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12ed86de90504b75f9001a5429f4e151d19d49b4
heimdal/kdc/process.c
Nicolas Williams dcef1341d3 kdc: Add error symbols for error logging 
Having "KRB5KRB_AP_ERR_ILL_CR_TKT" in log messages is much better than
"UNKNOWN--1765328341".
2022-03-16 15:04:10 -05:00

605 lines
15 KiB
C
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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 "kdc_locl.h"
#include <vis.h>
/*
*
*/
#undef __attribute__
#define __attribute__(x)
KDC_LIB_FUNCTION void KDC_LIB_CALL
kdc_audit_vaddreason(kdc_request_t r, const char *fmt, va_list ap)
__attribute__ ((__format__ (__printf__, 2, 0)))
{
heim_audit_vaddreason((heim_svc_req_desc)r, fmt, ap);
}
KDC_LIB_FUNCTION void KDC_LIB_CALL
kdc_audit_addreason(kdc_request_t r, const char *fmt, ...)
__attribute__ ((__format__ (__printf__, 2, 3)))
{
va_list ap;
va_start(ap, fmt);
heim_audit_vaddreason((heim_svc_req_desc)r, fmt, ap);
va_end(ap);
}
/*
* append_token adds a token which is optionally a kv-pair and it
* also optionally eats the whitespace. If k == NULL, then it's
* not a kv-pair.
*/
KDC_LIB_FUNCTION void KDC_LIB_CALL
kdc_audit_vaddkv(kdc_request_t r, int flags, const char *k,
const char *fmt, va_list ap)
__attribute__ ((__format__ (__printf__, 4, 0)))
{
heim_audit_vaddkv((heim_svc_req_desc)r, flags, k, fmt, ap);
}
KDC_LIB_FUNCTION void KDC_LIB_CALL
kdc_audit_addkv(kdc_request_t r, int flags, const char *k,
const char *fmt, ...)
__attribute__ ((__format__ (__printf__, 4, 5)))
{
va_list ap;
va_start(ap, fmt);
heim_audit_vaddkv((heim_svc_req_desc)r, flags, k, fmt, ap);
va_end(ap);
}
KDC_LIB_FUNCTION void KDC_LIB_CALL
kdc_audit_addkv_timediff(kdc_request_t r, const char *k,
const struct timeval *start,
const struct timeval *end)
{
heim_audit_addkv_timediff((heim_svc_req_desc)r,k, start, end);
}
KDC_LIB_FUNCTION void KDC_LIB_CALL
kdc_audit_setkv_bool(kdc_request_t r, const char *k, krb5_boolean v)
{
heim_audit_setkv_bool((heim_svc_req_desc)r, k, (int)v);
}
KDC_LIB_FUNCTION void KDC_LIB_CALL
kdc_audit_addkv_number(kdc_request_t r, const char *k, int64_t v)
{
heim_audit_addkv_number((heim_svc_req_desc)r, k, v);
}
KDC_LIB_FUNCTION void KDC_LIB_CALL
kdc_audit_setkv_number(kdc_request_t r, const char *k, int64_t v)
{
heim_audit_setkv_number((heim_svc_req_desc)r, k, v);
}
KDC_LIB_FUNCTION void KDC_LIB_CALL
kdc_audit_addkv_object(kdc_request_t r, const char *k, kdc_object_t obj)
{
heim_audit_addkv_object((heim_svc_req_desc)r, k, obj);
}
KDC_LIB_FUNCTION void KDC_LIB_CALL
kdc_audit_setkv_object(kdc_request_t r, const char *k, kdc_object_t obj)
{
heim_audit_setkv_object((heim_svc_req_desc)r, k, obj);
}
KDC_LIB_FUNCTION kdc_object_t KDC_LIB_CALL
kdc_audit_getkv(kdc_request_t r, const char *k)
{
return heim_audit_getkv((heim_svc_req_desc)r, k);
}
/*
* Add up to 3 key value pairs to record HostAddresses from request body or
* PA-TGS ticket or whatever.
*/
KDC_LIB_FUNCTION void KDC_LIB_CALL
kdc_audit_addaddrs(kdc_request_t r, HostAddresses *a, const char *key)
{
size_t i;
char buf[128];
if (a->len > 3) {
char numkey[32];
if (snprintf(numkey, sizeof(numkey), "num%s", key) >= sizeof(numkey))
numkey[31] = '\0';
kdc_audit_addkv(r, 0, numkey, "%llu", (unsigned long long)a->len);
}
for (i = 0; i < 3 && i < a->len; i++) {
if (krb5_print_address(&a->val[i], buf, sizeof(buf), NULL) == 0)
kdc_audit_addkv(r, 0, key, "%s", buf);
}
}
KDC_LIB_FUNCTION void KDC_LIB_CALL
_kdc_audit_trail(kdc_request_t r, krb5_error_code ret)
{
const char *retname = NULL;
/* Get a symbolic name for some error codes */
#define CASE(x) case x : retname = #x; break
switch (ret ? ret : r->error_code) {
CASE(ENOMEM);
CASE(EACCES);
CASE(HDB_ERR_NOT_FOUND_HERE);
CASE(HDB_ERR_WRONG_REALM);
CASE(HDB_ERR_EXISTS);
CASE(HDB_ERR_KVNO_NOT_FOUND);
CASE(HDB_ERR_NOENTRY);
CASE(HDB_ERR_NO_MKEY);
CASE(KRB5KDC_ERR_BADOPTION);
CASE(KRB5KDC_ERR_CANNOT_POSTDATE);
CASE(KRB5KDC_ERR_CLIENT_NOTYET);
CASE(KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN);
CASE(KRB5KDC_ERR_ETYPE_NOSUPP);
CASE(KRB5KDC_ERR_KEY_EXPIRED);
CASE(KRB5KDC_ERR_NAME_EXP);
CASE(KRB5KDC_ERR_NEVER_VALID);
CASE(KRB5KDC_ERR_NONE);
CASE(KRB5KDC_ERR_NULL_KEY);
CASE(KRB5KDC_ERR_PADATA_TYPE_NOSUPP);
CASE(KRB5KDC_ERR_POLICY);
CASE(KRB5KDC_ERR_PREAUTH_FAILED);
CASE(KRB5KDC_ERR_PREAUTH_REQUIRED);
CASE(KRB5KDC_ERR_SERVER_NOMATCH);
CASE(KRB5KDC_ERR_SERVICE_EXP);
CASE(KRB5KDC_ERR_SERVICE_NOTYET);
CASE(KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN);
CASE(KRB5KDC_ERR_TRTYPE_NOSUPP);
CASE(KRB5KRB_AP_ERR_BADADDR);
CASE(KRB5KRB_AP_ERR_BADDIRECTION);
CASE(KRB5KRB_AP_ERR_BAD_INTEGRITY);
CASE(KRB5KRB_AP_ERR_BADKEYVER);
CASE(KRB5KRB_AP_ERR_BADMATCH);
CASE(KRB5KRB_AP_ERR_BADORDER);
CASE(KRB5KRB_AP_ERR_BADSEQ);
CASE(KRB5KRB_AP_ERR_BADVERSION);
CASE(KRB5KRB_AP_ERR_ILL_CR_TKT);
CASE(KRB5KRB_AP_ERR_INAPP_CKSUM);
CASE(KRB5KRB_AP_ERR_METHOD);
CASE(KRB5KRB_AP_ERR_MODIFIED);
CASE(KRB5KRB_AP_ERR_MSG_TYPE);
CASE(KRB5KRB_AP_ERR_MUT_FAIL);
CASE(KRB5KRB_AP_ERR_NOKEY);
CASE(KRB5KRB_AP_ERR_NOT_US);
CASE(KRB5KRB_AP_ERR_REPEAT);
CASE(KRB5KRB_AP_ERR_SKEW);
CASE(KRB5KRB_AP_ERR_TKT_EXPIRED);
CASE(KRB5KRB_AP_ERR_TKT_INVALID);
CASE(KRB5KRB_AP_ERR_TKT_NYV);
CASE(KRB5KRB_AP_ERR_V4_REPLY);
CASE(KRB5KRB_AP_PATH_NOT_ACCEPTED);
CASE(KRB5KRB_AP_WRONG_PRINC);
CASE(KRB5KRB_ERR_FIELD_TOOLONG);
CASE(KRB5KRB_ERR_GENERIC);
CASE(KRB5KRB_ERR_RESPONSE_TOO_BIG);
case 0:
retname = "SUCCESS";
break;
default:
retname = NULL;
break;
}
/* Let's save a few bytes */
#define PREFIX "KRB5KDC_"
if (retname && strncmp(PREFIX, retname, strlen(PREFIX)) == 0)
retname += strlen(PREFIX);
#undef PREFIX
heim_audit_trail((heim_svc_req_desc)r, ret, retname);
}
KDC_LIB_FUNCTION void KDC_LIB_CALL
krb5_kdc_update_time(struct timeval *tv)
{
if (tv == NULL)
gettimeofday(&_kdc_now, NULL);
else
_kdc_now = *tv;
}
#define EXTEND_REQUEST_T(LHS, RHS) do { \
RHS = realloc(LHS, sizeof(*RHS)); \
if (!RHS) \
return krb5_enomem((LHS)->context); \
LHS = (void *)RHS; \
memset(((char *)LHS) + sizeof(*LHS), \
0x0, \
sizeof(*RHS) - sizeof(*LHS)); \
} while (0)
static krb5_error_code
kdc_as_req(kdc_request_t *rptr, int *claim)
{
astgs_request_t r;
krb5_error_code ret;
size_t len;
/* We must free things in the extensions */
EXTEND_REQUEST_T(*rptr, r);
ret = decode_AS_REQ(r->request.data, r->request.length, &r->req, &len);
if (ret)
return ret;
r->reqtype = "AS-REQ";
r->use_request_t = 1;
*claim = 1;
ret = _kdc_as_rep(r);
free_AS_REQ(&r->req);
return ret;
}
static krb5_error_code
kdc_tgs_req(kdc_request_t *rptr, int *claim)
{
astgs_request_t r;
krb5_error_code ret;
size_t len;
/* We must free things in the extensions */
EXTEND_REQUEST_T(*rptr, r);
ret = decode_TGS_REQ(r->request.data, r->request.length, &r->req, &len);
if (ret)
return ret;
r->reqtype = "TGS-REQ";
r->use_request_t = 1;
*claim = 1;
ret = _kdc_tgs_rep(r);
free_TGS_REQ(&r->req);
return ret;
}
#ifdef DIGEST
static krb5_error_code
kdc_digest(kdc_request_t *rptr, int *claim)
{
kdc_request_t r;
DigestREQ digestreq;
krb5_error_code ret;
size_t len;
r = *rptr;
ret = decode_DigestREQ(r->request.data, r->request.length,
&digestreq, &len);
if (ret)
return ret;
r->use_request_t = 0;
*claim = 1;
ret = _kdc_do_digest(r->context, r->config, &digestreq,
r->reply, r->from, r->addr);
free_DigestREQ(&digestreq);
return ret;
}
#endif
#ifdef KX509
static krb5_error_code
kdc_kx509(kdc_request_t *rptr, int *claim)
{
kx509_req_context r;
krb5_error_code ret;
/* We must free things in the extensions */
EXTEND_REQUEST_T(*rptr, r);
ret = _kdc_try_kx509_request(r);
if (ret)
return ret;
r->use_request_t = 1;
r->reqtype = "KX509";
*claim = 1;
return _kdc_do_kx509(r); /* Must clean up the req struct extensions */
}
#endif
static struct krb5_kdc_service services[] = {
{ KS_KRB5, "AS-REQ", kdc_as_req },
{ KS_KRB5, "TGS-REQ", kdc_tgs_req },
#ifdef DIGEST
{ 0, "DIGEST", kdc_digest },
#endif
#ifdef KX509
{ 0, "KX509", kdc_kx509 },
#endif
{ 0, NULL, NULL }
};
static int
process_request(krb5_context context,
krb5_kdc_configuration *config,
unsigned int krb5_only,
unsigned char *buf,
size_t len,
krb5_data *reply,
krb5_boolean *prependlength,
const char *from,
struct sockaddr *addr,
int datagram_reply)
{
kdc_request_t r;
krb5_error_code ret;
unsigned int i;
int claim = 0;
r = calloc(sizeof(*r), 1);
if (!r)
return krb5_enomem(context);
r->context = context;
r->hcontext = context->hcontext;
r->config = config;
r->logf = config->logf;
r->from = from;
r->addr = addr;
r->request.data = buf;
r->request.length = len;
r->datagram_reply = datagram_reply;
r->reply = reply;
r->kv = heim_dict_create(10);
r->attributes = heim_dict_create(1);
if (r->kv == NULL || r->attributes == NULL) {
heim_release(r->kv);
heim_release(r->attributes);
free(r);
return krb5_enomem(context);
}
gettimeofday(&r->tv_start, NULL);
for (i = 0; services[i].process != NULL; i++) {
if (krb5_only && (services[i].flags & KS_KRB5) == 0)
continue;
kdc_log(context, config, 7, "Probing for %s", services[i].name);
ret = (*services[i].process)(&r, &claim);
if (claim) {
if (prependlength && services[i].flags & KS_NO_LENGTH)
*prependlength = 0;
if (r->use_request_t) {
gettimeofday(&r->tv_end, NULL);
_kdc_audit_trail(r, ret);
free(r->cname);
free(r->sname);
free(r->e_text_buf);
}
heim_release(r->reason);
heim_release(r->kv);
heim_release(r->attributes);
free(r);
return ret;
}
}
heim_release(r->reason);
heim_release(r->kv);
heim_release(r->attributes);
free(r);
return -1;
}
/*
* handle the request in `buf, len', from `addr' (or `from' as a string),
* sending a reply in `reply'.
*/
KDC_LIB_FUNCTION int KDC_LIB_CALL
krb5_kdc_process_request(krb5_context context,
krb5_kdc_configuration *config,
unsigned char *buf,
size_t len,
krb5_data *reply,
krb5_boolean *prependlength,
const char *from,
struct sockaddr *addr,
int datagram_reply)
{
return process_request(context, config, 0, buf, len, reply, prependlength,
from, addr, datagram_reply);
}
/*
* handle the request in `buf, len', from `addr' (or `from' as a string),
* sending a reply in `reply'.
*
* This only processes krb5 requests
*/
KDC_LIB_FUNCTION int KDC_LIB_CALL
krb5_kdc_process_krb5_request(krb5_context context,
krb5_kdc_configuration *config,
unsigned char *buf,
size_t len,
krb5_data *reply,
const char *from,
struct sockaddr *addr,
int datagram_reply)
{
return process_request(context, config, 1, buf, len, reply, NULL,
from, addr, datagram_reply);
}
/*
*
*/
KDC_LIB_FUNCTION int KDC_LIB_CALL
krb5_kdc_save_request(krb5_context context,
const char *fn,
const unsigned char *buf,
size_t len,
const krb5_data *reply,
const struct sockaddr *sa)
{
krb5_storage *sp;
krb5_address a;
int fd = -1;
int ret = 0;
uint32_t t;
krb5_data d;
memset(&a, 0, sizeof(a));
d.data = rk_UNCONST(buf); /* do not free here */
d.length = len;
t = _kdc_now.tv_sec;
sp = krb5_storage_emem();
if (sp == NULL)
ret = krb5_enomem(context);
if (ret == 0)
ret = krb5_sockaddr2address(context, sa, &a);
if (ret == 0)
ret = krb5_store_uint32(sp, 1);
if (ret == 0)
ret = krb5_store_uint32(sp, t);
if (ret == 0)
ret = krb5_store_address(sp, a);
if (ret == 0)
ret = krb5_store_data(sp, d);
d.length = 0;
d.data = NULL;
if (ret == 0) {
Der_class cl;
Der_type ty;
unsigned int tag;
ret = der_get_tag (reply->data, reply->length,
&cl, &ty, &tag, NULL);
if (ret) {
ret = krb5_store_uint32(sp, 0xffffffff);
if (ret == 0)
ret = krb5_store_uint32(sp, 0xffffffff);
} else {
ret = krb5_store_uint32(sp, MAKE_TAG(cl, ty, 0));
if (ret == 0)
ret = krb5_store_uint32(sp, tag);
}
}
if (ret == 0)
ret = krb5_storage_to_data(sp, &d);
krb5_storage_free(sp);
sp = NULL;
/*
* We've got KDC concurrency, so we're going to try to do a single O_APPEND
* write(2). Hopefully we manage to write enough of the header that one
* can skip this request if it fails to write completely.
*/
if (ret == 0)
fd = open(fn, O_WRONLY|O_CREAT|O_APPEND, 0600);
if (fd < 0)
krb5_set_error_message(context, ret = errno, "Failed to open: %s", fn);
if (ret == 0) {
sp = krb5_storage_from_fd(fd);
if (sp == NULL)
krb5_set_error_message(context, ret = ENOMEM,
"Storage failed to open fd");
}
(void) close(fd);
if (ret == 0)
ret = krb5_store_data(sp, d);
krb5_free_address(context, &a);
/*
* krb5_storage_free() currently always returns 0, but for FDs it sets
* errno to whatever close() set it to if it failed.
*/
errno = 0;
if (ret == 0)
ret = krb5_storage_free(sp);
else
(void) krb5_storage_free(sp);
if (ret == 0 && errno)
ret = errno;
return ret;
}
KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL
kdc_request_set_attribute(kdc_request_t r, kdc_object_t key, kdc_object_t value)
{
return heim_dict_set_value(r->attributes, key, value);
}
KDC_LIB_FUNCTION kdc_object_t KDC_LIB_CALL
kdc_request_get_attribute(kdc_request_t r, kdc_object_t key)
{
return heim_dict_get_value(r->attributes, key);
}
KDC_LIB_FUNCTION kdc_object_t KDC_LIB_CALL
kdc_request_copy_attribute(kdc_request_t r, kdc_object_t key)
{
return heim_dict_copy_value(r->attributes, key);
}
KDC_LIB_FUNCTION void KDC_LIB_CALL
kdc_request_delete_attribute(kdc_request_t r, kdc_object_t key)
{
heim_dict_delete_key(r->attributes, key);
}
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