/*
* Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Portions Copyright (c) 2009 Apple 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.
*
* 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"
typedef struct krb5_get_init_creds_ctx {
KDCOptions flags;
krb5_creds cred;
krb5_addresses *addrs;
krb5_enctype *etypes;
krb5_preauthtype *pre_auth_types;
char *in_tkt_service;
unsigned nonce;
unsigned pk_nonce;
krb5_data req_buffer;
AS_REQ as_req;
int pa_counter;
/* password and keytab_data is freed on completion */
char *password;
krb5_keytab_key_proc_args *keytab_data;
krb5_pointer *keyseed;
krb5_s2k_proc keyproc;
krb5_get_init_creds_tristate req_pac;
krb5_pk_init_ctx pk_init_ctx;
int ic_flags;
int used_pa_types;
#define USED_PKINIT 1
#define USED_PKINIT_W2K 2
#define USED_ENC_TS_GUESS 4
#define USED_ENC_TS_INFO 8
METHOD_DATA md;
KRB_ERROR error;
AS_REP as_rep;
EncKDCRepPart enc_part;
krb5_prompter_fct prompter;
void *prompter_data;
struct pa_info_data *ppaid;
} krb5_get_init_creds_ctx;
struct pa_info_data {
krb5_enctype etype;
krb5_salt salt;
krb5_data *s2kparams;
};
static void
free_paid(krb5_context context, struct pa_info_data *ppaid)
{
krb5_free_salt(context, ppaid->salt);
if (ppaid->s2kparams)
krb5_free_data(context, ppaid->s2kparams);
}
static krb5_error_code KRB5_CALLCONV
default_s2k_func(krb5_context context, krb5_enctype type,
krb5_const_pointer keyseed,
krb5_salt salt, krb5_data *s2kparms,
krb5_keyblock **key)
{
krb5_error_code ret;
krb5_data password;
krb5_data opaque;
_krb5_debug(context, 5, "krb5_get_init_creds: using default_s2k_func");
password.data = rk_UNCONST(keyseed);
password.length = strlen(keyseed);
if (s2kparms)
opaque = *s2kparms;
else
krb5_data_zero(&opaque);
*key = malloc(sizeof(**key));
if (*key == NULL)
return ENOMEM;
ret = krb5_string_to_key_data_salt_opaque(context, type, password,
salt, opaque, *key);
if (ret) {
free(*key);
*key = NULL;
}
return ret;
}
static void
free_init_creds_ctx(krb5_context context, krb5_init_creds_context ctx)
{
if (ctx->etypes)
free(ctx->etypes);
if (ctx->pre_auth_types)
free (ctx->pre_auth_types);
if (ctx->in_tkt_service)
free(ctx->in_tkt_service);
if (ctx->keytab_data)
free(ctx->keytab_data);
if (ctx->password) {
memset(ctx->password, 0, strlen(ctx->password));
free(ctx->password);
}
krb5_data_free(&ctx->req_buffer);
krb5_free_cred_contents(context, &ctx->cred);
free_METHOD_DATA(&ctx->md);
free_AS_REP(&ctx->as_rep);
free_EncKDCRepPart(&ctx->enc_part);
free_KRB_ERROR(&ctx->error);
free_AS_REQ(&ctx->as_req);
if (ctx->ppaid) {
free_paid(context, ctx->ppaid);
free(ctx->ppaid);
}
memset(ctx, 0, sizeof(*ctx));
}
static int
get_config_time (krb5_context context,
const char *realm,
const char *name,
int def)
{
int ret;
ret = krb5_config_get_time (context, NULL,
"realms",
realm,
name,
NULL);
if (ret >= 0)
return ret;
ret = krb5_config_get_time (context, NULL,
"libdefaults",
name,
NULL);
if (ret >= 0)
return ret;
return def;
}
static krb5_error_code
init_cred (krb5_context context,
krb5_creds *cred,
krb5_principal client,
krb5_deltat start_time,
krb5_get_init_creds_opt *options)
{
krb5_error_code ret;
int tmp;
krb5_timestamp now;
krb5_timeofday (context, &now);
memset (cred, 0, sizeof(*cred));
if (client)
krb5_copy_principal(context, client, &cred->client);
else {
ret = krb5_get_default_principal (context,
&cred->client);
if (ret)
goto out;
}
if (start_time)
cred->times.starttime = now + start_time;
if (options->flags & KRB5_GET_INIT_CREDS_OPT_TKT_LIFE)
tmp = options->tkt_life;
else
tmp = 10 * 60 * 60;
cred->times.endtime = now + tmp;
if ((options->flags & KRB5_GET_INIT_CREDS_OPT_RENEW_LIFE) &&
options->renew_life > 0) {
cred->times.renew_till = now + options->renew_life;
}
return 0;
out:
krb5_free_cred_contents (context, cred);
return ret;
}
/*
* Print a message (str) to the user about the expiration in `lr'
*/
static void
report_expiration (krb5_context context,
krb5_prompter_fct prompter,
krb5_data *data,
const char *str,
time_t now)
{
char *p = NULL;
if (asprintf(&p, "%s%s", str, ctime(&now)) < 0 || p == NULL)
return;
(*prompter)(context, data, NULL, p, 0, NULL);
free(p);
}
/*
* Check the context, and in the case there is a expiration warning,
* use the prompter to print the warning.
*
* @param context A Kerberos 5 context.
* @param options An GIC options structure
* @param ctx The krb5_init_creds_context check for expiration.
*/
static krb5_error_code
process_last_request(krb5_context context,
krb5_get_init_creds_opt *options,
krb5_init_creds_context ctx)
{
krb5_const_realm realm;
LastReq *lr;
krb5_boolean reported = FALSE;
krb5_timestamp sec;
time_t t;
size_t i;
/*
* First check if there is a API consumer.
*/
realm = krb5_principal_get_realm (context, ctx->cred.client);
lr = &ctx->enc_part.last_req;
if (options && options->opt_private && options->opt_private->lr.func) {
krb5_last_req_entry **lre;
lre = calloc(lr->len + 1, sizeof(**lre));
if (lre == NULL) {
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
}
for (i = 0; i < lr->len; i++) {
lre[i] = calloc(1, sizeof(*lre[i]));
if (lre[i] == NULL)
break;
lre[i]->lr_type = lr->val[i].lr_type;
lre[i]->value = lr->val[i].lr_value;
}
(*options->opt_private->lr.func)(context, lre,
options->opt_private->lr.ctx);
for (i = 0; i < lr->len; i++)
free(lre[i]);
free(lre);
}
/*
* Now check if we should prompt the user
*/
if (ctx->prompter == NULL)
return 0;
krb5_timeofday (context, &sec);
t = sec + get_config_time (context,
realm,
"warn_pwexpire",
7 * 24 * 60 * 60);
for (i = 0; i < lr->len; ++i) {
if (lr->val[i].lr_value <= t) {
switch (abs(lr->val[i].lr_type)) {
case LR_PW_EXPTIME :
report_expiration(context, ctx->prompter,
ctx->prompter_data,
"Your password will expire at ",
lr->val[i].lr_value);
reported = TRUE;
break;
case LR_ACCT_EXPTIME :
report_expiration(context, ctx->prompter,
ctx->prompter_data,
"Your account will expire at ",
lr->val[i].lr_value);
reported = TRUE;
break;
}
}
}
if (!reported
&& ctx->enc_part.key_expiration
&& *ctx->enc_part.key_expiration <= t) {
report_expiration(context, ctx->prompter,
ctx->prompter_data,
"Your password/account will expire at ",
*ctx->enc_part.key_expiration);
}
return 0;
}
static krb5_addresses no_addrs = { 0, NULL };
static krb5_error_code
get_init_creds_common(krb5_context context,
krb5_principal client,
krb5_deltat start_time,
krb5_get_init_creds_opt *options,
krb5_init_creds_context ctx)
{
krb5_get_init_creds_opt *default_opt = NULL;
krb5_error_code ret;
krb5_enctype *etypes;
krb5_preauthtype *pre_auth_types;
memset(ctx, 0, sizeof(*ctx));
if (options == NULL) {
const char *realm = krb5_principal_get_realm(context, client);
krb5_get_init_creds_opt_alloc (context, &default_opt);
options = default_opt;
krb5_get_init_creds_opt_set_default_flags(context, NULL, realm, options);
}
if (options->opt_private) {
if (options->opt_private->password) {
ret = krb5_init_creds_set_password(context, ctx,
options->opt_private->password);
if (ret)
goto out;
}
ctx->keyproc = options->opt_private->key_proc;
ctx->req_pac = options->opt_private->req_pac;
ctx->pk_init_ctx = options->opt_private->pk_init_ctx;
ctx->ic_flags = options->opt_private->flags;
} else
ctx->req_pac = KRB5_INIT_CREDS_TRISTATE_UNSET;
if (ctx->keyproc == NULL)
ctx->keyproc = default_s2k_func;
/* Enterprise name implicitly turns on canonicalize */
if ((ctx->ic_flags & KRB5_INIT_CREDS_CANONICALIZE) ||
krb5_principal_get_type(context, client) == KRB5_NT_ENTERPRISE_PRINCIPAL)
ctx->flags.canonicalize = 1;
ctx->pre_auth_types = NULL;
ctx->addrs = NULL;
ctx->etypes = NULL;
ctx->pre_auth_types = NULL;
ret = init_cred(context, &ctx->cred, client, start_time, options);
if (ret) {
if (default_opt)
krb5_get_init_creds_opt_free(context, default_opt);
return ret;
}
ret = krb5_init_creds_set_service(context, ctx, NULL);
if (ret)
goto out;
if (options->flags & KRB5_GET_INIT_CREDS_OPT_FORWARDABLE)
ctx->flags.forwardable = options->forwardable;
if (options->flags & KRB5_GET_INIT_CREDS_OPT_PROXIABLE)
ctx->flags.proxiable = options->proxiable;
if (start_time)
ctx->flags.postdated = 1;
if (ctx->cred.times.renew_till)
ctx->flags.renewable = 1;
if (options->flags & KRB5_GET_INIT_CREDS_OPT_ADDRESS_LIST) {
ctx->addrs = options->address_list;
} else if (options->opt_private) {
switch (options->opt_private->addressless) {
case KRB5_INIT_CREDS_TRISTATE_UNSET:
#if KRB5_ADDRESSLESS_DEFAULT == TRUE
ctx->addrs = &no_addrs;
#else
ctx->addrs = NULL;
#endif
break;
case KRB5_INIT_CREDS_TRISTATE_FALSE:
ctx->addrs = NULL;
break;
case KRB5_INIT_CREDS_TRISTATE_TRUE:
ctx->addrs = &no_addrs;
break;
}
}
if (options->flags & KRB5_GET_INIT_CREDS_OPT_ETYPE_LIST) {
if (ctx->etypes)
free(ctx->etypes);
etypes = malloc((options->etype_list_length + 1)
* sizeof(krb5_enctype));
if (etypes == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
goto out;
}
memcpy (etypes, options->etype_list,
options->etype_list_length * sizeof(krb5_enctype));
etypes[options->etype_list_length] = ETYPE_NULL;
ctx->etypes = etypes;
}
if (options->flags & KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST) {
pre_auth_types = malloc((options->preauth_list_length + 1)
* sizeof(krb5_preauthtype));
if (pre_auth_types == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
goto out;
}
memcpy (pre_auth_types, options->preauth_list,
options->preauth_list_length * sizeof(krb5_preauthtype));
pre_auth_types[options->preauth_list_length] = KRB5_PADATA_NONE;
ctx->pre_auth_types = pre_auth_types;
}
if (options->flags & KRB5_GET_INIT_CREDS_OPT_ANONYMOUS)
ctx->flags.request_anonymous = options->anonymous;
if (default_opt)
krb5_get_init_creds_opt_free(context, default_opt);
return 0;
out:
if (default_opt)
krb5_get_init_creds_opt_free(context, default_opt);
return ret;
}
static krb5_error_code
change_password (krb5_context context,
krb5_principal client,
const char *password,
char *newpw,
size_t newpw_sz,
krb5_prompter_fct prompter,
void *data,
krb5_get_init_creds_opt *old_options)
{
krb5_prompt prompts[2];
krb5_error_code ret;
krb5_creds cpw_cred;
char buf1[BUFSIZ], buf2[BUFSIZ];
krb5_data password_data[2];
int result_code;
krb5_data result_code_string;
krb5_data result_string;
char *p;
krb5_get_init_creds_opt *options;
memset (&cpw_cred, 0, sizeof(cpw_cred));
ret = krb5_get_init_creds_opt_alloc(context, &options);
if (ret)
return ret;
krb5_get_init_creds_opt_set_tkt_life (options, 60);
krb5_get_init_creds_opt_set_forwardable (options, FALSE);
krb5_get_init_creds_opt_set_proxiable (options, FALSE);
if (old_options && old_options->flags & KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST)
krb5_get_init_creds_opt_set_preauth_list (options,
old_options->preauth_list,
old_options->preauth_list_length);
krb5_data_zero (&result_code_string);
krb5_data_zero (&result_string);
ret = krb5_get_init_creds_password (context,
&cpw_cred,
client,
password,
prompter,
data,
0,
"kadmin/changepw",
options);
krb5_get_init_creds_opt_free(context, options);
if (ret)
goto out;
for(;;) {
password_data[0].data = buf1;
password_data[0].length = sizeof(buf1);
prompts[0].hidden = 1;
prompts[0].prompt = "New password: ";
prompts[0].reply = &password_data[0];
prompts[0].type = KRB5_PROMPT_TYPE_NEW_PASSWORD;
password_data[1].data = buf2;
password_data[1].length = sizeof(buf2);
prompts[1].hidden = 1;
prompts[1].prompt = "Repeat new password: ";
prompts[1].reply = &password_data[1];
prompts[1].type = KRB5_PROMPT_TYPE_NEW_PASSWORD_AGAIN;
ret = (*prompter) (context, data, NULL, "Changing password",
2, prompts);
if (ret) {
memset (buf1, 0, sizeof(buf1));
memset (buf2, 0, sizeof(buf2));
goto out;
}
if (strcmp (buf1, buf2) == 0)
break;
memset (buf1, 0, sizeof(buf1));
memset (buf2, 0, sizeof(buf2));
}
ret = krb5_set_password (context,
&cpw_cred,
buf1,
client,
&result_code,
&result_code_string,
&result_string);
if (ret)
goto out;
if (asprintf(&p, "%s: %.*s\n",
result_code ? "Error" : "Success",
(int)result_string.length,
result_string.length > 0 ? (char*)result_string.data : "") < 0)
{
ret = ENOMEM;
goto out;
}
/* return the result */
(*prompter) (context, data, NULL, p, 0, NULL);
free (p);
if (result_code == 0) {
strlcpy (newpw, buf1, newpw_sz);
ret = 0;
} else {
ret = ENOTTY;
krb5_set_error_message(context, ret,
N_("failed changing password", ""));
}
out:
memset (buf1, 0, sizeof(buf1));
memset (buf2, 0, sizeof(buf2));
krb5_data_free (&result_string);
krb5_data_free (&result_code_string);
krb5_free_cred_contents (context, &cpw_cred);
return ret;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_keyblock_key_proc (krb5_context context,
krb5_keytype type,
krb5_data *salt,
krb5_const_pointer keyseed,
krb5_keyblock **key)
{
return krb5_copy_keyblock (context, keyseed, key);
}
/*
*
*/
static krb5_error_code
init_as_req (krb5_context context,
KDCOptions opts,
const krb5_creds *creds,
const krb5_addresses *addrs,
const krb5_enctype *etypes,
AS_REQ *a)
{
krb5_error_code ret;
memset(a, 0, sizeof(*a));
a->pvno = 5;
a->msg_type = krb_as_req;
a->req_body.kdc_options = opts;
a->req_body.cname = malloc(sizeof(*a->req_body.cname));
if (a->req_body.cname == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
goto fail;
}
a->req_body.sname = malloc(sizeof(*a->req_body.sname));
if (a->req_body.sname == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
goto fail;
}
ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
if (ret)
goto fail;
ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
if (ret)
goto fail;
ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
if (ret)
goto fail;
if(creds->times.starttime) {
a->req_body.from = malloc(sizeof(*a->req_body.from));
if (a->req_body.from == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
goto fail;
}
*a->req_body.from = creds->times.starttime;
}
if(creds->times.endtime){
ALLOC(a->req_body.till, 1);
*a->req_body.till = creds->times.endtime;
}
if(creds->times.renew_till){
a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
if (a->req_body.rtime == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
goto fail;
}
*a->req_body.rtime = creds->times.renew_till;
}
a->req_body.nonce = 0;
ret = _krb5_init_etype(context,
KRB5_PDU_AS_REQUEST,
&a->req_body.etype.len,
&a->req_body.etype.val,
etypes);
if (ret)
goto fail;
/*
* This means no addresses
*/
if (addrs && addrs->len == 0) {
a->req_body.addresses = NULL;
} else {
a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
if (a->req_body.addresses == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
goto fail;
}
if (addrs)
ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
else {
ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
if(ret == 0 && a->req_body.addresses->len == 0) {
free(a->req_body.addresses);
a->req_body.addresses = NULL;
}
}
if (ret)
goto fail;
}
a->req_body.enc_authorization_data = NULL;
a->req_body.additional_tickets = NULL;
a->padata = NULL;
return 0;
fail:
free_AS_REQ(a);
memset(a, 0, sizeof(*a));
return ret;
}
static krb5_error_code
set_paid(struct pa_info_data *paid, krb5_context context,
krb5_enctype etype,
krb5_salttype salttype, void *salt_string, size_t salt_len,
krb5_data *s2kparams)
{
paid->etype = etype;
paid->salt.salttype = salttype;
paid->salt.saltvalue.data = malloc(salt_len + 1);
if (paid->salt.saltvalue.data == NULL) {
krb5_clear_error_message(context);
return ENOMEM;
}
memcpy(paid->salt.saltvalue.data, salt_string, salt_len);
((char *)paid->salt.saltvalue.data)[salt_len] = '\0';
paid->salt.saltvalue.length = salt_len;
if (s2kparams) {
krb5_error_code ret;
ret = krb5_copy_data(context, s2kparams, &paid->s2kparams);
if (ret) {
krb5_clear_error_message(context);
krb5_free_salt(context, paid->salt);
return ret;
}
} else
paid->s2kparams = NULL;
return 0;
}
static struct pa_info_data *
pa_etype_info2(krb5_context context,
const krb5_principal client,
const AS_REQ *asreq,
struct pa_info_data *paid,
heim_octet_string *data)
{
krb5_error_code ret;
ETYPE_INFO2 e;
size_t sz;
size_t i, j;
memset(&e, 0, sizeof(e));
ret = decode_ETYPE_INFO2(data->data, data->length, &e, &sz);
if (ret)
goto out;
if (e.len == 0)
goto out;
for (j = 0; j < asreq->req_body.etype.len; j++) {
for (i = 0; i < e.len; i++) {
if (asreq->req_body.etype.val[j] == e.val[i].etype) {
krb5_salt salt;
if (e.val[i].salt == NULL)
ret = krb5_get_pw_salt(context, client, &salt);
else {
salt.saltvalue.data = *e.val[i].salt;
salt.saltvalue.length = strlen(*e.val[i].salt);
ret = 0;
}
if (ret == 0)
ret = set_paid(paid, context, e.val[i].etype,
KRB5_PW_SALT,
salt.saltvalue.data,
salt.saltvalue.length,
e.val[i].s2kparams);
if (e.val[i].salt == NULL)
krb5_free_salt(context, salt);
if (ret == 0) {
free_ETYPE_INFO2(&e);
return paid;
}
}
}
}
out:
free_ETYPE_INFO2(&e);
return NULL;
}
static struct pa_info_data *
pa_etype_info(krb5_context context,
const krb5_principal client,
const AS_REQ *asreq,
struct pa_info_data *paid,
heim_octet_string *data)
{
krb5_error_code ret;
ETYPE_INFO e;
size_t sz;
size_t i, j;
memset(&e, 0, sizeof(e));
ret = decode_ETYPE_INFO(data->data, data->length, &e, &sz);
if (ret)
goto out;
if (e.len == 0)
goto out;
for (j = 0; j < asreq->req_body.etype.len; j++) {
for (i = 0; i < e.len; i++) {
if (asreq->req_body.etype.val[j] == e.val[i].etype) {
krb5_salt salt;
salt.salttype = KRB5_PW_SALT;
if (e.val[i].salt == NULL)
ret = krb5_get_pw_salt(context, client, &salt);
else {
salt.saltvalue = *e.val[i].salt;
ret = 0;
}
if (e.val[i].salttype)
salt.salttype = *e.val[i].salttype;
if (ret == 0) {
ret = set_paid(paid, context, e.val[i].etype,
salt.salttype,
salt.saltvalue.data,
salt.saltvalue.length,
NULL);
if (e.val[i].salt == NULL)
krb5_free_salt(context, salt);
}
if (ret == 0) {
free_ETYPE_INFO(&e);
return paid;
}
}
}
}
out:
free_ETYPE_INFO(&e);
return NULL;
}
static struct pa_info_data *
pa_pw_or_afs3_salt(krb5_context context,
const krb5_principal client,
const AS_REQ *asreq,
struct pa_info_data *paid,
heim_octet_string *data)
{
krb5_error_code ret;
if (paid->etype == ENCTYPE_NULL)
return NULL;
ret = set_paid(paid, context,
paid->etype,
paid->salt.salttype,
data->data,
data->length,
NULL);
if (ret)
return NULL;
return paid;
}
struct pa_info {
krb5_preauthtype type;
struct pa_info_data *(*salt_info)(krb5_context,
const krb5_principal,
const AS_REQ *,
struct pa_info_data *,
heim_octet_string *);
};
static struct pa_info pa_prefs[] = {
{ KRB5_PADATA_ETYPE_INFO2, pa_etype_info2 },
{ KRB5_PADATA_ETYPE_INFO, pa_etype_info },
{ KRB5_PADATA_PW_SALT, pa_pw_or_afs3_salt },
{ KRB5_PADATA_AFS3_SALT, pa_pw_or_afs3_salt }
};
static PA_DATA *
find_pa_data(const METHOD_DATA *md, unsigned type)
{
size_t i;
if (md == NULL)
return NULL;
for (i = 0; i < md->len; i++)
if (md->val[i].padata_type == type)
return &md->val[i];
return NULL;
}
static struct pa_info_data *
process_pa_info(krb5_context context,
const krb5_principal client,
const AS_REQ *asreq,
struct pa_info_data *paid,
METHOD_DATA *md)
{
struct pa_info_data *p = NULL;
size_t i;
for (i = 0; p == NULL && i < sizeof(pa_prefs)/sizeof(pa_prefs[0]); i++) {
PA_DATA *pa = find_pa_data(md, pa_prefs[i].type);
if (pa == NULL)
continue;
paid->salt.salttype = (krb5_salttype)pa_prefs[i].type;
p = (*pa_prefs[i].salt_info)(context, client, asreq,
paid, &pa->padata_value);
}
return p;
}
static krb5_error_code
make_pa_enc_timestamp(krb5_context context, METHOD_DATA *md,
krb5_enctype etype, krb5_keyblock *key)
{
PA_ENC_TS_ENC p;
unsigned char *buf;
size_t buf_size;
size_t len = 0;
EncryptedData encdata;
krb5_error_code ret;
int32_t usec;
int usec2;
krb5_crypto crypto;
krb5_us_timeofday (context, &p.patimestamp, &usec);
usec2 = usec;
p.pausec = &usec2;
ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
if (ret)
return ret;
if(buf_size != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
ret = krb5_crypto_init(context, key, 0, &crypto);
if (ret) {
free(buf);
return ret;
}
ret = krb5_encrypt_EncryptedData(context,
crypto,
KRB5_KU_PA_ENC_TIMESTAMP,
buf,
len,
0,
&encdata);
free(buf);
krb5_crypto_destroy(context, crypto);
if (ret)
return ret;
ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
free_EncryptedData(&encdata);
if (ret)
return ret;
if(buf_size != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
ret = krb5_padata_add(context, md, KRB5_PADATA_ENC_TIMESTAMP, buf, len);
if (ret)
free(buf);
return ret;
}
static krb5_error_code
add_enc_ts_padata(krb5_context context,
METHOD_DATA *md,
krb5_principal client,
krb5_s2k_proc keyproc,
krb5_const_pointer keyseed,
krb5_enctype *enctypes,
unsigned netypes,
krb5_salt *salt,
krb5_data *s2kparams)
{
krb5_error_code ret;
krb5_salt salt2;
krb5_enctype *ep;
size_t i;
if(salt == NULL) {
/* default to standard salt */
ret = krb5_get_pw_salt (context, client, &salt2);
if (ret)
return ret;
salt = &salt2;
}
if (!enctypes) {
enctypes = context->etypes;
netypes = 0;
for (ep = enctypes; *ep != ETYPE_NULL; ep++)
netypes++;
}
for (i = 0; i < netypes; ++i) {
krb5_keyblock *key;
_krb5_debug(context, 5, "krb5_get_init_creds: using ENC-TS with enctype %d", enctypes[i]);
ret = (*keyproc)(context, enctypes[i], keyseed,
*salt, s2kparams, &key);
if (ret)
continue;
ret = make_pa_enc_timestamp (context, md, enctypes[i], key);
krb5_free_keyblock (context, key);
if (ret)
return ret;
}
if(salt == &salt2)
krb5_free_salt(context, salt2);
return 0;
}
static krb5_error_code
pa_data_to_md_ts_enc(krb5_context context,
const AS_REQ *a,
const krb5_principal client,
krb5_get_init_creds_ctx *ctx,
struct pa_info_data *ppaid,
METHOD_DATA *md)
{
if (ctx->keyproc == NULL || ctx->keyseed == NULL)
return 0;
if (ppaid) {
add_enc_ts_padata(context, md, client,
ctx->keyproc, ctx->keyseed,
&ppaid->etype, 1,
&ppaid->salt, ppaid->s2kparams);
} else {
krb5_salt salt;
_krb5_debug(context, 5, "krb5_get_init_creds: pa-info not found, guessing salt");
/* make a v5 salted pa-data */
add_enc_ts_padata(context, md, client,
ctx->keyproc, ctx->keyseed,
a->req_body.etype.val, a->req_body.etype.len,
NULL, NULL);
/* make a v4 salted pa-data */
salt.salttype = KRB5_PW_SALT;
krb5_data_zero(&salt.saltvalue);
add_enc_ts_padata(context, md, client,
ctx->keyproc, ctx->keyseed,
a->req_body.etype.val, a->req_body.etype.len,
&salt, NULL);
}
return 0;
}
static krb5_error_code
pa_data_to_key_plain(krb5_context context,
const krb5_principal client,
krb5_get_init_creds_ctx *ctx,
krb5_salt salt,
krb5_data *s2kparams,
krb5_enctype etype,
krb5_keyblock **key)
{
krb5_error_code ret;
ret = (*ctx->keyproc)(context, etype, ctx->keyseed,
salt, s2kparams, key);
return ret;
}
static krb5_error_code
pa_data_to_md_pkinit(krb5_context context,
const AS_REQ *a,
const krb5_principal client,
int win2k,
krb5_get_init_creds_ctx *ctx,
METHOD_DATA *md)
{
if (ctx->pk_init_ctx == NULL)
return 0;
#ifdef PKINIT
return _krb5_pk_mk_padata(context,
ctx->pk_init_ctx,
ctx->ic_flags,
win2k,
&a->req_body,
ctx->pk_nonce,
md);
#else
krb5_set_error_message(context, EINVAL,
N_("no support for PKINIT compiled in", ""));
return EINVAL;
#endif
}
static krb5_error_code
pa_data_add_pac_request(krb5_context context,
krb5_get_init_creds_ctx *ctx,
METHOD_DATA *md)
{
size_t len = 0, length;
krb5_error_code ret;
PA_PAC_REQUEST req;
void *buf;
switch (ctx->req_pac) {
case KRB5_INIT_CREDS_TRISTATE_UNSET:
return 0; /* don't bother */
case KRB5_INIT_CREDS_TRISTATE_TRUE:
req.include_pac = 1;
break;
case KRB5_INIT_CREDS_TRISTATE_FALSE:
req.include_pac = 0;
}
ASN1_MALLOC_ENCODE(PA_PAC_REQUEST, buf, length,
&req, &len, ret);
if (ret)
return ret;
if(len != length)
krb5_abortx(context, "internal error in ASN.1 encoder");
ret = krb5_padata_add(context, md, KRB5_PADATA_PA_PAC_REQUEST, buf, len);
if (ret)
free(buf);
return 0;
}
/*
* Assumes caller always will free `out_md', even on error.
*/
static krb5_error_code
process_pa_data_to_md(krb5_context context,
const krb5_creds *creds,
const AS_REQ *a,
krb5_get_init_creds_ctx *ctx,
METHOD_DATA *in_md,
METHOD_DATA **out_md,
krb5_prompter_fct prompter,
void *prompter_data)
{
krb5_error_code ret;
ALLOC(*out_md, 1);
if (*out_md == NULL) {
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
(*out_md)->len = 0;
(*out_md)->val = NULL;
if (_krb5_have_debug(context, 5)) {
unsigned i;
_krb5_debug(context, 5, "KDC send %d patypes", in_md->len);
for (i = 0; i < in_md->len; i++)
_krb5_debug(context, 5, "KDC send PA-DATA type: %d", in_md->val[i].padata_type);
}
/*
* Make sure we don't sent both ENC-TS and PK-INIT pa data, no
* need to expose our password protecting our PKCS12 key.
*/
if (ctx->pk_init_ctx) {
_krb5_debug(context, 5, "krb5_get_init_creds: "
"prepareing PKINIT padata (%s)",
(ctx->used_pa_types & USED_PKINIT_W2K) ? "win2k" : "ietf");
if (ctx->used_pa_types & USED_PKINIT_W2K) {
krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
"Already tried pkinit, looping");
return KRB5_GET_IN_TKT_LOOP;
}
ret = pa_data_to_md_pkinit(context, a, creds->client,
(ctx->used_pa_types & USED_PKINIT),
ctx, *out_md);
if (ret)
return ret;
if (ctx->used_pa_types & USED_PKINIT)
ctx->used_pa_types |= USED_PKINIT_W2K;
else
ctx->used_pa_types |= USED_PKINIT;
} else if (in_md->len != 0) {
struct pa_info_data *paid, *ppaid;
unsigned flag;
paid = calloc(1, sizeof(*paid));
paid->etype = ENCTYPE_NULL;
ppaid = process_pa_info(context, creds->client, a, paid, in_md);
if (ppaid)
flag = USED_ENC_TS_INFO;
else
flag = USED_ENC_TS_GUESS;
if (ctx->used_pa_types & flag) {
if (ppaid)
free_paid(context, ppaid);
krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
"Already tried ENC-TS-%s, looping",
flag == USED_ENC_TS_INFO ? "info" : "guess");
return KRB5_GET_IN_TKT_LOOP;
}
pa_data_to_md_ts_enc(context, a, creds->client, ctx, ppaid, *out_md);
ctx->used_pa_types |= flag;
if (ppaid) {
if (ctx->ppaid) {
free_paid(context, ctx->ppaid);
free(ctx->ppaid);
}
ctx->ppaid = ppaid;
} else
free(paid);
}
pa_data_add_pac_request(context, ctx, *out_md);
if ((*out_md)->len == 0) {
free(*out_md);
*out_md = NULL;
}
return 0;
}
static krb5_error_code
process_pa_data_to_key(krb5_context context,
krb5_get_init_creds_ctx *ctx,
krb5_creds *creds,
AS_REQ *a,
AS_REP *rep,
const krb5_krbhst_info *hi,
krb5_keyblock **key)
{
struct pa_info_data paid, *ppaid = NULL;
krb5_error_code ret;
krb5_enctype etype;
PA_DATA *pa;
memset(&paid, 0, sizeof(paid));
etype = rep->enc_part.etype;
if (rep->padata) {
paid.etype = etype;
ppaid = process_pa_info(context, creds->client, a, &paid,
rep->padata);
}
if (ppaid == NULL)
ppaid = ctx->ppaid;
if (ppaid == NULL) {
ret = krb5_get_pw_salt (context, creds->client, &paid.salt);
if (ret)
return ret;
paid.etype = etype;
paid.s2kparams = NULL;
ppaid = &paid;
}
pa = NULL;
if (rep->padata) {
int idx = 0;
pa = krb5_find_padata(rep->padata->val,
rep->padata->len,
KRB5_PADATA_PK_AS_REP,
&idx);
if (pa == NULL) {
idx = 0;
pa = krb5_find_padata(rep->padata->val,
rep->padata->len,
KRB5_PADATA_PK_AS_REP_19,
&idx);
}
}
if (pa && ctx->pk_init_ctx) {
#ifdef PKINIT
_krb5_debug(context, 5, "krb5_get_init_creds: using PKINIT");
ret = _krb5_pk_rd_pa_reply(context,
a->req_body.realm,
ctx->pk_init_ctx,
etype,
hi,
ctx->pk_nonce,
&ctx->req_buffer,
pa,
key);
#else
ret = EINVAL;
krb5_set_error_message(context, ret, N_("no support for PKINIT compiled in", ""));
#endif
} else if (ctx->keyseed) {
_krb5_debug(context, 5, "krb5_get_init_creds: using keyproc");
ret = pa_data_to_key_plain(context, creds->client, ctx,
ppaid->salt, ppaid->s2kparams, etype, key);
} else {
ret = EINVAL;
krb5_set_error_message(context, ret, N_("No usable pa data type", ""));
}
free_paid(context, &paid);
return ret;
}
/**
* Start a new context to get a new initial credential.
*
* @param context A Kerberos 5 context.
* @param client The Kerberos principal to get the credential for, if
* NULL is given, the default principal is used as determined by
* krb5_get_default_principal().
* @param prompter
* @param prompter_data
* @param start_time the time the ticket should start to be valid or 0 for now.
* @param options a options structure, can be NULL for default options.
* @param rctx A new allocated free with krb5_init_creds_free().
*
* @return 0 for success or an Kerberos 5 error code, see krb5_get_error_message().
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_init(krb5_context context,
krb5_principal client,
krb5_prompter_fct prompter,
void *prompter_data,
krb5_deltat start_time,
krb5_get_init_creds_opt *options,
krb5_init_creds_context *rctx)
{
krb5_init_creds_context ctx;
krb5_error_code ret;
*rctx = NULL;
ctx = calloc(1, sizeof(*ctx));
if (ctx == NULL) {
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
ret = get_init_creds_common(context, client, start_time, options, ctx);
if (ret) {
free(ctx);
return ret;
}
/* Set a new nonce. */
krb5_generate_random_block (&ctx->nonce, sizeof(ctx->nonce));
ctx->nonce &= 0x7fffffff;
/* XXX these just needs to be the same when using Windows PK-INIT */
ctx->pk_nonce = ctx->nonce;
ctx->prompter = prompter;
ctx->prompter_data = prompter_data;
*rctx = ctx;
return ret;
}
/**
* Sets the service that the is requested. This call is only neede for
* special initial tickets, by default the a krbtgt is fetched in the default realm.
*
* @param context a Kerberos 5 context.
* @param ctx a krb5_init_creds_context context.
* @param service the service given as a string, for example
* "kadmind/admin". If NULL, the default krbtgt in the clients
* realm is set.
*
* @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_set_service(krb5_context context,
krb5_init_creds_context ctx,
const char *service)
{
krb5_const_realm client_realm;
krb5_principal principal;
krb5_error_code ret;
client_realm = krb5_principal_get_realm (context, ctx->cred.client);
if (service) {
ret = krb5_parse_name (context, service, &principal);
if (ret)
return ret;
krb5_principal_set_realm (context, principal, client_realm);
} else {
ret = krb5_make_principal(context, &principal,
client_realm, KRB5_TGS_NAME, client_realm,
NULL);
if (ret)
return ret;
}
/*
* This is for Windows RODC that are picky about what name type
* the server principal have, and the really strange part is that
* they are picky about the AS-REQ name type and not the TGS-REQ
* later. Oh well.
*/
if (krb5_principal_is_krbtgt(context, principal))
krb5_principal_set_type(context, principal, KRB5_NT_SRV_INST);
krb5_free_principal(context, ctx->cred.server);
ctx->cred.server = principal;
return 0;
}
/**
* Sets the password that will use for the request.
*
* @param context a Kerberos 5 context.
* @param ctx ctx krb5_init_creds_context context.
* @param password the password to use.
*
* @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_set_password(krb5_context context,
krb5_init_creds_context ctx,
const char *password)
{
if (ctx->password) {
memset(ctx->password, 0, strlen(ctx->password));
free(ctx->password);
}
if (password) {
ctx->password = strdup(password);
if (ctx->password == NULL) {
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
ctx->keyseed = (void *) ctx->password;
} else {
ctx->keyseed = NULL;
ctx->password = NULL;
}
return 0;
}
static krb5_error_code KRB5_CALLCONV
keytab_key_proc(krb5_context context, krb5_enctype enctype,
krb5_const_pointer keyseed,
krb5_salt salt, krb5_data *s2kparms,
krb5_keyblock **key)
{
krb5_keytab_key_proc_args *args = rk_UNCONST(keyseed);
krb5_keytab keytab = args->keytab;
krb5_principal principal = args->principal;
krb5_error_code ret;
krb5_keytab real_keytab;
krb5_keytab_entry entry;
if(keytab == NULL)
krb5_kt_default(context, &real_keytab);
else
real_keytab = keytab;
ret = krb5_kt_get_entry (context, real_keytab, principal,
0, enctype, &entry);
if (keytab == NULL)
krb5_kt_close (context, real_keytab);
if (ret)
return ret;
ret = krb5_copy_keyblock (context, &entry.keyblock, key);
krb5_kt_free_entry(context, &entry);
return ret;
}
/**
* Set the keytab to use for authentication.
*
* @param context a Kerberos 5 context.
* @param ctx ctx krb5_init_creds_context context.
* @param keytab the keytab to read the key from.
*
* @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_set_keytab(krb5_context context,
krb5_init_creds_context ctx,
krb5_keytab keytab)
{
krb5_keytab_key_proc_args *a;
krb5_keytab_entry entry;
krb5_kt_cursor cursor;
krb5_enctype *etypes = NULL;
krb5_error_code ret;
size_t netypes = 0;
int kvno = 0;
a = malloc(sizeof(*a));
if (a == NULL) {
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
}
a->principal = ctx->cred.client;
a->keytab = keytab;
ctx->keytab_data = a;
ctx->keyseed = (void *)a;
ctx->keyproc = keytab_key_proc;
/*
* We need to the KDC what enctypes we support for this keytab,
* esp if the keytab is really a password based entry, then the
* KDC might have more enctypes in the database then what we have
* in the keytab.
*/
ret = krb5_kt_start_seq_get(context, keytab, &cursor);
if(ret)
goto out;
while(krb5_kt_next_entry(context, keytab, &entry, &cursor) == 0){
void *ptr;
if (!krb5_principal_compare(context, entry.principal, ctx->cred.client))
goto next;
/* check if we ahve this kvno already */
if (entry.vno > kvno) {
/* remove old list of etype */
if (etypes)
free(etypes);
etypes = NULL;
netypes = 0;
kvno = entry.vno;
} else if (entry.vno != kvno)
goto next;
/* check if enctype is supported */
if (krb5_enctype_valid(context, entry.keyblock.keytype) != 0)
goto next;
/* add enctype to supported list */
ptr = realloc(etypes, sizeof(etypes[0]) * (netypes + 2));
if (ptr == NULL)
goto next;
etypes = ptr;
etypes[netypes] = entry.keyblock.keytype;
etypes[netypes + 1] = ETYPE_NULL;
netypes++;
next:
krb5_kt_free_entry(context, &entry);
}
krb5_kt_end_seq_get(context, keytab, &cursor);
if (etypes) {
if (ctx->etypes)
free(ctx->etypes);
ctx->etypes = etypes;
}
out:
return 0;
}
static krb5_error_code KRB5_CALLCONV
keyblock_key_proc(krb5_context context, krb5_enctype enctype,
krb5_const_pointer keyseed,
krb5_salt salt, krb5_data *s2kparms,
krb5_keyblock **key)
{
return krb5_copy_keyblock (context, keyseed, key);
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_set_keyblock(krb5_context context,
krb5_init_creds_context ctx,
krb5_keyblock *keyblock)
{
ctx->keyseed = (void *)keyblock;
ctx->keyproc = keyblock_key_proc;
return 0;
}
/**
* The core loop if krb5_get_init_creds() function family. Create the
* packets and have the caller send them off to the KDC.
*
* If the caller want all work been done for them, use
* krb5_init_creds_get() instead.
*
* @param context a Kerberos 5 context.
* @param ctx ctx krb5_init_creds_context context.
* @param in input data from KDC, first round it should be reset by krb5_data_zer().
* @param out reply to KDC.
* @param hostinfo KDC address info, first round it can be NULL.
* @param flags status of the round, if
* KRB5_INIT_CREDS_STEP_FLAG_CONTINUE is set, continue one more round.
*
* @return 0 for success, or an Kerberos 5 error code, see
* krb5_get_error_message().
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_step(krb5_context context,
krb5_init_creds_context ctx,
krb5_data *in,
krb5_data *out,
krb5_krbhst_info *hostinfo,
unsigned int *flags)
{
krb5_error_code ret;
size_t len = 0;
size_t size;
krb5_data_zero(out);
if (ctx->as_req.req_body.cname == NULL) {
ret = init_as_req(context, ctx->flags, &ctx->cred,
ctx->addrs, ctx->etypes, &ctx->as_req);
if (ret) {
free_init_creds_ctx(context, ctx);
return ret;
}
}
#define MAX_PA_COUNTER 10
if (ctx->pa_counter > MAX_PA_COUNTER) {
krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
N_("Looping %d times while getting "
"initial credentials", ""),
ctx->pa_counter);
return KRB5_GET_IN_TKT_LOOP;
}
ctx->pa_counter++;
_krb5_debug(context, 5, "krb5_get_init_creds: loop %d", ctx->pa_counter);
/* Lets process the input packet */
if (in && in->length) {
krb5_kdc_rep rep;
memset(&rep, 0, sizeof(rep));
_krb5_debug(context, 5, "krb5_get_init_creds: processing input");
ret = decode_AS_REP(in->data, in->length, &rep.kdc_rep, &size);
if (ret == 0) {
krb5_keyblock *key = NULL;
unsigned eflags = EXTRACT_TICKET_AS_REQ | EXTRACT_TICKET_TIMESYNC;
if (ctx->flags.canonicalize) {
eflags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
eflags |= EXTRACT_TICKET_MATCH_REALM;
}
if (ctx->ic_flags & KRB5_INIT_CREDS_NO_C_CANON_CHECK)
eflags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH;
ret = process_pa_data_to_key(context, ctx, &ctx->cred,
&ctx->as_req, &rep.kdc_rep, hostinfo, &key);
if (ret) {
free_AS_REP(&rep.kdc_rep);
goto out;
}
_krb5_debug(context, 5, "krb5_get_init_creds: extracting ticket");
ret = _krb5_extract_ticket(context,
&rep,
&ctx->cred,
key,
NULL,
KRB5_KU_AS_REP_ENC_PART,
NULL,
ctx->nonce,
eflags,
NULL,
NULL);
krb5_free_keyblock(context, key);
*flags = 0;
if (ret == 0)
ret = copy_EncKDCRepPart(&rep.enc_part, &ctx->enc_part);
free_AS_REP(&rep.kdc_rep);
free_EncASRepPart(&rep.enc_part);
return ret;
} else {
/* let's try to parse it as a KRB-ERROR */
_krb5_debug(context, 5, "krb5_get_init_creds: got an error");
free_KRB_ERROR(&ctx->error);
ret = krb5_rd_error(context, in, &ctx->error);
if(ret && in->length && ((char*)in->data)[0] == 4)
ret = KRB5KRB_AP_ERR_V4_REPLY;
if (ret) {
_krb5_debug(context, 5, "krb5_get_init_creds: failed to read error");
goto out;
}
ret = krb5_error_from_rd_error(context, &ctx->error, &ctx->cred);
_krb5_debug(context, 5, "krb5_get_init_creds: KRB-ERROR %d", ret);
/*
* If no preauth was set and KDC requires it, give it one
* more try.
*/
if (ret == KRB5KDC_ERR_PREAUTH_REQUIRED) {
free_METHOD_DATA(&ctx->md);
memset(&ctx->md, 0, sizeof(ctx->md));
if (ctx->error.e_data) {
ret = decode_METHOD_DATA(ctx->error.e_data->data,
ctx->error.e_data->length,
&ctx->md,
NULL);
if (ret)
krb5_set_error_message(context, ret,
N_("Failed to decode METHOD-DATA", ""));
} else {
krb5_set_error_message(context, ret,
N_("Preauth required but no preauth "
"options send by KDC", ""));
}
} else if (ret == KRB5KRB_AP_ERR_SKEW && context->kdc_sec_offset == 0) {
/*
* Try adapt to timeskrew when we are using pre-auth, and
* if there was a time skew, try again.
*/
krb5_set_real_time(context, ctx->error.stime, -1);
if (context->kdc_sec_offset)
ret = 0;
_krb5_debug(context, 10, "init_creds: err skew updateing kdc offset to %d",
context->kdc_sec_offset);
ctx->used_pa_types = 0;
} else if (ret == KRB5_KDC_ERR_WRONG_REALM && ctx->flags.canonicalize) {
/* client referal to a new realm */
if (ctx->error.crealm == NULL) {
krb5_set_error_message(context, ret,
N_("Got a client referral, not but no realm", ""));
goto out;
}
_krb5_debug(context, 5,
"krb5_get_init_creds: got referal to realm %s",
*ctx->error.crealm);
ret = krb5_principal_set_realm(context,
ctx->cred.client,
*ctx->error.crealm);
ctx->used_pa_types = 0;
}
if (ret)
goto out;
}
}
if (ctx->as_req.padata) {
free_METHOD_DATA(ctx->as_req.padata);
free(ctx->as_req.padata);
ctx->as_req.padata = NULL;
}
/* Set a new nonce. */
ctx->as_req.req_body.nonce = ctx->nonce;
/* fill_in_md_data */
ret = process_pa_data_to_md(context, &ctx->cred, &ctx->as_req, ctx,
&ctx->md, &ctx->as_req.padata,
ctx->prompter, ctx->prompter_data);
if (ret)
goto out;
krb5_data_free(&ctx->req_buffer);
ASN1_MALLOC_ENCODE(AS_REQ,
ctx->req_buffer.data, ctx->req_buffer.length,
&ctx->as_req, &len, ret);
if (ret)
goto out;
if(len != ctx->req_buffer.length)
krb5_abortx(context, "internal error in ASN.1 encoder");
out->data = ctx->req_buffer.data;
out->length = ctx->req_buffer.length;
*flags = KRB5_INIT_CREDS_STEP_FLAG_CONTINUE;
return 0;
out:
return ret;
}
/**
* Extract the newly acquired credentials from krb5_init_creds_context
* context.
*
* @param context A Kerberos 5 context.
* @param ctx
* @param cred credentials, free with krb5_free_cred_contents().
*
* @return 0 for sucess or An Kerberos error code, see krb5_get_error_message().
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_get_creds(krb5_context context,
krb5_init_creds_context ctx,
krb5_creds *cred)
{
return krb5_copy_creds_contents(context, &ctx->cred, cred);
}
/**
* Get the last error from the transaction.
*
* @return Returns 0 or an error code
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_get_error(krb5_context context,
krb5_init_creds_context ctx,
KRB_ERROR *error)
{
krb5_error_code ret;
ret = copy_KRB_ERROR(&ctx->error, error);
if (ret)
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
return ret;
}
/**
* Free the krb5_init_creds_context allocated by krb5_init_creds_init().
*
* @param context A Kerberos 5 context.
* @param ctx The krb5_init_creds_context to free.
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_init_creds_free(krb5_context context,
krb5_init_creds_context ctx)
{
free_init_creds_ctx(context, ctx);
free(ctx);
}
/**
* Get new credentials as setup by the krb5_init_creds_context.
*
* @param context A Kerberos 5 context.
* @param ctx The krb5_init_creds_context to process.
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_init_creds_get(krb5_context context, krb5_init_creds_context ctx)
{
krb5_sendto_ctx stctx = NULL;
krb5_krbhst_info *hostinfo = NULL;
krb5_error_code ret;
krb5_data in, out;
unsigned int flags = 0;
krb5_data_zero(&in);
krb5_data_zero(&out);
ret = krb5_sendto_ctx_alloc(context, &stctx);
if (ret)
goto out;
krb5_sendto_ctx_set_func(stctx, _krb5_kdc_retry, NULL);
while (1) {
flags = 0;
ret = krb5_init_creds_step(context, ctx, &in, &out, hostinfo, &flags);
krb5_data_free(&in);
if (ret)
goto out;
if ((flags & 1) == 0)
break;
ret = krb5_sendto_context (context, stctx, &out,
ctx->cred.client->realm, &in);
if (ret)
goto out;
}
out:
if (stctx)
krb5_sendto_ctx_free(context, stctx);
return ret;
}
/**
* Get new credentials using password.
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_init_creds_password(krb5_context context,
krb5_creds *creds,
krb5_principal client,
const char *password,
krb5_prompter_fct prompter,
void *data,
krb5_deltat start_time,
const char *in_tkt_service,
krb5_get_init_creds_opt *options)
{
krb5_init_creds_context ctx;
char buf[BUFSIZ];
krb5_error_code ret;
int chpw = 0;
again:
ret = krb5_init_creds_init(context, client, prompter, data, start_time, options, &ctx);
if (ret)
goto out;
ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
if (ret)
goto out;
if (prompter != NULL && ctx->password == NULL && password == NULL) {
krb5_prompt prompt;
krb5_data password_data;
char *p, *q;
krb5_unparse_name (context, client, &p);
asprintf (&q, "%s's Password: ", p);
free (p);
prompt.prompt = q;
password_data.data = buf;
password_data.length = sizeof(buf);
prompt.hidden = 1;
prompt.reply = &password_data;
prompt.type = KRB5_PROMPT_TYPE_PASSWORD;
ret = (*prompter) (context, data, NULL, NULL, 1, &prompt);
free (q);
if (ret) {
memset (buf, 0, sizeof(buf));
ret = KRB5_LIBOS_PWDINTR;
krb5_clear_error_message (context);
goto out;
}
password = password_data.data;
}
if (password) {
ret = krb5_init_creds_set_password(context, ctx, password);
if (ret)
goto out;
}
ret = krb5_init_creds_get(context, ctx);
if (ret == 0)
process_last_request(context, options, ctx);
if (ret == KRB5KDC_ERR_KEY_EXPIRED && chpw == 0) {
char buf2[1024];
/* try to avoid recursion */
if (in_tkt_service != NULL && strcmp(in_tkt_service, "kadmin/changepw") == 0)
goto out;
/* don't try to change password where then where none */
if (prompter == NULL)
goto out;
ret = change_password (context,
client,
ctx->password,
buf2,
sizeof(buf),
prompter,
data,
options);
if (ret)
goto out;
chpw = 1;
krb5_init_creds_free(context, ctx);
goto again;
}
out:
if (ret == 0)
krb5_init_creds_get_creds(context, ctx, creds);
if (ctx)
krb5_init_creds_free(context, ctx);
memset(buf, 0, sizeof(buf));
return ret;
}
/**
* Get new credentials using keyblock.
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_init_creds_keyblock(krb5_context context,
krb5_creds *creds,
krb5_principal client,
krb5_keyblock *keyblock,
krb5_deltat start_time,
const char *in_tkt_service,
krb5_get_init_creds_opt *options)
{
krb5_init_creds_context ctx;
krb5_error_code ret;
memset(creds, 0, sizeof(*creds));
ret = krb5_init_creds_init(context, client, NULL, NULL, start_time, options, &ctx);
if (ret)
goto out;
ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
if (ret)
goto out;
ret = krb5_init_creds_set_keyblock(context, ctx, keyblock);
if (ret)
goto out;
ret = krb5_init_creds_get(context, ctx);
if (ret == 0)
process_last_request(context, options, ctx);
out:
if (ret == 0)
krb5_init_creds_get_creds(context, ctx, creds);
if (ctx)
krb5_init_creds_free(context, ctx);
return ret;
}
/**
* Get new credentials using keytab.
*
* @ingroup krb5_credential
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_init_creds_keytab(krb5_context context,
krb5_creds *creds,
krb5_principal client,
krb5_keytab keytab,
krb5_deltat start_time,
const char *in_tkt_service,
krb5_get_init_creds_opt *options)
{
krb5_init_creds_context ctx;
krb5_error_code ret;
memset(creds, 0, sizeof(*creds));
ret = krb5_init_creds_init(context, client, NULL, NULL, start_time, options, &ctx);
if (ret)
goto out;
ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
if (ret)
goto out;
ret = krb5_init_creds_set_keytab(context, ctx, keytab);
if (ret)
goto out;
ret = krb5_init_creds_get(context, ctx);
if (ret == 0)
process_last_request(context, options, ctx);
out:
if (ret == 0)
krb5_init_creds_get_creds(context, ctx, creds);
if (ctx)
krb5_init_creds_free(context, ctx);
return ret;
}