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Changes to the Kerberos SSL code by Jeffrey Altman <jaltman@columbia.edu>

Browse Source 
His comments are:

 . adds use of replay cache to protect against replay attacks

 . adds functions kssl_tgt_is_available() and
   kssl_keytab_is_available() which are used within s3_lib.c
   and ssl_lib.c to determine at runtime whether or not
   KRB5 ciphers can be supported during the current session.
This commit is contained in:
Richard Levitte 2001-07-11 19:03:58 +00:00
parent af436bc158
commit a5224c3420
4 changed files with 213 additions and 6 deletions
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203
ssl/kssl.c
View File

@ -71,7 +71,6 @@
#define _XOPEN_SOURCE /* glibc2 needs this to declare strptime() */
#include <time.h>
#include <string.h>
#include <ctype.h>
#include <openssl/ssl.h>
#include <openssl/evp.h>
@ -127,6 +126,9 @@
#define valid_cksumtype kssl_valid_cksumtype
#define krb5_checksum_size kssl_krb5_checksum_size
#define krb5_kt_free_entry kssl_krb5_kt_free_entry
#define krb5_auth_con_setrcache kssl_krb5_auth_con_setrcache
#define krb5_auth_con_getrcache kssl_krb5_auth_con_getrcache
#define krb5_get_server_rcache kssl_krb5_get_server_rcache
/* Prototypes for built in stubs */
void kssl_krb5_free_data_contents(krb5_context, krb5_data *);
@ -172,6 +174,15 @@ krb5_error_code kssl_krb5_auth_con_free(krb5_context,krb5_auth_context);
size_t kssl_krb5_checksum_size(krb5_context context,krb5_cksumtype ctype);
krb5_boolean kssl_valid_cksumtype(krb5_cksumtype ctype);
krb5_error_code krb5_kt_free_entry(krb5_context,krb5_keytab_entry FAR * );
krb5_error_code kssl_krb5_auth_con_setrcache(krb5_context,
krb5_auth_context,
krb5_rcache);
krb5_error_code kssl_krb5_get_server_rcache(krb5_context,
krb5_const krb5_data *,
krb5_rcache *);
krb5_error_code kssl_krb5_auth_con_getrcache(krb5_context,
krb5_auth_context,
krb5_rcache *);
/* Function pointers (almost all Kerberos functions are _stdcall) */
static void (_stdcall *p_krb5_free_data_contents)(krb5_context, krb5_data *)
@ -232,6 +243,15 @@ static size_t (_stdcall *p_krb5_checksum_size)(krb5_context context,krb5_cksumty
static krb5_boolean (_stdcall *p_valid_cksumtype)(krb5_cksumtype ctype)=NULL;
static krb5_error_code (_stdcall *p_krb5_kt_free_entry)
(krb5_context,krb5_keytab_entry * )=NULL;
static krb5_error_code (_stdcall * p_krb5_auth_con_setrcache)(krb5_context,
krb5_auth_context,
krb5_rcache)=NULL;
static krb5_error_code (_stdcall * p_krb5_get_server_rcache)(krb5_context,
krb5_const krb5_data *,
krb5_rcache *)=NULL;
static krb5_error_code (* p_krb5_auth_con_getrcache)(krb5_context,
krb5_auth_context,
krb5_rcache *)=NULL;
static int krb5_loaded = 0; /* only attempt to initialize func ptrs once */
/* Function to Load the Kerberos 5 DLL and initialize function pointers */
@ -295,6 +315,12 @@ load_krb5_dll(void)
GetProcAddress( hKRB5_32, "krb5_checksum_size" );
(FARPROC) p_krb5_kt_free_entry =
GetProcAddress( hKRB5_32, "krb5_kt_free_entry" );
(FARPROC) p_krb5_auth_con_setrcache =
GetProcAddress( hKRB5_32, "krb5_auth_con_setrcache" );
(FARPROC) p_krb5_get_server_rcache =
GetProcAddress( hKRB5_32, "krb5_get_server_rcache" );
(FARPROC) p_krb5_auth_con_getrcache =
GetProcAddress( hKRB5_32, "krb5_auth_con_getrcache" );
}
/* Stubs for each function to be dynamicly loaded */
@ -666,7 +692,36 @@ kssl_krb5_cc_get_principal
return(krb5_x
((cache)->ops->get_princ,(context, cache, principal)));
}
#else
krb5_error_code
kssl_krb5_auth_con_setrcache(krb5_context con, krb5_auth_context acon,
krb5_rcache rcache)
{
if ( p_krb5_auth_con_setrcache )
return(p_krb5_auth_con_setrcache(con,acon,rcache));
else
return KRB5KRB_ERR_GENERIC;
}
krb5_error_code
kssl_krb5_get_server_rcache(krb5_context con, krb5_const krb5_data * data,
krb5_rcache * rcache)
{
if ( p_krb5_get_server_rcache )
return(p_krb5_get_server_rcache(con,data,rcache));
else
return KRB5KRB_ERR_GENERIC;
}
krb5_error_code
kssl_krb5_auth_con_getrcache(krb5_context con, krb5_auth_context acon,
krb5_rcache * prcache)
{
if ( p_krb5_auth_con_getrcache )
return(p_krb5_auth_con_getrcache(con,acon, prcache));
else
return KRB5KRB_ERR_GENERIC;
}
#endif /* OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32 */
char
@ -1064,7 +1119,7 @@ kssl_cget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx,
if (ap_req) KRB5_APREQ_free((KRB5_APREQ *) ap_req);
if (krb5_app_req.length)
krb5_free_data_contents(krb5context,&krb5_app_req);
kssl_krb5_free_data_contents(krb5context,&krb5_app_req);
}
#ifdef KRB5_HEIMDAL
if (kssl_ctx_setkey(kssl_ctx, &krb5credsp->session))
@ -1204,13 +1259,14 @@ kssl_sget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx,
krb5_keytab krb5keytab = NULL;
krb5_keytab_entry kt_entry;
krb5_principal krb5server;
krb5_rcache rcache = NULL;
kssl_err_set(kssl_err, 0, "");
if (!kssl_ctx)
{
kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
"No kssl_ctx defined.\n");
"No kssl_ctx defined.\n");
goto err;
}
@ -1240,6 +1296,15 @@ kssl_sget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx,
goto err;
}
if ((krb5rc = krb5_auth_con_getrcache(krb5context, krb5auth_context,
&rcache)))
{
kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
"krb5_auth_con_getrcache() fails.\n");
goto err;
}
if ((krb5rc = krb5_sname_to_principal(krb5context, NULL,
(kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
KRB5_NT_SRV_HST, &krb5server)) != 0)
@ -1249,6 +1314,26 @@ kssl_sget_tkt( /* UPDATE */ KSSL_CTX *kssl_ctx,
goto err;
}
if (rcache == NULL)
{
if ((krb5rc = krb5_get_server_rcache(krb5context,
krb5_princ_component(krb5context, krb5server, 0),
&rcache)))
{
kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
"krb5_get_server_rcache() fails.\n");
goto err;
}
}
if ((krb5rc = krb5_auth_con_setrcache(krb5context, krb5auth_context, rcache)))
{
kssl_err_set(kssl_err, SSL_R_KRB5_S_INIT,
"krb5_auth_con_setrcache() fails.\n");
goto err;
}
/* kssl_ctx->keytab_file == NULL ==> use Kerberos default
*/
if (kssl_ctx->keytab_file)
@ -1569,7 +1654,7 @@ kssl_ctx_setkey(KSSL_CTX *kssl_ctx, krb5_keyblock *session)
void
kssl_ctx_show(KSSL_CTX *kssl_ctx)
{
unsigned int i;
int i;
printf("kssl_ctx: ");
if (kssl_ctx == NULL)
@ -1599,12 +1684,118 @@ kssl_ctx_show(KSSL_CTX *kssl_ctx)
return;
}
int
kssl_keytab_is_available(KSSL_CTX *kssl_ctx)
{
krb5_context krb5context = NULL;
krb5_keytab krb5keytab = NULL;
krb5_keytab_entry entry;
krb5_principal princ = NULL;
krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
int rc = 0;
if ((krb5rc = krb5_init_context(&krb5context)))
return(0);
/* kssl_ctx->keytab_file == NULL ==> use Kerberos default
*/
if (kssl_ctx->keytab_file)
{
krb5rc = krb5_kt_resolve(krb5context, kssl_ctx->keytab_file,
&krb5keytab);
if (krb5rc)
goto exit;
}
else
{
krb5rc = krb5_kt_default(krb5context,&krb5keytab);
if (krb5rc)
goto exit;
}
/* the host key we are looking for */
krb5rc = krb5_sname_to_principal(krb5context, NULL,
kssl_ctx->service_name ? kssl_ctx->service_name: KRB5SVC,
KRB5_NT_SRV_HST, &princ);
krb5rc = krb5_kt_get_entry(krb5context, krb5keytab,
princ,
0 /* IGNORE_VNO */,
0 /* IGNORE_ENCTYPE */,
&entry);
if ( krb5rc == KRB5_KT_NOTFOUND ) {
rc = 1;
goto exit;
} else if ( krb5rc )
goto exit;
krb5_kt_free_entry(krb5context, &entry);
rc = 1;
exit:
if (krb5keytab) krb5_kt_close(krb5context, krb5keytab);
if (princ) krb5_free_principal(krb5context, princ);
if (krb5context) krb5_free_context(krb5context);
return(rc);
}
int
kssl_tgt_is_available(KSSL_CTX *kssl_ctx)
{
krb5_error_code krb5rc = KRB5KRB_ERR_GENERIC;
krb5_context krb5context = NULL;
krb5_ccache krb5ccdef = NULL;
krb5_creds krb5creds, *krb5credsp = NULL;
int rc = 0;
memset((char *)&krb5creds, 0, sizeof(krb5creds));
if (!kssl_ctx)
return(0);
if (!kssl_ctx->service_host)
return(0);
if ((krb5rc = krb5_init_context(&krb5context)) != 0)
goto err;
if ((krb5rc = krb5_sname_to_principal(krb5context,
kssl_ctx->service_host,
(kssl_ctx->service_name)? kssl_ctx->service_name: KRB5SVC,
KRB5_NT_SRV_HST, &krb5creds.server)) != 0)
goto err;
if ((krb5rc = krb5_cc_default(krb5context, &krb5ccdef)) != 0)
goto err;
if ((krb5rc = krb5_cc_get_principal(krb5context, krb5ccdef,
&krb5creds.client)) != 0)
goto err;
if ((krb5rc = krb5_get_credentials(krb5context, 0, krb5ccdef,
&krb5creds, &krb5credsp)) != 0)
goto err;
rc = 1;
err:
#ifdef KSSL_DEBUG
kssl_ctx_show(kssl_ctx);
#endif /* KSSL_DEBUG */
if (krb5creds.client) krb5_free_principal(krb5context, krb5creds.client);
if (krb5creds.server) krb5_free_principal(krb5context, krb5creds.server);
if (krb5context) krb5_free_context(krb5context);
return(rc);
}
#if !defined(OPENSSL_SYS_WINDOWS) && !defined(OPENSSL_SYS_WIN32)
void kssl_krb5_free_data_contents(krb5_context context, krb5_data *data)
{
#ifdef KRB5_HEIMDAL
data->length = 0;
free(data->if (data->data) data);
if (data->data)
free(data->data);
#elif defined(KRB5_MIT_OLD11)
if (data->data) {
krb5_xfree(data->data);

2
ssl/kssl.h
View File

@ -152,6 +152,8 @@ char *knumber(int len, krb5_octet *contents);
EVP_CIPHER *kssl_map_enc(krb5_enctype enctype);
int kssl_keytab_is_available(KSSL_CTX *kssl_ctx);
int kssl_tgt_is_available(KSSL_CTX *kssl_ctx);
/* Public (for use by applications that use OpenSSL with Kerberos 5 support */
krb5_error_code kssl_ctx_setstring(KSSL_CTX *kssl_ctx, int which, char *text);

7
ssl/s3_lib.c
View File

@ -1423,6 +1423,13 @@ SSL_CIPHER *ssl3_choose_cipher(SSL *s, STACK_OF(SSL_CIPHER) *clnt,
#endif /* KSSL_DEBUG */
alg=c->algorithms&(SSL_MKEY_MASK|SSL_AUTH_MASK);
#ifndef OPENSSL_NO_KRB5
if (alg & SSL_KRB5)
{
if ( !kssl_keytab_is_available(s->kssl_ctx) )
continue;
}
#endif /* OPENSSL_NO_KRB5 */
if (SSL_C_IS_EXPORT(c))
{
ok=((alg & emask) == alg)?1:0;

7
ssl/ssl_lib.c
View File

@ -1058,6 +1058,9 @@ int ssl_cipher_list_to_bytes(SSL *s,STACK_OF(SSL_CIPHER) *sk,unsigned char *p)
int i,j=0;
SSL_CIPHER *c;
unsigned char *q;
#ifndef OPENSSL_NO_KRB5
int nokrb5 = !kssl_tgt_is_available(s->kssl_ctx);
#endif /* OPENSSL_NO_KRB5 */
if (sk == NULL) return(0);
q=p;
@ -1065,6 +1068,10 @@ int ssl_cipher_list_to_bytes(SSL *s,STACK_OF(SSL_CIPHER) *sk,unsigned char *p)
for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
{
c=sk_SSL_CIPHER_value(sk,i);
#ifndef OPENSSL_NO_KRB5
if ((c->algorithms & SSL_KRB5) && nokrb5)
continue;
#endif /* OPENSSL_NO_KRB5 */
j=ssl_put_cipher_by_char(s,c,p);
p+=j;
}