diff options
Diffstat (limited to 'source4/heimdal/lib/krb5/transited.c')
-rw-r--r-- | source4/heimdal/lib/krb5/transited.c | 481 |
1 files changed, 481 insertions, 0 deletions
diff --git a/source4/heimdal/lib/krb5/transited.c b/source4/heimdal/lib/krb5/transited.c new file mode 100644 index 0000000000..9e24db0da0 --- /dev/null +++ b/source4/heimdal/lib/krb5/transited.c @@ -0,0 +1,481 @@ +/* + * Copyright (c) 1997 - 2001, 2003 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: transited.c,v 1.16 2005/06/17 04:53:35 lha Exp $"); + +/* this is an attempt at one of the most horrible `compression' + schemes that has ever been invented; it's so amazingly brain-dead + that words can not describe it, and all this just to save a few + silly bytes */ + +struct tr_realm { + char *realm; + unsigned leading_space:1; + unsigned leading_slash:1; + unsigned trailing_dot:1; + struct tr_realm *next; +}; + +static void +free_realms(struct tr_realm *r) +{ + struct tr_realm *p; + while(r){ + p = r; + r = r->next; + free(p->realm); + free(p); + } +} + +static int +make_path(krb5_context context, struct tr_realm *r, + const char *from, const char *to) +{ + const char *p; + struct tr_realm *path = r->next; + struct tr_realm *tmp; + + if(strlen(from) < strlen(to)){ + const char *str; + str = from; + from = to; + to = str; + } + + if(strcmp(from + strlen(from) - strlen(to), to) == 0){ + p = from; + while(1){ + p = strchr(p, '.'); + if(p == NULL) { + krb5_clear_error_string (context); + return KRB5KDC_ERR_POLICY; + } + p++; + if(strcmp(p, to) == 0) + break; + tmp = calloc(1, sizeof(*tmp)); + tmp->next = path; + path = tmp; + path->realm = strdup(p); + if(path->realm == NULL){ + r->next = path; /* XXX */ + krb5_set_error_string (context, "malloc: out of memory"); + return ENOMEM;; + } + } + }else if(strncmp(from, to, strlen(to)) == 0){ + p = from + strlen(from); + while(1){ + while(p >= from && *p != '/') p--; + if(p == from) + return KRB5KDC_ERR_POLICY; + if(strncmp(to, from, p - from) == 0) + break; + tmp = calloc(1, sizeof(*tmp)); + tmp->next = path; + path = tmp; + path->realm = malloc(p - from + 1); + if(path->realm == NULL){ + r->next = path; /* XXX */ + krb5_set_error_string (context, "malloc: out of memory"); + return ENOMEM; + } + memcpy(path->realm, from, p - from); + path->realm[p - from] = '\0'; + p--; + } + } else { + krb5_clear_error_string (context); + return KRB5KDC_ERR_POLICY; + } + r->next = path; + + return 0; +} + +static int +make_paths(krb5_context context, + struct tr_realm *realms, const char *client_realm, + const char *server_realm) +{ + struct tr_realm *r; + int ret; + const char *prev_realm = client_realm; + const char *next_realm = NULL; + for(r = realms; r; r = r->next){ + /* it *might* be that you can have more than one empty + component in a row, at least that's how I interpret the + "," exception in 1510 */ + if(r->realm[0] == '\0'){ + while(r->next && r->next->realm[0] == '\0') + r = r->next; + if(r->next) + next_realm = r->next->realm; + else + next_realm = server_realm; + ret = make_path(context, r, prev_realm, next_realm); + if(ret){ + free_realms(realms); + return ret; + } + } + prev_realm = r->realm; + } + return 0; +} + +static int +expand_realms(krb5_context context, + struct tr_realm *realms, const char *client_realm) +{ + struct tr_realm *r; + const char *prev_realm = NULL; + for(r = realms; r; r = r->next){ + if(r->trailing_dot){ + char *tmp; + size_t len = strlen(r->realm) + strlen(prev_realm) + 1; + + if(prev_realm == NULL) + prev_realm = client_realm; + tmp = realloc(r->realm, len); + if(tmp == NULL){ + free_realms(realms); + krb5_set_error_string (context, "malloc: out of memory"); + return ENOMEM; + } + r->realm = tmp; + strlcat(r->realm, prev_realm, len); + }else if(r->leading_slash && !r->leading_space && prev_realm){ + /* yet another exception: if you use x500-names, the + leading realm doesn't have to be "quoted" with a space */ + char *tmp; + size_t len = strlen(r->realm) + strlen(prev_realm) + 1; + + tmp = malloc(len); + if(tmp == NULL){ + free_realms(realms); + krb5_set_error_string (context, "malloc: out of memory"); + return ENOMEM; + } + strlcpy(tmp, prev_realm, len); + strlcat(tmp, r->realm, len); + free(r->realm); + r->realm = tmp; + } + prev_realm = r->realm; + } + return 0; +} + +static struct tr_realm * +make_realm(char *realm) +{ + struct tr_realm *r; + char *p, *q; + int quote = 0; + r = calloc(1, sizeof(*r)); + if(r == NULL){ + free(realm); + return NULL; + } + r->realm = realm; + for(p = q = r->realm; *p; p++){ + if(p == r->realm && *p == ' '){ + r->leading_space = 1; + continue; + } + if(q == r->realm && *p == '/') + r->leading_slash = 1; + if(quote){ + *q++ = *p; + quote = 0; + continue; + } + if(*p == '\\'){ + quote = 1; + continue; + } + if(p[0] == '.' && p[1] == '\0') + r->trailing_dot = 1; + *q++ = *p; + } + *q = '\0'; + return r; +} + +static struct tr_realm* +append_realm(struct tr_realm *head, struct tr_realm *r) +{ + struct tr_realm *p; + if(head == NULL){ + r->next = NULL; + return r; + } + p = head; + while(p->next) p = p->next; + p->next = r; + return head; +} + +static int +decode_realms(krb5_context context, + const char *tr, int length, struct tr_realm **realms) +{ + struct tr_realm *r = NULL; + + char *tmp; + int quote = 0; + const char *start = tr; + int i; + + for(i = 0; i < length; i++){ + if(quote){ + quote = 0; + continue; + } + if(tr[i] == '\\'){ + quote = 1; + continue; + } + if(tr[i] == ','){ + tmp = malloc(tr + i - start + 1); + memcpy(tmp, start, tr + i - start); + tmp[tr + i - start] = '\0'; + r = make_realm(tmp); + if(r == NULL){ + free_realms(*realms); + krb5_set_error_string (context, "malloc: out of memory"); + return ENOMEM; + } + *realms = append_realm(*realms, r); + start = tr + i + 1; + } + } + tmp = malloc(tr + i - start + 1); + memcpy(tmp, start, tr + i - start); + tmp[tr + i - start] = '\0'; + r = make_realm(tmp); + if(r == NULL){ + free_realms(*realms); + krb5_set_error_string (context, "malloc: out of memory"); + return ENOMEM; + } + *realms = append_realm(*realms, r); + + return 0; +} + + +krb5_error_code KRB5_LIB_FUNCTION +krb5_domain_x500_decode(krb5_context context, + krb5_data tr, char ***realms, int *num_realms, + const char *client_realm, const char *server_realm) +{ + struct tr_realm *r = NULL; + struct tr_realm *p, **q; + int ret; + + if(tr.length == 0) { + *realms = NULL; + *num_realms = 0; + return 0; + } + + /* split string in components */ + ret = decode_realms(context, tr.data, tr.length, &r); + if(ret) + return ret; + + /* apply prefix rule */ + ret = expand_realms(context, r, client_realm); + if(ret) + return ret; + + ret = make_paths(context, r, client_realm, server_realm); + if(ret) + return ret; + + /* remove empty components and count realms */ + q = &r; + *num_realms = 0; + for(p = r; p; ){ + if(p->realm[0] == '\0'){ + free(p->realm); + *q = p->next; + free(p); + p = *q; + }else{ + q = &p->next; + p = p->next; + (*num_realms)++; + } + } + if (*num_realms < 0 || *num_realms + 1 > UINT_MAX/sizeof(**realms)) + return ERANGE; + + { + char **R; + R = malloc((*num_realms + 1) * sizeof(*R)); + if (R == NULL) + return ENOMEM; + *realms = R; + while(r){ + *R++ = r->realm; + p = r->next; + free(r); + r = p; + } + } + return 0; +} + +krb5_error_code KRB5_LIB_FUNCTION +krb5_domain_x500_encode(char **realms, int num_realms, krb5_data *encoding) +{ + char *s = NULL; + int len = 0; + int i; + krb5_data_zero(encoding); + if (num_realms == 0) + return 0; + for(i = 0; i < num_realms; i++){ + len += strlen(realms[i]); + if(realms[i][0] == '/') + len++; + } + len += num_realms - 1; + s = malloc(len + 1); + if (s == NULL) + return ENOMEM; + *s = '\0'; + for(i = 0; i < num_realms; i++){ + if(i && i < num_realms - 1) + strlcat(s, ",", len + 1); + if(realms[i][0] == '/') + strlcat(s, " ", len + 1); + strlcat(s, realms[i], len + 1); + } + encoding->data = s; + encoding->length = strlen(s); + return 0; +} + +krb5_error_code KRB5_LIB_FUNCTION +krb5_check_transited(krb5_context context, + krb5_const_realm client_realm, + krb5_const_realm server_realm, + krb5_realm *realms, + int num_realms, + int *bad_realm) +{ + char **tr_realms; + char **p; + int i; + + if(num_realms == 0) + return 0; + + tr_realms = krb5_config_get_strings(context, NULL, + "capaths", + client_realm, + server_realm, + NULL); + for(i = 0; i < num_realms; i++) { + for(p = tr_realms; p && *p; p++) { + if(strcmp(*p, realms[i]) == 0) + break; + } + if(p == NULL || *p == NULL) { + krb5_config_free_strings(tr_realms); + krb5_set_error_string (context, "no transit through realm %s", + realms[i]); + if(bad_realm) + *bad_realm = i; + return KRB5KRB_AP_ERR_ILL_CR_TKT; + } + } + krb5_config_free_strings(tr_realms); + return 0; +} + +krb5_error_code KRB5_LIB_FUNCTION +krb5_check_transited_realms(krb5_context context, + const char *const *realms, + int num_realms, + int *bad_realm) +{ + int i; + int ret = 0; + char **bad_realms = krb5_config_get_strings(context, NULL, + "libdefaults", + "transited_realms_reject", + NULL); + if(bad_realms == NULL) + return 0; + + for(i = 0; i < num_realms; i++) { + char **p; + for(p = bad_realms; *p; p++) + if(strcmp(*p, realms[i]) == 0) { + krb5_set_error_string (context, "no transit through realm %s", + *p); + ret = KRB5KRB_AP_ERR_ILL_CR_TKT; + if(bad_realm) + *bad_realm = i; + break; + } + } + krb5_config_free_strings(bad_realms); + return ret; +} + +#if 0 +int +main(int argc, char **argv) +{ + krb5_data x; + char **r; + int num, i; + x.data = argv[1]; + x.length = strlen(x.data); + if(domain_expand(x, &r, &num, argv[2], argv[3])) + exit(1); + for(i = 0; i < num; i++) + printf("%s\n", r[i]); + return 0; +} +#endif + |