621ae299f3
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@1383 ec53bebd-3082-4978-b11e-865c3cabbd6b
570 lines
14 KiB
C
570 lines
14 KiB
C
#include "kdc_locl.h"
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RCSID("$Id$");
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struct timeval now;
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#define kdc_time now.tv_sec
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struct db_entry*
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db_fetch(krb5_context context, PrincipalName *principal, char *realm)
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{
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DB *db;
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DBT key, value;
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krb5_data data;
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krb5_storage *sp;
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struct db_entry *ent;
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int32_t tmp;
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int i;
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ent = malloc(sizeof(struct db_entry));
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principalname2krb5_principal(&ent->principal, *principal, realm);
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sp = krb5_storage_emem();
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ent->principal->type = 0;
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krb5_store_principal(sp, ent->principal);
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krb5_storage_to_data(sp, &data);
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krb5_storage_free(sp);
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key.data = data.data;
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key.size = data.length;
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db = dbopen("foo.db", O_RDONLY, 0, DB_BTREE, NULL);
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if(db->get(db, &key, &value, 0)){
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db->close(db);
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return NULL;
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}
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krb5_data_free(&data);
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sp = krb5_storage_from_mem(value.data, value.size);
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krb5_ret_keyblock(sp, &ent->keyblock);
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krb5_ret_int32(sp, &tmp);
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ent->kvno = tmp;
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krb5_ret_int32(sp, &tmp);
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ent->max_life = tmp;
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krb5_ret_int32(sp, &tmp);
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ent->max_renew = tmp;
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krb5_storage_free(sp);
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db->close(db);
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return ent;
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}
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krb5_error_code
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krb5_encrypt (krb5_context context,
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void *ptr,
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size_t len,
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krb5_keyblock *keyblock,
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krb5_data *result);
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krb5_mk_error(krb5_principal princ,
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krb5_error_code error_code,
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krb5_data *err)
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{
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KRB_ERROR msg;
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unsigned char buf[1024];
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memset(&msg, 0, sizeof(msg));
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msg.pvno = 5;
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msg.msg_type = krb_error;
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msg.stime = time(0);
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msg.error_code = error_code;
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msg.realm = princ->realm.data;
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krb5_principal2principalname(&msg.sname, princ);
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err->length = encode_KRB_ERROR(buf + sizeof(buf) - 1, sizeof(buf), &msg);
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err->data = malloc(err->length);
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memcpy(err->data, buf + sizeof(buf) - err->length, err->length);
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return 0;
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}
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krb5_error_code
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mk_des_keyblock(EncryptionKey *kb)
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{
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kb->keytype = KEYTYPE_DES;
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kb->keyvalue.data = malloc(sizeof(des_cblock));
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kb->keyvalue.length = sizeof(des_cblock);
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des_rand_data_key(kb->keyvalue.data);
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return 0;
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}
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krb5_error_code
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as_rep(krb5_context context,
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KDC_REQ *req,
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KDC_REP *rep,
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krb5_data *data)
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{
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KDCOptions f = req->req_body.kdc_options;
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KDC_REQ_BODY *b = &req->req_body;
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struct db_entry *client, *server;
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int use_etype;
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EncTicketPart *et = calloc(1, sizeof(*et));
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EncKDCRepPart *ek = calloc(1, sizeof(*ek));
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client = db_fetch(context, b->cname, b->realm);
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server = db_fetch(context, b->sname, b->realm);
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if(client == NULL)
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return KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
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if(server == NULL)
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return KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
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/* XXX Check for pa_enc_timestamp */
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if(b->etype.len == 0)
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return KRB5KDC_ERR_ETYPE_NOSUPP; /* XXX */
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use_etype = b->etype.val[0];
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memset(rep, 0, sizeof(*rep));
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rep->pvno = 5;
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rep->msg_type = krb_as_rep;
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rep->crealm = b->realm;
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rep->cname = *b->cname;
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rep->ticket.tkt_vno = 5;
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rep->ticket.sname = *b->sname;
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rep->ticket.realm = b->realm;
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if(f.renew || f.validate || f.proxy || f.forwarded || f.enc_tkt_in_skey)
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return KRB5KDC_ERR_BADOPTION;
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et->flags.initial = 1;
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et->flags.forwardable = f.forwardable;
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et->flags.proxiable = f.proxiable;
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et->flags.may_postdate = f.allow_postdate;
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mk_des_keyblock(&et->key);
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et->cname = *b->cname;
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et->crealm = b->realm;
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{
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time_t start;
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time_t t;
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start = et->authtime = kdc_time;
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if(f.postdated && req->req_body.from){
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et->starttime = malloc(sizeof(*et->starttime));
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start = *et->starttime = *req->req_body.from;
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et->flags.invalid = 1;
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et->flags.postdated = 1; /* XXX ??? */
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}
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t = b->till;
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if(b->till == 0)
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t = start + client->max_life;
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t = MIN(t, start + client->max_life);
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t = MIN(t, start + server->max_life);
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#if 0
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t = MIN(t, start + realm->max_life);
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#endif
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et->endtime = t;
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if(f.renewable_ok && et->endtime < b->till){
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f.renewable = 1;
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if(b->rtime == NULL){
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b->rtime = malloc(sizeof(*b->rtime));
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*b->rtime = 0;
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}
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if(*b->rtime < b->till)
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*b->rtime = b->till;
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}
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if(f.renewable && b->rtime){
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t = *b->rtime;
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if(t == 0)
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t = start + client->max_renew;
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t = MIN(t, start + client->max_renew);
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t = MIN(t, start + server->max_renew);
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#if 0
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t = MIN(t, start + realm->max_renew);
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#endif
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et->renew_till = malloc(sizeof(*et->renew_till));
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*et->renew_till = t;
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}
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}
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et->caddr = b->addresses;
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memset(ek, 0, sizeof(*ek));
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ek->key = et->key;
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/* MIT must have at least one last_req */
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ek->last_req.len = 1;
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ek->last_req.val = malloc(sizeof(*ek->last_req.val));
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ek->last_req.val->lr_type = 0;
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ek->last_req.val->lr_value = 0;
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ek->nonce = b->nonce;
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ek->flags = et->flags;
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ek->authtime = et->authtime;
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ek->starttime = et->starttime;
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ek->endtime = et->endtime;
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ek->renew_till = et->renew_till;
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ek->srealm = rep->ticket.realm;
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ek->sname = rep->ticket.sname;
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ek->caddr = et->caddr;
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{
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unsigned char buf[1024]; /* XXX The data could be indefinite */
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int len;
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len = encode_EncTicketPart(buf + sizeof(buf) - 1, sizeof(buf), et);
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if(len < 0)
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return ASN1_OVERFLOW;
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rep->ticket.enc_part.etype = ETYPE_DES_CBC_CRC;
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rep->ticket.enc_part.kvno = NULL;
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krb5_encrypt(context, buf + sizeof(buf) - len, len, &server->keyblock,
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&rep->ticket.enc_part.cipher);
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len = encode_EncASRepPart(buf + sizeof(buf) - 1, sizeof(buf), ek);
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if(len < 0)
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return ASN1_OVERFLOW;
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rep->enc_part.etype = ETYPE_DES_CBC_CRC;
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rep->enc_part.kvno = NULL;
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krb5_encrypt(context, buf + sizeof(buf) - len, len, &client->keyblock,
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&rep->enc_part.cipher);
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len = encode_AS_REP(buf + sizeof(buf) - 1, sizeof(buf), rep);
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if(len < 0)
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return ASN1_OVERFLOW;
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krb5_data_copy(data, buf + sizeof(buf) - len, len);
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}
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return 0;
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}
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krb5_error_code
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tgs_rep(krb5_context context,
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KDC_REQ *req,
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KDC_REP *rep,
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krb5_data *data)
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{
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KDC_REQ_BODY *b = &req->req_body;
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KDCOptions f = req->req_body.kdc_options;
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EncTicketPart *tgt;
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struct db_entry *server, *krbtgt, *client;
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EncTicketPart *et = calloc(1, sizeof(*et));
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EncKDCRepPart *ek = calloc(1, sizeof(*ek));
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if(req->padata == NULL || req->padata->len < 1)
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return KRB5KDC_ERR_PREAUTH_REQUIRED; /* XXX ??? */
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if(req->padata->val->padata_type != pa_tgs_req)
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return KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
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{
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krb5_auth_context ac = NULL;
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krb5_principal princ;
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krb5_flags ap_req_options;
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krb5_ticket *ticket;
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krb5_error_code err;
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struct db_entry *ent;
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err = krb5_build_principal(context,
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&princ,
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strlen(req->req_body.realm),
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req->req_body.realm,
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"krbtgt",
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req->req_body.realm,
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NULL);
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if(err) return err;
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{
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PrincipalName p;
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p.name_string.val = calloc(2, sizeof(*p.name_string.val));
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p.name_string.len = 2;
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p.name_string.val[0] = "krbtgt";
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p.name_string.val[1] = req->req_body.realm;
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krbtgt = db_fetch(context, &p, req->req_body.realm);
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free(p.name_string.val);
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}
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if(ent == NULL)
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return KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
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err = krb5_rd_req_with_keyblock(context, &ac,
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&req->padata->val->padata_value,
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princ,
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&krbtgt->keyblock,
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&ap_req_options,
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&ticket);
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if(err)
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return err;
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/* XXX Check authenticator */
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server = db_fetch(context, b->sname, b->realm);
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if(server == NULL)
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return KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
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tgt = &ticket->tkt;
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client = db_fetch(context, &tgt->cname, tgt->crealm);
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if(client == NULL)
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return KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
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memset(rep, 0, sizeof(*rep));
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rep->pvno = 5;
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rep->msg_type = krb_tgs_rep;
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rep->crealm = tgt->crealm;
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rep->cname = tgt->cname;
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rep->ticket.tkt_vno = 5;
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rep->ticket.sname = *b->sname;
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rep->ticket.realm = b->realm;
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et->caddr = ticket->tkt.caddr;
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if(f.forwardable){
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if(!tgt->flags.forwardable)
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return KRB5KDC_ERR_BADOPTION;
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et->flags.forwardable = 1;
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}
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if(f.forwarded){
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if(!tgt->flags.forwardable)
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return KRB5KDC_ERR_BADOPTION;
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et->flags.forwarded = 1;
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et->caddr = req->req_body.addresses;
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/* resp.caddr := req.addresses */
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}
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et->flags.forwarded = tgt->flags.forwarded;
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if(f.proxiable){
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if(!tgt->flags.proxiable)
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return KRB5KDC_ERR_BADOPTION;
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et->flags.proxiable = 1;
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}
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if(f.proxy){
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if(!tgt->flags.proxiable)
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return KRB5KDC_ERR_BADOPTION;
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et->flags.proxy = 1;
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et->caddr = req->req_body.addresses;
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/* resp.caddr := req.addresses */
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}
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if(f.allow_postdate){
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if(!tgt->flags.may_postdate)
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return KRB5KDC_ERR_BADOPTION;
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et->flags.may_postdate = 1;
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}
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if(f.postdated){
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if(!tgt->flags.may_postdate)
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return KRB5KDC_ERR_BADOPTION;
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et->flags.postdated = 1;
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et->flags.invalid = 1;
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et->starttime = malloc(sizeof(*et->starttime));
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*et->starttime = *req->req_body.from;
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}
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if(f.validate){
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if(!tgt->flags.invalid)
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return KRB5KDC_ERR_BADOPTION;
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if(*tgt->starttime > kdc_time)
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return KRB5KRB_AP_ERR_TKT_NYV;
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/* XXX tkt = tgt */
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et->flags.invalid = 0;
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}
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/* check for excess flags */
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et->authtime = tgt->authtime;
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if(f.renew){
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time_t old_life;
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if(!tgt->flags.renewable)
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return KRB5KDC_ERR_BADOPTION;
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if(*tgt->renew_till >= kdc_time)
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return KRB5KRB_AP_ERR_TKT_EXPIRED;
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/* XXX tkt = tgt */
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et->starttime = malloc(sizeof(*et->starttime));
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*et->starttime = kdc_time;
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old_life = tgt->endtime - *tgt->starttime;
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et->endtime = MIN(*tgt->renew_till,
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*et->starttime + old_life);
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}else{
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time_t till;
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et->starttime = malloc(sizeof(*et->starttime));
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*et->starttime = kdc_time;
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till = b->till;
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if(till == 0)
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till = *et->starttime + client->max_life;
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till = MIN(till, *et->starttime + client->max_life);
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till = MIN(till, *et->starttime + server->max_life);
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till = MIN(till, tgt->endtime);
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#if 0
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till = MIN(till, et->starttime + realm->max_life);
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#endif
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et->endtime = till;
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if(f.renewable_ok &&
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et->endtime < b->till &&
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tgt->flags.renewable){
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f.renewable = 1;
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b->rtime = malloc(sizeof(*b->rtime));
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*b->rtime = MIN(b->till, *tgt->renew_till);
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}
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}
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if(f.renewable && tgt->flags.renewable && b->rtime){
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time_t rtime;
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rtime = *b->rtime;
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if(rtime == 0)
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rtime = *et->starttime + client->max_renew;
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et->flags.renewable = 1;
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rtime = MIN(rtime, *et->starttime + client->max_renew);
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rtime = MIN(rtime, *et->starttime + server->max_renew);
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rtime = MIN(rtime, *tgt->renew_till);
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#if 0
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rtime = MIN(rtime, *et->starttime + realm->max_renew);
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#endif
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et->renew_till = malloc(sizeof(*et->renew_till));
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*et->renew_till = rtime;
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}
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/* XXX Check enc-authorization-data */
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mk_des_keyblock(&et->key);
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et->crealm = tgt->crealm;
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et->cname = tgt->cname;
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et->transited = tgt->transited;
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memset(ek, 0, sizeof(*ek));
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ek->key = et->key;
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/* MIT must have at least one last_req */
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ek->last_req.len = 1;
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ek->last_req.val = malloc(sizeof(*ek->last_req.val));
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ek->last_req.val->lr_type = 0;
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ek->last_req.val->lr_value = 0;
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ek->nonce = b->nonce;
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ek->flags = et->flags;
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ek->authtime = et->authtime;
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ek->starttime = et->starttime;
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ek->endtime = et->endtime;
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ek->renew_till = et->renew_till;
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ek->srealm = rep->ticket.realm;
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ek->sname = rep->ticket.sname;
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ek->caddr = et->caddr;
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{
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unsigned char buf[1024]; /* XXX The data could be indefinite */
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int len;
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len = encode_EncTicketPart(buf + sizeof(buf) - 1, sizeof(buf), et);
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if(len < 0)
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return ASN1_OVERFLOW;
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rep->ticket.enc_part.etype = ETYPE_DES_CBC_CRC;
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rep->ticket.enc_part.kvno = NULL;
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krb5_encrypt(context, buf + sizeof(buf) - len, len, &server->keyblock,
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&rep->ticket.enc_part.cipher);
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len = encode_EncTGSRepPart(buf + sizeof(buf) - 1, sizeof(buf), ek);
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if(len < 0)
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return ASN1_OVERFLOW;
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rep->enc_part.etype = ETYPE_DES_CBC_CRC;
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rep->enc_part.kvno = NULL;
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{
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krb5_keyblock kb;
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kb.keytype = tgt->key.keytype;
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kb.contents = tgt->key.keyvalue;
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krb5_encrypt(context, buf + sizeof(buf) - len, len, &kb,
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&rep->enc_part.cipher);
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}
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len = encode_TGS_REP(buf + sizeof(buf) - 1, sizeof(buf), rep);
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if(len < 0)
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return ASN1_OVERFLOW;
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krb5_data_copy(data, buf + sizeof(buf) - len, len);
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}
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return 0;
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}
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}
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krb5_error_code
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process_request(krb5_context context,
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KDC_REQ *req,
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krb5_data *reply)
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{
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krb5_error_code err;
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krb5_principal princ;
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unsigned char key_buf[1024];
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unsigned char *q;
|
|
DB *db;
|
|
DBT key, value;
|
|
|
|
|
|
KDC_REP rep;
|
|
|
|
|
|
struct db_entry *cname, *sname;
|
|
|
|
gettimeofday(&now, NULL);
|
|
|
|
if(req->msg_type == krb_as_req)
|
|
as_rep(context, req, &rep, reply);
|
|
else if(req->msg_type == krb_tgs_req)
|
|
tgs_rep(context, req, &rep, reply);
|
|
else
|
|
/* XXX */
|
|
return KRB5KRB_AP_ERR_MSG_TYPE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
kerberos(krb5_context context,
|
|
unsigned char *buf,
|
|
size_t len,
|
|
krb5_data *reply)
|
|
{
|
|
KDC_REQ req;
|
|
int i;
|
|
i = decode_AS_REQ(buf, len, &req);
|
|
if(i >= 0){
|
|
return process_request(context, &req, reply);
|
|
}
|
|
i = decode_TGS_REQ(buf, len, &req);
|
|
if(i >= 0){
|
|
return process_request(context, &req, reply);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
main(int argc, char **argv)
|
|
{
|
|
krb5_context context;
|
|
int s = socket(AF_INET, SOCK_DGRAM, 0);
|
|
struct sockaddr_in sin;
|
|
int one = 1;
|
|
if(s < 0){
|
|
perror("socket");
|
|
exit(1);
|
|
}
|
|
krb5_init_context(&context);
|
|
memset(&sin, 0, sizeof(sin));
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_port = htons(88);
|
|
if(bind(s, (struct sockaddr*)&sin, sizeof(sin)) < 0){
|
|
perror("bind");
|
|
exit(1);
|
|
}
|
|
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
|
|
while(1){
|
|
fd_set fds;
|
|
unsigned char buf[1024];
|
|
size_t len;
|
|
FD_ZERO(&fds);
|
|
FD_SET(s, &fds);
|
|
if(select(s + 1, &fds, NULL, NULL, NULL) < 0){
|
|
perror("select");
|
|
exit(1);
|
|
}
|
|
if(FD_ISSET(s, &fds)){
|
|
struct sockaddr_in from;
|
|
int from_len = sizeof(from);
|
|
krb5_error_code err;
|
|
krb5_data reply;
|
|
len = recvfrom(s, buf, sizeof(buf), 0,
|
|
(struct sockaddr*)&from, &from_len);
|
|
err = kerberos(context, buf, len, &reply);
|
|
if(err){
|
|
fprintf(stderr, "%s\n", krb5_get_err_text(context, err));
|
|
}else{
|
|
sendto(s, reply.data, reply.length, 0,
|
|
(struct sockaddr*)&from, from_len);
|
|
krb5_data_free(&reply);
|
|
}
|
|
}
|
|
}
|
|
}
|