diff options
Diffstat (limited to 'crypto/heimdal/lib/krb5/get_in_tkt.c')
| -rw-r--r-- | crypto/heimdal/lib/krb5/get_in_tkt.c | 794 |
1 files changed, 794 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/krb5/get_in_tkt.c b/crypto/heimdal/lib/krb5/get_in_tkt.c new file mode 100644 index 000000000000..f65af470ba12 --- /dev/null +++ b/crypto/heimdal/lib/krb5/get_in_tkt.c @@ -0,0 +1,794 @@ +/* + * Copyright (c) 1997, 1998, 1999 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: get_in_tkt.c,v 1.93 2000/01/06 20:36:28 assar Exp $"); + +krb5_error_code +krb5_init_etype (krb5_context context, + unsigned *len, + int **val, + const krb5_enctype *etypes) +{ + int i; + krb5_error_code ret; + krb5_enctype *tmp; + + ret = 0; + if (etypes) + tmp = (krb5_enctype*)etypes; + else { + ret = krb5_get_default_in_tkt_etypes(context, + &tmp); + if (ret) + return ret; + } + + for (i = 0; tmp[i]; ++i) + ; + *len = i; + *val = malloc(i * sizeof(int)); + if (i != 0 && *val == NULL) { + ret = ENOMEM; + goto cleanup; + } + memmove (*val, + tmp, + i * sizeof(*tmp)); +cleanup: + if (etypes == NULL) + free (tmp); + return ret; +} + + +static krb5_error_code +decrypt_tkt (krb5_context context, + krb5_keyblock *key, + krb5_key_usage usage, + krb5_const_pointer decrypt_arg, + krb5_kdc_rep *dec_rep) +{ + krb5_error_code ret; + krb5_data data; + size_t size; + krb5_crypto crypto; + + krb5_crypto_init(context, key, 0, &crypto); + + ret = krb5_decrypt_EncryptedData (context, + crypto, + usage, + &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); + if (ret) + return ret; + return 0; +} + +int +_krb5_extract_ticket(krb5_context context, + krb5_kdc_rep *rep, + krb5_creds *creds, + krb5_keyblock *key, + krb5_const_pointer keyseed, + krb5_key_usage key_usage, + krb5_addresses *addrs, + unsigned nonce, + krb5_boolean allow_server_mismatch, + krb5_decrypt_proc decrypt_proc, + krb5_const_pointer decryptarg) +{ + krb5_error_code ret; + krb5_principal tmp_principal; + int tmp; + time_t tmp_time; + int32_t sec_now; + + /* compare client */ + + ret = principalname2krb5_principal (&tmp_principal, + rep->kdc_rep.cname, + rep->kdc_rep.crealm); + if (ret) + goto out; + tmp = krb5_principal_compare (context, tmp_principal, creds->client); + krb5_free_principal (context, tmp_principal); + if (!tmp) { + ret = KRB5KRB_AP_ERR_MODIFIED; + goto out; + } + + /* extract ticket */ + { + unsigned char *buf; + size_t len; + len = length_Ticket(&rep->kdc_rep.ticket); + buf = malloc(len); + if(buf == NULL) { + ret = ENOMEM; + goto out; + } + encode_Ticket(buf + len - 1, len, &rep->kdc_rep.ticket, &len); + creds->ticket.data = buf; + creds->ticket.length = len; + creds->second_ticket.length = 0; + creds->second_ticket.data = NULL; + } + + /* compare server */ + + ret = principalname2krb5_principal (&tmp_principal, + rep->kdc_rep.ticket.sname, + rep->kdc_rep.ticket.realm); + if (ret) + goto out; + if(allow_server_mismatch){ + krb5_free_principal(context, creds->server); + creds->server = tmp_principal; + tmp_principal = NULL; + }else{ + tmp = krb5_principal_compare (context, tmp_principal, creds->server); + krb5_free_principal (context, tmp_principal); + if (!tmp) { + ret = KRB5KRB_AP_ERR_MODIFIED; + goto out; + } + } + + /* decrypt */ + + if (decrypt_proc == NULL) + decrypt_proc = decrypt_tkt; + + ret = (*decrypt_proc)(context, key, key_usage, decryptarg, rep); + if (ret) + goto out; + +#if 0 + /* XXX should this decode be here, or in the decrypt_proc? */ + ret = krb5_decode_keyblock(context, &rep->enc_part.key, 1); + if(ret) + goto out; +#endif + + /* compare nonces */ + + if (nonce != rep->enc_part.nonce) { + ret = KRB5KRB_AP_ERR_MODIFIED; + goto out; + } + + /* set kdc-offset */ + + krb5_timeofday (context, &sec_now); + if (context->kdc_sec_offset == 0 + && krb5_config_get_bool (context, NULL, + "libdefaults", + "kdc_timesync", + NULL)) { + context->kdc_sec_offset = rep->enc_part.authtime - sec_now; + krb5_timeofday (context, &sec_now); + } + + /* check all times */ + + if (rep->enc_part.starttime) { + tmp_time = *rep->enc_part.starttime; + } else + tmp_time = rep->enc_part.authtime; + + if (creds->times.starttime == 0 + && abs(tmp_time - sec_now) > context->max_skew) { + ret = KRB5KRB_AP_ERR_SKEW; + goto out; + } + + if (creds->times.starttime != 0 + && tmp_time != creds->times.starttime) { + ret = KRB5KRB_AP_ERR_MODIFIED; + goto out; + } + + creds->times.starttime = tmp_time; + + if (rep->enc_part.renew_till) { + tmp_time = *rep->enc_part.renew_till; + } else + tmp_time = 0; + + if (creds->times.renew_till != 0 + && tmp_time > creds->times.renew_till) { + ret = KRB5KRB_AP_ERR_MODIFIED; + goto out; + } + + creds->times.renew_till = tmp_time; + + creds->times.authtime = rep->enc_part.authtime; + + if (creds->times.endtime != 0 + && rep->enc_part.endtime > creds->times.endtime) { + ret = KRB5KRB_AP_ERR_MODIFIED; + goto out; + } + + creds->times.endtime = rep->enc_part.endtime; + + if(rep->enc_part.caddr) + krb5_copy_addresses (context, rep->enc_part.caddr, &creds->addresses); + else if(addrs) + krb5_copy_addresses (context, addrs, &creds->addresses); + else { + creds->addresses.len = 0; + creds->addresses.val = NULL; + } + creds->flags.b = rep->enc_part.flags; + + creds->authdata.len = 0; + creds->authdata.val = NULL; + creds->session.keyvalue.length = 0; + creds->session.keyvalue.data = NULL; + creds->session.keytype = rep->enc_part.key.keytype; + ret = krb5_data_copy (&creds->session.keyvalue, + rep->enc_part.key.keyvalue.data, + rep->enc_part.key.keyvalue.length); + +out: + memset (rep->enc_part.key.keyvalue.data, 0, + rep->enc_part.key.keyvalue.length); + return ret; +} + + +static krb5_error_code +make_pa_enc_timestamp(krb5_context context, PA_DATA *pa, + krb5_enctype etype, krb5_keyblock *key) +{ + PA_ENC_TS_ENC p; + u_char buf[1024]; + size_t len; + EncryptedData encdata; + krb5_error_code ret; + int32_t sec, usec; + int usec2; + krb5_crypto crypto; + + krb5_us_timeofday (context, &sec, &usec); + p.patimestamp = sec; + usec2 = usec; + p.pausec = &usec2; + + ret = encode_PA_ENC_TS_ENC(buf + sizeof(buf) - 1, + sizeof(buf), + &p, + &len); + if (ret) + return ret; + + krb5_crypto_init(context, key, 0, &crypto); + ret = krb5_encrypt_EncryptedData(context, + crypto, + KRB5_KU_PA_ENC_TIMESTAMP, + buf + sizeof(buf) - len, + len, + 0, + &encdata); + krb5_crypto_destroy(context, crypto); + if (ret) + return ret; + + ret = encode_EncryptedData(buf + sizeof(buf) - 1, + sizeof(buf), + &encdata, + &len); + free_EncryptedData(&encdata); + if (ret) + return ret; + pa->padata_type = pa_enc_timestamp; + pa->padata_value.length = 0; + krb5_data_copy(&pa->padata_value, + buf + sizeof(buf) - len, + len); + return 0; +} + +static krb5_error_code +add_padata(krb5_context context, + METHOD_DATA *md, + krb5_principal client, + krb5_key_proc key_proc, + krb5_const_pointer keyseed, + int *enctypes, + unsigned netypes, + krb5_salt *salt) +{ + krb5_error_code ret; + PA_DATA *pa2; + krb5_salt salt2; + int *ep; + int i; + + if(salt == NULL) { + /* default to standard salt */ + ret = krb5_get_pw_salt (context, client, &salt2); + salt = &salt2; + } + if (!enctypes) { + enctypes = (int *)context->etypes; /* XXX */ + netypes = 0; + for (ep = enctypes; *ep != ETYPE_NULL; ep++) + netypes++; + } + pa2 = realloc (md->val, (md->len + netypes) * sizeof(*md->val)); + if (pa2 == NULL) + return ENOMEM; + md->val = pa2; + + for (i = 0; i < netypes; ++i) { + krb5_keyblock *key; + + ret = (*key_proc)(context, enctypes[i], *salt, keyseed, &key); + if (ret) + continue; + ret = make_pa_enc_timestamp (context, &md->val[md->len], + enctypes[i], key); + krb5_free_keyblock (context, key); + if (ret) + return ret; + ++md->len; + } + if(salt == &salt2) + krb5_free_salt(context, salt2); + return 0; +} + +static krb5_error_code +init_as_req (krb5_context context, + krb5_kdc_flags opts, + krb5_creds *creds, + const krb5_addresses *addrs, + const krb5_enctype *etypes, + const krb5_preauthtype *ptypes, + const krb5_preauthdata *preauth, + krb5_key_proc key_proc, + krb5_const_pointer keyseed, + unsigned nonce, + AS_REQ *a) +{ + krb5_error_code ret; + krb5_salt salt; + + memset(a, 0, sizeof(*a)); + + a->pvno = 5; + a->msg_type = krb_as_req; + a->req_body.kdc_options = opts.b; + a->req_body.cname = malloc(sizeof(*a->req_body.cname)); + if (a->req_body.cname == NULL) { + ret = ENOMEM; + goto fail; + } + a->req_body.sname = malloc(sizeof(*a->req_body.sname)); + if (a->req_body.sname == NULL) { + ret = ENOMEM; + goto fail; + } + ret = krb5_principal2principalname (a->req_body.cname, creds->client); + if (ret) + goto fail; + ret = krb5_principal2principalname (a->req_body.sname, creds->server); + if (ret) + goto fail; + ret = copy_Realm(&creds->client->realm, &a->req_body.realm); + if (ret) + goto fail; + + if(creds->times.starttime) { + a->req_body.from = malloc(sizeof(*a->req_body.from)); + if (a->req_body.from == NULL) { + ret = ENOMEM; + goto fail; + } + *a->req_body.from = creds->times.starttime; + } + if(creds->times.endtime){ + ALLOC(a->req_body.till, 1); + *a->req_body.till = creds->times.endtime; + } + if(creds->times.renew_till){ + a->req_body.rtime = malloc(sizeof(*a->req_body.rtime)); + if (a->req_body.rtime == NULL) { + ret = ENOMEM; + goto fail; + } + *a->req_body.rtime = creds->times.renew_till; + } + a->req_body.nonce = nonce; + ret = krb5_init_etype (context, + &a->req_body.etype.len, + &a->req_body.etype.val, + etypes); + if (ret) + goto fail; + + /* + * This means no addresses + */ + + if (addrs && addrs->len == 0) { + a->req_body.addresses = NULL; + } else { + a->req_body.addresses = malloc(sizeof(*a->req_body.addresses)); + if (a->req_body.addresses == NULL) { + ret = ENOMEM; + goto fail; + } + + if (addrs) + ret = krb5_copy_addresses(context, addrs, a->req_body.addresses); + else + ret = krb5_get_all_client_addrs (context, a->req_body.addresses); + if (ret) + return ret; + } + + a->req_body.enc_authorization_data = NULL; + a->req_body.additional_tickets = NULL; + + if(preauth != NULL) { + int i; + ALLOC(a->padata, 1); + if(a->padata == NULL) { + ret = ENOMEM; + goto fail; + } + for(i = 0; i < preauth->len; i++) { + if(preauth->val[i].type == KRB5_PADATA_ENC_TIMESTAMP){ + int j; + PA_DATA *tmp = realloc(a->padata->val, + (a->padata->len + + preauth->val[i].info.len) * + sizeof(*a->padata->val)); + if(tmp == NULL) { + ret = ENOMEM; + goto fail; + } + a->padata->val = tmp; + for(j = 0; j < preauth->val[i].info.len; j++) { + krb5_salt *sp = &salt; + if(preauth->val[i].info.val[j].salttype) + salt.salttype = *preauth->val[i].info.val[j].salttype; + else + salt.salttype = KRB5_PW_SALT; + if(preauth->val[i].info.val[j].salt) + salt.saltvalue = *preauth->val[i].info.val[j].salt; + else + if(salt.salttype == KRB5_PW_SALT) + sp = NULL; + else + krb5_data_zero(&salt.saltvalue); + add_padata(context, a->padata, creds->client, + key_proc, keyseed, + &preauth->val[i].info.val[j].etype, 1, + sp); + } + } + } + } else + /* not sure this is the way to use `ptypes' */ + if (ptypes == NULL || *ptypes == KRB5_PADATA_NONE) + a->padata = NULL; + else if (*ptypes == KRB5_PADATA_ENC_TIMESTAMP) { + ALLOC(a->padata, 1); + if (a->padata == NULL) { + ret = ENOMEM; + goto fail; + } + a->padata->len = 0; + a->padata->val = NULL; + + /* make a v5 salted pa-data */ + add_padata(context, a->padata, creds->client, + key_proc, keyseed, a->req_body.etype.val, + a->req_body.etype.len, NULL); + + /* make a v4 salted pa-data */ + salt.salttype = KRB5_PW_SALT; + krb5_data_zero(&salt.saltvalue); + add_padata(context, a->padata, creds->client, + key_proc, keyseed, a->req_body.etype.val, + a->req_body.etype.len, &salt); + } else { + ret = KRB5_PREAUTH_BAD_TYPE; + goto fail; + } + return 0; +fail: + free_AS_REQ(a); + return ret; +} + +static int +set_ptypes(krb5_context context, + KRB_ERROR *error, + krb5_preauthtype **ptypes, + krb5_preauthdata **preauth) +{ + static krb5_preauthdata preauth2; + static krb5_preauthtype ptypes2[] = { KRB5_PADATA_ENC_TIMESTAMP, KRB5_PADATA_NONE }; + + if(error->e_data) { + METHOD_DATA md; + int i; + decode_METHOD_DATA(error->e_data->data, + error->e_data->length, + &md, + NULL); + for(i = 0; i < md.len; i++){ + switch(md.val[i].padata_type){ + case pa_enc_timestamp: + *ptypes = ptypes2; + break; + case pa_etype_info: + *preauth = &preauth2; + ALLOC_SEQ(*preauth, 1); + (*preauth)->val[0].type = KRB5_PADATA_ENC_TIMESTAMP; + krb5_decode_ETYPE_INFO(context, + md.val[i].padata_value.data, + md.val[i].padata_value.length, + &(*preauth)->val[0].info, + NULL); + break; + } + } + free_METHOD_DATA(&md); + } else { + *ptypes = ptypes2; + } + return(1); +} + +krb5_error_code +krb5_get_in_cred(krb5_context context, + krb5_flags options, + const krb5_addresses *addrs, + const krb5_enctype *etypes, + const krb5_preauthtype *ptypes, + const krb5_preauthdata *preauth, + krb5_key_proc key_proc, + krb5_const_pointer keyseed, + krb5_decrypt_proc decrypt_proc, + krb5_const_pointer decryptarg, + krb5_creds *creds, + krb5_kdc_rep *ret_as_reply) +{ + krb5_error_code ret; + AS_REQ a; + krb5_kdc_rep rep; + krb5_data req, resp; + char buf[BUFSIZ]; + krb5_salt salt; + krb5_keyblock *key; + size_t size; + krb5_kdc_flags opts; + PA_DATA *pa; + krb5_enctype etype; + krb5_preauthdata *my_preauth = NULL; + unsigned nonce; + int done; + + opts.i = options; + + krb5_generate_random_block (&nonce, sizeof(nonce)); + nonce &= 0xffffffff; + + do { + done = 1; + ret = init_as_req (context, + opts, + creds, + addrs, + etypes, + ptypes, + preauth, + key_proc, + keyseed, + nonce, + &a); + if (my_preauth) { + free_ETYPE_INFO(&my_preauth->val[0].info); + free (my_preauth->val); + } + if (ret) + return ret; + + ret = encode_AS_REQ ((unsigned char*)buf + sizeof(buf) - 1, + sizeof(buf), + &a, + &req.length); + free_AS_REQ(&a); + if (ret) + return ret; + + req.data = buf + sizeof(buf) - req.length; + + ret = krb5_sendto_kdc (context, &req, &creds->client->realm, &resp); + if (ret) + return ret; + + memset (&rep, 0, sizeof(rep)); + ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size); + if(ret) { + /* let's try to parse it as a KRB-ERROR */ + KRB_ERROR error; + int ret2; + + ret2 = krb5_rd_error(context, &resp, &error); + if(ret2 && resp.data && ((char*)resp.data)[0] == 4) + ret = KRB5KRB_AP_ERR_V4_REPLY; + krb5_data_free(&resp); + if (ret2 == 0) { + ret = error.error_code; + /* if no preauth was set and KDC requires it, give it + one more try */ + if (!ptypes && !preauth + && ret == KRB5KDC_ERR_PREAUTH_REQUIRED +#if 0 + || ret == KRB5KDC_ERR_BADOPTION +#endif + && set_ptypes(context, &error, &ptypes, &my_preauth)) { + done = 0; + preauth = my_preauth; + free_KRB_ERROR(&error); + continue; + } + if(ret_as_reply) + ret_as_reply->error = error; + else + free_KRB_ERROR (&error); + return ret; + } + return ret; + } + krb5_data_free(&resp); + } while(!done); + + pa = NULL; + etype = rep.kdc_rep.enc_part.etype; + if(rep.kdc_rep.padata){ + int index = 0; + pa = krb5_find_padata(rep.kdc_rep.padata->val, rep.kdc_rep.padata->len, + pa_pw_salt, &index); + if(pa == NULL) { + index = 0; + pa = krb5_find_padata(rep.kdc_rep.padata->val, + rep.kdc_rep.padata->len, + pa_afs3_salt, &index); + } + } + if(pa) { + salt.salttype = pa->padata_type; + salt.saltvalue = pa->padata_value; + + ret = (*key_proc)(context, etype, salt, keyseed, &key); + } else { + /* make a v5 salted pa-data */ + ret = krb5_get_pw_salt (context, creds->client, &salt); + + if (ret) + goto out; + ret = (*key_proc)(context, etype, salt, keyseed, &key); + krb5_free_salt(context, salt); + } + if (ret) + goto out; + + ret = _krb5_extract_ticket(context, + &rep, + creds, + key, + keyseed, + KRB5_KU_AS_REP_ENC_PART, + NULL, + nonce, + FALSE, + decrypt_proc, + decryptarg); + memset (key->keyvalue.data, 0, key->keyvalue.length); + krb5_free_keyblock_contents (context, key); + free (key); + +out: + if (ret == 0 && ret_as_reply) + *ret_as_reply = rep; + else + krb5_free_kdc_rep (context, &rep); + return ret; +} + +krb5_error_code +krb5_get_in_tkt(krb5_context context, + krb5_flags options, + const krb5_addresses *addrs, + const krb5_enctype *etypes, + const krb5_preauthtype *ptypes, + krb5_key_proc key_proc, + krb5_const_pointer keyseed, + krb5_decrypt_proc decrypt_proc, + krb5_const_pointer decryptarg, + krb5_creds *creds, + krb5_ccache ccache, + krb5_kdc_rep *ret_as_reply) +{ + krb5_error_code ret; + krb5_kdc_flags opts; + opts.i = 0; + opts.b = int2KDCOptions(options); + + ret = krb5_get_in_cred (context, + opts.i, + addrs, + etypes, + ptypes, + NULL, + key_proc, + keyseed, + decrypt_proc, + decryptarg, + creds, + ret_as_reply); + if(ret) + return ret; + ret = krb5_cc_store_cred (context, ccache, creds); + krb5_free_creds_contents (context, creds); + return ret; +} |