2 ** set password functions added by Paul W. Nelson, Thursby Software Systems, Inc.
11 krb5int_mk_chpw_req(krb5_context context,
12 krb5_auth_context auth_context,
17 krb5_error_code ret = 0;
20 krb5_replay_data replay;
25 if ((ret = krb5_auth_con_setflags(context, auth_context,
26 KRB5_AUTH_CONTEXT_DO_SEQUENCE)))
29 clearpw.length = strlen(passwd);
30 clearpw.data = passwd;
32 if ((ret = krb5_mk_priv(context, auth_context,
33 &clearpw, &cipherpw, &replay)))
36 packet->length = 6 + ap_req->length + cipherpw.length;
37 packet->data = (char *) malloc(packet->length);
38 if (packet->data == NULL) {
46 store_16_be(packet->length, ptr);
49 /* version == 0x0001 big-endian */
54 /* ap_req length, big-endian */
56 store_16_be(ap_req->length, ptr);
61 memcpy(ptr, ap_req->data, ap_req->length);
62 ptr += ap_req->length;
64 /* krb-priv of password */
66 memcpy(ptr, cipherpw.data, cipherpw.length);
69 if (cipherpw.data != NULL) /* allocated by krb5_mk_priv */
76 krb5int_rd_chpw_rep(krb5_context context, krb5_auth_context auth_context,
77 krb5_data *packet, int *result_code, krb5_data *result_data)
82 krb5_ap_rep_enc_part *ap_rep_enc;
84 krb5_data cipherresult;
85 krb5_data clearresult;
87 krb5_replay_data replay;
90 if (packet->length < 4)
91 /* either this, or the server is printing bad messages,
92 or the caller passed in garbage */
93 return(KRB5KRB_AP_ERR_MODIFIED);
99 plen = (*ptr++ & 0xff);
100 plen = (plen<<8) | (*ptr++ & 0xff);
102 if (plen != packet->length) {
104 * MS KDCs *may* send back a KRB_ERROR. Although
105 * not 100% correct via RFC3244, it's something
106 * we can workaround here.
108 if (krb5_is_krb_error(packet)) {
110 if ((ret = krb5_rd_error(context, packet, &krberror)))
113 if (krberror->e_data.data == NULL) {
114 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
115 krb5_free_error(context, krberror);
119 return(KRB5KRB_AP_ERR_MODIFIED);
124 /* verify version number */
126 vno = (*ptr++ & 0xff);
127 vno = (vno<<8) | (*ptr++ & 0xff);
130 return(KRB5KDC_ERR_BAD_PVNO);
132 /* read, check ap-rep length */
134 ap_rep.length = (*ptr++ & 0xff);
135 ap_rep.length = (ap_rep.length<<8) | (*ptr++ & 0xff);
137 if (ptr + ap_rep.length >= packet->data + packet->length)
138 return(KRB5KRB_AP_ERR_MODIFIED);
143 ptr += ap_rep.length;
146 * Save send_subkey to later smash recv_subkey.
148 ret = krb5_auth_con_getsendsubkey(context, auth_context, &tmp);
152 ret = krb5_rd_rep(context, auth_context, &ap_rep, &ap_rep_enc);
154 krb5_free_keyblock(context, tmp);
158 krb5_free_ap_rep_enc_part(context, ap_rep_enc);
160 /* extract and decrypt the result */
162 cipherresult.data = ptr;
163 cipherresult.length = (packet->data + packet->length) - ptr;
166 * Smash recv_subkey to be send_subkey, per spec.
168 ret = krb5_auth_con_setrecvsubkey(context, auth_context, tmp);
169 krb5_free_keyblock(context, tmp);
173 ret = krb5_rd_priv(context, auth_context, &cipherresult, &clearresult,
179 cipherresult.data = ptr;
180 cipherresult.length = (packet->data + packet->length) - ptr;
182 if ((ret = krb5_rd_error(context, &cipherresult, &krberror)))
185 clearresult = krberror->e_data;
188 if (clearresult.length < 2) {
189 ret = KRB5KRB_AP_ERR_MODIFIED;
193 ptr = clearresult.data;
195 *result_code = (*ptr++ & 0xff);
196 *result_code = (*result_code<<8) | (*ptr++ & 0xff);
198 if ((*result_code < KRB5_KPASSWD_SUCCESS) ||
199 (*result_code > KRB5_KPASSWD_INITIAL_FLAG_NEEDED)) {
200 ret = KRB5KRB_AP_ERR_MODIFIED;
204 /* all success replies should be authenticated/encrypted */
206 if ((ap_rep.length == 0) && (*result_code == KRB5_KPASSWD_SUCCESS)) {
207 ret = KRB5KRB_AP_ERR_MODIFIED;
211 result_data->length = (clearresult.data + clearresult.length) - ptr;
213 if (result_data->length) {
214 result_data->data = (char *) malloc(result_data->length);
215 if (result_data->data == NULL) {
219 memcpy(result_data->data, ptr, result_data->length);
221 result_data->data = NULL;
228 krb5_xfree(clearresult.data);
230 krb5_free_error(context, krberror);
236 krb5_error_code KRB5_CALLCONV
237 krb5_chpw_result_code_string(krb5_context context, int result_code,
240 switch (result_code) {
241 case KRB5_KPASSWD_MALFORMED:
242 *code_string = "Malformed request error";
244 case KRB5_KPASSWD_HARDERROR:
245 *code_string = "Server error";
247 case KRB5_KPASSWD_AUTHERROR:
248 *code_string = "Authentication error";
250 case KRB5_KPASSWD_SOFTERROR:
251 *code_string = "Password change rejected";
254 *code_string = "Password change failed";
262 krb5int_mk_setpw_req(krb5_context context,
263 krb5_auth_context auth_context,
265 krb5_principal targprinc,
271 krb5_data *encoded_setpw;
272 struct krb5_setpw_req req;
276 cipherpw.data = NULL;
279 if ((ret = krb5_auth_con_setflags(context, auth_context,
280 KRB5_AUTH_CONTEXT_DO_SEQUENCE)))
283 req.target = targprinc;
284 req.password.data = passwd;
285 req.password.length = strlen(passwd);
286 ret = encode_krb5_setpw_req(&req, &encoded_setpw);
291 if ((ret = krb5_mk_priv(context, auth_context, encoded_setpw, &cipherpw, NULL)) != 0) {
292 krb5_free_data(context, encoded_setpw);
295 krb5_free_data(context, encoded_setpw);
298 packet->length = 6 + ap_req->length + cipherpw.length;
299 packet->data = (char *) malloc(packet->length);
300 if (packet->data == NULL) {
306 ** build the packet -
308 /* put in the length */
309 store_16_be(packet->length, ptr);
311 /* put in the version */
314 /* the ap_req length is big endian */
315 store_16_be(ap_req->length, ptr);
317 /* put in the request data */
318 memcpy(ptr, ap_req->data, ap_req->length);
319 ptr += ap_req->length;
321 ** put in the "private" password data -
323 memcpy(ptr, cipherpw.data, cipherpw.length);
327 krb5_free_data_contents(context, &cipherpw);
328 if ((ret != 0) && packet->data) {
336 krb5int_rd_setpw_rep(krb5_context context, krb5_auth_context auth_context,
338 int *result_code, krb5_data *result_data)
341 unsigned int message_length, version_number;
343 krb5_ap_rep_enc_part *ap_rep_enc;
345 krb5_data cipherresult;
346 krb5_data clearresult;
347 krb5_keyblock *tmpkey;
349 ** validate the packet length -
351 if (packet->length < 4)
352 return(KRB5KRB_AP_ERR_MODIFIED);
357 ** see if it is an error
359 if (krb5_is_krb_error(packet)) {
360 krb5_error *krberror;
361 if ((ret = krb5_rd_error(context, packet, &krberror)))
363 if (krberror->e_data.data == NULL) {
364 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
365 krb5_free_error(context, krberror);
368 clearresult = krberror->e_data;
369 krberror->e_data.data = NULL; /*So we can free it later*/
370 krberror->e_data.length = 0;
371 krb5_free_error(context, krberror);
373 } else { /* Not an error*/
376 ** validate the message length -
377 ** length is big endian
379 message_length = (((ptr[0] << 8)&0xff) | (ptr[1]&0xff));
382 ** make sure the message length and packet length agree -
384 if (message_length != packet->length)
385 return(KRB5KRB_AP_ERR_MODIFIED);
387 ** get the version number -
389 version_number = (((ptr[0] << 8)&0xff) | (ptr[1]&0xff));
392 ** make sure we support the version returned -
395 ** set password version is 0xff80, change password version is 1
397 if (version_number != 1 && version_number != 0xff80)
398 return(KRB5KDC_ERR_BAD_PVNO);
400 ** now fill in ap_rep with the reply -
403 ** get the reply length -
405 ap_rep.length = (((ptr[0] << 8)&0xff) | (ptr[1]&0xff));
408 ** validate ap_rep length agrees with the packet length -
410 if (ptr + ap_rep.length >= packet->data + packet->length)
411 return(KRB5KRB_AP_ERR_MODIFIED);
413 ** if data was returned, set the ap_rep ptr -
417 ptr += ap_rep.length;
420 * Save send_subkey to later smash recv_subkey.
422 ret = krb5_auth_con_getsendsubkey(context, auth_context, &tmpkey);
426 ret = krb5_rd_rep(context, auth_context, &ap_rep, &ap_rep_enc);
428 krb5_free_keyblock(context, tmpkey);
432 krb5_free_ap_rep_enc_part(context, ap_rep_enc);
434 ** now decrypt the result -
436 cipherresult.data = ptr;
437 cipherresult.length = (packet->data + packet->length) - ptr;
440 * Smash recv_subkey to be send_subkey, per spec.
442 ret = krb5_auth_con_setrecvsubkey(context, auth_context, tmpkey);
443 krb5_free_keyblock(context, tmpkey);
447 ret = krb5_rd_priv(context, auth_context, &cipherresult, &clearresult,
451 } /*We got an ap_rep*/
453 return (KRB5KRB_AP_ERR_MODIFIED);
454 } /*Response instead of error*/
457 ** validate the cleartext length
459 if (clearresult.length < 2) {
460 ret = KRB5KRB_AP_ERR_MODIFIED;
464 ** now decode the result -
466 ptr = clearresult.data;
468 *result_code = (((ptr[0] << 8)&0xff) | (ptr[1]&0xff));
472 ** result code 5 is access denied
474 if ((*result_code < KRB5_KPASSWD_SUCCESS) || (*result_code > 5)) {
475 ret = KRB5KRB_AP_ERR_MODIFIED;
479 ** all success replies should be authenticated/encrypted
481 if ((ap_rep.length == 0) && (*result_code == KRB5_KPASSWD_SUCCESS)) {
482 ret = KRB5KRB_AP_ERR_MODIFIED;
487 result_data->length = (clearresult.data + clearresult.length) - ptr;
489 if (result_data->length) {
490 result_data->data = (char *) malloc(result_data->length);
491 if (result_data->data)
492 memcpy(result_data->data, ptr, result_data->length);
494 result_data->data = NULL;
499 krb5_free_data_contents(context, &clearresult);
504 krb5int_setpw_result_code_string(krb5_context context, int result_code,
505 const char **code_string)
507 switch (result_code) {
508 case KRB5_KPASSWD_MALFORMED:
509 *code_string = "Malformed request error";
511 case KRB5_KPASSWD_HARDERROR:
512 *code_string = "Server error";
514 case KRB5_KPASSWD_AUTHERROR:
515 *code_string = "Authentication error";
517 case KRB5_KPASSWD_SOFTERROR:
518 *code_string = "Password change rejected";
520 case 5: /* access denied */
521 *code_string = "Access denied";
523 case 6: /* bad version */
524 *code_string = "Wrong protocol version";
526 case 7: /* initial flag is needed */
527 *code_string = "Initial password required";
530 *code_string = "Success";
532 *code_string = "Password change failed";