else + ret = EINVAL; + + if (ret) { + ret = get_cred_kdc_address(context, ccache, fast_state, flags, NULL, + &referral, &tgt, impersonate_principal, + second_ticket, kdc_hostname, sitename, &ticket); + if (ret) + goto out; + } + + /* + * Did we get the right ticket? + * + * If we weren't asking for a TGT, then we don't mind if we took a realm + * change (referral.server has a referral realm, not necessarily the + * original). + * + * However, if we were looking for a TGT (which wouldn't be the start + * TGT, since that one must be in the ccache) then we actually want the + * one from the realm we wanted, since otherwise a _referral_ will + * confuse us and we will store that referral. In Heimdal we mostly + * never ask krb5_get_cred*() for TGTs, but some sites have code to ask + * for a ktbgt/REMOTE.REALM@REMOTE.REALM, and one could always use + * kgetcred(1) to get here asking for a krbtgt/C@D and we need to handle + * the case where last hop we get is krbtgt/C@B (in which case we must + * stop so we don't beat up on B for the remaining tries). + */ + if (!want_tgt && + krb5_principal_compare(context, referral.server, ticket.server)) + break; + + if (!krb5_principal_is_krbtgt(context, ticket.server)) { + krb5_set_error_message(context, KRB5KRB_AP_ERR_NOT_US, + N_("Got back an non krbtgt " + "ticket referrals", "")); + ret = KRB5KRB_AP_ERR_NOT_US; + goto out; + } + + referral_realm = ticket.server->name.name_string.val[1]; + + /* check that there are no referrals loops */ + tickets = referral_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, + N_("Referral from %s " + "loops back to realm %s", ""), + tgt.server->realm, + referral_realm); + ret = KRB5_GET_IN_TKT_LOOP; + goto out; + } + tickets++; + } + + /* + * if either of the chain or the ok_as_delegate was stripped + * by the kdc, make sure we strip it too. + */ + + if (ok_as_delegate == 0 || ticket.flags.b.ok_as_delegate == 0) { + ok_as_delegate = 0; + ticket.flags.b.ok_as_delegate = 0; + } + + _krb5_debug(context, 6, "get_cred_kdc_referral: got referral " + "to %s from %s", referral_realm, referral.server->realm); + ret = add_cred(context, &ticket, &referral_tgts); + if (ret) + goto out; + + /* try realm in the referral */ + if (!want_tgt || strcmp(referral_realm, in_creds->server->realm) != 0) + ret = krb5_principal_set_realm(context, + referral.server, + referral_realm); + else { + /* + * Now that we have a ticket for the desired realm, we reset + * want_tgt and reinstate the desired principal so that the we can + * match it and break out of the loop. + */ + want_tgt = 0; + krb5_free_principal(context, referral.server); + referral.server = NULL; + ret = krb5_copy_principal(context, in_creds->server, &referral.server); + } + 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: + for (i = 0; referral_tgts && referral_tgts[i]; i++) + krb5_free_creds(context, referral_tgts[i]); + free(referral_tgts); + krb5_free_principal(context, referral.server); + krb5_free_cred_contents(context, &tgt); + krb5_free_cred_contents(context, &ticket); + return ret; +} + + +/* + * Glue function between referrals version and old client chasing + * codebase. + */ + +KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +_krb5_get_cred_kdc_any(krb5_context context, + krb5_kdc_flags flags, + krb5_ccache ccache, + struct krb5_fast_state *fast_state, + krb5_creds *in_creds, + krb5_principal impersonate_principal, + Ticket *second_ticket, + krb5_creds **out_creds, + krb5_creds ***ret_tgts) +{ + char *kdc_hostname = NULL; + char *sitename = NULL; + krb5_error_code ret; + krb5_deltat offset; + krb5_data data; + + krb5_data_zero(&data); + + /* + * If we are using LKDC, lets pull out the addreses from the + * ticket and use that. + */ + + ret = krb5_cc_get_config(context, ccache, NULL, "lkdc-hostname", &data); + if (ret == 0) { + if ((kdc_hostname = strndup(data.data, data.length)) == NULL) { + ret = krb5_enomem(context); + goto out; + } + krb5_data_free(&data); + } + + ret = krb5_cc_get_config(context, ccache, NULL, "sitename", &data); + if (ret == 0) { + if ((sitename = strndup(data.data, data.length)) == NULL) { + ret = krb5_enomem(context); + goto out; + } + krb5_data_free(&data); + } + + ret = krb5_cc_get_kdc_offset(context, ccache, &offset); + if (ret == 0) { + context->kdc_sec_offset = offset; + context->kdc_usec_offset = 0; + } + + if (strcmp(in_creds->server->realm, "") != 0) { + /* + * Non-empty realm? Try capaths first. We might have local + * policy (capaths) to honor. + */ + ret = get_cred_kdc_capath(context, + flags, + ccache, + fast_state, + in_creds, + impersonate_principal, + second_ticket, + kdc_hostname, + sitename, + out_creds, + ret_tgts); + if (ret == 0 || skip_referrals(in_creds->server, &flags)) + goto out; + } + + /* Otherwise try referrals */ + ret = get_cred_kdc_referral(context, + flags, + ccache, + fast_state, + in_creds, + impersonate_principal, + second_ticket, + kdc_hostname, + sitename, + out_creds); + +out: + krb5_data_free(&data); + free(kdc_hostname); + free(sitename); + return ret; +} + +static krb5_error_code +check_cc(krb5_context context, krb5_flags options, krb5_ccache ccache, + krb5_creds *in_creds, krb5_creds *out_creds) +{ + krb5_error_code ret; + krb5_timestamp now; + krb5_creds mcreds = *in_creds; + + krb5_timeofday(context, &now); + + if (!(options & KRB5_GC_EXPIRED_OK) && + mcreds.times.endtime < now) { + mcreds.times.renew_till = 0; + krb5_timeofday(context, &mcreds.times.endtime); + options |= KRB5_TC_MATCH_TIMES; + } + + if (mcreds.server->name.name_type == KRB5_NT_SRV_HST_NEEDS_CANON) { + /* Avoid name canonicalization in krb5_cc_retrieve_cred() */ + krb5_principal_set_type(context, mcreds.server, KRB5_NT_SRV_HST); + } + + if (options & KRB5_GC_ANONYMOUS) { + ret = krb5_make_principal(context, + &mcreds.client, + krb5_principal_get_realm(context, mcreds.client), + KRB5_WELLKNOWN_NAME, + KRB5_ANON_NAME, + NULL); + if (ret) + return ret; + } + + ret = krb5_cc_retrieve_cred(context, ccache, + (options & + (KRB5_TC_DONT_MATCH_REALM | + KRB5_TC_MATCH_KEYTYPE | + KRB5_TC_MATCH_TIMES)), + &mcreds, out_creds); + + if (options & KRB5_GC_ANONYMOUS) + krb5_free_principal(context, mcreds.client); + + if (ret == 0 && out_creds->server->realm && + out_creds->server->realm[0] == '\0') { + Ticket ticket; + + /* + * We only write tickets to the ccache that have been validated, as in, + * the sname/srealm from the KDC-REP enc-part have been checked to + * match the sname/realm from the Ticket from the KDC-REP. + * + * Our caller needs the canonical realm of the service in order to be + * able to get forwarded credentials for it when destination-TGT + * forwarding is enabled. + * + * As well, gss_init_sec_context() ought to arrange for + * gss_inquire_context() to output the canonical acceptor name on the + * initiator side. + */ + ret = decode_Ticket(out_creds->ticket.data, out_creds->ticket.length, + &ticket, NULL); + if (ret == 0) { + ret = krb5_principal_set_realm(context, out_creds->server, + ticket.realm); + free_Ticket(&ticket); + } else { + krb5_free_cred_contents(context, out_creds); + } + } + return ret; +} + +static void +store_cred(krb5_context context, krb5_ccache ccache, + krb5_const_principal server_princ, krb5_creds *creds) +{ + if (context->no_ticket_store) + return; + if (!krb5_principal_compare(context, creds->server, server_princ) && + !krb5_principal_is_krbtgt(context, server_princ)) { + krb5_principal tmp_princ = creds->server; + /* + * Store the cred with the pre-canon server princ first so it + * can be found quickly in the future. + */ + creds->server = (krb5_principal)server_princ; + krb5_cc_store_cred(context, ccache, creds); + creds->server = tmp_princ; + /* Then store again with the canonicalized server princ */ + } + krb5_cc_store_cred(context, ccache, creds); +} + + +KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +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) +{ + struct krb5_fast_state fast_state; + krb5_error_code ret; + krb5_name_canon_iterator name_canon_iter = NULL; + krb5_name_canon_rule_options rule_opts; + krb5_const_principal try_princ = NULL; + krb5_principal save_princ = in_creds->server; + krb5_creds **tgts; + krb5_creds *res_creds; + int i; + + memset(&fast_state, 0, sizeof(fast_state)); + + if (_krb5_have_debug(context, 5)) { + char *unparsed; + + ret = krb5_unparse_name(context, in_creds->server, &unparsed); + if (ret) { + _krb5_debug(context, 5, "krb5_get_creds: unable to display " + "requested service principal"); + } else { + _krb5_debug(context, 5, "krb5_get_creds: requesting a ticket " + "for %s", unparsed); + free(unparsed); + } + } + + if (in_creds->session.keytype) { + ret = krb5_enctype_valid(context, in_creds->session.keytype); + if (ret) + return ret; + options |= KRB5_TC_MATCH_KEYTYPE; + } + + *out_creds = NULL; + res_creds = calloc(1, sizeof(*res_creds)); + if (res_creds == NULL) + return krb5_enomem(context); + + ret = krb5_name_canon_iterator_start(context, in_creds->server, + &name_canon_iter); + if (ret) + goto out; + +next_rule: + krb5_free_cred_contents(context, res_creds); + memset(res_creds, 0, sizeof (*res_creds)); + ret = krb5_name_canon_iterate(context, &name_canon_iter, &try_princ, + &rule_opts); + in_creds->server = rk_UNCONST(try_princ); + if (ret) + goto out; + + if (name_canon_iter == NULL) { + if (options & KRB5_GC_CACHED) + ret = KRB5_CC_NOTFOUND; + else + ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN; + goto out; + } + + ret = check_cc(context, options, ccache, in_creds, res_creds); + if (ret == 0) { + *out_creds = res_creds; + res_creds = NULL; + goto out; + } else if(ret != KRB5_CC_END) { + goto out; + } + if (options & KRB5_GC_CACHED) + goto next_rule; + + 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 = _krb5_get_cred_kdc_any(context, flags, ccache, &fast_state, + in_creds, NULL, NULL, out_creds, &tgts); + for (i = 0; tgts && tgts[i]; i++) { + if ((options & KRB5_GC_NO_STORE) == 0) + krb5_cc_store_cred(context, ccache, tgts[i]); + krb5_free_creds(context, tgts[i]); + } + free(tgts); + + /* We don't yet have TGS w/ FAST, so we can't protect KBR-ERRORs */ + if (ret == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN && + !(rule_opts & KRB5_NCRO_USE_FAST)) + goto next_rule; + + if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0) + store_cred(context, ccache, in_creds->server, *out_creds); + + if (ret == 0 && _krb5_have_debug(context, 5)) { + char *unparsed; + + ret = krb5_unparse_name(context, (*out_creds)->server, &unparsed); + if (ret) { + _krb5_debug(context, 5, "krb5_get_creds: unable to display " + "service principal"); + } else { + _krb5_debug(context, 5, "krb5_get_creds: got a ticket for %s", + unparsed); + free(unparsed); + } + } + +out: + in_creds->server = save_princ; + krb5_free_creds(context, res_creds); + krb5_free_name_canon_iterator(context, name_canon_iter); + _krb5_fast_free(context, &fast_state); + if (ret) + return not_found(context, in_creds->server, ret); + return 0; +} + +KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +krb5_get_creds_opt_alloc(krb5_context context, krb5_get_creds_opt *opt) +{ + *opt = calloc(1, sizeof(**opt)); + if (*opt == NULL) + return krb5_enomem(context); + return 0; +} + +KRB5_LIB_FUNCTION void KRB5_LIB_CALL +krb5_get_creds_opt_free(krb5_context context, krb5_get_creds_opt opt) +{ + if (opt->self) + krb5_free_principal(context, opt->self); + if (opt->ticket) { + free_Ticket(opt->ticket); + free(opt->ticket); + } + memset(opt, 0, sizeof(*opt)); + free(opt); +} + +KRB5_LIB_FUNCTION void KRB5_LIB_CALL +krb5_get_creds_opt_set_options(krb5_context context, + krb5_get_creds_opt opt, + krb5_flags options) +{ + opt->options = options; +} + +KRB5_LIB_FUNCTION void KRB5_LIB_CALL +krb5_get_creds_opt_add_options(krb5_context context, + krb5_get_creds_opt opt, + krb5_flags options) +{ + opt->options |= options; +} + +KRB5_LIB_FUNCTION void KRB5_LIB_CALL +krb5_get_creds_opt_set_enctype(krb5_context context, + krb5_get_creds_opt opt, + krb5_enctype enctype) +{ + opt->enctype = enctype; +} + +KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +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_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +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) + return krb5_enomem(context); + ret = copy_Ticket(ticket, opt->ticket); + if (ret) { + free(opt->ticket); + opt->ticket = NULL; + krb5_set_error_message(context, ret, + N_("malloc: out of memory", "")); + return ret; + } + } + return 0; +} + + +KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +krb5_get_creds(krb5_context context, + krb5_get_creds_opt opt, + krb5_ccache ccache, + krb5_const_principal inprinc, + krb5_creds **out_creds) +{ + struct krb5_fast_state fast_state; + krb5_kdc_flags flags; + krb5_flags options; + krb5_creds in_creds; + krb5_error_code ret; + krb5_creds **tgts; + krb5_creds *res_creds; + krb5_const_principal try_princ = NULL; + krb5_name_canon_iterator name_canon_iter = NULL; + krb5_name_canon_rule_options rule_opts; + int i; + int type; + const char *comp; + + memset(&fast_state, 0, sizeof(fast_state)); + memset(&in_creds, 0, sizeof(in_creds)); + in_creds.server = rk_UNCONST(inprinc); + + if (_krb5_have_debug(context, 5)) { + char *unparsed; + + ret = krb5_unparse_name(context, in_creds.server, &unparsed); + if (ret) { + _krb5_debug(context, 5, "krb5_get_creds: unable to display " + "requested service principal"); + } else { + _krb5_debug(context, 5, "krb5_get_creds: requesting a ticket " + "for %s", unparsed); + free(unparsed); + } + } + + if (opt && opt->enctype) { + ret = krb5_enctype_valid(context, opt->enctype); + if (ret) + return ret; + } + + ret = krb5_cc_get_principal(context, ccache, &in_creds.client); + if (ret) + return ret; + + if (opt) + options = opt->options; + else + options = 0; + flags.i = 0; + + *out_creds = NULL; + res_creds = calloc(1, sizeof(*res_creds)); + if (res_creds == NULL) { + krb5_free_principal(context, in_creds.client); + return krb5_enomem(context); + } + + if (opt && opt->enctype) { + in_creds.session.keytype = opt->enctype; + options |= KRB5_TC_MATCH_KEYTYPE; + } + + ret = krb5_name_canon_iterator_start(context, in_creds.server, + &name_canon_iter); + if (ret) + goto out; + +next_rule: + ret = krb5_name_canon_iterate(context, &name_canon_iter, &try_princ, + &rule_opts); + in_creds.server = rk_UNCONST(try_princ); + if (ret) + goto out; + + if (name_canon_iter == NULL) { + if (options & KRB5_GC_CACHED) + ret = KRB5_CC_NOTFOUND; + else + ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN; + goto out; + } + + if ((options & KRB5_GC_CONSTRAINED_DELEGATION) == 0) { + ret = check_cc(context, options, ccache, &in_creds, res_creds); + if (ret == 0) { + *out_creds = res_creds; + res_creds = NULL; + goto out; + } else if (ret != KRB5_CC_END) { + goto out; + } + } + if (options & KRB5_GC_CACHED) + goto next_rule; + + type = krb5_principal_get_type(context, try_princ); + comp = krb5_principal_get_comp_string(context, try_princ, 0); + if ((type == KRB5_NT_SRV_HST || type == KRB5_NT_UNKNOWN) && + comp != NULL && strcmp(comp, "host") == 0) + flags.b.canonicalize = 1; + if (rule_opts & KRB5_NCRO_NO_REFERRALS) + flags.b.canonicalize = 0; + else + flags.b.canonicalize = (options & KRB5_GC_CANONICALIZE) ? 1 : 0; + 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.cname_in_addl_tkt = 1; + if (options & KRB5_GC_ANONYMOUS) + flags.b.request_anonymous = 1; + + tgts = NULL; + ret = _krb5_get_cred_kdc_any(context, flags, ccache, &fast_state, + &in_creds, opt ? opt->self : 0, + opt ? opt->ticket : 0, out_creds, + &tgts); + for (i = 0; tgts && tgts[i]; i++) { + if ((options & KRB5_GC_NO_STORE) == 0) + krb5_cc_store_cred(context, ccache, tgts[i]); + krb5_free_creds(context, tgts[i]); + } + free(tgts); + + /* We don't yet have TGS w/ FAST, so we can't protect KBR-ERRORs */ + if (ret == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN && + !(rule_opts & KRB5_NCRO_USE_FAST)) + goto next_rule; + + if (ret == 0 && (options & KRB5_GC_NO_STORE) == 0) + store_cred(context, ccache, inprinc, *out_creds); + + if (ret == 0 && _krb5_have_debug(context, 5)) { + char *unparsed; + + ret = krb5_unparse_name(context, (*out_creds)->server, &unparsed); + if (ret) { + _krb5_debug(context, 5, "krb5_get_creds: unable to display " + "service principal"); + } else { + _krb5_debug(context, 5, "krb5_get_creds: got a ticket for %s", + unparsed); + free(unparsed); + } + } + +out: + _krb5_fast_free(context, &fast_state); + krb5_free_creds(context, res_creds); + krb5_free_principal(context, in_creds.client); + krb5_free_name_canon_iterator(context, name_canon_iter); + if (ret) + return not_found(context, inprinc, ret); + return ret; +} + +/* + * + */ + +KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL +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; +} |