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HardenedBSD/crypto/heimdal/kadmin/rpc.c
stas e7e0b34988 - Update FreeBSD Heimdal distribution to version 1.5.1. This also brings 
several new kerberos related libraries and applications to FreeBSD:
  o kgetcred(1) allows one to manually get a ticket for a particular service.
  o kf(1) securily forwards ticket to another host through an authenticated
    and encrypted stream.
  o kcc(1) is an umbrella program around klist(1), kswitch(1), kgetcred(1)
    and other user kerberos operations. klist and kswitch are just symlinks
    to kcc(1) now.
  o kswitch(1) allows you to easily switch between kerberos credentials if
    you're running KCM.
  o hxtool(1) is a certificate management tool to use with PKINIT.
  o string2key(1) maps a password into key.
  o kdigest(8) is a userland tool to access the KDC's digest interface.
  o kimpersonate(8) creates a "fake" ticket for a service.

  We also now install manpages for some lirbaries that were not installed
  before, libheimntlm and libhx509.

- The new HEIMDAL version no longer supports Kerberos 4.  All users are
  recommended to switch to Kerberos 5.

- Weak ciphers are now disabled by default.  To enable DES support (used
  by telnet(8)), use "allow_weak_crypto" option in krb5.conf.

- libtelnet, pam_ksu and pam_krb5 are now compiled with error on warnings
  disabled due to the function they use (krb5_get_err_text(3)) being
  deprecated.  I plan to work on this next.

- Heimdal's KDC now require sqlite to operate.  We use the bundled version
  and install it as libheimsqlite.  If some other FreeBSD components will
  require it in the future we can rename it to libbsdsqlite and use for these
  components as well.

- This is not a latest Heimdal version, the new one was released while I was
  working on the update.  I will update it to 1.5.2 soon, as it fixes some
  important bugs and security issues.
2012-03-22 08:48:42 +00:00

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/*
* Copyright (c) 2008 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 "kadmin_locl.h"
#include <gssapi/gssapi.h>
//#include <gssapi_krb5.h>
//#include <gssapi_spnego.h>
static gss_OID_desc krb5_mechanism =
{9, (void *)(uintptr_t) "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"};
#define GSS_KRB5_MECHANISM (&krb5_mechanism)
#define CHECK(x) \
do { \
int __r; \
if ((__r = (x))) { \
krb5_errx(dcontext, 1, "Failed (%d) on %s:%d", \
__r, __FILE__, __LINE__); \
} \
} while(0)
static krb5_context dcontext;
#define INSIST(x) CHECK(!(x))
#define VERSION2 0x12345702
#define LAST_FRAGMENT 0x80000000
#define RPC_VERSION 2
#define KADM_SERVER 2112
#define VVERSION 2
#define FLAVOR_GSS 6
#define FLAVOR_GSS_VERSION 1
struct opaque_auth {
uint32_t flavor;
krb5_data data;
};
struct call_header {
uint32_t xid;
uint32_t rpcvers;
uint32_t prog;
uint32_t vers;
uint32_t proc;
struct opaque_auth cred;
struct opaque_auth verf;
};
enum {
RPG_DATA = 0,
RPG_INIT = 1,
RPG_CONTINUE_INIT = 2,
RPG_DESTROY = 3
};
enum {
rpg_privacy = 3
};
/*
struct chrand_ret {
krb5_ui_4 api_version;
kadm5_ret_t ret;
int n_keys;
krb5_keyblock *keys;
};
*/
struct gcred {
uint32_t version;
uint32_t proc;
uint32_t seq_num;
uint32_t service;
krb5_data handle;
};
static int
parse_name(const unsigned char *p, size_t len,
const gss_OID oid, char **name)
{
size_t l;
if (len < 4)
return 1;
/* TOK_ID */
if (memcmp(p, "\x04\x01", 2) != 0)
return 1;
len -= 2;
p += 2;
/* MECH_LEN */
l = (p[0] << 8) | p[1];
len -= 2;
p += 2;
if (l < 2 || len < l)
return 1;
/* oid wrapping */
if (p[0] != 6 || p[1] != l - 2)
return 1;
p += 2;
l -= 2;
len -= 2;
/* MECH */
if (l != oid->length || memcmp(p, oid->elements, oid->length) != 0)
return 1;
len -= l;
p += l;
/* MECHNAME_LEN */
if (len < 4)
return 1;
l = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
len -= 4;
p += 4;
/* MECH NAME */
if (len != l)
return 1;
*name = malloc(l + 1);
INSIST(*name != NULL);
memcpy(*name, p, l);
(*name)[l] = '\0';
return 0;
}
static void
gss_error(krb5_context contextp,
gss_OID mech, OM_uint32 type, OM_uint32 error)
{
OM_uint32 new_stat;
OM_uint32 msg_ctx = 0;
gss_buffer_desc status_string;
OM_uint32 ret;
do {
ret = gss_display_status (&new_stat,
error,
type,
mech,
&msg_ctx,
&status_string);
krb5_warnx(contextp, "%.*s",
(int)status_string.length,
(char *)status_string.value);
gss_release_buffer (&new_stat, &status_string);
} while (!GSS_ERROR(ret) && msg_ctx != 0);
}
static void
gss_print_errors (krb5_context contextp,
OM_uint32 maj_stat, OM_uint32 min_stat)
{
gss_error(contextp, GSS_C_NO_OID, GSS_C_GSS_CODE, maj_stat);
gss_error(contextp, GSS_C_NO_OID, GSS_C_MECH_CODE, min_stat);
}
static int
read_data(krb5_storage *sp, krb5_storage *msg, size_t len)
{
char buf[1024];
while (len) {
size_t tlen = len;
ssize_t slen;
if (tlen > sizeof(buf))
tlen = sizeof(buf);
slen = krb5_storage_read(sp, buf, tlen);
INSIST((size_t)slen == tlen);
slen = krb5_storage_write(msg, buf, tlen);
INSIST((size_t)slen == tlen);
len -= tlen;
}
return 0;
}
static int
collect_framents(krb5_storage *sp, krb5_storage *msg)
{
krb5_error_code ret;
uint32_t len;
int last_fragment;
size_t total_len = 0;
do {
ret = krb5_ret_uint32(sp, &len);
if (ret)
return ret;
last_fragment = (len & LAST_FRAGMENT);
len &= ~LAST_FRAGMENT;
CHECK(read_data(sp, msg, len));
total_len += len;
} while(!last_fragment || total_len == 0);
return 0;
}
static krb5_error_code
store_data_xdr(krb5_storage *sp, krb5_data data)
{
krb5_error_code ret;
size_t res;
ret = krb5_store_data(sp, data);
if (ret)
return ret;
res = 4 - (data.length % 4);
if (res != 4) {
static const char zero[4] = { 0, 0, 0, 0 };
ret = krb5_storage_write(sp, zero, res);
if((size_t)ret != res)
return (ret < 0)? errno : krb5_storage_get_eof_code(sp);
}
return 0;
}
static krb5_error_code
ret_data_xdr(krb5_storage *sp, krb5_data *data)
{
krb5_error_code ret;
ret = krb5_ret_data(sp, data);
if (ret)
return ret;
if ((data->length % 4) != 0) {
char buf[4];
size_t res;
res = 4 - (data->length % 4);
if (res != 4) {
ret = krb5_storage_read(sp, buf, res);
if((size_t)ret != res)
return (ret < 0)? errno : krb5_storage_get_eof_code(sp);
}
}
return 0;
}
static krb5_error_code
ret_auth_opaque(krb5_storage *msg, struct opaque_auth *ao)
{
krb5_error_code ret;
ret = krb5_ret_uint32(msg, &ao->flavor);
if (ret) return ret;
ret = ret_data_xdr(msg, &ao->data);
return ret;
}
static int
ret_gcred(krb5_data *data, struct gcred *gcred)
{
krb5_storage *sp;
memset(gcred, 0, sizeof(*gcred));
sp = krb5_storage_from_data(data);
INSIST(sp != NULL);
CHECK(krb5_ret_uint32(sp, &gcred->version));
CHECK(krb5_ret_uint32(sp, &gcred->proc));
CHECK(krb5_ret_uint32(sp, &gcred->seq_num));
CHECK(krb5_ret_uint32(sp, &gcred->service));
CHECK(ret_data_xdr(sp, &gcred->handle));
krb5_storage_free(sp);
return 0;
}
static krb5_error_code
store_gss_init_res(krb5_storage *sp, krb5_data handle,
OM_uint32 maj_stat, OM_uint32 min_stat,
uint32_t seq_window, gss_buffer_t gout)
{
krb5_error_code ret;
krb5_data out;
out.data = gout->value;
out.length = gout->length;
ret = store_data_xdr(sp, handle);
if (ret) return ret;
ret = krb5_store_uint32(sp, maj_stat);
if (ret) return ret;
ret = krb5_store_uint32(sp, min_stat);
if (ret) return ret;
ret = store_data_xdr(sp, out);
return ret;
}
static int
store_string_xdr(krb5_storage *sp, const char *str)
{
krb5_data c;
if (str) {
c.data = rk_UNCONST(str);
c.length = strlen(str) + 1;
} else
krb5_data_zero(&c);
return store_data_xdr(sp, c);
}
static int
ret_string_xdr(krb5_storage *sp, char **str)
{
krb5_data c;
*str = NULL;
CHECK(ret_data_xdr(sp, &c));
if (c.length) {
*str = malloc(c.length + 1);
INSIST(*str != NULL);
memcpy(*str, c.data, c.length);
(*str)[c.length] = '\0';
}
krb5_data_free(&c);
return 0;
}
static int
store_principal_xdr(krb5_context contextp,
krb5_storage *sp,
krb5_principal p)
{
char *str;
CHECK(krb5_unparse_name(contextp, p, &str));
CHECK(store_string_xdr(sp, str));
free(str);
return 0;
}
static int
ret_principal_xdr(krb5_context contextp,
krb5_storage *sp,
krb5_principal *p)
{
char *str;
*p = NULL;
CHECK(ret_string_xdr(sp, &str));
if (str) {
CHECK(krb5_parse_name(contextp, str, p));
free(str);
}
return 0;
}
static int
store_principal_ent(krb5_context contextp,
krb5_storage *sp,
kadm5_principal_ent_rec *ent)
{
int i;
CHECK(store_principal_xdr(contextp, sp, ent->principal));
CHECK(krb5_store_uint32(sp, ent->princ_expire_time));
CHECK(krb5_store_uint32(sp, ent->pw_expiration));
CHECK(krb5_store_uint32(sp, ent->last_pwd_change));
CHECK(krb5_store_uint32(sp, ent->max_life));
CHECK(krb5_store_int32(sp, ent->mod_name == NULL));
if (ent->mod_name)
CHECK(store_principal_xdr(contextp, sp, ent->mod_name));
CHECK(krb5_store_uint32(sp, ent->mod_date));
CHECK(krb5_store_uint32(sp, ent->attributes));
CHECK(krb5_store_uint32(sp, ent->kvno));
CHECK(krb5_store_uint32(sp, ent->mkvno));
CHECK(store_string_xdr(sp, ent->policy));
CHECK(krb5_store_int32(sp, ent->aux_attributes));
CHECK(krb5_store_int32(sp, ent->max_renewable_life));
CHECK(krb5_store_int32(sp, ent->last_success));
CHECK(krb5_store_int32(sp, ent->last_failed));
CHECK(krb5_store_int32(sp, ent->fail_auth_count));
CHECK(krb5_store_int32(sp, ent->n_key_data));
CHECK(krb5_store_int32(sp, ent->n_tl_data));
CHECK(krb5_store_int32(sp, ent->n_tl_data == 0));
if (ent->n_tl_data) {
krb5_tl_data *tp;
for (tp = ent->tl_data; tp; tp = tp->tl_data_next) {
krb5_data c;
c.length = tp->tl_data_length;
c.data = tp->tl_data_contents;
CHECK(krb5_store_int32(sp, 0)); /* last item */
CHECK(krb5_store_int32(sp, tp->tl_data_type));
CHECK(store_data_xdr(sp, c));
}
CHECK(krb5_store_int32(sp, 1)); /* last item */
}
CHECK(krb5_store_int32(sp, ent->n_key_data));
for (i = 0; i < ent->n_key_data; i++) {
CHECK(krb5_store_uint32(sp, 2));
CHECK(krb5_store_uint32(sp, ent->kvno));
CHECK(krb5_store_uint32(sp, ent->key_data[i].key_data_type[0]));
CHECK(krb5_store_uint32(sp, ent->key_data[i].key_data_type[1]));
}
return 0;
}
static int
ret_principal_ent(krb5_context contextp,
krb5_storage *sp,
kadm5_principal_ent_rec *ent)
{
uint32_t flag, num;
size_t i;
memset(ent, 0, sizeof(*ent));
CHECK(ret_principal_xdr(contextp, sp, &ent->principal));
CHECK(krb5_ret_uint32(sp, &flag));
ent->princ_expire_time = flag;
CHECK(krb5_ret_uint32(sp, &flag));
ent->pw_expiration = flag;
CHECK(krb5_ret_uint32(sp, &flag));
ent->last_pwd_change = flag;
CHECK(krb5_ret_uint32(sp, &flag));
ent->max_life = flag;
CHECK(krb5_ret_uint32(sp, &flag));
if (flag == 0)
ret_principal_xdr(contextp, sp, &ent->mod_name);
CHECK(krb5_ret_uint32(sp, &flag));
ent->mod_date = flag;
CHECK(krb5_ret_uint32(sp, &flag));
ent->attributes = flag;
CHECK(krb5_ret_uint32(sp, &flag));
ent->kvno = flag;
CHECK(krb5_ret_uint32(sp, &flag));
ent->mkvno = flag;
CHECK(ret_string_xdr(sp, &ent->policy));
CHECK(krb5_ret_uint32(sp, &flag));
ent->aux_attributes = flag;
CHECK(krb5_ret_uint32(sp, &flag));
ent->max_renewable_life = flag;
CHECK(krb5_ret_uint32(sp, &flag));
ent->last_success = flag;
CHECK(krb5_ret_uint32(sp, &flag));
ent->last_failed = flag;
CHECK(krb5_ret_uint32(sp, &flag));
ent->fail_auth_count = flag;
CHECK(krb5_ret_uint32(sp, &flag));
ent->n_key_data = flag;
CHECK(krb5_ret_uint32(sp, &flag));
ent->n_tl_data = flag;
CHECK(krb5_ret_uint32(sp, &flag));
if (flag == 0) {
krb5_tl_data **tp = &ent->tl_data;
size_t count = 0;
while(1) {
krb5_data c;
CHECK(krb5_ret_uint32(sp, &flag)); /* last item */
if (flag)
break;
*tp = calloc(1, sizeof(**tp));
INSIST(*tp != NULL);
CHECK(krb5_ret_uint32(sp, &flag));
(*tp)->tl_data_type = flag;
CHECK(ret_data_xdr(sp, &c));
(*tp)->tl_data_length = c.length;
(*tp)->tl_data_contents = c.data;
tp = &(*tp)->tl_data_next;
count++;
}
INSIST((size_t)ent->n_tl_data == count);
} else {
INSIST(ent->n_tl_data == 0);
}
CHECK(krb5_ret_uint32(sp, &num));
INSIST(num == (uint32_t)ent->n_key_data);
ent->key_data = calloc(num, sizeof(ent->key_data[0]));
INSIST(ent->key_data != NULL);
for (i = 0; i < num; i++) {
CHECK(krb5_ret_uint32(sp, &flag)); /* data version */
INSIST(flag > 1);
CHECK(krb5_ret_uint32(sp, &flag));
ent->kvno = flag;
CHECK(krb5_ret_uint32(sp, &flag));
ent->key_data[i].key_data_type[0] = flag;
CHECK(krb5_ret_uint32(sp, &flag));
ent->key_data[i].key_data_type[1] = flag;
}
return 0;
}
/*
*
*/
static void
proc_create_principal(kadm5_server_context *contextp,
krb5_storage *in,
krb5_storage *out)
{
uint32_t version, mask;
kadm5_principal_ent_rec ent;
krb5_error_code ret;
char *password;
memset(&ent, 0, sizeof(ent));
CHECK(krb5_ret_uint32(in, &version));
INSIST(version == VERSION2);
CHECK(ret_principal_ent(contextp->context, in, &ent));
CHECK(krb5_ret_uint32(in, &mask));
CHECK(ret_string_xdr(in, &password));
INSIST(ent.principal);
ret = _kadm5_acl_check_permission(contextp, KADM5_PRIV_ADD, ent.principal);
if (ret)
goto fail;
ret = kadm5_create_principal(contextp, &ent, mask, password);
fail:
krb5_warn(contextp->context, ret, "create principal");
CHECK(krb5_store_uint32(out, VERSION2)); /* api version */
CHECK(krb5_store_uint32(out, ret)); /* code */
free(password);
kadm5_free_principal_ent(contextp, &ent);
}
static void
proc_delete_principal(kadm5_server_context *contextp,
krb5_storage *in,
krb5_storage *out)
{
uint32_t version;
krb5_principal princ;
krb5_error_code ret;
CHECK(krb5_ret_uint32(in, &version));
INSIST(version == VERSION2);
CHECK(ret_principal_xdr(contextp->context, in, &princ));
ret = _kadm5_acl_check_permission(contextp, KADM5_PRIV_DELETE, princ);
if (ret)
goto fail;
ret = kadm5_delete_principal(contextp, princ);
fail:
krb5_warn(contextp->context, ret, "delete principal");
CHECK(krb5_store_uint32(out, VERSION2)); /* api version */
CHECK(krb5_store_uint32(out, ret)); /* code */
krb5_free_principal(contextp->context, princ);
}
static void
proc_get_principal(kadm5_server_context *contextp,
krb5_storage *in,
krb5_storage *out)
{
uint32_t version, mask;
krb5_principal princ;
kadm5_principal_ent_rec ent;
krb5_error_code ret;
memset(&ent, 0, sizeof(ent));
CHECK(krb5_ret_uint32(in, &version));
INSIST(version == VERSION2);
CHECK(ret_principal_xdr(contextp->context, in, &princ));
CHECK(krb5_ret_uint32(in, &mask));
ret = _kadm5_acl_check_permission(contextp, KADM5_PRIV_GET, princ);
if(ret)
goto fail;
ret = kadm5_get_principal(contextp, princ, &ent, mask);
fail:
krb5_warn(contextp->context, ret, "get principal principal");
CHECK(krb5_store_uint32(out, VERSION2)); /* api version */
CHECK(krb5_store_uint32(out, ret)); /* code */
if (ret == 0) {
CHECK(store_principal_ent(contextp->context, out, &ent));
}
krb5_free_principal(contextp->context, princ);
kadm5_free_principal_ent(contextp, &ent);
}
static void
proc_chrand_principal_v2(kadm5_server_context *contextp,
krb5_storage *in,
krb5_storage *out)
{
krb5_error_code ret;
krb5_principal princ;
uint32_t version;
krb5_keyblock *new_keys;
int n_keys;
CHECK(krb5_ret_uint32(in, &version));
INSIST(version == VERSION2);
CHECK(ret_principal_xdr(contextp->context, in, &princ));
ret = _kadm5_acl_check_permission(contextp, KADM5_PRIV_CPW, princ);
if(ret)
goto fail;
ret = kadm5_randkey_principal(contextp, princ,
&new_keys, &n_keys);
fail:
krb5_warn(contextp->context, ret, "rand key principal");
CHECK(krb5_store_uint32(out, VERSION2)); /* api version */
CHECK(krb5_store_uint32(out, ret));
if (ret == 0) {
int i;
CHECK(krb5_store_int32(out, n_keys));
for(i = 0; i < n_keys; i++){
CHECK(krb5_store_uint32(out, new_keys[i].keytype));
CHECK(store_data_xdr(out, new_keys[i].keyvalue));
krb5_free_keyblock_contents(contextp->context, &new_keys[i]);
}
free(new_keys);
}
krb5_free_principal(contextp->context, princ);
}
static void
proc_init(kadm5_server_context *contextp,
krb5_storage *in,
krb5_storage *out)
{
CHECK(krb5_store_uint32(out, VERSION2)); /* api version */
CHECK(krb5_store_uint32(out, 0)); /* code */
CHECK(krb5_store_uint32(out, 0)); /* code */
}
struct krb5_proc {
const char *name;
void (*func)(kadm5_server_context *, krb5_storage *, krb5_storage *);
} procs[] = {
{ "NULL", NULL },
{ "create principal", proc_create_principal },
{ "delete principal", proc_delete_principal },
{ "modify principal", NULL },
{ "rename principal", NULL },
{ "get principal", proc_get_principal },
{ "chpass principal", NULL },
{ "chrand principal", proc_chrand_principal_v2 },
{ "create policy", NULL },
{ "delete policy", NULL },
{ "modify policy", NULL },
{ "get policy", NULL },
{ "get privs", NULL },
{ "init", proc_init },
{ "get principals", NULL },
{ "get polices", NULL },
{ "setkey principal", NULL },
{ "setkey principal v4", NULL },
{ "create principal v3", NULL },
{ "chpass principal v3", NULL },
{ "chrand principal v3", NULL },
{ "setkey principal v3", NULL }
};
static krb5_error_code
copyheader(krb5_storage *sp, krb5_data *data)
{
off_t off;
ssize_t sret;
off = krb5_storage_seek(sp, 0, SEEK_CUR);
CHECK(krb5_data_alloc(data, off));
INSIST((size_t)off == data->length);
krb5_storage_seek(sp, 0, SEEK_SET);
sret = krb5_storage_read(sp, data->data, data->length);
INSIST(sret == off);
INSIST(off == krb5_storage_seek(sp, 0, SEEK_CUR));
return 0;
}
struct gctx {
krb5_data handle;
gss_ctx_id_t ctx;
uint32_t seq_num;
int done;
int inprogress;
};
static int
process_stream(krb5_context contextp,
unsigned char *buf, size_t ilen,
krb5_storage *sp)
{
krb5_error_code ret;
krb5_storage *msg, *reply, *dreply;
OM_uint32 maj_stat, min_stat;
gss_buffer_desc gin, gout;
struct gctx gctx;
void *server_handle = NULL;
memset(&gctx, 0, sizeof(gctx));
msg = krb5_storage_emem();
reply = krb5_storage_emem();
dreply = krb5_storage_emem();
/*
* First packet comes partly from the caller
*/
INSIST(ilen >= 4);
while (1) {
struct call_header chdr;
struct gcred gcred;
uint32_t mtype;
krb5_data headercopy;
krb5_storage_truncate(dreply, 0);
krb5_storage_truncate(reply, 0);
krb5_storage_truncate(msg, 0);
krb5_data_zero(&headercopy);
memset(&chdr, 0, sizeof(chdr));
memset(&gcred, 0, sizeof(gcred));
/*
* This is very icky to handle the the auto-detection between
* the Heimdal protocol and the MIT ONC-RPC based protocol.
*/
if (ilen) {
int last_fragment;
unsigned long len;
ssize_t slen;
unsigned char tmp[4];
if (ilen < 4) {
memcpy(tmp, buf, ilen);
slen = krb5_storage_read(sp, tmp + ilen, sizeof(tmp) - ilen);
INSIST((size_t)slen == sizeof(tmp) - ilen);
ilen = sizeof(tmp);
buf = tmp;
}
INSIST(ilen >= 4);
_krb5_get_int(buf, &len, 4);
last_fragment = (len & LAST_FRAGMENT) != 0;
len &= ~LAST_FRAGMENT;
ilen -= 4;
buf += 4;
if (ilen) {
if (len < ilen) {
slen = krb5_storage_write(msg, buf, len);
INSIST((size_t)slen == len);
ilen -= len;
len = 0;
} else {
slen = krb5_storage_write(msg, buf, ilen);
INSIST((size_t)slen == ilen);
len -= ilen;
}
}
CHECK(read_data(sp, msg, len));
if (!last_fragment) {
ret = collect_framents(sp, msg);
if (ret == HEIM_ERR_EOF)
krb5_errx(contextp, 0, "client disconnected");
INSIST(ret == 0);
}
} else {
ret = collect_framents(sp, msg);
if (ret == HEIM_ERR_EOF)
krb5_errx(contextp, 0, "client disconnected");
INSIST(ret == 0);
}
krb5_storage_seek(msg, 0, SEEK_SET);
CHECK(krb5_ret_uint32(msg, &chdr.xid));
CHECK(krb5_ret_uint32(msg, &mtype));
CHECK(krb5_ret_uint32(msg, &chdr.rpcvers));
CHECK(krb5_ret_uint32(msg, &chdr.prog));
CHECK(krb5_ret_uint32(msg, &chdr.vers));
CHECK(krb5_ret_uint32(msg, &chdr.proc));
CHECK(ret_auth_opaque(msg, &chdr.cred));
CHECK(copyheader(msg, &headercopy));
CHECK(ret_auth_opaque(msg, &chdr.verf));
INSIST(chdr.rpcvers == RPC_VERSION);
INSIST(chdr.prog == KADM_SERVER);
INSIST(chdr.vers == VVERSION);
INSIST(chdr.cred.flavor == FLAVOR_GSS);
CHECK(ret_gcred(&chdr.cred.data, &gcred));
INSIST(gcred.version == FLAVOR_GSS_VERSION);
if (gctx.done) {
INSIST(chdr.verf.flavor == FLAVOR_GSS);
/* from first byte to last of credential */
gin.value = headercopy.data;
gin.length = headercopy.length;
gout.value = chdr.verf.data.data;
gout.length = chdr.verf.data.length;
maj_stat = gss_verify_mic(&min_stat, gctx.ctx, &gin, &gout, NULL);
INSIST(maj_stat == GSS_S_COMPLETE);
}
switch(gcred.proc) {
case RPG_DATA: {
krb5_data data;
int conf_state;
uint32_t seq;
krb5_storage *sp1;
INSIST(gcred.service == rpg_privacy);
INSIST(gctx.done);
INSIST(krb5_data_cmp(&gcred.handle, &gctx.handle) == 0);
CHECK(ret_data_xdr(msg, &data));
gin.value = data.data;
gin.length = data.length;
maj_stat = gss_unwrap(&min_stat, gctx.ctx, &gin, &gout,
&conf_state, NULL);
krb5_data_free(&data);
INSIST(maj_stat == GSS_S_COMPLETE);
INSIST(conf_state != 0);
sp1 = krb5_storage_from_mem(gout.value, gout.length);
INSIST(sp1 != NULL);
CHECK(krb5_ret_uint32(sp1, &seq));
INSIST (seq == gcred.seq_num);
/*
* Check sequence number
*/
INSIST(seq > gctx.seq_num);
gctx.seq_num = seq;
/*
* If contextp is setup, priv data have the seq_num stored
* first in the block, so add it here before users data is
* added.
*/
CHECK(krb5_store_uint32(dreply, gctx.seq_num));
if (chdr.proc >= sizeof(procs)/sizeof(procs[0])) {
krb5_warnx(contextp, "proc number out of array");
} else if (procs[chdr.proc].func == NULL) {
krb5_warnx(contextp, "proc '%s' never implemented",
procs[chdr.proc].name);
} else {
krb5_warnx(contextp, "proc %s", procs[chdr.proc].name);
INSIST(server_handle != NULL);
(*procs[chdr.proc].func)(server_handle, sp, dreply);
}
krb5_storage_free(sp);
gss_release_buffer(&min_stat, &gout);
break;
}
case RPG_INIT:
INSIST(gctx.inprogress == 0);
INSIST(gctx.ctx == NULL);
gctx.inprogress = 1;
/* FALL THOUGH */
case RPG_CONTINUE_INIT: {
gss_name_t src_name = GSS_C_NO_NAME;
krb5_data in;
INSIST(gctx.inprogress);
CHECK(ret_data_xdr(msg, &in));
gin.value = in.data;
gin.length = in.length;
gout.value = NULL;
gout.length = 0;
maj_stat = gss_accept_sec_context(&min_stat,
&gctx.ctx,
GSS_C_NO_CREDENTIAL,
&gin,
GSS_C_NO_CHANNEL_BINDINGS,
&src_name,
NULL,
&gout,
NULL,
NULL,
NULL);
if (GSS_ERROR(maj_stat)) {
gss_print_errors(contextp, maj_stat, min_stat);
krb5_errx(contextp, 1, "gss error, exit");
}
if ((maj_stat & GSS_S_CONTINUE_NEEDED) == 0) {
kadm5_config_params realm_params;
gss_buffer_desc bufp;
char *client;
gctx.done = 1;
memset(&realm_params, 0, sizeof(realm_params));
maj_stat = gss_export_name(&min_stat, src_name, &bufp);
INSIST(maj_stat == GSS_S_COMPLETE);
CHECK(parse_name(bufp.value, bufp.length,
GSS_KRB5_MECHANISM, &client));
gss_release_buffer(&min_stat, &bufp);
krb5_warnx(contextp, "%s connected", client);
ret = kadm5_s_init_with_password_ctx(contextp,
client,
NULL,
KADM5_ADMIN_SERVICE,
&realm_params,
0, 0,
&server_handle);
INSIST(ret == 0);
}
INSIST(gctx.ctx != GSS_C_NO_CONTEXT);
CHECK(krb5_store_uint32(dreply, 0));
CHECK(store_gss_init_res(dreply, gctx.handle,
maj_stat, min_stat, 1, &gout));
if (gout.value)
gss_release_buffer(&min_stat, &gout);
if (src_name)
gss_release_name(&min_stat, &src_name);
break;
}
case RPG_DESTROY:
krb5_errx(contextp, 1, "client destroyed gss contextp");
default:
krb5_errx(contextp, 1, "client sent unknown gsscode %d",
(int)gcred.proc);
}
krb5_data_free(&gcred.handle);
krb5_data_free(&chdr.cred.data);
krb5_data_free(&chdr.verf.data);
krb5_data_free(&headercopy);
CHECK(krb5_store_uint32(reply, chdr.xid));
CHECK(krb5_store_uint32(reply, 1)); /* REPLY */
CHECK(krb5_store_uint32(reply, 0)); /* MSG_ACCEPTED */
if (!gctx.done) {
krb5_data data;
CHECK(krb5_store_uint32(reply, 0)); /* flavor_none */
CHECK(krb5_store_uint32(reply, 0)); /* length */
CHECK(krb5_store_uint32(reply, 0)); /* SUCCESS */
CHECK(krb5_storage_to_data(dreply, &data));
INSIST((size_t)krb5_storage_write(reply, data.data, data.length) == data.length);
krb5_data_free(&data);
} else {
uint32_t seqnum = htonl(gctx.seq_num);
krb5_data data;
gin.value = &seqnum;
gin.length = sizeof(seqnum);
maj_stat = gss_get_mic(&min_stat, gctx.ctx, 0, &gin, &gout);
INSIST(maj_stat == GSS_S_COMPLETE);
data.data = gout.value;
data.length = gout.length;
CHECK(krb5_store_uint32(reply, FLAVOR_GSS));
CHECK(store_data_xdr(reply, data));
gss_release_buffer(&min_stat, &gout);
CHECK(krb5_store_uint32(reply, 0)); /* SUCCESS */
CHECK(krb5_storage_to_data(dreply, &data));
if (gctx.inprogress) {
ssize_t sret;
gctx.inprogress = 0;
sret = krb5_storage_write(reply, data.data, data.length);
INSIST((size_t)sret == data.length);
krb5_data_free(&data);
} else {
int conf_state;
gin.value = data.data;
gin.length = data.length;
maj_stat = gss_wrap(&min_stat, gctx.ctx, 1, 0,
&gin, &conf_state, &gout);
INSIST(maj_stat == GSS_S_COMPLETE);
INSIST(conf_state != 0);
krb5_data_free(&data);
data.data = gout.value;
data.length = gout.length;
store_data_xdr(reply, data);
gss_release_buffer(&min_stat, &gout);
}
}
{
krb5_data data;
ssize_t sret;
CHECK(krb5_storage_to_data(reply, &data));
CHECK(krb5_store_uint32(sp, data.length | LAST_FRAGMENT));
sret = krb5_storage_write(sp, data.data, data.length);
INSIST((size_t)sret == data.length);
krb5_data_free(&data);
}
}
}
int
handle_mit(krb5_context contextp, void *buf, size_t len, krb5_socket_t sock)
{
krb5_storage *sp;
dcontext = contextp;
sp = krb5_storage_from_fd(sock);
INSIST(sp != NULL);
process_stream(contextp, buf, len, sp);
return 0;
}
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