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Add support for arbitrary TLS extensions.

Browse source 
Contributed by Trevor Perrin.
This commit is contained in:
Trevor 2013-05-12 18:55:27 -07:00 committed by Ben Laurie
parent 6d84daa5d6
commit a398f821fa
17 changed files with 791 additions and 5 deletions
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3
CHANGES
View file

@ -4,6 +4,9 @@
Changes between 1.0.x and 1.1.0 [xx XXX xxxx]
*) Add callbacks for arbitrary TLS extensions.
[Trevor Perrin <trevp@trevp.net> and Ben Laurie]
*) Support for DTLS 1.2. This adds two sets of DTLS methods: DTLS_*_method()
supports both DTLS 1.2 and 1.0 and should use whatever version the peer
supports and DTLSv1_2_*_method() which supports DTLS 1.2 only.

62
apps/s_client.c
View file

@ -365,6 +365,9 @@ static void sc_usage(void)
# ifndef OPENSSL_NO_NEXTPROTONEG
BIO_printf(bio_err," -nextprotoneg arg - enable NPN extension, considering named protocols supported (comma-separated list)\n");
# endif
#ifndef OPENSSL_NO_TLSEXT
BIO_printf(bio_err," -serverinfo types - send empty ClientHello extensions (comma-separated numbers)\n");
#endif
#endif
BIO_printf(bio_err," -legacy_renegotiation - enable use of legacy renegotiation (dangerous)\n");
BIO_printf(bio_err," -use_srtp profiles - Offer SRTP key management with a colon-separated profile list\n");
@ -542,6 +545,26 @@ static int next_proto_cb(SSL *s, unsigned char **out, unsigned char *outlen, con
return SSL_TLSEXT_ERR_OK;
}
# endif /* ndef OPENSSL_NO_NEXTPROTONEG */
static int serverinfo_cli_cb(SSL* s, unsigned short ext_type,
const unsigned char* in, unsigned short inlen,
int* al, void* arg)
{
char pem_name[100];
unsigned char ext_buf[4 + 65536];
/* Reconstruct the type/len fields prior to extension data */
ext_buf[0] = ext_type >> 8;
ext_buf[1] = ext_type & 0xFF;
ext_buf[2] = inlen >> 8;
ext_buf[3] = inlen & 0xFF;
memcpy(ext_buf+4, in, inlen);
BIO_snprintf(pem_name, sizeof(pem_name), "SERVER_INFO %d", ext_type);
PEM_write_bio(bio_c_out, pem_name, "", ext_buf, 4 + inlen);
return 1;
}
#endif
enum
@ -614,6 +637,9 @@ int MAIN(int argc, char **argv)
# ifndef OPENSSL_NO_NEXTPROTONEG
const char *next_proto_neg_in = NULL;
# endif
# define MAX_SI_TYPES 100
unsigned short serverinfo_types[MAX_SI_TYPES];
int serverinfo_types_count = 0;
#endif
char *sess_in = NULL;
char *sess_out = NULL;
@ -968,6 +994,29 @@ static char *jpake_secret = NULL;
next_proto_neg_in = *(++argv);
}
# endif
else if (strcmp(*argv,"-serverinfo") == 0)
{
char *c;
int start = 0;
int len;
if (--argc < 1) goto bad;
c = *(++argv);
serverinfo_types_count = 0;
len = strlen(c);
for (i = 0; i <= len; ++i)
{
if (i == len || c[i] == ',')
{
serverinfo_types[serverinfo_types_count]
= atoi(c+start);
serverinfo_types_count++;
start = i+1;
}
if (serverinfo_types_count == MAX_SI_TYPES)
break;
}
}
#endif
#ifdef FIONBIO
else if (strcmp(*argv,"-nbio") == 0)
@ -1261,6 +1310,19 @@ bad:
if (next_proto.data)
SSL_CTX_set_next_proto_select_cb(ctx, next_proto_cb, &next_proto);
#endif
#ifndef OPENSSL_NO_TLSEXT
if (serverinfo_types_count)
{
for (i = 0; i < serverinfo_types_count; i++)
{
SSL_CTX_set_custom_cli_ext(ctx,
serverinfo_types[i],
NULL,
serverinfo_cli_cb,
NULL);
}
}
#endif
if (state) SSL_CTX_set_info_callback(ctx,apps_ssl_info_callback);
#if 0

15
apps/s_server.c
View file

@ -318,6 +318,8 @@ static int cert_chain = 0;
#ifndef OPENSSL_NO_TLSEXT
static BIO *authz_in = NULL;
static const char *s_authz_file = NULL;
static BIO *serverinfo_in = NULL;
static const char *s_serverinfo_file = NULL;
#endif
#ifndef OPENSSL_NO_PSK
@ -479,6 +481,9 @@ static void sv_usage(void)
BIO_printf(bio_err," -cert arg - certificate file to use\n");
BIO_printf(bio_err," (default is %s)\n",TEST_CERT);
BIO_printf(bio_err," -authz arg - binary authz file for certificate\n");
#ifndef OPENSSL_NO_TLSEXT
BIO_printf(bio_err," -serverinfo arg - PEM serverinfo file for certificate\n");
#endif
BIO_printf(bio_err," -crl_check - check the peer certificate has not been revoked by its CA.\n" \
" The CRL(s) are appended to the certificate file\n");
BIO_printf(bio_err," -crl_check_all - check the peer certificate has not been revoked by its CA\n" \
@ -1093,6 +1098,11 @@ int MAIN(int argc, char *argv[])
if (--argc < 1) goto bad;
s_authz_file = *(++argv);
}
else if (strcmp(*argv,"-serverinfo") == 0)
{
if (--argc < 1) goto bad;
s_serverinfo_file = *(++argv);
}
#endif
else if (strcmp(*argv,"-certform") == 0)
{
@ -1853,6 +1863,9 @@ bad:
#ifndef OPENSSL_NO_TLSEXT
if (s_authz_file != NULL && !SSL_CTX_use_authz_file(ctx, s_authz_file))
goto end;
if (s_serverinfo_file != NULL
&& !SSL_CTX_use_serverinfo_file(ctx, s_serverinfo_file))
goto end;
#endif
#ifndef OPENSSL_NO_TLSEXT
if (ctx2 && !set_cert_key_stuff(ctx2,s_cert2,s_key2, NULL, build_chain))
@ -2032,6 +2045,8 @@ end:
EVP_PKEY_free(s_key2);
if (authz_in != NULL)
BIO_free(authz_in);
if (serverinfo_in != NULL)
BIO_free(serverinfo_in);
#endif
ssl_excert_free(exc);
if (ssl_args)

8
ssl/s3_lib.c
View file

@ -3026,6 +3026,8 @@ void ssl3_free(SSL *s)
#ifndef OPENSSL_NO_TLSEXT
if (s->s3->tlsext_authz_client_types != NULL)
OPENSSL_free(s->s3->tlsext_authz_client_types);
if (s->s3->tlsext_custom_types != NULL)
OPENSSL_free(s->s3->tlsext_custom_types);
#endif
OPENSSL_cleanse(s->s3,sizeof *s->s3);
OPENSSL_free(s->s3);
@ -3076,6 +3078,12 @@ void ssl3_clear(SSL *s)
OPENSSL_free(s->s3->tlsext_authz_client_types);
s->s3->tlsext_authz_client_types = NULL;
}
if (s->s3->tlsext_custom_types != NULL)
{
OPENSSL_free(s->s3->tlsext_custom_types);
s->s3->tlsext_custom_types = NULL;
}
s->s3->tlsext_custom_types_count = 0;
#endif
rp = s->s3->rbuf.buf;

94
ssl/ssl.h
View file

@ -383,6 +383,56 @@ DECLARE_STACK_OF(SRTP_PROTECTION_PROFILE)
typedef int (*tls_session_ticket_ext_cb_fn)(SSL *s, const unsigned char *data, int len, void *arg);
typedef int (*tls_session_secret_cb_fn)(SSL *s, void *secret, int *secret_len, STACK_OF(SSL_CIPHER) *peer_ciphers, SSL_CIPHER **cipher, void *arg);
#ifndef OPENSSL_NO_TLSEXT
/* Callbacks and structures for handling custom TLS Extensions:
* cli_ext_first_cb - sends data for ClientHello TLS Extension
* cli_ext_second_cb - receives data from ServerHello TLS Extension
* srv_ext_first_cb - receives data from ClientHello TLS Extension
* srv_ext_second_cb - sends data for ServerHello TLS Extension
*
* All these functions return nonzero on success. Zero will terminate
* the handshake (and return a specific TLS Fatal alert, if the function
* declaration has an "al" parameter).
*
* "ext_type" is a TLS "ExtensionType" from 0-65535.
* "in" is a pointer to TLS "extension_data" being provided to the cb.
* "out" is used by the callback to return a pointer to "extension data"
* which OpenSSL will later copy into the TLS handshake. The contents
* of this buffer should not be changed until the handshake is complete.
* "inlen" and "outlen" are TLS Extension lengths from 0-65535.
* "al" is a TLS "AlertDescription" from 0-255 which WILL be sent as a
* fatal TLS alert, if the callback returns zero.
*/
typedef int (*custom_cli_ext_first_cb_fn)(SSL *s, unsigned short ext_type,
const unsigned char **out,
unsigned short *outlen, void *arg);
typedef int (*custom_cli_ext_second_cb_fn)(SSL *s, unsigned short ext_type,
const unsigned char *in,
unsigned short inlen, int *al,
void *arg);
typedef int (*custom_srv_ext_first_cb_fn)(SSL *s, unsigned short ext_type,
const unsigned char *in,
unsigned short inlen, int *al,
void *arg);
typedef int (*custom_srv_ext_second_cb_fn)(SSL *s, unsigned short ext_type,
const unsigned char **out,
unsigned short *outlen, void *arg);
typedef struct {
unsigned short ext_type;
custom_cli_ext_first_cb_fn fn1;
custom_cli_ext_second_cb_fn fn2;
void *arg;
} custom_cli_ext_record;
typedef struct {
unsigned short ext_type;
custom_srv_ext_first_cb_fn fn1;
custom_srv_ext_second_cb_fn fn2;
void *arg;
} custom_srv_ext_record;
#endif
#ifndef OPENSSL_NO_SSL_INTERN
@ -1064,6 +1114,12 @@ struct ssl_ctx_st
# endif /* OPENSSL_NO_EC */
int (*tlsext_authz_server_audit_proof_cb)(SSL *s, void *arg);
void *tlsext_authz_server_audit_proof_cb_arg;
/* Arrays containing the callbacks for custom TLS Extensions. */
custom_cli_ext_record *custom_cli_ext_records;
size_t custom_cli_ext_records_count;
custom_srv_ext_record *custom_srv_ext_records;
size_t custom_srv_ext_records_count;
};
#endif
@ -1170,6 +1226,33 @@ const char *SSL_get_psk_identity_hint(const SSL *s);
const char *SSL_get_psk_identity(const SSL *s);
#endif
#ifndef OPENSSL_NO_TLSEXT
/* Register callbacks to handle custom TLS Extensions as client or server.
*
* Returns nonzero on success. You cannot register twice for the same
* extension number, and registering for an extension number already
* handled by OpenSSL will succeed, but the callbacks will not be invoked.
*
* NULL can be registered for any callback function. For the client
* functions, a NULL custom_cli_ext_first_cb_fn sends an empty ClientHello
* Extension, and a NULL custom_cli_ext_second_cb_fn ignores the ServerHello
* response (if any).
*
* For the server functions, a NULL custom_srv_ext_first_cb_fn means the
* ClientHello extension's data will be ignored, but the extension will still
* be noted and custom_srv_ext_second_cb_fn will still be invoked. If
* custom_srv_ext_second_cb_fn is NULL, an empty ServerHello extension is
* sent.
*/
int SSL_CTX_set_custom_cli_ext(SSL_CTX *ctx, unsigned short ext_type,
custom_cli_ext_first_cb_fn fn1,
custom_cli_ext_second_cb_fn fn2, void *arg);
int SSL_CTX_set_custom_srv_ext(SSL_CTX *ctx, unsigned short ext_type,
custom_srv_ext_first_cb_fn fn1,
custom_srv_ext_second_cb_fn fn2, void *arg);
#endif
#define SSL_NOTHING 1
#define SSL_WRITING 2
#define SSL_READING 3
@ -1934,6 +2017,14 @@ const unsigned char *SSL_CTX_get_authz_data(SSL_CTX *ctx, unsigned char type,
int SSL_CTX_use_authz_file(SSL_CTX *ctx, const char *file);
int SSL_use_authz_file(SSL *ssl, const char *file);
#endif
/* Set serverinfo data for the current active cert. */
int SSL_CTX_use_serverinfo(SSL_CTX *ctx, const unsigned char *serverinfo,
size_t serverinfo_length);
#ifndef OPENSSL_NO_STDIO
int SSL_CTX_use_serverinfo_file(SSL_CTX *ctx, const char *file);
#endif /* NO_STDIO */
#endif
#ifndef OPENSSL_NO_STDIO
@ -2481,6 +2572,8 @@ void ERR_load_SSL_strings(void);
#define SSL_F_SSL_CTX_USE_RSAPRIVATEKEY 177
#define SSL_F_SSL_CTX_USE_RSAPRIVATEKEY_ASN1 178
#define SSL_F_SSL_CTX_USE_RSAPRIVATEKEY_FILE 179
#define SSL_F_SSL_CTX_USE_SERVERINFO 336
#define SSL_F_SSL_CTX_USE_SERVERINFO_FILE 337
#define SSL_F_SSL_DO_HANDSHAKE 180
#define SSL_F_SSL_GET_NEW_SESSION 181
#define SSL_F_SSL_GET_PREV_SESSION 217
@ -2655,6 +2748,7 @@ void ERR_load_SSL_strings(void);
#define SSL_R_INVALID_COMPRESSION_ALGORITHM 341
#define SSL_R_INVALID_NULL_CMD_NAME 385
#define SSL_R_INVALID_PURPOSE 278
#define SSL_R_INVALID_SERVERINFO_DATA 388
#define SSL_R_INVALID_SRP_USERNAME 357
#define SSL_R_INVALID_STATUS_RESPONSE 328
#define SSL_R_INVALID_TICKET_KEYS_LENGTH 325

9
ssl/ssl3.h
View file

@ -577,6 +577,15 @@ typedef struct ssl3_state_st
* server echoed our server_authz extension and therefore must send us
* a supplemental data handshake message. */
char tlsext_authz_server_promised;
/* tlsext_custom_types contains an array of TLS Extension types which
* were advertised by the client in its ClientHello, which were not
* otherwise handled by OpenSSL, and which the server has registered
* a custom_srv_ext_record to handle.
* The array does not contain any duplicates, and is in the same order
* as the types were received in the client hello. */
unsigned short *tlsext_custom_types;
size_t tlsext_custom_types_count; /* how many tlsext_custom_types */
#endif
} SSL3_STATE;

31
ssl/ssl_cert.c
View file

@ -329,6 +329,7 @@ CERT *ssl_cert_dup(CERT *cert)
}
}
rpk->valid_flags = 0;
#ifndef OPENSSL_NO_TLSEXT
if (cert->pkeys[i].authz != NULL)
{
/* Just copy everything. */
@ -339,12 +340,30 @@ CERT *ssl_cert_dup(CERT *cert)
if (ret->pkeys[i].authz == NULL)
{
SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
return(NULL);
return NULL;
}
memcpy(ret->pkeys[i].authz,
cert->pkeys[i].authz,
cert->pkeys[i].authz_length);
}
if (cert->pkeys[i].serverinfo != NULL)
{
/* Just copy everything. */
ret->pkeys[i].serverinfo_length =
cert->pkeys[i].serverinfo_length;
ret->pkeys[i].serverinfo =
OPENSSL_malloc(ret->pkeys[i].serverinfo_length);
if (ret->pkeys[i].serverinfo == NULL)
{
SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
return NULL;
}
memcpy(ret->pkeys[i].serverinfo,
cert->pkeys[i].serverinfo,
cert->pkeys[i].serverinfo_length);
}
#endif
}
ret->references=1;
@ -460,8 +479,16 @@ void ssl_cert_clear_certs(CERT *c)
cpk->chain = NULL;
}
#ifndef OPENSSL_NO_TLSEXT
if (cpk->authz != NULL)
if (cpk->authz)
{
OPENSSL_free(cpk->authz);
cpk->authz = NULL;
}
if (cpk->serverinfo)
{
OPENSSL_free(cpk->serverinfo);
cpk->serverinfo = NULL;
}
#endif
/* Clear all flags apart from explicit sign */
cpk->valid_flags &= CERT_PKEY_EXPLICIT_SIGN;

3
ssl/ssl_err.c
View file

@ -233,6 +233,8 @@ static ERR_STRING_DATA SSL_str_functs[]=
{ERR_FUNC(SSL_F_SSL_CTX_USE_RSAPRIVATEKEY), "SSL_CTX_use_RSAPrivateKey"},
{ERR_FUNC(SSL_F_SSL_CTX_USE_RSAPRIVATEKEY_ASN1), "SSL_CTX_use_RSAPrivateKey_ASN1"},
{ERR_FUNC(SSL_F_SSL_CTX_USE_RSAPRIVATEKEY_FILE), "SSL_CTX_use_RSAPrivateKey_file"},
{ERR_FUNC(SSL_F_SSL_CTX_USE_SERVERINFO), "SSL_CTX_use_serverinfo"},
{ERR_FUNC(SSL_F_SSL_CTX_USE_SERVERINFO_FILE), "SSL_CTX_use_serverinfo_file"},
{ERR_FUNC(SSL_F_SSL_DO_HANDSHAKE), "SSL_do_handshake"},
{ERR_FUNC(SSL_F_SSL_GET_NEW_SESSION), "ssl_get_new_session"},
{ERR_FUNC(SSL_F_SSL_GET_PREV_SESSION), "ssl_get_prev_session"},
@ -410,6 +412,7 @@ static ERR_STRING_DATA SSL_str_reasons[]=
{ERR_REASON(SSL_R_INVALID_COMPRESSION_ALGORITHM),"invalid compression algorithm"},
{ERR_REASON(SSL_R_INVALID_NULL_CMD_NAME) ,"invalid null cmd name"},
{ERR_REASON(SSL_R_INVALID_PURPOSE) ,"invalid purpose"},
{ERR_REASON(SSL_R_INVALID_SERVERINFO_DATA),"invalid serverinfo data"},
{ERR_REASON(SSL_R_INVALID_SRP_USERNAME) ,"invalid srp username"},
{ERR_REASON(SSL_R_INVALID_STATUS_RESPONSE),"invalid status response"},
{ERR_REASON(SSL_R_INVALID_TICKET_KEYS_LENGTH),"invalid ticket keys length"},

83
ssl/ssl_lib.c
View file

@ -1697,6 +1697,61 @@ void SSL_CTX_set_next_proto_select_cb(SSL_CTX *ctx, int (*cb) (SSL *s, unsigned
ctx->next_proto_select_cb_arg = arg;
}
# endif
int SSL_CTX_set_custom_cli_ext(SSL_CTX *ctx, unsigned short ext_type,
custom_cli_ext_first_cb_fn fn1,
custom_cli_ext_second_cb_fn fn2, void* arg)
{
/* Check for duplicates */
size_t i;
custom_cli_ext_record* record;
for (i=0; i < ctx->custom_cli_ext_records_count; i++)
if (ext_type == ctx->custom_cli_ext_records[i].ext_type)
return 0;
ctx->custom_cli_ext_records = OPENSSL_realloc(ctx->custom_cli_ext_records,
(ctx->custom_cli_ext_records_count+1) * sizeof(custom_cli_ext_record));
if (!ctx->custom_cli_ext_records) {
ctx->custom_cli_ext_records_count = 0;
return 0;
}
ctx->custom_cli_ext_records_count++;
record = &ctx->custom_cli_ext_records[ctx->custom_cli_ext_records_count - 1];
record->ext_type = ext_type;
record->fn1 = fn1;
record->fn2 = fn2;
record->arg = arg;
return 1;
}
int SSL_CTX_set_custom_srv_ext(SSL_CTX *ctx, unsigned short ext_type,
custom_srv_ext_first_cb_fn fn1,
custom_srv_ext_second_cb_fn fn2, void* arg)
{
/* Check for duplicates */
size_t i;
custom_srv_ext_record* record;
for (i=0; i < ctx->custom_srv_ext_records_count; i++)
if (ext_type == ctx->custom_srv_ext_records[i].ext_type)
return 0;
ctx->custom_srv_ext_records = OPENSSL_realloc(ctx->custom_srv_ext_records,
(ctx->custom_srv_ext_records_count+1) * sizeof(custom_srv_ext_record));
if (!ctx->custom_srv_ext_records) {
ctx->custom_srv_ext_records_count = 0;
return 0;
}
ctx->custom_srv_ext_records_count++;
record = &ctx->custom_srv_ext_records[ctx->custom_srv_ext_records_count - 1];
record->ext_type = ext_type;
record->fn1 = fn1;
record->fn2 = fn2;
record->arg = arg;
return 1;
}
#endif
int SSL_export_keying_material(SSL *s, unsigned char *out, size_t olen,
@ -1896,6 +1951,10 @@ SSL_CTX *SSL_CTX_new(const SSL_METHOD *meth)
#ifndef OPENSSL_NO_SRP
SSL_CTX_SRP_CTX_init(ret);
#endif
ret->custom_cli_ext_records = NULL;
ret->custom_cli_ext_records_count = 0;
ret->custom_srv_ext_records = NULL;
ret->custom_srv_ext_records_count = 0;
#ifndef OPENSSL_NO_BUF_FREELISTS
ret->freelist_max_len = SSL_MAX_BUF_FREELIST_LEN_DEFAULT;
ret->rbuf_freelist = OPENSSL_malloc(sizeof(SSL3_BUF_FREELIST));
@ -2034,6 +2093,10 @@ void SSL_CTX_free(SSL_CTX *a)
#ifndef OPENSSL_NO_SRP
SSL_CTX_SRP_CTX_free(a);
#endif
#ifndef OPENSSL_NO_TLSEXT
OPENSSL_free(a->custom_cli_ext_records);
OPENSSL_free(a->custom_srv_ext_records);
#endif
#ifndef OPENSSL_NO_ENGINE
if (a->client_cert_engine)
ENGINE_finish(a->client_cert_engine);
@ -2479,6 +2542,26 @@ unsigned char *ssl_get_authz_data(SSL *s, size_t *authz_length)
return c->pkeys[i].authz;
}
int ssl_get_server_cert_serverinfo(SSL *s, const unsigned char **serverinfo,
size_t *serverinfo_length)
{
CERT *c = NULL;
int i = 0;
*serverinfo_length = 0;
c = s->cert;
i = ssl_get_server_cert_index(s);
if (i == -1)
return 0;
if (c->pkeys[i].serverinfo == NULL)
return 0;
*serverinfo = c->pkeys[i].serverinfo;
*serverinfo_length = c->pkeys[i].serverinfo_length;
return 1;
}
#endif
void ssl_update_cache(SSL *s,int mode)

12
ssl/ssl_locl.h
View file

@ -510,6 +510,14 @@ typedef struct cert_pkey_st
* uint8_t data[length]; */
unsigned char *authz;
size_t authz_length;
/* serverinfo data for this certificate. The data is in TLS Extension
* wire format, specifically it's a series of records like:
* uint16_t extension_type; // (RFC 5246, 7.4.1.4, Extension)
* uint16_t length;
* uint8_t data[length]; */
unsigned char *serverinfo;
size_t serverinfo_length;
#endif
/* Set if CERT_PKEY can be used with current SSL session: e.g.
* appropriate curve, signature algorithms etc. If zero it can't be
@ -1000,7 +1008,11 @@ int ssl_undefined_function(SSL *s);
int ssl_undefined_void_function(void);
int ssl_undefined_const_function(const SSL *s);
CERT_PKEY *ssl_get_server_send_pkey(const SSL *s);
#ifndef OPENSSL_NO_TLSEXT
unsigned char *ssl_get_authz_data(SSL *s, size_t *authz_length);
int ssl_get_server_cert_serverinfo(SSL *s, const unsigned char **serverinfo,
size_t *serverinfo_length);
#endif
EVP_PKEY *ssl_get_sign_pkey(SSL *s,const SSL_CIPHER *c, const EVP_MD **pmd);
int ssl_cert_type(X509 *x,EVP_PKEY *pkey);
void ssl_set_cert_masks(CERT *c, const SSL_CIPHER *cipher);

242
ssl/ssl_rsa.c
View file

@ -471,6 +471,14 @@ static int ssl_set_cert(CERT *c, X509 *x)
c->pkeys[i].authz = NULL;
c->pkeys[i].authz_length = 0;
}
/* Free the old serverinfo data, if it exists. */
if (c->pkeys[i].serverinfo != NULL)
{
OPENSSL_free(c->pkeys[i].serverinfo);
c->pkeys[i].serverinfo = NULL;
c->pkeys[i].serverinfo_length = 0;
}
#endif
c->key= &(c->pkeys[i]);
@ -855,6 +863,116 @@ static char authz_validate(const unsigned char *authz, size_t length)
}
}
static int serverinfo_find_extension(const unsigned char *serverinfo,
size_t serverinfo_length,
unsigned short extension_type,
const unsigned char **extension_data,
unsigned short *extension_length)
{
*extension_data = NULL;
*extension_length = 0;
if (serverinfo == NULL || serverinfo_length == 0)
return 0;
for (;;)
{
unsigned short type = 0; /* uint16 */
unsigned short len = 0; /* uint16 */
/* end of serverinfo */
if (serverinfo_length == 0)
return 0;
/* read 2-byte type field */
if (serverinfo_length < 2)
return 0; /* error */
type = (serverinfo[0] << 8) + serverinfo[1];
serverinfo += 2;
serverinfo_length -= 2;
/* read 2-byte len field */
if (serverinfo_length < 2)
return 0; /* error */
len = (serverinfo[0] << 8) + serverinfo[1];
serverinfo += 2;
serverinfo_length -= 2;
if (len > serverinfo_length)
return 0; /* error */
if (type == extension_type)
{
*extension_data = serverinfo;
*extension_length = len;
return 1;
}
serverinfo += len;
serverinfo_length -= len;
}
return 0;
}
static int serverinfo_srv_cb(SSL *s, unsigned short ext_type,
const unsigned char **out, unsigned short *outlen,
void *arg)
{
const unsigned char *serverinfo = NULL;
size_t serverinfo_length = 0;
/* Is there a serverinfo for the chosen server cert? */
if ((ssl_get_server_cert_serverinfo(s, &serverinfo,
&serverinfo_length)) != 0)
{
/* Find the relevant extension from the serverinfo */
serverinfo_find_extension(serverinfo, serverinfo_length,
ext_type, out, outlen);
}
return 1;
}
static int serverinfo_validate(const unsigned char *serverinfo,
size_t serverinfo_length, SSL_CTX *ctx)
{
if (serverinfo == NULL || serverinfo_length == 0)
return 0;
for (;;)
{
unsigned short ext_type = 0; /* uint16 */
unsigned short len = 0; /* uint16 */
/* end of serverinfo */
if (serverinfo_length == 0)
return 1;
/* read 2-byte type field */
if (serverinfo_length < 2)
return 0;
/* FIXME: check for types we understand explicitly? */
/* Register callbacks for extensions */
ext_type = (serverinfo[0] << 8) + serverinfo[1];
if (ctx && !SSL_CTX_set_custom_srv_ext(ctx, ext_type, NULL,
serverinfo_srv_cb, NULL))
return 0;
serverinfo += 2;
serverinfo_length -= 2;
/* read 2-byte len field */
if (serverinfo_length < 2)
return 0;
len = (serverinfo[0] << 8) + serverinfo[1];
serverinfo += 2;
serverinfo_length -= 2;
if (len > serverinfo_length)
return 0;
serverinfo += len;
serverinfo_length -= len;
}
}
static const unsigned char *authz_find_data(const unsigned char *authz,
size_t authz_length,
unsigned char data_type,
@ -906,6 +1024,11 @@ static int ssl_set_authz(CERT *c, unsigned char *authz, size_t authz_length)
return(0);
}
current_key->authz = OPENSSL_realloc(current_key->authz, authz_length);
if (current_key->authz == NULL)
{
SSLerr(SSL_F_SSL_SET_AUTHZ,ERR_R_MALLOC_FAILURE);
return 0;
}
current_key->authz_length = authz_length;
memcpy(current_key->authz, authz, authz_length);
return 1;
@ -927,6 +1050,49 @@ int SSL_CTX_use_authz(SSL_CTX *ctx, unsigned char *authz,
return ssl_set_authz(ctx->cert, authz, authz_length);
}
int SSL_CTX_use_serverinfo(SSL_CTX *ctx, const unsigned char *serverinfo,
size_t serverinfo_length)
{
if (ctx == NULL || serverinfo == NULL || serverinfo_length == 0)
{
SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO,ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (!serverinfo_validate(serverinfo, serverinfo_length, NULL))
{
SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO,SSL_R_INVALID_SERVERINFO_DATA);
return(0);
}
if (!ssl_cert_inst(&ctx->cert))
{
SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO,ERR_R_MALLOC_FAILURE);
return 0;
}
if (ctx->cert->key == NULL)
{
SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO,ERR_R_INTERNAL_ERROR);
return 0;
}
ctx->cert->key->serverinfo = OPENSSL_realloc(ctx->cert->key->serverinfo,
serverinfo_length);
if (ctx->cert->key->serverinfo == NULL)
{
SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO,ERR_R_MALLOC_FAILURE);
return 0;
}
memcpy(ctx->cert->key->serverinfo, serverinfo, serverinfo_length);
ctx->cert->key->serverinfo_length = serverinfo_length;
/* Now that the serverinfo is validated and stored, go ahead and
* register callbacks. */
if (!serverinfo_validate(serverinfo, serverinfo_length, ctx))
{
SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO,SSL_R_INVALID_SERVERINFO_DATA);
return(0);
}
return 1;
}
int SSL_use_authz(SSL *ssl, unsigned char *authz, size_t authz_length)
{
if (authz == NULL)
@ -1026,5 +1192,81 @@ int SSL_use_authz_file(SSL *ssl, const char *file)
OPENSSL_free(authz);
return ret;
}
int SSL_CTX_use_serverinfo_file(SSL_CTX *ctx, const char *file)
{
unsigned char *serverinfo = NULL;
size_t serverinfo_length = 0;
unsigned char* extension = 0;
long extension_length = 0;
char* name = NULL;
char* header = NULL;
int ret = 0;
BIO *bin = NULL;
size_t num_extensions = 0;
if (ctx == NULL || file == NULL)
{
SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO_FILE,ERR_R_PASSED_NULL_PARAMETER);
goto end;
}
bin = BIO_new(BIO_s_file_internal());
if (bin == NULL)
{
SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO_FILE, ERR_R_BUF_LIB);
goto end;
}
if (BIO_read_filename(bin, file) <= 0)
{
SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO_FILE, ERR_R_SYS_LIB);
goto end;
}
for (num_extensions=0;; num_extensions++)
{
if (PEM_read_bio(bin, &name, &header, &extension, &extension_length) == 0)
{
/* There must be at least one extension in this file */
if (num_extensions == 0)
{
SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO_FILE, ERR_R_PEM_LIB);
goto end;
}
else /* End of file, we're done */
break;
}
/* Check that the decoded PEM data is plausible (valid length field) */
if (extension_length < 4 || (extension[2] << 8) + extension[3] != extension_length - 4)
{
SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO_FILE, ERR_R_PEM_LIB);
goto end;
}
/* Append the decoded extension to the serverinfo buffer */
serverinfo = OPENSSL_realloc(serverinfo, serverinfo_length + extension_length);
if (serverinfo == NULL)
{
SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO_FILE, ERR_R_MALLOC_FAILURE);
goto end;
}
memcpy(serverinfo + serverinfo_length, extension, extension_length);
serverinfo_length += extension_length;
OPENSSL_free(name); name = NULL;
OPENSSL_free(header); header = NULL;
OPENSSL_free(extension); extension = NULL;
}
ret = SSL_CTX_use_serverinfo(ctx, serverinfo, serverinfo_length);
end:
/* SSL_CTX_use_serverinfo makes a local copy of the serverinfo. */
OPENSSL_free(name);
OPENSSL_free(header);
OPENSSL_free(extension);
OPENSSL_free(serverinfo);
if (bin != NULL)
BIO_free(bin);
return ret;
}
#endif /* OPENSSL_NO_STDIO */
#endif /* OPENSSL_NO_TLSEXT */

74
ssl/ssltest.c
View file

@ -370,6 +370,41 @@ static int verify_npn(SSL *client, SSL *server)
}
#endif
#define SCT_EXT_TYPE 18
#define TACK_EXT_TYPE 62208
/* These set from cmdline */
char* serverinfo_file = NULL;
int serverinfo_sct = 0;
int serverinfo_tack = 0;
int serverinfo_sct_seen = 0;
int serverinfo_tack_seen = 0;
int serverinfo_other_seen = 0;
static int serverinfo_cli_cb(SSL* s, unsigned short ext_type,
const unsigned char* in, unsigned short inlen,
int* al, void* arg)
{
if (ext_type == SCT_EXT_TYPE)
serverinfo_sct_seen++;
else if (ext_type == TACK_EXT_TYPE)
serverinfo_tack_seen++;
else
serverinfo_other_seen++;
return 1;
}
static int verify_serverinfo()
{
if (serverinfo_sct != serverinfo_sct_seen)
return -1;
if (serverinfo_tack != serverinfo_tack_seen)
return -1;
if (serverinfo_other_seen)
return -1;
return 0;
}
static char *cipher=NULL;
static int verbose=0;
static int debug=0;
@ -449,6 +484,9 @@ static void sv_usage(void)
fprintf(stderr," -npn_server - have server side offer NPN\n");
fprintf(stderr," -npn_server_reject - have server reject NPN\n");
#endif
fprintf(stderr," -serverinfo_file - have server use this file\n");
fprintf(stderr," -serverinfo_sct - have client offer and expect SCT\n");
fprintf(stderr," -serverinfo_tack - have client offer and expect TACK\n");
}
static void print_details(SSL *c_ssl, const char *prefix)
@ -861,6 +899,19 @@ int main(int argc, char *argv[])
npn_server_reject = 1;
}
#endif
else if (strcmp(*argv,"-serverinfo_sct") == 0)
{
serverinfo_sct = 1;
}
else if (strcmp(*argv,"-serverinfo_tack") == 0)
{
serverinfo_tack = 1;
}
else if (strcmp(*argv,"-serverinfo_file") == 0)
{
if (--argc < 1) goto bad;
serverinfo_file = *(++argv);
}
else
{
fprintf(stderr,"unknown option %s\n",*argv);
@ -1186,6 +1237,18 @@ bad:
}
#endif
if (serverinfo_sct)
SSL_CTX_set_custom_cli_ext(c_ctx, SCT_EXT_TYPE, NULL, serverinfo_cli_cb, NULL);
if (serverinfo_tack)
SSL_CTX_set_custom_cli_ext(c_ctx, TACK_EXT_TYPE, NULL, serverinfo_cli_cb, NULL);
if (serverinfo_file)
if (!SSL_CTX_use_serverinfo_file(s_ctx, serverinfo_file))
{
BIO_printf(bio_err, "missing serverinfo file\n");
goto end;
}
c_ssl=SSL_new(c_ctx);
s_ssl=SSL_new(s_ctx);
@ -1643,6 +1706,12 @@ int doit_biopair(SSL *s_ssl, SSL *c_ssl, long count,
goto end;
}
#endif
if (verify_serverinfo() < 0)
{
ret = 1;
goto err;
}
end:
ret = 0;
@ -1945,6 +2014,11 @@ int doit(SSL *s_ssl, SSL *c_ssl, long count)
goto err;
}
#endif
if (verify_serverinfo() < 0)
{
ret = 1;
goto err;
}
ret=0;
err:
/* We have to set the BIO's to NULL otherwise they will be

127
ssl/t1_lib.c
View file

@ -1443,6 +1443,31 @@ unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned cha
*(ret++) = TLSEXT_AUTHZDATAFORMAT_audit_proof;
}
/* Add custom TLS Extensions to ClientHello */
if (s->ctx->custom_cli_ext_records_count)
{
size_t i;
custom_cli_ext_record* record;
for (i = 0; i < s->ctx->custom_cli_ext_records_count; i++)
{
const unsigned char* out = NULL;
unsigned short outlen = 0;
record = &s->ctx->custom_cli_ext_records[i];
if (record->fn1 && !record->fn1(s, record->ext_type,
&out, &outlen,
record->arg))
return NULL;
if (limit < ret + 4 + outlen)
return NULL;
s2n(record->ext_type, ret);
s2n(outlen, ret);
memcpy(ret, out, outlen);
ret += outlen;
}
}
if ((extdatalen = ret-p-2) == 0)
return p;
@ -1709,6 +1734,40 @@ unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned cha
}
}
/* If custom types were sent in ClientHello, add ServerHello responses */
if (s->s3->tlsext_custom_types_count)
{
size_t i;
for (i = 0; i < s->s3->tlsext_custom_types_count; i++)
{
size_t j;
custom_srv_ext_record *record;
for (j = 0; j < s->ctx->custom_srv_ext_records_count; j++)
{
record = &s->ctx->custom_srv_ext_records[j];
if (s->s3->tlsext_custom_types[i] == record->ext_type)
{
const unsigned char *out = NULL;
unsigned short outlen = 0;
if (record->fn2
&& !record->fn2(s, record->ext_type,
&out, &outlen,
record->arg))
return NULL;
if (limit < ret + 4 + outlen)
return NULL;
s2n(record->ext_type, ret);
s2n(outlen, ret);
memcpy(ret, out, outlen);
ret += outlen;
break;
}
}
}
}
if ((extdatalen = ret-p-2)== 0)
return p;
@ -2274,6 +2333,54 @@ static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char
}
}
/* If this ClientHello extension was unhandled and this is
* a nonresumed connection, check whether the extension is a
* custom TLS Extension (has a custom_srv_ext_record), and if
* so call the callback and record the extension number so that
* an appropriate ServerHello may be later returned.
*/
else if (!s->hit && s->ctx->custom_srv_ext_records_count)
{
custom_srv_ext_record *record;
for (i=0; i < s->ctx->custom_srv_ext_records_count; i++)
{
record = &s->ctx->custom_srv_ext_records[i];
if (type == record->ext_type)
{
/* Error on duplicate TLS Extensions */
size_t j;
for (j = 0; j < s->s3->tlsext_custom_types_count; j++)
{
if (s->s3->tlsext_custom_types[j] == type)
{
*al = TLS1_AD_DECODE_ERROR;
return 0;
}
}
/* Callback */
if (record->fn1 && !record->fn1(s, type, data, size, al, record->arg))
return 0;
/* Add the (non-duplicated) entry */
s->s3->tlsext_custom_types_count++;
s->s3->tlsext_custom_types = OPENSSL_realloc(
s->s3->tlsext_custom_types,
s->s3->tlsext_custom_types_count*2);
if (s->s3->tlsext_custom_types == NULL)
{
s->s3->tlsext_custom_types = 0;
*al = TLS1_AD_INTERNAL_ERROR;
return 0;
}
s->s3->tlsext_custom_types[
s->s3->tlsext_custom_types_count-1] = type;
}
}
}
data+=size;
}
@ -2579,6 +2686,26 @@ static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char
s->s3->tlsext_authz_server_promised = 1;
}
/* If this extension type was not otherwise handled, but
* matches a custom_cli_ext_record, then send it to the c
* callback */
else if (s->ctx->custom_cli_ext_records_count)
{
size_t i;
custom_cli_ext_record* record;
for (i = 0; i < s->ctx->custom_cli_ext_records_count; i++)
{
record = &s->ctx->custom_cli_ext_records[i];
if (record->ext_type == type)
{
if (record->fn2 && !record->fn2(s, type, data, size, al, record->arg))
return 0;
break;
}
}
}
data += size;
}

2
test/Makefile
View file

@ -331,7 +331,7 @@ test_engine: $(ENGINETEST)
test_ssl: keyU.ss certU.ss certCA.ss certP1.ss keyP1.ss certP2.ss keyP2.ss \
intP1.ss intP2.ss $(SSLTEST) testssl testsslproxy \
../apps/server2.pem
../apps/server2.pem serverinfo.pem
@echo "test SSL protocol"
../util/shlib_wrap.sh ./$(SSLTEST) -test_cipherlist
@sh ./testssl keyU.ss certU.ss certCA.ss

16
test/serverinfo.pem Normal file
View file

@ -0,0 +1,16 @@
-----BEGIN SCT-----
ABIAZMevsj4TC5rgwjZNciLGwh15YXoIK9t5aypGJIG4QzyMowmwwDdqxudkUcGa
DvuqlYL7psO5j4/BIHTe677CAZBBH3Ho2NOM5q1zub4AbfUMlKeufuQgeQ2Tj1oe
LJLRzrwDnPs=
-----END SCT-----
-----BEGIN TACK EXTENSION-----
8wABTwFMh1Dz+3W6zULWJKjav5TNaFEXL1h98YtCXeyZnORYg4mbKpxH5CMbjpgx
To3amSqUPF4Ntjc/i9+poutxebYkbgAAAkMcxb8+RaM9YEywaJEGViKJJmpYG/gJ
HgfGaefI9kKbXSDmP9ntg8dLvDzuyYw14ktM2850Q9WvBiltpekilZxVuT2bFtfs
cmS++SAK9YOM8RrKhL1TLmrktoBEJZ6z5GTukYdQ8/t1us1C1iSo2r+UzWhRFy9Y
ffGLQl3smZzkWIOJmyqcR+QjG46YMU6N2pkqlDxeDbY3P4vfqaLrcXm2JG4AAAGN
xXQJPbdniI9rEydVXb1Cu1yT/t7FBEx6hLxuoypXjCI1wCGpXsd8zEnloR0Ank5h
VO/874E/BZlItzSPpcmDKl5Def6BrAJTErQlE9npo52S05YWORxJw1+VYBdqQ09A
x3wA
-----END TACK EXTENSION-----

10
test/testssl
View file

@ -30,6 +30,8 @@ else
extra="$4"
fi
serverinfo="./serverinfo.pem"
#############################################################################
echo test sslv2
@ -176,6 +178,14 @@ $ssltest -bio_pair -tls1 -npn_client -npn_server || exit 1
$ssltest -bio_pair -tls1 -npn_client -npn_server -num 2 || exit 1
$ssltest -bio_pair -tls1 -npn_client -npn_server -num 2 -reuse || exit 1
#############################################################################
# Serverinfo tests
$ssltest -bio_pair -tls1 -serverinfo_file $serverinfo || exit 1
$ssltest -bio_pair -tls1 -serverinfo_file $serverinfo -serverinfo_sct || exit 1
$ssltest -bio_pair -tls1 -serverinfo_file $serverinfo -serverinfo_tack || exit 1
$ssltest -bio_pair -tls1 -serverinfo_file $serverinfo -serverinfo_sct -serverinfo_tack || exit 1
if ../util/shlib_wrap.sh ../apps/openssl no-srp; then
echo skipping SRP tests
else

1
util/pl/unix.pl
View file

@ -396,6 +396,7 @@ sub get_tests
'testss',
'testssl',
'testsslproxy',
'serverinfo.pem',
);
my $copies = copy_scripts(1, 'test', @copies);
$copies .= copy_scripts(0, 'test', ('smcont.txt'));