155682Smarkm/* 2233294Sstas * Copyright (c) 1997 - 2001, 2003 Kungliga Tekniska H��gskolan 3233294Sstas * (Royal Institute of Technology, Stockholm, Sweden). 4233294Sstas * All rights reserved. 555682Smarkm * 6233294Sstas * Redistribution and use in source and binary forms, with or without 7233294Sstas * modification, are permitted provided that the following conditions 8233294Sstas * are met: 955682Smarkm * 10233294Sstas * 1. Redistributions of source code must retain the above copyright 11233294Sstas * notice, this list of conditions and the following disclaimer. 1255682Smarkm * 13233294Sstas * 2. Redistributions in binary form must reproduce the above copyright 14233294Sstas * notice, this list of conditions and the following disclaimer in the 15233294Sstas * documentation and/or other materials provided with the distribution. 1655682Smarkm * 17233294Sstas * 3. Neither the name of the Institute nor the names of its contributors 18233294Sstas * may be used to endorse or promote products derived from this software 19233294Sstas * without specific prior written permission. 2055682Smarkm * 21233294Sstas * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22233294Sstas * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23233294Sstas * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24233294Sstas * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25233294Sstas * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26233294Sstas * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27233294Sstas * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28233294Sstas * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29233294Sstas * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30233294Sstas * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31233294Sstas * SUCH DAMAGE. 3255682Smarkm */ 3355682Smarkm 3455682Smarkm#include "krb5_locl.h" 3555682Smarkm 3655682Smarkm/* this is an attempt at one of the most horrible `compression' 3755682Smarkm schemes that has ever been invented; it's so amazingly brain-dead 3855682Smarkm that words can not describe it, and all this just to save a few 3955682Smarkm silly bytes */ 4055682Smarkm 4155682Smarkmstruct tr_realm { 4255682Smarkm char *realm; 4355682Smarkm unsigned leading_space:1; 4455682Smarkm unsigned leading_slash:1; 4555682Smarkm unsigned trailing_dot:1; 4655682Smarkm struct tr_realm *next; 4755682Smarkm}; 4855682Smarkm 4955682Smarkmstatic void 5055682Smarkmfree_realms(struct tr_realm *r) 5155682Smarkm{ 5255682Smarkm struct tr_realm *p; 5355682Smarkm while(r){ 5455682Smarkm p = r; 5555682Smarkm r = r->next; 5655682Smarkm free(p->realm); 5755682Smarkm free(p); 58233294Sstas } 5955682Smarkm} 6055682Smarkm 6155682Smarkmstatic int 6278527Sassarmake_path(krb5_context context, struct tr_realm *r, 6378527Sassar const char *from, const char *to) 6455682Smarkm{ 65233294Sstas struct tr_realm *tmp; 6655682Smarkm const char *p; 6755682Smarkm 6855682Smarkm if(strlen(from) < strlen(to)){ 69178825Sdfr const char *str; 70178825Sdfr str = from; 7155682Smarkm from = to; 72178825Sdfr to = str; 7355682Smarkm } 74233294Sstas 7555682Smarkm if(strcmp(from + strlen(from) - strlen(to), to) == 0){ 7655682Smarkm p = from; 7755682Smarkm while(1){ 7855682Smarkm p = strchr(p, '.'); 7978527Sassar if(p == NULL) { 80233294Sstas krb5_clear_error_message (context); 8155682Smarkm return KRB5KDC_ERR_POLICY; 8278527Sassar } 8355682Smarkm p++; 8455682Smarkm if(strcmp(p, to) == 0) 8555682Smarkm break; 8655682Smarkm tmp = calloc(1, sizeof(*tmp)); 87233294Sstas if(tmp == NULL) 88233294Sstas return krb5_enomem(context); 89233294Sstas tmp->next = r->next; 90233294Sstas r->next = tmp; 91233294Sstas tmp->realm = strdup(p); 92233294Sstas if(tmp->realm == NULL){ 93233294Sstas r->next = tmp->next; 94233294Sstas free(tmp); 95233294Sstas return krb5_enomem(context); 96178825Sdfr } 9755682Smarkm } 9855682Smarkm }else if(strncmp(from, to, strlen(to)) == 0){ 9955682Smarkm p = from + strlen(from); 10055682Smarkm while(1){ 10155682Smarkm while(p >= from && *p != '/') p--; 102233294Sstas if(p == from) 10355682Smarkm return KRB5KDC_ERR_POLICY; 104233294Sstas 10555682Smarkm if(strncmp(to, from, p - from) == 0) 10655682Smarkm break; 10755682Smarkm tmp = calloc(1, sizeof(*tmp)); 108233294Sstas if(tmp == NULL) 109233294Sstas return krb5_enomem(context); 110233294Sstas tmp->next = r->next; 111233294Sstas r->next = tmp; 112233294Sstas tmp->realm = malloc(p - from + 1); 113233294Sstas if(tmp->realm == NULL){ 114233294Sstas r->next = tmp->next; 115233294Sstas free(tmp); 116233294Sstas return krb5_enomem(context); 117178825Sdfr } 118233294Sstas memcpy(tmp->realm, from, p - from); 119233294Sstas tmp->realm[p - from] = '\0'; 12055682Smarkm p--; 12155682Smarkm } 12278527Sassar } else { 123233294Sstas krb5_clear_error_message (context); 12455682Smarkm return KRB5KDC_ERR_POLICY; 12578527Sassar } 126233294Sstas 12755682Smarkm return 0; 12855682Smarkm} 12955682Smarkm 13055682Smarkmstatic int 13178527Sassarmake_paths(krb5_context context, 132233294Sstas struct tr_realm *realms, const char *client_realm, 13355682Smarkm const char *server_realm) 13455682Smarkm{ 13555682Smarkm struct tr_realm *r; 13655682Smarkm int ret; 13755682Smarkm const char *prev_realm = client_realm; 13855682Smarkm const char *next_realm = NULL; 13955682Smarkm for(r = realms; r; r = r->next){ 14055682Smarkm /* it *might* be that you can have more than one empty 14155682Smarkm component in a row, at least that's how I interpret the 14255682Smarkm "," exception in 1510 */ 14355682Smarkm if(r->realm[0] == '\0'){ 14455682Smarkm while(r->next && r->next->realm[0] == '\0') 14555682Smarkm r = r->next; 14655682Smarkm if(r->next) 14755682Smarkm next_realm = r->next->realm; 14855682Smarkm else 14955682Smarkm next_realm = server_realm; 15078527Sassar ret = make_path(context, r, prev_realm, next_realm); 15155682Smarkm if(ret){ 15255682Smarkm free_realms(realms); 15355682Smarkm return ret; 15455682Smarkm } 15555682Smarkm } 15655682Smarkm prev_realm = r->realm; 15755682Smarkm } 15855682Smarkm return 0; 15955682Smarkm} 16055682Smarkm 16155682Smarkmstatic int 16278527Sassarexpand_realms(krb5_context context, 16378527Sassar struct tr_realm *realms, const char *client_realm) 16455682Smarkm{ 16555682Smarkm struct tr_realm *r; 16655682Smarkm const char *prev_realm = NULL; 16755682Smarkm for(r = realms; r; r = r->next){ 16855682Smarkm if(r->trailing_dot){ 16955682Smarkm char *tmp; 170178825Sdfr size_t len; 171120945Snectar 17255682Smarkm if(prev_realm == NULL) 17355682Smarkm prev_realm = client_realm; 174178825Sdfr 175178825Sdfr len = strlen(r->realm) + strlen(prev_realm) + 1; 176178825Sdfr 177120945Snectar tmp = realloc(r->realm, len); 17855682Smarkm if(tmp == NULL){ 17955682Smarkm free_realms(realms); 180233294Sstas return krb5_enomem(context); 18155682Smarkm } 18255682Smarkm r->realm = tmp; 183120945Snectar strlcat(r->realm, prev_realm, len); 18455682Smarkm }else if(r->leading_slash && !r->leading_space && prev_realm){ 18555682Smarkm /* yet another exception: if you use x500-names, the 18655682Smarkm leading realm doesn't have to be "quoted" with a space */ 18755682Smarkm char *tmp; 188120945Snectar size_t len = strlen(r->realm) + strlen(prev_realm) + 1; 189120945Snectar 190120945Snectar tmp = malloc(len); 19155682Smarkm if(tmp == NULL){ 19255682Smarkm free_realms(realms); 193233294Sstas return krb5_enomem(context); 19455682Smarkm } 195120945Snectar strlcpy(tmp, prev_realm, len); 196120945Snectar strlcat(tmp, r->realm, len); 19755682Smarkm free(r->realm); 19855682Smarkm r->realm = tmp; 19955682Smarkm } 20055682Smarkm prev_realm = r->realm; 20155682Smarkm } 20255682Smarkm return 0; 20355682Smarkm} 20455682Smarkm 20555682Smarkmstatic struct tr_realm * 20655682Smarkmmake_realm(char *realm) 20755682Smarkm{ 20855682Smarkm struct tr_realm *r; 20955682Smarkm char *p, *q; 21055682Smarkm int quote = 0; 21155682Smarkm r = calloc(1, sizeof(*r)); 21255682Smarkm if(r == NULL){ 21355682Smarkm free(realm); 21455682Smarkm return NULL; 21555682Smarkm } 21655682Smarkm r->realm = realm; 21755682Smarkm for(p = q = r->realm; *p; p++){ 21855682Smarkm if(p == r->realm && *p == ' '){ 21955682Smarkm r->leading_space = 1; 22055682Smarkm continue; 22155682Smarkm } 22255682Smarkm if(q == r->realm && *p == '/') 22355682Smarkm r->leading_slash = 1; 22455682Smarkm if(quote){ 22555682Smarkm *q++ = *p; 22655682Smarkm quote = 0; 22755682Smarkm continue; 22855682Smarkm } 22955682Smarkm if(*p == '\\'){ 23055682Smarkm quote = 1; 23155682Smarkm continue; 23255682Smarkm } 23355682Smarkm if(p[0] == '.' && p[1] == '\0') 23455682Smarkm r->trailing_dot = 1; 23555682Smarkm *q++ = *p; 23655682Smarkm } 23755682Smarkm *q = '\0'; 23855682Smarkm return r; 23955682Smarkm} 24055682Smarkm 24155682Smarkmstatic struct tr_realm* 24255682Smarkmappend_realm(struct tr_realm *head, struct tr_realm *r) 24355682Smarkm{ 24455682Smarkm struct tr_realm *p; 24555682Smarkm if(head == NULL){ 24655682Smarkm r->next = NULL; 24755682Smarkm return r; 24855682Smarkm } 24955682Smarkm p = head; 25055682Smarkm while(p->next) p = p->next; 25155682Smarkm p->next = r; 25255682Smarkm return head; 25355682Smarkm} 25455682Smarkm 25555682Smarkmstatic int 25678527Sassardecode_realms(krb5_context context, 25778527Sassar const char *tr, int length, struct tr_realm **realms) 25855682Smarkm{ 25955682Smarkm struct tr_realm *r = NULL; 26055682Smarkm 26155682Smarkm char *tmp; 26255682Smarkm int quote = 0; 26355682Smarkm const char *start = tr; 26455682Smarkm int i; 26555682Smarkm 26655682Smarkm for(i = 0; i < length; i++){ 26755682Smarkm if(quote){ 26855682Smarkm quote = 0; 26955682Smarkm continue; 27055682Smarkm } 27155682Smarkm if(tr[i] == '\\'){ 27255682Smarkm quote = 1; 27355682Smarkm continue; 27455682Smarkm } 27555682Smarkm if(tr[i] == ','){ 27655682Smarkm tmp = malloc(tr + i - start + 1); 277233294Sstas if(tmp == NULL) 278233294Sstas return krb5_enomem(context); 27957416Smarkm memcpy(tmp, start, tr + i - start); 28055682Smarkm tmp[tr + i - start] = '\0'; 28155682Smarkm r = make_realm(tmp); 28255682Smarkm if(r == NULL){ 28355682Smarkm free_realms(*realms); 284233294Sstas return krb5_enomem(context); 28555682Smarkm } 28655682Smarkm *realms = append_realm(*realms, r); 28755682Smarkm start = tr + i + 1; 28855682Smarkm } 28955682Smarkm } 29055682Smarkm tmp = malloc(tr + i - start + 1); 291178825Sdfr if(tmp == NULL){ 292178825Sdfr free(*realms); 293233294Sstas return krb5_enomem(context); 294178825Sdfr } 29557416Smarkm memcpy(tmp, start, tr + i - start); 29655682Smarkm tmp[tr + i - start] = '\0'; 29755682Smarkm r = make_realm(tmp); 29855682Smarkm if(r == NULL){ 29955682Smarkm free_realms(*realms); 300233294Sstas return krb5_enomem(context); 30155682Smarkm } 30255682Smarkm *realms = append_realm(*realms, r); 303233294Sstas 30455682Smarkm return 0; 30555682Smarkm} 30655682Smarkm 30755682Smarkm 308233294SstasKRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 30978527Sassarkrb5_domain_x500_decode(krb5_context context, 310233294Sstas krb5_data tr, char ***realms, unsigned int *num_realms, 31155682Smarkm const char *client_realm, const char *server_realm) 31255682Smarkm{ 31355682Smarkm struct tr_realm *r = NULL; 31455682Smarkm struct tr_realm *p, **q; 31555682Smarkm int ret; 316233294Sstas 317127808Snectar if(tr.length == 0) { 318127808Snectar *realms = NULL; 319127808Snectar *num_realms = 0; 320127808Snectar return 0; 321127808Snectar } 322127808Snectar 32355682Smarkm /* split string in components */ 32478527Sassar ret = decode_realms(context, tr.data, tr.length, &r); 32555682Smarkm if(ret) 32655682Smarkm return ret; 327233294Sstas 32855682Smarkm /* apply prefix rule */ 32978527Sassar ret = expand_realms(context, r, client_realm); 33055682Smarkm if(ret) 33155682Smarkm return ret; 332233294Sstas 33378527Sassar ret = make_paths(context, r, client_realm, server_realm); 33455682Smarkm if(ret) 33555682Smarkm return ret; 336233294Sstas 337103423Snectar /* remove empty components and count realms */ 338103423Snectar *num_realms = 0; 339233294Sstas for(q = &r; *q; ){ 340233294Sstas if((*q)->realm[0] == '\0'){ 341233294Sstas p = *q; 342233294Sstas *q = (*q)->next; 34355682Smarkm free(p->realm); 34455682Smarkm free(p); 34555682Smarkm }else{ 346233294Sstas q = &(*q)->next; 347103423Snectar (*num_realms)++; 34855682Smarkm } 34955682Smarkm } 350233294Sstas if (*num_realms + 1 > UINT_MAX/sizeof(**realms)) 351103423Snectar return ERANGE; 352103423Snectar 35355682Smarkm { 35455682Smarkm char **R; 355103423Snectar R = malloc((*num_realms + 1) * sizeof(*R)); 356103423Snectar if (R == NULL) 357233294Sstas return krb5_enomem(context); 358103423Snectar *realms = R; 35955682Smarkm while(r){ 360103423Snectar *R++ = r->realm; 36155682Smarkm p = r->next; 36255682Smarkm free(r); 36355682Smarkm r = p; 36455682Smarkm } 36555682Smarkm } 36655682Smarkm return 0; 36755682Smarkm} 36855682Smarkm 369233294SstasKRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 370233294Sstaskrb5_domain_x500_encode(char **realms, unsigned int num_realms, 371233294Sstas krb5_data *encoding) 37255682Smarkm{ 37355682Smarkm char *s = NULL; 37455682Smarkm int len = 0; 375233294Sstas unsigned int i; 376127808Snectar krb5_data_zero(encoding); 377127808Snectar if (num_realms == 0) 378127808Snectar return 0; 37955682Smarkm for(i = 0; i < num_realms; i++){ 38055682Smarkm len += strlen(realms[i]); 38155682Smarkm if(realms[i][0] == '/') 38255682Smarkm len++; 38355682Smarkm } 38455682Smarkm len += num_realms - 1; 38555682Smarkm s = malloc(len + 1); 386127808Snectar if (s == NULL) 387127808Snectar return ENOMEM; 38855682Smarkm *s = '\0'; 38955682Smarkm for(i = 0; i < num_realms; i++){ 390233294Sstas if(i) 391120945Snectar strlcat(s, ",", len + 1); 39255682Smarkm if(realms[i][0] == '/') 393120945Snectar strlcat(s, " ", len + 1); 394120945Snectar strlcat(s, realms[i], len + 1); 39555682Smarkm } 39655682Smarkm encoding->data = s; 39755682Smarkm encoding->length = strlen(s); 39855682Smarkm return 0; 39955682Smarkm} 40055682Smarkm 401233294SstasKRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 402127808Snectarkrb5_check_transited(krb5_context context, 403127808Snectar krb5_const_realm client_realm, 404127808Snectar krb5_const_realm server_realm, 405127808Snectar krb5_realm *realms, 406233294Sstas unsigned int num_realms, 407127808Snectar int *bad_realm) 408127808Snectar{ 409127808Snectar char **tr_realms; 410127808Snectar char **p; 411233294Sstas size_t i; 412127808Snectar 413127808Snectar if(num_realms == 0) 414127808Snectar return 0; 415233294Sstas 416233294Sstas tr_realms = krb5_config_get_strings(context, NULL, 417233294Sstas "capaths", 418233294Sstas client_realm, 419233294Sstas server_realm, 420127808Snectar NULL); 421127808Snectar for(i = 0; i < num_realms; i++) { 422127808Snectar for(p = tr_realms; p && *p; p++) { 423127808Snectar if(strcmp(*p, realms[i]) == 0) 424127808Snectar break; 425127808Snectar } 426127808Snectar if(p == NULL || *p == NULL) { 427127808Snectar krb5_config_free_strings(tr_realms); 428233294Sstas krb5_set_error_message (context, KRB5KRB_AP_ERR_ILL_CR_TKT, 429233294Sstas N_("no transit allowed " 430233294Sstas "through realm %s", ""), 431233294Sstas realms[i]); 432127808Snectar if(bad_realm) 433127808Snectar *bad_realm = i; 434127808Snectar return KRB5KRB_AP_ERR_ILL_CR_TKT; 435127808Snectar } 436127808Snectar } 437127808Snectar krb5_config_free_strings(tr_realms); 438127808Snectar return 0; 439127808Snectar} 440127808Snectar 441233294SstasKRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 44257419Smarkmkrb5_check_transited_realms(krb5_context context, 443233294Sstas const char *const *realms, 444233294Sstas unsigned int num_realms, 44557419Smarkm int *bad_realm) 44657419Smarkm{ 447233294Sstas size_t i; 44857419Smarkm int ret = 0; 449233294Sstas char **bad_realms = krb5_config_get_strings(context, NULL, 450233294Sstas "libdefaults", 451233294Sstas "transited_realms_reject", 45257419Smarkm NULL); 45357419Smarkm if(bad_realms == NULL) 45457419Smarkm return 0; 45557419Smarkm 45657419Smarkm for(i = 0; i < num_realms; i++) { 45757419Smarkm char **p; 45857419Smarkm for(p = bad_realms; *p; p++) 45957419Smarkm if(strcmp(*p, realms[i]) == 0) { 46057419Smarkm ret = KRB5KRB_AP_ERR_ILL_CR_TKT; 461233294Sstas krb5_set_error_message (context, ret, 462233294Sstas N_("no transit allowed " 463233294Sstas "through realm %s", ""), 464233294Sstas *p); 46557419Smarkm if(bad_realm) 46657419Smarkm *bad_realm = i; 46757419Smarkm break; 46857419Smarkm } 46957419Smarkm } 47057419Smarkm krb5_config_free_strings(bad_realms); 47157419Smarkm return ret; 47257419Smarkm} 47357419Smarkm 47455682Smarkm#if 0 47555682Smarkmint 47655682Smarkmmain(int argc, char **argv) 47755682Smarkm{ 47855682Smarkm krb5_data x; 47955682Smarkm char **r; 48055682Smarkm int num, i; 48155682Smarkm x.data = argv[1]; 48255682Smarkm x.length = strlen(x.data); 48355682Smarkm if(domain_expand(x, &r, &num, argv[2], argv[3])) 48455682Smarkm exit(1); 48555682Smarkm for(i = 0; i < num; i++) 48655682Smarkm printf("%s\n", r[i]); 48755682Smarkm return 0; 48855682Smarkm} 48955682Smarkm#endif 49055682Smarkm 491