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Add a new test script t_authdata.py and a C harness adata.c to test KDC authdata handling logic. KDB module authdata is not currently tested.
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| /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */ | ||
| /* tests/adata.c - Test harness for KDC authorization data */ | ||
| /* | ||
| * Copyright (C) 2014 by the Massachusetts Institute of Technology. | ||
| * All rights reserved. | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions | ||
| * are met: | ||
| * | ||
| * * Redistributions of source code must retain the above copyright | ||
| * notice, this list of conditions and the following disclaimer. | ||
| * | ||
| * * 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. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 | ||
| * COPYRIGHT HOLDER 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. | ||
| */ | ||
|
|
||
| /* | ||
| * Usage: ./adata [-c ccname] [-p clientprinc] serviceprinc | ||
| * [ad-type ad-contents ...] | ||
| * | ||
| * This program acquires credentials for the specified service principal, using | ||
| * the specified or default ccache, possibly including requested authdata. The | ||
| * resulting ticket is decrypted using the default keytab, and the authdata in | ||
| * the ticket are displayed to stdout. | ||
| * | ||
| * In the requested authdata types, the type may be prefixed with '?' for an | ||
| * AD-IF-RELEVANT container, '!' for an AD-MANDATORY-FOR-KDC container, or '^' | ||
| * for an AD-KDC-ISSUED container checksummed with a random AES256 key. | ||
| * Multiple prefixes may be specified for nested container. | ||
| * | ||
| * In the output, authdata containers will be flattened and displayed with the | ||
| * above prefixes, with AD-KDC-ISSUED containers verified using the ticket | ||
| * session key. Nested containers only display the prefix for the innermost | ||
| * container. | ||
| */ | ||
|
|
||
| #include <k5-int.h> | ||
| #include <ctype.h> | ||
|
|
||
| static krb5_context ctx; | ||
|
|
||
| static void display_authdata_list(krb5_authdata **list, krb5_keyblock *skey, | ||
| krb5_keyblock *tktkey, char prefix_byte); | ||
|
|
||
| static void | ||
| check(krb5_error_code code) | ||
| { | ||
| const char *errmsg; | ||
|
|
||
| if (code) { | ||
| errmsg = krb5_get_error_message(ctx, code); | ||
| fprintf(stderr, "%s\n", errmsg); | ||
| krb5_free_error_message(ctx, errmsg); | ||
| exit(1); | ||
| } | ||
| } | ||
|
|
||
| static krb5_authdatatype | ||
| get_type_for_prefix(int prefix_byte) | ||
| { | ||
| if (prefix_byte == '?') | ||
| return KRB5_AUTHDATA_IF_RELEVANT; | ||
| if (prefix_byte == '!') | ||
| return KRB5_AUTHDATA_MANDATORY_FOR_KDC; | ||
| if (prefix_byte == '^') | ||
| return KRB5_AUTHDATA_KDC_ISSUED; | ||
| abort(); | ||
| } | ||
|
|
||
| static int | ||
| get_prefix_byte(krb5_authdata *ad) | ||
| { | ||
| if (ad->ad_type == KRB5_AUTHDATA_IF_RELEVANT) | ||
| return '?'; | ||
| if (ad->ad_type == KRB5_AUTHDATA_MANDATORY_FOR_KDC) | ||
| return '!'; | ||
| if (ad->ad_type == KRB5_AUTHDATA_KDC_ISSUED) | ||
| return '^'; | ||
| abort(); | ||
| } | ||
|
|
||
| /* Construct a container of type ad_type for the single authdata element | ||
| * content. For KDC-ISSUED containers, use a random checksum key. */ | ||
| static krb5_authdata * | ||
| make_container(krb5_authdatatype ad_type, krb5_authdata *content) | ||
| { | ||
| krb5_authdata *list[2], **enclist, *ad; | ||
| krb5_keyblock kb; | ||
|
|
||
| list[0] = content; | ||
| list[1] = NULL; | ||
|
|
||
| if (ad_type == KRB5_AUTHDATA_KDC_ISSUED) { | ||
| check(krb5_c_make_random_key(ctx, ENCTYPE_AES256_CTS_HMAC_SHA1_96, | ||
| &kb)); | ||
| check(krb5_make_authdata_kdc_issued(ctx, &kb, NULL, list, &enclist)); | ||
| krb5_free_keyblock_contents(ctx, &kb); | ||
| } else { | ||
| check(krb5_encode_authdata_container(ctx, ad_type, list, &enclist)); | ||
| } | ||
|
|
||
| /* Grab the first element from the encoded list and free the array. */ | ||
| ad = enclist[0]; | ||
| free(enclist); | ||
| return ad; | ||
| } | ||
|
|
||
| /* Parse typestr and contents into an authdata element. */ | ||
| static krb5_authdata * | ||
| make_authdata(const char *typestr, const char *contents) | ||
| { | ||
| krb5_authdata *inner_ad, *ad; | ||
|
|
||
| if (*typestr == '?' || *typestr == '!' || *typestr == '^') { | ||
| inner_ad = make_authdata(typestr + 1, contents); | ||
| return make_container(get_type_for_prefix(*typestr), inner_ad); | ||
| } | ||
|
|
||
| ad = malloc(sizeof(*ad)); | ||
| assert(ad != NULL); | ||
| ad->magic = KV5M_AUTHDATA; | ||
| ad->ad_type = atoi(typestr); | ||
| ad->length = strlen(contents); | ||
| ad->contents = (unsigned char *)strdup(contents); | ||
| assert(ad->contents != NULL); | ||
| return ad; | ||
| } | ||
|
|
||
| static krb5_authdata ** | ||
| get_container_contents(krb5_authdata *ad, krb5_keyblock *skey, | ||
| krb5_keyblock *tktkey) | ||
| { | ||
| krb5_authdata **inner_ad; | ||
|
|
||
| if (ad->ad_type == KRB5_AUTHDATA_KDC_ISSUED) | ||
| check(krb5_verify_authdata_kdc_issued(ctx, skey, ad, NULL, &inner_ad)); | ||
| else | ||
| check(krb5_decode_authdata_container(ctx, ad->ad_type, ad, &inner_ad)); | ||
| return inner_ad; | ||
| } | ||
|
|
||
| /* Display ad as either a hex dump or ASCII text. */ | ||
| static void | ||
| display_binary_or_ascii(krb5_authdata *ad) | ||
| { | ||
| krb5_boolean binary = FALSE; | ||
| unsigned char *p; | ||
|
|
||
| for (p = ad->contents; p < ad->contents + ad->length; p++) { | ||
| if (!isascii(*p) || !isprint(*p)) | ||
| binary = TRUE; | ||
| } | ||
| if (binary) { | ||
| for (p = ad->contents; p < ad->contents + ad->length; p++) | ||
| printf("%02X", *p); | ||
| } else { | ||
| printf("%.*s", (int)ad->length, ad->contents); | ||
| } | ||
| } | ||
|
|
||
| /* Display the contents of an authdata element, prefixed by prefix_byte. skey | ||
| * must be the ticket session key. */ | ||
| static void | ||
| display_authdata(krb5_authdata *ad, krb5_keyblock *skey, krb5_keyblock *tktkey, | ||
| int prefix_byte) | ||
| { | ||
| krb5_authdata **inner_ad; | ||
|
|
||
| if (ad->ad_type == KRB5_AUTHDATA_IF_RELEVANT || | ||
| ad->ad_type == KRB5_AUTHDATA_MANDATORY_FOR_KDC || | ||
| ad->ad_type == KRB5_AUTHDATA_KDC_ISSUED) { | ||
| /* Decode and display the contents. */ | ||
| inner_ad = get_container_contents(ad, skey, tktkey); | ||
| display_authdata_list(inner_ad, skey, tktkey, get_prefix_byte(ad)); | ||
| krb5_free_authdata(ctx, inner_ad); | ||
| return; | ||
| } | ||
|
|
||
| printf("%c", prefix_byte); | ||
| printf("%d: ", (int)ad->ad_type); | ||
| display_binary_or_ascii(ad); | ||
| printf("\n"); | ||
| } | ||
|
|
||
| static void | ||
| display_authdata_list(krb5_authdata **list, krb5_keyblock *skey, | ||
| krb5_keyblock *tktkey, char prefix_byte) | ||
| { | ||
| if (list == NULL) | ||
| return; | ||
| for (; *list != NULL; list++) | ||
| display_authdata(*list, skey, tktkey, prefix_byte); | ||
| } | ||
|
|
||
| int | ||
| main(int argc, char **argv) | ||
| { | ||
| const char *ccname = NULL, *clientname = NULL; | ||
| krb5_principal client, server; | ||
| krb5_ccache ccache; | ||
| krb5_keytab keytab; | ||
| krb5_creds in_creds, *creds; | ||
| krb5_ticket *ticket; | ||
| krb5_authdata **req_authdata = NULL, *ad; | ||
| krb5_keytab_entry ktent; | ||
| size_t count; | ||
| int c; | ||
|
|
||
| check(krb5_init_context(&ctx)); | ||
|
|
||
| while ((c = getopt(argc, argv, "+c:p:")) != -1) { | ||
| switch (c) { | ||
| case 'c': | ||
| ccname = optarg; | ||
| break; | ||
| case 'p': | ||
| clientname = optarg; | ||
| break; | ||
| default: | ||
| abort(); | ||
| } | ||
| } | ||
| argv += optind; | ||
| /* Parse arguments. */ | ||
| assert(*argv != NULL); | ||
| check(krb5_parse_name(ctx, *argv++, &server)); | ||
|
|
||
| count = 0; | ||
| for (; argv[0] != NULL && argv[1] != NULL; argv += 2) { | ||
| ad = make_authdata(argv[0], argv[1]); | ||
| req_authdata = realloc(req_authdata, | ||
| (count + 2) * sizeof(*req_authdata)); | ||
| assert(req_authdata != NULL); | ||
| req_authdata[count++] = ad; | ||
| req_authdata[count] = NULL; | ||
| } | ||
| assert(*argv == NULL); | ||
|
|
||
| if (ccname != NULL) | ||
| check(krb5_cc_resolve(ctx, ccname, &ccache)); | ||
| else | ||
| check(krb5_cc_default(ctx, &ccache)); | ||
|
|
||
| if (clientname != NULL) | ||
| check(krb5_parse_name(ctx, clientname, &client)); | ||
| else | ||
| check(krb5_cc_get_principal(ctx, ccache, &client)); | ||
|
|
||
| memset(&in_creds, 0, sizeof(in_creds)); | ||
| in_creds.client = client; | ||
| in_creds.server = server; | ||
| in_creds.authdata = req_authdata; | ||
|
|
||
| check(krb5_get_credentials(ctx, KRB5_GC_NO_STORE, ccache, &in_creds, | ||
| &creds)); | ||
|
|
||
| check(krb5_decode_ticket(&creds->ticket, &ticket)); | ||
| check(krb5_kt_default(ctx, &keytab)); | ||
| check(krb5_kt_get_entry(ctx, keytab, server, ticket->enc_part.kvno, | ||
| ticket->enc_part.enctype, &ktent)); | ||
| check(krb5_decrypt_tkt_part(ctx, &ktent.key, ticket)); | ||
|
|
||
| display_authdata_list(ticket->enc_part2->authorization_data, | ||
| ticket->enc_part2->session, &ktent.key, ' '); | ||
|
|
||
| while (count > 0) { | ||
| free(req_authdata[--count]->contents); | ||
| free(req_authdata[count]); | ||
| } | ||
| free(req_authdata); | ||
| krb5_free_keytab_entry_contents(ctx, &ktent); | ||
| krb5_free_creds(ctx, creds); | ||
| krb5_free_ticket(ctx, ticket); | ||
| krb5_free_principal(ctx, client); | ||
| krb5_free_principal(ctx, server); | ||
| krb5_cc_close(ctx, ccache); | ||
| krb5_kt_close(ctx, keytab); | ||
| krb5_free_context(ctx); | ||
| return 0; | ||
| } |
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