diff options
Diffstat (limited to 'src/lib/krb5/krb/preauth_pkinit.c')
| -rw-r--r-- | src/lib/krb5/krb/preauth_pkinit.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/src/lib/krb5/krb/preauth_pkinit.c b/src/lib/krb5/krb/preauth_pkinit.c new file mode 100644 index 0000000000..02810f2bef --- /dev/null +++ b/src/lib/krb5/krb/preauth_pkinit.c @@ -0,0 +1,204 @@ +/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */ +/* lib/krb5/krb/preauth_pkinit.c - PKINIT clpreauth helpers */ +/* + * Copyright 2013 Red Hat, Inc. 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. + * + * 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 OWNER + * 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. + */ + +/* + * This file defines libkrb5 APIs for manipulating PKINIT responder questions + * and answers. The main body of the PKINIT clpreauth module is in the + * plugins/preauth/pkinit directory. + */ + +#include "k5-int.h" +#include "k5-json.h" +#include "int-proto.h" +#include "init_creds_ctx.h" + +struct get_one_challenge_data { + krb5_responder_pkinit_identity **identities; + krb5_error_code err; +}; + +static void +get_one_challenge(void *arg, const char *key, k5_json_value val) +{ + struct get_one_challenge_data *data; + unsigned long token_flags; + int i; + + data = arg; + if (data->err != 0) + return; + if (k5_json_get_tid(val) != K5_JSON_TID_NUMBER) { + data->err = EINVAL; + return; + } + + token_flags = k5_json_number_value(val); + /* Find the slot for this entry. */ + for (i = 0; data->identities[i] != NULL; i++) + continue; + /* Set the identity (a copy of the key) and the token flags. */ + data->identities[i] = k5alloc(sizeof(*data->identities[i]), &data->err); + if (data->identities[i] == NULL) + return; + data->identities[i]->identity = strdup(key); + if (data->identities[i]->identity == NULL) { + data->err = ENOMEM; + return; + } + data->identities[i]->token_flags = token_flags; +} + +krb5_error_code KRB5_CALLCONV +krb5_responder_pkinit_get_challenge(krb5_context ctx, + krb5_responder_context rctx, + krb5_responder_pkinit_challenge **chl_out) +{ + const char *challenge; + k5_json_value j; + struct get_one_challenge_data get_one_challenge_data; + krb5_responder_pkinit_challenge *chl = NULL; + unsigned int n_ids; + krb5_error_code ret; + + *chl_out = NULL; + challenge = krb5_responder_get_challenge(ctx, rctx, + KRB5_RESPONDER_QUESTION_PKINIT); + if (challenge == NULL) + return 0; + + ret = k5_json_decode(challenge, &j); + if (ret != 0) + return ret; + + /* Create the returned object. */ + chl = k5alloc(sizeof(*chl), &ret); + if (chl == NULL) + goto failed; + + /* Create the list of identities. */ + n_ids = k5_json_object_count(j); + chl->identities = k5calloc(n_ids + 1, sizeof(chl->identities[0]), &ret); + if (chl->identities == NULL) + goto failed; + + /* Populate the object with identities. */ + memset(&get_one_challenge_data, 0, sizeof(get_one_challenge_data)); + get_one_challenge_data.identities = chl->identities; + k5_json_object_iterate(j, get_one_challenge, &get_one_challenge_data); + if (get_one_challenge_data.err != 0) { + ret = get_one_challenge_data.err; + goto failed; + } + + /* All done. */ + k5_json_release(j); + *chl_out = chl; + return 0; + +failed: + k5_json_release(j); + krb5_responder_pkinit_challenge_free(ctx, rctx, chl); + return ret; +} + +krb5_error_code KRB5_CALLCONV +krb5_responder_pkinit_set_answer(krb5_context ctx, krb5_responder_context rctx, + const char *identity, const char *pin) +{ + char *answer = NULL; + const char *old_answer; + k5_json_value answers = NULL; + k5_json_string jpin = NULL; + krb5_error_code ret = ENOMEM; + + /* If there's an answer already set, we're adding/removing a value. */ + old_answer = k5_response_items_get_answer(rctx->items, + KRB5_RESPONDER_QUESTION_PKINIT); + + /* If we're removing a value, and we have no values, we're done. */ + if (old_answer == NULL && pin == NULL) + return 0; + + /* Decode the old answers. */ + if (old_answer == NULL) + old_answer = "{}"; + ret = k5_json_decode(old_answer, &answers); + if (ret != 0) + goto cleanup; + + if (k5_json_get_tid(answers) != K5_JSON_TID_OBJECT) { + ret = EINVAL; + goto cleanup; + } + + /* Create and add the new pin string, if we're adding a value. */ + if (pin != NULL) { + ret = k5_json_string_create(pin, &jpin); + if (ret != 0) + goto cleanup; + ret = k5_json_object_set(answers, identity, jpin); + if (ret != 0) + goto cleanup; + } else { + ret = k5_json_object_set(answers, identity, NULL); + if (ret != 0) + goto cleanup; + } + + /* Encode and we're done. */ + ret = k5_json_encode(answers, &answer); + if (ret != 0) + goto cleanup; + + ret = krb5_responder_set_answer(ctx, rctx, KRB5_RESPONDER_QUESTION_PKINIT, + answer); + +cleanup: + k5_json_release(jpin); + k5_json_release(answers); + free(answer); + return ret; +} + +void KRB5_CALLCONV +krb5_responder_pkinit_challenge_free(krb5_context ctx, + krb5_responder_context rctx, + krb5_responder_pkinit_challenge *chl) +{ + unsigned int i; + + if (chl == NULL) + return; + for (i = 0; chl->identities != NULL && chl->identities[i] != NULL; i++) { + free(chl->identities[i]->identity); + free(chl->identities[i]); + } + free(chl->identities); + free(chl); +} |