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60137763e2941640bc0dc123e87d4e84a43550ef
heimdal/lib/krb5/v4_glue.c
Love Hörnquist Åstrand e7708a53d6 If its a Kerberos 4 error-code, remove the et BASE. 
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@21572 ec53bebd-3082-4978-b11e-865c3cabbd6b
2007-07-16 05:13:08 +00:00

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/*
* Copyright (c) 1997 - 2005 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("$Id$");
#include "krb5-v4compat.h"
/*
*
*/
#define RCHECK(r,func,label) \
do { (r) = func ; if (r) goto label; } while(0);
/* include this here, to avoid dependencies on libkrb */
static const int _tkt_lifetimes[TKTLIFENUMFIXED] = {
38400, 41055, 43894, 46929, 50174, 53643, 57352, 61318,
65558, 70091, 74937, 80119, 85658, 91581, 97914, 104684,
111922, 119661, 127935, 136781, 146239, 156350, 167161, 178720,
191077, 204289, 218415, 233517, 249664, 266926, 285383, 305116,
326213, 348769, 372885, 398668, 426234, 455705, 487215, 520904,
556921, 595430, 636601, 680618, 727680, 777995, 831789, 889303,
950794, 1016537, 1086825, 1161973, 1242318, 1328218, 1420057, 1518247,
1623226, 1735464, 1855462, 1983758, 2120925, 2267576, 2424367, 2592000
};
int KRB5_LIB_FUNCTION
_krb5_krb_time_to_life(time_t start, time_t end)
{
int i;
time_t life = end - start;
if (life > MAXTKTLIFETIME || life <= 0)
return 0;
#if 0
if (krb_no_long_lifetimes)
return (life + 5*60 - 1)/(5*60);
#endif
if (end >= NEVERDATE)
return TKTLIFENOEXPIRE;
if (life < _tkt_lifetimes[0])
return (life + 5*60 - 1)/(5*60);
for (i=0; i<TKTLIFENUMFIXED; i++)
if (life <= _tkt_lifetimes[i])
return i + TKTLIFEMINFIXED;
return 0;
}
time_t KRB5_LIB_FUNCTION
_krb5_krb_life_to_time(int start, int life_)
{
unsigned char life = (unsigned char) life_;
#if 0
if (krb_no_long_lifetimes)
return start + life*5*60;
#endif
if (life == TKTLIFENOEXPIRE)
return NEVERDATE;
if (life < TKTLIFEMINFIXED)
return start + life*5*60;
if (life > TKTLIFEMAXFIXED)
return start + MAXTKTLIFETIME;
return start + _tkt_lifetimes[life - TKTLIFEMINFIXED];
}
/*
* Get the name of the krb4 credentials cache, will use `tkfile' as
* the name if that is passed in. `cc' must be free()ed by caller,
*/
static krb5_error_code
get_krb4_cc_name(const char *tkfile, char **cc)
{
*cc = NULL;
if(tkfile == NULL) {
char *path;
if(!issuid()) {
path = getenv("KRBTKFILE");
if (path)
*cc = strdup(path);
}
if(*cc == NULL)
if (asprintf(cc, "%s%u", TKT_ROOT, (unsigned)getuid()) < 0)
return errno;
} else {
*cc = strdup(tkfile);
if (*cc == NULL)
return ENOMEM;
}
return 0;
}
/*
* Write a Kerberos 4 ticket file
*/
#define KRB5_TF_LCK_RETRY_COUNT 50
#define KRB5_TF_LCK_RETRY 1
static krb5_error_code
write_v4_cc(krb5_context context, const char *tkfile,
krb5_storage *sp, int append)
{
krb5_error_code ret;
struct stat sb;
krb5_data data;
char *path;
int fd, i;
ret = get_krb4_cc_name(tkfile, &path);
if (ret) {
krb5_set_error_string(context,
"krb5_krb_tf_setup: failed getting "
"the krb4 credentials cache name");
return ret;
}
fd = open(path, O_WRONLY|O_CREAT, 0600);
if (fd < 0) {
ret = errno;
krb5_set_error_string(context,
"krb5_krb_tf_setup: error opening file %s",
path);
free(path);
return ret;
}
if (fstat(fd, &sb) != 0 || !S_ISREG(sb.st_mode)) {
krb5_set_error_string(context,
"krb5_krb_tf_setup: tktfile %s is not a file",
path);
free(path);
close(fd);
return KRB5_FCC_PERM;
}
for (i = 0; i < KRB5_TF_LCK_RETRY_COUNT; i++) {
if (flock(fd, LOCK_EX | LOCK_NB) < 0) {
sleep(KRB5_TF_LCK_RETRY);
} else
break;
}
if (i == KRB5_TF_LCK_RETRY_COUNT) {
krb5_set_error_string(context,
"krb5_krb_tf_setup: failed to lock %s",
path);
free(path);
close(fd);
return KRB5_FCC_PERM;
}
if (!append) {
ret = ftruncate(fd, 0);
if (ret < 0) {
flock(fd, LOCK_UN);
krb5_set_error_string(context,
"krb5_krb_tf_setup: failed to truncate %s",
path);
free(path);
close(fd);
return KRB5_FCC_PERM;
}
}
ret = lseek(fd, 0L, SEEK_END);
if (ret < 0) {
ret = errno;
flock(fd, LOCK_UN);
free(path);
close(fd);
return ret;
}
krb5_storage_to_data(sp, &data);
ret = write(fd, data.data, data.length);
if (ret != data.length)
ret = KRB5_CC_IO;
krb5_free_data_contents(context, &data);
flock(fd, LOCK_UN);
free(path);
close(fd);
return 0;
}
/*
*
*/
krb5_error_code KRB5_LIB_FUNCTION
_krb5_krb_tf_setup(krb5_context context,
struct credentials *v4creds,
const char *tkfile,
int append)
{
krb5_error_code ret;
krb5_storage *sp;
sp = krb5_storage_emem();
if (sp == NULL)
return ENOMEM;
krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_HOST);
krb5_storage_set_eof_code(sp, KRB5_CC_IO);
krb5_clear_error_string(context);
if (!append) {
RCHECK(ret, krb5_store_stringz(sp, v4creds->pname), error);
RCHECK(ret, krb5_store_stringz(sp, v4creds->pinst), error);
}
/* cred */
RCHECK(ret, krb5_store_stringz(sp, v4creds->service), error);
RCHECK(ret, krb5_store_stringz(sp, v4creds->instance), error);
RCHECK(ret, krb5_store_stringz(sp, v4creds->realm), error);
ret = krb5_storage_write(sp, v4creds->session, 8);
if (ret != 8) {
ret = KRB5_CC_IO;
goto error;
}
RCHECK(ret, krb5_store_int32(sp, v4creds->lifetime), error);
RCHECK(ret, krb5_store_int32(sp, v4creds->kvno), error);
RCHECK(ret, krb5_store_int32(sp, v4creds->ticket_st.length), error);
ret = krb5_storage_write(sp, v4creds->ticket_st.dat,
v4creds->ticket_st.length);
if (ret != v4creds->ticket_st.length) {
ret = KRB5_CC_IO;
goto error;
}
RCHECK(ret, krb5_store_int32(sp, v4creds->issue_date), error);
ret = write_v4_cc(context, tkfile, sp, append);
error:
krb5_storage_free(sp);
return ret;
}
/*
*
*/
krb5_error_code KRB5_LIB_FUNCTION
_krb5_krb_dest_tkt(krb5_context context, const char *tkfile)
{
krb5_error_code ret;
char *path;
ret = get_krb4_cc_name(tkfile, &path);
if (ret) {
krb5_set_error_string(context,
"krb5_krb_tf_setup: failed getting "
"the krb4 credentials cache name");
return ret;
}
if (unlink(path) < 0) {
ret = errno;
krb5_set_error_string(context,
"krb5_krb_dest_tkt failed removing the cache "
"with error %s", strerror(ret));
}
free(path);
return ret;
}
/*
*
*/
static krb5_error_code
decrypt_etext(krb5_context context, const krb5_keyblock *key,
const krb5_data *cdata, krb5_data *data)
{
krb5_error_code ret;
krb5_crypto crypto;
ret = krb5_crypto_init(context, key, ETYPE_DES_PCBC_NONE, &crypto);
if (ret)
return ret;
ret = krb5_decrypt(context, crypto, 0, cdata->data, cdata->length, data);
krb5_crypto_destroy(context, crypto);
return ret;
}
/*
*
*/
static const char eightzeros[8] = "\x00\x00\x00\x00\x00\x00\x00\x00";
static krb5_error_code
storage_to_etext(krb5_context context,
krb5_storage *sp,
const krb5_keyblock *key,
krb5_data *enc_data)
{
krb5_error_code ret;
krb5_crypto crypto;
krb5_ssize_t size;
krb5_data data;
/* multiple of eight bytes */
size = krb5_storage_seek(sp, 0, SEEK_END);
if (size < 0)
return KRB4ET_RD_AP_UNDEC;
size = 8 - (size & 7);
ret = krb5_storage_write(sp, eightzeros, size);
if (ret != size)
return KRB4ET_RD_AP_UNDEC;
ret = krb5_storage_to_data(sp, &data);
if (ret)
return ret;
ret = krb5_crypto_init(context, key, ETYPE_DES_PCBC_NONE, &crypto);
if (ret) {
krb5_data_free(&data);
return ret;
}
ret = krb5_encrypt(context, crypto, 0, data.data, data.length, enc_data);
krb5_data_free(&data);
krb5_crypto_destroy(context, crypto);
return ret;
}
/*
*
*/
static krb5_error_code
put_nir(krb5_storage *sp, const char *name,
const char *instance, const char *realm)
{
krb5_error_code ret;
RCHECK(ret, krb5_store_stringz(sp, name), error);
RCHECK(ret, krb5_store_stringz(sp, instance), error);
if (realm) {
RCHECK(ret, krb5_store_stringz(sp, realm), error);
}
error:
return ret;
}
/*
*
*/
krb5_error_code KRB5_LIB_FUNCTION
_krb5_krb_create_ticket(krb5_context context,
unsigned char flags,
const char *pname,
const char *pinstance,
const char *prealm,
int32_t paddress,
const krb5_keyblock *session,
int16_t life,
int32_t life_sec,
const char *sname,
const char *sinstance,
const krb5_keyblock *key,
krb5_data *enc_data)
{
krb5_error_code ret;
krb5_storage *sp;
krb5_data_zero(enc_data);
sp = krb5_storage_emem();
if (sp == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_BE);
RCHECK(ret, krb5_store_int8(sp, flags), error);
RCHECK(ret, put_nir(sp, pname, pinstance, prealm), error);
RCHECK(ret, krb5_store_int32(sp, ntohl(paddress)), error);
/* session key */
ret = krb5_storage_write(sp,
session->keyvalue.data,
session->keyvalue.length);
if (ret != session->keyvalue.length) {
ret = KRB4ET_INTK_PROT;
goto error;
}
RCHECK(ret, krb5_store_int8(sp, life), error);
RCHECK(ret, krb5_store_int32(sp, life_sec), error);
RCHECK(ret, put_nir(sp, sname, sinstance, NULL), error);
ret = storage_to_etext(context, sp, key, enc_data);
error:
krb5_storage_free(sp);
if (ret)
krb5_set_error_string(context, "Failed to encode kerberos 4 ticket");
return ret;
}
/*
*
*/
krb5_error_code KRB5_LIB_FUNCTION
_krb5_krb_create_ciph(krb5_context context,
const krb5_keyblock *session,
const char *service,
const char *instance,
const char *realm,
uint32_t life,
unsigned char kvno,
const krb5_data *ticket,
uint32_t kdc_time,
const krb5_keyblock *key,
krb5_data *enc_data)
{
krb5_error_code ret;
krb5_storage *sp;
krb5_data_zero(enc_data);
sp = krb5_storage_emem();
if (sp == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_BE);
/* session key */
ret = krb5_storage_write(sp,
session->keyvalue.data,
session->keyvalue.length);
if (ret != session->keyvalue.length) {
ret = KRB4ET_INTK_PROT;
goto error;
}
RCHECK(ret, put_nir(sp, service, instance, realm), error);
RCHECK(ret, krb5_store_int8(sp, life), error);
RCHECK(ret, krb5_store_int8(sp, kvno), error);
RCHECK(ret, krb5_store_int8(sp, ticket->length), error);
ret = krb5_storage_write(sp, ticket->data, ticket->length);
if (ret != ticket->length) {
ret = KRB4ET_INTK_PROT;
goto error;
}
RCHECK(ret, krb5_store_int32(sp, kdc_time), error);
ret = storage_to_etext(context, sp, key, enc_data);
error:
krb5_storage_free(sp);
if (ret)
krb5_set_error_string(context, "Failed to encode kerberos 4 ticket");
return ret;
}
/*
*
*/
krb5_error_code KRB5_LIB_FUNCTION
_krb5_krb_create_auth_reply(krb5_context context,
const char *pname,
const char *pinst,
const char *prealm,
int32_t time_ws,
int n,
uint32_t x_date,
unsigned char kvno,
const krb5_data *cipher,
krb5_data *data)
{
krb5_error_code ret;
krb5_storage *sp;
krb5_data_zero(data);
sp = krb5_storage_emem();
if (sp == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_BE);
RCHECK(ret, krb5_store_int8(sp, KRB_PROT_VERSION), error);
RCHECK(ret, krb5_store_int8(sp, AUTH_MSG_KDC_REPLY), error);
RCHECK(ret, put_nir(sp, pname, pinst, prealm), error);
RCHECK(ret, krb5_store_int32(sp, time_ws), error);
RCHECK(ret, krb5_store_int8(sp, n), error);
RCHECK(ret, krb5_store_int32(sp, x_date), error);
RCHECK(ret, krb5_store_int8(sp, kvno), error);
RCHECK(ret, krb5_store_int16(sp, cipher->length), error);
ret = krb5_storage_write(sp, cipher->data, cipher->length);
if (ret != cipher->length) {
ret = KRB4ET_INTK_PROT;
goto error;
}
ret = krb5_storage_to_data(sp, data);
error:
krb5_storage_free(sp);
if (ret)
krb5_set_error_string(context, "Failed to encode kerberos 4 ticket");
return ret;
}
/*
*
*/
krb5_error_code KRB5_LIB_FUNCTION
_krb5_krb_cr_err_reply(krb5_context context,
const char *name,
const char *inst,
const char *realm,
uint32_t time_ws,
uint32_t e,
const char *e_string,
krb5_data *data)
{
krb5_error_code ret;
krb5_storage *sp;
krb5_data_zero(data);
if (name == NULL) name = "";
if (inst == NULL) inst = "";
if (realm == NULL) realm = "";
if (e_string == NULL) e_string = "";
sp = krb5_storage_emem();
if (sp == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_BE);
RCHECK(ret, krb5_store_int8(sp, KRB_PROT_VERSION), error);
RCHECK(ret, krb5_store_int8(sp, AUTH_MSG_ERR_REPLY), error);
RCHECK(ret, put_nir(sp, name, inst, realm), error);
RCHECK(ret, krb5_store_int32(sp, time_ws), error);
/* If its a Kerberos 4 error-code, remove the et BASE */
if (e >= ERROR_TABLE_BASE_krb && e <= ERROR_TABLE_BASE_krb + 255)
e -= ERROR_TABLE_BASE_krb;
RCHECK(ret, krb5_store_int32(sp, e), error);
RCHECK(ret, krb5_store_stringz(sp, e_string), error);
ret = krb5_storage_to_data(sp, data);
error:
krb5_storage_free(sp);
if (ret)
krb5_set_error_string(context, "Failed to encode kerberos 4 error");
return 0;
}
static krb5_error_code
get_v4_stringz(krb5_storage *sp, char **str, size_t max_len)
{
krb5_error_code ret;
ret = krb5_ret_stringz(sp, str);
if (ret)
return ret;
if (strlen(*str) > max_len) {
free(*str);
*str = NULL;
return KRB4ET_INTK_PROT;
}
return 0;
}
/*
*
*/
krb5_error_code KRB5_LIB_FUNCTION
_krb5_krb_decomp_ticket(krb5_context context,
const krb5_data *enc_ticket,
const krb5_keyblock *key,
const char *local_realm,
char **sname,
char **sinstance,
struct _krb5_krb_auth_data *ad)
{
krb5_error_code ret;
krb5_ssize_t size;
krb5_storage *sp = NULL;
krb5_data ticket;
unsigned char des_key[8];
memset(ad, 0, sizeof(*ad));
krb5_data_zero(&ticket);
*sname = NULL;
*sinstance = NULL;
RCHECK(ret, decrypt_etext(context, key, enc_ticket, &ticket), error);
sp = krb5_storage_from_data(&ticket);
if (sp == NULL) {
krb5_data_free(&ticket);
krb5_set_error_string(context, "alloc: out of memory");
return ENOMEM;
}
krb5_storage_set_eof_code(sp, KRB4ET_INTK_PROT);
RCHECK(ret, krb5_ret_int8(sp, &ad->k_flags), error);
RCHECK(ret, get_v4_stringz(sp, &ad->pname, ANAME_SZ), error);
RCHECK(ret, get_v4_stringz(sp, &ad->pinst, INST_SZ), error);
RCHECK(ret, get_v4_stringz(sp, &ad->prealm, REALM_SZ), error);
RCHECK(ret, krb5_ret_uint32(sp, &ad->address), error);
size = krb5_storage_read(sp, des_key, sizeof(des_key));
if (size != sizeof(des_key)) {
ret = KRB4ET_INTK_PROT;
goto error;
}
RCHECK(ret, krb5_ret_uint8(sp, &ad->life), error);
if (ad->k_flags & 1)
krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_LE);
else
krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_BE);
RCHECK(ret, krb5_ret_uint32(sp, &ad->time_sec), error);
RCHECK(ret, get_v4_stringz(sp, sname, ANAME_SZ), error);
RCHECK(ret, get_v4_stringz(sp, sinstance, INST_SZ), error);
ret = krb5_keyblock_init(context, ETYPE_DES_PCBC_NONE,
des_key, sizeof(des_key), &ad->session);
if (ret)
goto error;
if (strlen(ad->prealm) == 0) {
free(ad->prealm);
ad->prealm = strdup(local_realm);
if (ad->prealm == NULL) {
ret = ENOMEM;
goto error;
}
}
error:
memset(des_key, 0, sizeof(des_key));
if (sp)
krb5_storage_free(sp);
krb5_data_free(&ticket);
if (ret) {
if (*sname) {
free(*sname);
*sname = NULL;
}
if (*sinstance) {
free(*sinstance);
*sinstance = NULL;
}
_krb5_krb_free_auth_data(context, ad);
krb5_set_error_string(context, "Failed to decode v4 ticket");
}
return ret;
}
/*
*
*/
krb5_error_code KRB5_LIB_FUNCTION
_krb5_krb_rd_req(krb5_context context,
krb5_data *authent,
const char *service,
const char *instance,
const char *local_realm,
int32_t from_addr,
const krb5_keyblock *key,
struct _krb5_krb_auth_data *ad)
{
krb5_error_code ret;
krb5_storage *sp;
krb5_data ticket, eaut, aut;
krb5_ssize_t size;
int little_endian;
int8_t pvno;
int8_t type;
int8_t s_kvno;
uint8_t ticket_length;
uint8_t eaut_length;
uint8_t time_5ms;
char *realm = NULL;
char *sname = NULL;
char *sinstance = NULL;
char *r_realm = NULL;
char *r_name = NULL;
char *r_instance = NULL;
uint32_t r_time_sec; /* Coarse time from authenticator */
unsigned long delta_t; /* Time in authenticator - local time */
long tkt_age; /* Age of ticket */
struct timeval tv;
krb5_data_zero(&ticket);
krb5_data_zero(&eaut);
krb5_data_zero(&aut);
sp = krb5_storage_from_data(authent);
if (sp == NULL) {
krb5_set_error_string(context, "alloc: out of memory");
return ENOMEM;
}
krb5_storage_set_eof_code(sp, KRB4ET_INTK_PROT);
ret = krb5_ret_int8(sp, &pvno);
if (ret) {
krb5_set_error_string(context, "Failed reading v4 pvno");
goto error;
}
if (pvno != KRB_PROT_VERSION) {
ret = KRB4ET_RD_AP_VERSION;
krb5_set_error_string(context, "Failed v4 pvno not 4");
goto error;
}
ret = krb5_ret_int8(sp, &type);
if (ret) {
krb5_set_error_string(context, "Failed readin v4 type");
goto error;
}
little_endian = type & 1;
type &= ~1;
if(type != AUTH_MSG_APPL_REQUEST && type != AUTH_MSG_APPL_REQUEST_MUTUAL) {
ret = KRB4ET_RD_AP_MSG_TYPE;
krb5_set_error_string(context, "Not a valid v4 request type");
goto error;
}
RCHECK(ret, krb5_ret_int8(sp, &s_kvno), error);
RCHECK(ret, get_v4_stringz(sp, &realm, REALM_SZ), error);
RCHECK(ret, krb5_ret_uint8(sp, &ticket_length), error);
RCHECK(ret, krb5_ret_uint8(sp, &eaut_length), error);
RCHECK(ret, krb5_data_alloc(&ticket, ticket_length), error);
size = krb5_storage_read(sp, ticket.data, ticket.length);
if (size != ticket.length) {
ret = KRB4ET_INTK_PROT;
krb5_set_error_string(context, "Failed reading v4 ticket");
goto error;
}
/* Decrypt and take apart ticket */
ret = _krb5_krb_decomp_ticket(context, &ticket, key, local_realm,
&sname, &sinstance, ad);
if (ret)
goto error;
RCHECK(ret, krb5_data_alloc(&eaut, eaut_length), error);
size = krb5_storage_read(sp, eaut.data, eaut.length);
if (size != eaut.length) {
ret = KRB4ET_INTK_PROT;
krb5_set_error_string(context, "Failed reading v4 authenticator");
goto error;
}
krb5_storage_free(sp);
sp = NULL;
ret = decrypt_etext(context, &ad->session, &eaut, &aut);
if (ret)
goto error;
sp = krb5_storage_from_data(&aut);
if (sp == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "alloc: out of memory");
goto error;
}
if (little_endian)
krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_LE);
else
krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_BE);
RCHECK(ret, get_v4_stringz(sp, &r_name, ANAME_SZ), error);
RCHECK(ret, get_v4_stringz(sp, &r_instance, INST_SZ), error);
RCHECK(ret, get_v4_stringz(sp, &r_realm, REALM_SZ), error);
RCHECK(ret, krb5_ret_uint32(sp, &ad->checksum), error);
RCHECK(ret, krb5_ret_uint8(sp, &time_5ms), error);
RCHECK(ret, krb5_ret_uint32(sp, &r_time_sec), error);
if (strcmp(ad->pname, r_name) != 0 ||
strcmp(ad->pinst, r_instance) != 0 ||
strcmp(ad->prealm, r_realm) != 0) {
krb5_set_error_string(context, "v4 principal mismatch");
ret = KRB4ET_RD_AP_INCON;
goto error;
}
if (from_addr && ad->address && from_addr != ad->address) {
krb5_set_error_string(context, "v4 bad address in ticket");
ret = KRB4ET_RD_AP_BADD;
goto error;
}
gettimeofday(&tv, NULL);
delta_t = abs((int)(tv.tv_sec - r_time_sec));
if (delta_t > CLOCK_SKEW) {
ret = KRB4ET_RD_AP_TIME;
krb5_set_error_string(context, "v4 clock skew");
goto error;
}
/* Now check for expiration of ticket */
tkt_age = tv.tv_sec - ad->time_sec;
if ((tkt_age < 0) && (-tkt_age > CLOCK_SKEW)) {
ret = KRB4ET_RD_AP_NYV;
krb5_set_error_string(context, "v4 clock skew for expiration");
goto error;
}
if (tv.tv_sec > _krb5_krb_life_to_time(ad->time_sec, ad->life)) {
ret = KRB4ET_RD_AP_EXP;
krb5_set_error_string(context, "v4 ticket expired");
goto error;
}
ret = 0;
error:
krb5_data_free(&ticket);
krb5_data_free(&eaut);
krb5_data_free(&aut);
if (realm)
free(realm);
if (sname)
free(sname);
if (sinstance)
free(sinstance);
if (r_name)
free(r_name);
if (r_instance)
free(r_instance);
if (r_realm)
free(r_realm);
if (sp)
krb5_storage_free(sp);
if (ret)
krb5_clear_error_string(context);
return ret;
}
/*
*
*/
void KRB5_LIB_FUNCTION
_krb5_krb_free_auth_data(krb5_context context, struct _krb5_krb_auth_data *ad)
{
if (ad->pname)
free(ad->pname);
if (ad->pinst)
free(ad->pinst);
if (ad->prealm)
free(ad->prealm);
krb5_free_keyblock_contents(context, &ad->session);
memset(ad, 0, sizeof(*ad));
}
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