/*
* Copyright (C) 1997-1999 Matt Newman <[email protected]>
* Copyright (C) 2000 Ajuba Solutions
*
* $Header: /home/rkeene/tmp/cvs2fossil/../tcltls/tls/tls/tls.c,v 1.13 2001/03/14 22:04:35 hobbs Exp $
*
* TLS (aka SSL) Channel - can be layered on any bi-directional
* Tcl_Channel (Note: Requires Trf Core Patch)
*
* This was built (almost) from scratch based upon observation of
* OpenSSL 0.9.2B
*
* Addition credit is due for Andreas Kupries ([email protected]), for
* providing the Tcl_ReplaceChannel mechanism and working closely with me
* to enhance it to support full fileevent semantics.
*
* Also work done by the follow people provided the impetus to do this "right":
* tclSSL (Colin McCormack, Shared Technology)
* SSLtcl (Peter Antman)
*
*/
#include "tlsInt.h"
#include "tclOpts.h"
#include <stdlib.h>
/*
* External functions
*/
/*
* Forward declarations
*/
#define F2N( key, dsp) \
(((key) == NULL) ? (char *) NULL : \
Tcl_TranslateFileName(interp, (key), (dsp)))
#define REASON() ERR_reason_error_string(ERR_get_error())
static int CiphersObjCmd _ANSI_ARGS_ ((ClientData clientData,
Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]));
static int HandshakeObjCmd _ANSI_ARGS_ ((ClientData clientData,
Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]));
static int ImportObjCmd _ANSI_ARGS_ ((ClientData clientData,
Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]));
static int StatusObjCmd _ANSI_ARGS_ ((ClientData clientData,
Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]));
static SSL_CTX *CTX_Init _ANSI_ARGS_((Tcl_Interp *interp, int proto, char *key,
char *cert, char *CAdir, char *CAfile, char *ciphers));
#define TLS_PROTO_SSL2 0x01
#define TLS_PROTO_SSL3 0x02
#define TLS_PROTO_TLS1 0x04
#define ENABLED(flag, mask) (((flag) & (mask)) == (mask))
/*
* Static data structures
*/
#ifndef NO_DH
/* from openssl/apps/s_server.c */
static unsigned char dh512_p[]={
0xDA,0x58,0x3C,0x16,0xD9,0x85,0x22,0x89,0xD0,0xE4,0xAF,0x75,
0x6F,0x4C,0xCA,0x92,0xDD,0x4B,0xE5,0x33,0xB8,0x04,0xFB,0x0F,
0xED,0x94,0xEF,0x9C,0x8A,0x44,0x03,0xED,0x57,0x46,0x50,0xD3,
0x69,0x99,0xDB,0x29,0xD7,0x76,0x27,0x6B,0xA2,0xD3,0xD4,0x12,
0xE2,0x18,0xF4,0xDD,0x1E,0x08,0x4C,0xF6,0xD8,0x00,0x3E,0x7C,
0x47,0x74,0xE8,0x33,
};
static unsigned char dh512_g[]={
0x02,
};
static DH *get_dh512()
{
DH *dh=NULL;
if ((dh=DH_new()) == NULL) return(NULL);
dh->p=BN_bin2bn(dh512_p,sizeof(dh512_p),NULL);
dh->g=BN_bin2bn(dh512_g,sizeof(dh512_g),NULL);
if ((dh->p == NULL) || (dh->g == NULL))
return(NULL);
return(dh);
}
#endif
/*
* Defined in Tls_Init to determine what kind of channels we are using
* (old-style 8.2.0-8.3.1 or new-style 8.3.2+).
*/
int channelTypeVersion;
/*
* We lose the tcl password callback when we use the RSA BSAFE SSL-C 1.1.2
* libraries instead of the current OpenSSL libraries.
*/
#ifdef BSAFE
#define PRE_OPENSSL_0_9_4 1
#endif
/*
* Per OpenSSL 0.9.4 Compat
*/
#ifndef STACK_OF
#define STACK_OF(x) STACK
#define sk_SSL_CIPHER_num(sk) sk_num((sk))
#define sk_SSL_CIPHER_value( sk, index) (SSL_CIPHER*)sk_value((sk), (index))
#endif
/*
*-------------------------------------------------------------------
*
* InfoCallback --
*
* monitors SSL connection process
*
* Results:
* None
*
* Side effects:
* Calls callback (if defined)
*-------------------------------------------------------------------
*/
static void
InfoCallback(SSL *ssl, int where, int ret)
{
State *statePtr = (State*)SSL_get_app_data(ssl);
Tcl_Obj *cmdPtr;
char *major; char *minor;
if (statePtr->callback == (Tcl_Obj*)NULL)
return;
cmdPtr = Tcl_DuplicateObj(statePtr->callback);
#if 0
if (where & SSL_CB_ALERT) {
sev = SSL_alert_type_string_long(ret);
if (strcmp( sev, "fatal")==0) { /* Map to error */
Tls_Error(statePtr, SSL_ERROR(ssl, 0));
return;
}
}
#endif
if (where & SSL_CB_HANDSHAKE_START) {
major = "handshake";
minor = "start";
} else if (where & SSL_CB_HANDSHAKE_DONE) {
major = "handshake";
minor = "done";
} else {
if (where & SSL_CB_ALERT) major = "alert";
else if (where & SSL_ST_CONNECT) major = "connect";
else if (where & SSL_ST_ACCEPT) major = "accept";
else major = "unknown";
if (where & SSL_CB_READ) minor = "read";
else if (where & SSL_CB_WRITE) minor = "write";
else if (where & SSL_CB_LOOP) minor = "loop";
else if (where & SSL_CB_EXIT) minor = "exit";
else minor = "unknown";
}
Tcl_ListObjAppendElement( statePtr->interp, cmdPtr,
Tcl_NewStringObj( "info", -1));
Tcl_ListObjAppendElement( statePtr->interp, cmdPtr,
Tcl_NewStringObj( Tcl_GetChannelName(statePtr->self), -1) );
Tcl_ListObjAppendElement( statePtr->interp, cmdPtr,
Tcl_NewStringObj( major, -1) );
Tcl_ListObjAppendElement( statePtr->interp, cmdPtr,
Tcl_NewStringObj( minor, -1) );
if (where & (SSL_CB_LOOP|SSL_CB_EXIT)) {
Tcl_ListObjAppendElement( statePtr->interp, cmdPtr,
Tcl_NewStringObj( SSL_state_string_long(ssl), -1) );
} else if (where & SSL_CB_ALERT) {
char *cp = SSL_alert_desc_string_long(ret);
Tcl_ListObjAppendElement( statePtr->interp, cmdPtr,
Tcl_NewStringObj( cp, -1) );
} else {
Tcl_ListObjAppendElement( statePtr->interp, cmdPtr,
Tcl_NewStringObj( SSL_state_string_long(ssl), -1) );
}
Tcl_Preserve( (ClientData) statePtr->interp);
Tcl_Preserve( (ClientData) statePtr);
Tcl_IncrRefCount( cmdPtr);
(void) Tcl_GlobalEvalObj(statePtr->interp, cmdPtr);
Tcl_DecrRefCount( cmdPtr);
Tcl_Release( (ClientData) statePtr);
Tcl_Release( (ClientData) statePtr->interp);
}
/*
*-------------------------------------------------------------------
*
* VerifyCallback --
*
* monitors SSL cerificate validation process
* This is called whenever a certificate is inspected
* or decided invalid
*
* Results:
* ok - let SSL handle it
*
* Side effects:
* The err field of the currently operative State is set
* to a string describing the SSL negotiation failure reason
*-------------------------------------------------------------------
*/
static int
VerifyCallback(int ok, X509_STORE_CTX *ctx)
{
Tcl_Obj *cmdPtr;
char *errStr;
SSL *ssl = (SSL*)X509_STORE_CTX_get_app_data(ctx);
X509 *cert = X509_STORE_CTX_get_current_cert(ctx);
State *statePtr = (State*)SSL_get_app_data(ssl);
int depth = X509_STORE_CTX_get_error_depth(ctx);
int err = X509_STORE_CTX_get_error(ctx);
dprintf(stderr, "Verify: %d\n", ok);
if (!ok) {
errStr = (char*)X509_verify_cert_error_string(err);
} else {
errStr = (char *)0;
}
if (statePtr->callback == (Tcl_Obj*)NULL) {
if (statePtr->vflags & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
return ok;
} else {
return 1;
}
}
cmdPtr = Tcl_DuplicateObj(statePtr->callback);
Tcl_ListObjAppendElement( statePtr->interp, cmdPtr,
Tcl_NewStringObj( "verify", -1));
Tcl_ListObjAppendElement( statePtr->interp, cmdPtr,
Tcl_NewStringObj( Tcl_GetChannelName(statePtr->self), -1) );
Tcl_ListObjAppendElement( statePtr->interp, cmdPtr,
Tcl_NewIntObj( depth) );
Tcl_ListObjAppendElement( statePtr->interp, cmdPtr,
Tls_NewX509Obj( statePtr->interp, cert) );
Tcl_ListObjAppendElement( statePtr->interp, cmdPtr,
Tcl_NewIntObj( ok) );
Tcl_ListObjAppendElement( statePtr->interp, cmdPtr,
Tcl_NewStringObj( errStr ? errStr : "", -1) );
Tcl_Preserve( (ClientData) statePtr->interp);
Tcl_Preserve( (ClientData) statePtr);
Tcl_IncrRefCount( cmdPtr);
if (Tcl_GlobalEvalObj(statePtr->interp, cmdPtr) != TCL_OK) {
/* it got an error - reject the certificate */
Tcl_BackgroundError( statePtr->interp);
ok = 0;
} else {
if (Tcl_GetIntFromObj( statePtr->interp,
Tcl_GetObjResult( statePtr->interp), &ok) != TCL_OK) {
Tcl_BackgroundError( statePtr->interp);
ok = 0;
}
}
Tcl_DecrRefCount( cmdPtr);
Tcl_Release( (ClientData) statePtr);
Tcl_Release( (ClientData) statePtr->interp);
return(ok); /* leave the disposition as SSL set it */
}
/*
*-------------------------------------------------------------------
*
* Tls_Error --
*
* Calls callback with $fd and $msg - so the callback can decide
* what to do with errors.
*
* Results:
* ok - let SSL handle it
*
* Side effects:
* The err field of the currently operative State is set
* to a string describing the SSL negotiation failure reason
*-------------------------------------------------------------------
*/
void
Tls_Error(State *statePtr, char *msg)
{
Tcl_Obj *cmdPtr;
if (msg && *msg) {
Tcl_SetErrorCode(statePtr->interp, "SSL", msg, (char *)NULL);
} else {
msg = Tcl_GetStringFromObj(Tcl_GetObjResult(statePtr->interp), NULL);
}
statePtr->err = msg;
if (statePtr->callback == (Tcl_Obj*)NULL) {
char buf[BUFSIZ];
sprintf(buf, "SSL channel \"%s\": error: %s",
Tcl_GetChannelName(statePtr->self), msg);
Tcl_SetResult( statePtr->interp, buf, TCL_VOLATILE);
Tcl_BackgroundError( statePtr->interp);
return;
}
cmdPtr = Tcl_DuplicateObj(statePtr->callback);
Tcl_ListObjAppendElement(statePtr->interp, cmdPtr,
Tcl_NewStringObj("error", -1));
Tcl_ListObjAppendElement(statePtr->interp, cmdPtr,
Tcl_NewStringObj(Tcl_GetChannelName(statePtr->self), -1));
Tcl_ListObjAppendElement(statePtr->interp, cmdPtr,
Tcl_NewStringObj(msg, -1));
Tcl_Preserve((ClientData) statePtr->interp);
Tcl_Preserve((ClientData) statePtr);
Tcl_IncrRefCount(cmdPtr);
if (Tcl_GlobalEvalObj(statePtr->interp, cmdPtr) != TCL_OK) {
Tcl_BackgroundError(statePtr->interp);
}
Tcl_DecrRefCount(cmdPtr);
Tcl_Release((ClientData) statePtr);
Tcl_Release((ClientData) statePtr->interp);
}
/*
*-------------------------------------------------------------------
*
* PasswordCallback --
*
* Called when a password is needed to unpack RSA and PEM keys
* Evals the tcl proc: tls::password and returns the result as
* the password
*-------------------------------------------------------------------
*/
#ifdef PRE_OPENSSL_0_9_4
/*
* No way to handle user-data therefore no way without a global
* variable to access the Tcl interpreter.
*/
static int
PasswordCallback(char *buf, int size, int verify)
{
return -1;
}
#else
static int
PasswordCallback(char *buf, int size, int verify, void *udata)
{
Tcl_Interp *interp = (Tcl_Interp*)udata;
if (Tcl_Eval(interp, "tls::password") == TCL_OK) {
char *ret = Tcl_GetStringResult(interp);
strncpy(buf, ret, size);
return strlen(ret);
} else {
return -1;
}
}
#endif
/*
*-------------------------------------------------------------------
*
* CiphersObjCmd -- list available ciphers
*
* This procedure is invoked to process the "tls::ciphers" command
* to list available ciphers, based upon protocol selected.
*
* Results:
* A standard Tcl result list.
*
* Side effects:
* constructs and destroys SSL context (CTX)
*
*-------------------------------------------------------------------
*/
static int
CiphersObjCmd(clientData, interp, objc, objv)
ClientData clientData; /* Not used. */
Tcl_Interp *interp;
int objc;
Tcl_Obj *CONST objv[];
{
static char *protocols[] = {
"ssl2",
"ssl3",
"tls1",
NULL
};
enum protocol {
TLS_SSL2,
TLS_SSL3,
TLS_TLS1,
TLS_NONE
};
Tcl_Obj *objPtr;
SSL_CTX *ctx = NULL;
SSL *ssl = NULL;
STACK_OF(SSL_CIPHER) *sk;
char *cp, buf[BUFSIZ];
int index, verbose = 0;
if (objc < 2 || objc > 3) {
Tcl_WrongNumArgs(interp, 1, objv, "protocol ?verbose?");
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj( interp, objv[1], protocols, "protocol", 0,
&index) != TCL_OK) {
return TCL_ERROR;
}
if (objc > 2 && Tcl_GetBooleanFromObj( interp, objv[2],
&verbose) != TCL_OK) {
return TCL_ERROR;
}
switch ((enum protocol)index) {
case TLS_SSL2:
#if defined(NO_SSL2)
Tcl_AppendResult(interp, "protocol not supported", NULL);
return TCL_ERROR;
#else
ctx = SSL_CTX_new(SSLv2_method()); break;
#endif
case TLS_SSL3:
#if defined(NO_SSL3)
Tcl_AppendResult(interp, "protocol not supported", NULL);
return TCL_ERROR;
#else
ctx = SSL_CTX_new(SSLv3_method()); break;
#endif
case TLS_TLS1:
#if defined(NO_TLS1)
Tcl_AppendResult(interp, "protocol not supported", NULL);
return TCL_ERROR;
#else
ctx = SSL_CTX_new(TLSv1_method()); break;
#endif
}
if (ctx == NULL) {
Tcl_AppendResult(interp, REASON(), (char *) NULL);
return TCL_ERROR;
}
ssl = SSL_new(ctx);
if (ssl == NULL) {
Tcl_AppendResult(interp, REASON(), (char *) NULL);
SSL_CTX_free(ctx);
return TCL_ERROR;
}
objPtr = Tcl_NewListObj( 0, NULL);
if (!verbose) {
for (index = 0; ; index++) {
cp = (char*)SSL_get_cipher_list( ssl, index);
if (cp == NULL) break;
Tcl_ListObjAppendElement( interp, objPtr,
Tcl_NewStringObj( cp, -1) );
}
} else {
sk = SSL_get_ciphers(ssl);
for (index = 0; index < sk_SSL_CIPHER_num(sk); index++) {
register int i;
SSL_CIPHER_description( sk_SSL_CIPHER_value( sk, index),
buf, sizeof(buf));
for (i = strlen(buf) - 1; i ; i--) {
if (buf[i] == ' ' || buf[i] == '\n' ||
buf[i] == '\r' || buf[i] == '\t') {
buf[i] = '\0';
} else {
break;
}
}
Tcl_ListObjAppendElement( interp, objPtr,
Tcl_NewStringObj( buf, -1) );
}
}
SSL_free(ssl);
SSL_CTX_free(ctx);
Tcl_SetObjResult( interp, objPtr);
return TCL_OK;
}
/*
*-------------------------------------------------------------------
*
* HandshakeObjCmd --
*
* This command is used to verify whether the handshake is complete
* or not.
*
* Results:
* A standard Tcl result. 1 means handshake complete, 0 means pending.
*
* Side effects:
* May force SSL negotiation to take place.
*
*-------------------------------------------------------------------
*/
static int
HandshakeObjCmd(clientData, interp, objc, objv)
ClientData clientData; /* Not used. */
Tcl_Interp *interp;
int objc;
Tcl_Obj *CONST objv[];
{
Tcl_Channel chan; /* The channel to set a mode on. */
State *statePtr; /* client state for ssl socket */
int ret = 1;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "channel");
return TCL_ERROR;
}
chan = Tcl_GetChannel(interp, Tcl_GetStringFromObj(objv[1], NULL), NULL);
if (chan == (Tcl_Channel) NULL) {
return TCL_ERROR;
}
if (channelTypeVersion == TLS_CHANNEL_VERSION_2) {
/*
* Make sure to operate on the topmost channel
*/
chan = Tcl_GetTopChannel(chan);
}
if (Tcl_GetChannelType(chan) != Tls_ChannelType()) {
Tcl_AppendResult(interp, "bad channel \"", Tcl_GetChannelName(chan),
"\": not a TLS channel", NULL);
return TCL_ERROR;
}
statePtr = (State *)Tcl_GetChannelInstanceData(chan);
if (!SSL_is_init_finished(statePtr->ssl)) {
int err;
ret = Tls_WaitForConnect(statePtr, &err);
if (ret < 0) {
char *errStr = statePtr->err;
Tcl_ResetResult(interp);
Tcl_SetErrno(err);
if (!errStr || *errStr == 0) {
errStr = Tcl_PosixError(interp);
}
Tcl_AppendResult(interp, "handshake failed: ", errStr,
(char *) NULL);
return TCL_ERROR;
}
}
Tcl_SetObjResult(interp, Tcl_NewIntObj(ret));
return TCL_OK;
}
/*
*-------------------------------------------------------------------
*
* ImportObjCmd --
*
* This procedure is invoked to process the "ssl" command
*
* The ssl command pushes SSL over a (newly connected) tcp socket
*
* Results:
* A standard Tcl result.
*
* Side effects:
* May modify the behavior of an IO channel.
*
*-------------------------------------------------------------------
*/
static int
ImportObjCmd(clientData, interp, objc, objv)
ClientData clientData; /* Not used. */
Tcl_Interp *interp;
int objc;
Tcl_Obj *CONST objv[];
{
Tcl_Channel chan; /* The channel to set a mode on. */
State *statePtr; /* client state for ssl socket */
SSL_CTX *ctx = NULL;
Tcl_Obj *script = NULL;
int idx;
int flags = TLS_TCL_INIT;
int server = 0; /* is connection incoming or outgoing? */
char *key = NULL;
char *cert = NULL;
char *ciphers = NULL;
char *CAfile = NULL;
char *CAdir = NULL;
char *model = NULL;
#if defined(NO_SSL2)
int ssl2 = 0;
#else
int ssl2 = 1;
#endif
#if defined(NO_SSL3)
int ssl3 = 0;
#else
int ssl3 = 1;
#endif
#if defined(NO_SSL2) && defined(NO_SSL3)
int tls1 = 1;
#else
int tls1 = 0;
#endif
int proto = 0;
int verify = 0, require = 0, request = 1;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "channel ?options?");
return TCL_ERROR;
}
chan = Tcl_GetChannel(interp, Tcl_GetStringFromObj(objv[1], NULL), NULL);
if (chan == (Tcl_Channel) NULL) {
return TCL_ERROR;
}
if (channelTypeVersion == TLS_CHANNEL_VERSION_2) {
/*
* Make sure to operate on the topmost channel
*/
chan = Tcl_GetTopChannel(chan);
}
for (idx = 2; idx < objc; idx++) {
char *opt = Tcl_GetStringFromObj(objv[idx], NULL);
if (opt[0] != '-')
break;
OPTSTR( "-cafile", CAfile);
OPTSTR( "-cadir", CAdir);
OPTSTR( "-certfile", cert);
OPTSTR( "-cipher", ciphers);
OPTOBJ( "-command", script);
OPTSTR( "-keyfile", key);
OPTSTR( "-model", model);
OPTBOOL( "-require", require);
OPTBOOL( "-request", request);
OPTBOOL( "-server", server);
OPTBOOL( "-ssl2", ssl2);
OPTBOOL( "-ssl3", ssl3);
OPTBOOL( "-tls1", tls1);
OPTBAD( "option", "-cafile, -cadir, -certfile, -cipher, -command, -keyfile, -model, -require, -request, -ssl2, -ssl3, -server, or -tls1");
return TCL_ERROR;
}
if (request) verify |= SSL_VERIFY_CLIENT_ONCE | SSL_VERIFY_PEER;
if (request && require) verify |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
if (verify == 0) verify = SSL_VERIFY_NONE;
proto |= (ssl2 ? TLS_PROTO_SSL2 : 0);
proto |= (ssl3 ? TLS_PROTO_SSL3 : 0);
proto |= (tls1 ? TLS_PROTO_TLS1 : 0);
/* reset to NULL if blank string provided */
if (cert && !*cert) cert = NULL;
if (key && !*key) key = NULL;
if (ciphers && !*ciphers) ciphers = NULL;
if (CAfile && !*CAfile) CAfile = NULL;
if (CAdir && !*CAdir) CAdir = NULL;
if (model != NULL) {
int mode;
/* Get the "model" context */
chan = Tcl_GetChannel(interp, model, &mode);
if (chan == (Tcl_Channel) NULL) {
return TCL_ERROR;
}
if (channelTypeVersion == TLS_CHANNEL_VERSION_2) {
/*
* Make sure to operate on the topmost channel
*/
chan = Tcl_GetTopChannel(chan);
}
if (Tcl_GetChannelType(chan) != Tls_ChannelType()) {
Tcl_AppendResult(interp, "bad channel \"",
Tcl_GetChannelName(chan), "\": not a TLS channel", NULL);
return TCL_ERROR;
}
statePtr = (State *) Tcl_GetChannelInstanceData(chan);
ctx = statePtr->ctx;
} else {
if ((ctx = CTX_Init(interp, proto, key, cert, CAdir, CAfile, ciphers))
== (SSL_CTX*)0) {
return TCL_ERROR;
}
}
/* new SSL state */
statePtr = (State *) Tcl_Alloc((unsigned) sizeof(State));
statePtr->self = (Tcl_Channel)NULL;
statePtr->timer = (Tcl_TimerToken)NULL;
statePtr->flags = flags;
statePtr->watchMask = 0;
statePtr->mode = 0;
statePtr->interp = interp;
statePtr->callback = (Tcl_Obj *)0;
statePtr->vflags = verify;
statePtr->ssl = (SSL*)0;
statePtr->ctx = ctx;
statePtr->bio = (BIO*)0;
statePtr->p_bio = (BIO*)0;
statePtr->err = "";
/*
* We need to make sure that the channel works in binary (for the
* encryption not to get goofed up).
* We only want to adjust the buffering in pre-v2 channels, where
* each channel in the stack maintained its own buffers.
*/
Tcl_SetChannelOption(interp, chan, "-translation", "binary");
if (channelTypeVersion == TLS_CHANNEL_VERSION_1) {
Tcl_SetChannelOption(interp, chan, "-buffering", "none");
}
if (channelTypeVersion == TLS_CHANNEL_VERSION_2) {
statePtr->self = Tcl_StackChannel(interp, Tls_ChannelType(),
(ClientData) statePtr, (TCL_READABLE | TCL_WRITABLE), chan);
} else {
statePtr->self = chan;
Tcl_StackChannel(interp, Tls_ChannelType(),
(ClientData) statePtr, (TCL_READABLE | TCL_WRITABLE), chan);
}
if (statePtr->self == (Tcl_Channel) NULL) {
/*
* No use of Tcl_EventuallyFree because no possible Tcl_Preserve.
*/
Tls_Free((char *) statePtr);
return TCL_ERROR;
}
/* allocate script */
if (script) {
char *tmp = Tcl_GetStringFromObj(script, NULL);
if (tmp && *tmp) {
statePtr->callback = Tcl_DuplicateObj(script);
Tcl_IncrRefCount(statePtr->callback);
}
}
/* This is only needed because of a bug in OpenSSL, where the
* ssl->verify_callback is not referenced!!! (Must be done
* *before* SSL_new() is called!
*/
SSL_CTX_set_verify(statePtr->ctx, verify, VerifyCallback);
/*
* SSL Initialization
*/
statePtr->ssl = SSL_new(statePtr->ctx);
if (!statePtr->ssl) {
/* SSL library error */
Tcl_AppendResult(interp, "couldn't construct ssl session: ", REASON(),
(char *) NULL);
Tls_Free((char *) statePtr);
return TCL_ERROR;
}
/*
* SSL Callbacks
*/
SSL_set_app_data(statePtr->ssl, (VOID *)statePtr); /* point back to us */
/*
* The following is broken - we need is to set the
* verify_mode, but the library ignores the verify_callback!!!
*/
/*SSL_set_verify(statePtr->ssl, verify, VerifyCallback);*/
SSL_CTX_set_info_callback(statePtr->ctx, InfoCallback);
/* Create Tcl_Channel BIO Handler */
statePtr->p_bio = BIO_new_tcl(statePtr, BIO_CLOSE);
statePtr->bio = BIO_new(BIO_f_ssl());
if (server) {
statePtr->flags |= TLS_TCL_SERVER;
SSL_set_accept_state(statePtr->ssl);
} else {
SSL_set_connect_state(statePtr->ssl);
}
SSL_set_bio(statePtr->ssl, statePtr->p_bio, statePtr->p_bio);
BIO_set_ssl(statePtr->bio, statePtr->ssl, BIO_CLOSE);
/*
* End of SSL Init
*/
Tcl_SetResult(interp, Tcl_GetChannelName(statePtr->self), TCL_VOLATILE);
return TCL_OK;
}
/*
*-------------------------------------------------------------------
*
* CTX_Init -- construct a SSL_CTX instance
*
* Results:
* A valid SSL_CTX instance or NULL.
*
* Side effects:
* constructs SSL context (CTX)
*
*-------------------------------------------------------------------
*/
static SSL_CTX *
CTX_Init(interp, proto, key, cert, CAdir, CAfile, ciphers)
Tcl_Interp *interp;
int proto;
char *key;
char *cert;
char *CAdir;
char *CAfile;
char *ciphers;
{
SSL_CTX *ctx = NULL;
Tcl_DString ds;
Tcl_DString ds1;
int off = 0;
/* create SSL context */
#if !defined(NO_SSL2) && !defined(NO_SSL3)
if (ENABLED(proto, TLS_PROTO_SSL2) &&
ENABLED(proto, TLS_PROTO_SSL3)) {
ctx = SSL_CTX_new(SSLv23_method());
} else
#endif
if (ENABLED(proto, TLS_PROTO_SSL2)) {
#if defined(NO_SSL2)
Tcl_AppendResult(interp, "protocol not supported", NULL);
return (SSL_CTX *)0;
#else
ctx = SSL_CTX_new(SSLv2_method());
#endif
} else if (ENABLED(proto, TLS_PROTO_TLS1)) {
ctx = SSL_CTX_new(TLSv1_method());
} else if (ENABLED(proto, TLS_PROTO_SSL3)) {
#if defined(NO_SSL3)
Tcl_AppendResult(interp, "protocol not supported", NULL);
return (SSL_CTX *)0;
#else
ctx = SSL_CTX_new(SSLv3_method());
#endif
} else {
Tcl_AppendResult(interp, "no valid protocol selected", NULL);
return (SSL_CTX *)0;
}
off |= (ENABLED(proto, TLS_PROTO_TLS1) ? 0 : SSL_OP_NO_TLSv1);
off |= (ENABLED(proto, TLS_PROTO_SSL2) ? 0 : SSL_OP_NO_SSLv2);
off |= (ENABLED(proto, TLS_PROTO_SSL3) ? 0 : SSL_OP_NO_SSLv3);
SSL_CTX_set_app_data( ctx, (VOID*)interp); /* remember the interpreter */
SSL_CTX_set_options( ctx, SSL_OP_ALL); /* all SSL bug workarounds */
SSL_CTX_set_options( ctx, off); /* all SSL bug workarounds */
SSL_CTX_sess_set_cache_size( ctx, 128);
if (ciphers != NULL)
SSL_CTX_set_cipher_list(ctx, ciphers);
/* set some callbacks */
SSL_CTX_set_default_passwd_cb(ctx, PasswordCallback);
#ifndef BSAFE
SSL_CTX_set_default_passwd_cb_userdata(ctx, (void *)interp);
#endif
#ifndef NO_DH
{
DH* dh = get_dh512();
SSL_CTX_set_tmp_dh(ctx, dh);
DH_free(dh);
}
#endif
/* set our certificate */
if (cert != NULL) {
Tcl_DStringInit(&ds);
if (SSL_CTX_use_certificate_file(ctx, F2N( cert, &ds),
SSL_FILETYPE_PEM) <= 0) {
Tcl_DStringFree(&ds);
Tcl_AppendResult(interp,
"unable to set certificate file ", cert, ": ",
REASON(), (char *) NULL);
SSL_CTX_free(ctx);
return (SSL_CTX *)0;
}
/* get the private key associated with this certificate */
if (key == NULL) key=cert;
if (SSL_CTX_use_PrivateKey_file(ctx, F2N( key, &ds),
SSL_FILETYPE_PEM) <= 0) {
Tcl_DStringFree(&ds);
Tcl_AppendResult(interp,
"unable to set public key file ", key, " ",
REASON(), (char *) NULL);
SSL_CTX_free(ctx);
return (SSL_CTX *)0;
}
Tcl_DStringFree(&ds);
/* Now we know that a key and cert have been set against
* the SSL context */
if (!SSL_CTX_check_private_key(ctx)) {
Tcl_AppendResult(interp,
"private key does not match the certificate public key",
(char *) NULL);
SSL_CTX_free(ctx);
return (SSL_CTX *)0;
}
} else {
cert = (char*)X509_get_default_cert_file();
if (SSL_CTX_use_certificate_file(ctx, cert,
SSL_FILETYPE_PEM) <= 0) {
#if 0
Tcl_DStringFree(&ds);
Tcl_AppendResult(interp,
"unable to use default certificate file ", cert, ": ",
REASON(), (char *) NULL);
SSL_CTX_free(ctx);
return (SSL_CTX *)0;
#endif
}
}
Tcl_DStringInit(&ds);
Tcl_DStringInit(&ds1);
if (!SSL_CTX_load_verify_locations(ctx, F2N(CAfile, &ds), F2N(CAdir, &ds1)) ||
!SSL_CTX_set_default_verify_paths(ctx)) {
#if 0
Tcl_DStringFree(&ds);
Tcl_DStringFree(&ds1);
/* Don't currently care if this fails */
Tcl_AppendResult(interp, "SSL default verify paths: ",
REASON(), (char *) NULL);
SSL_CTX_free(ctx);
return (SSL_CTX *)0;
#endif
}
SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file( F2N(CAfile, &ds) ));
Tcl_DStringFree(&ds);
Tcl_DStringFree(&ds1);
return ctx;
}
/*
*-------------------------------------------------------------------
*
* StatusObjCmd -- return certificate for connected peer.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* None.
*
*-------------------------------------------------------------------
*/
static int
StatusObjCmd(clientData, interp, objc, objv)
ClientData clientData; /* Not used. */
Tcl_Interp *interp;
int objc;
Tcl_Obj *CONST objv[];
{
State *statePtr;
X509 *peer;
Tcl_Obj *objPtr;
Tcl_Channel chan;
char *channelName, *ciphers;
int mode;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "channel");
return TCL_ERROR;
}
channelName = Tcl_GetStringFromObj(objv[1], NULL);
chan = Tcl_GetChannel(interp, channelName, &mode);
if (chan == (Tcl_Channel) NULL) {
return TCL_ERROR;
}
if (channelTypeVersion == TLS_CHANNEL_VERSION_2) {
/*
* Make sure to operate on the topmost channel
*/
chan = Tcl_GetTopChannel(chan);
}
if (Tcl_GetChannelType(chan) != Tls_ChannelType()) {
Tcl_AppendResult(interp, "bad channel \"", Tcl_GetChannelName(chan),
"\": not a TLS channel", NULL);
return TCL_ERROR;
}
statePtr = (State *) Tcl_GetChannelInstanceData(chan);
peer = SSL_get_peer_certificate(statePtr->ssl);
if (peer) {
objPtr = Tls_NewX509Obj(interp, peer);
} else {
objPtr = Tcl_NewListObj(0, NULL);
}
ciphers = (char*)SSL_get_cipher(statePtr->ssl);
if (ciphers != NULL && strcmp(ciphers, "(NONE)")!=0) {
Tcl_ListObjAppendElement(interp, objPtr,
Tcl_NewStringObj("cipher", -1));
Tcl_ListObjAppendElement(interp, objPtr,
Tcl_NewStringObj(SSL_get_cipher(statePtr->ssl), -1));
}
Tcl_SetObjResult( interp, objPtr);
return TCL_OK;
}
/*
*-------------------------------------------------------------------
*
* Tls_Free --
*
* This procedure cleans up when a SSL socket based channel
* is closed and its reference count falls below 1
*
* Results:
* none
*
* Side effects:
* Frees all the state
*
*-------------------------------------------------------------------
*/
void
Tls_Free( char *blockPtr )
{
State *statePtr = (State *)blockPtr;
Tls_Clean(statePtr);
Tcl_Free(blockPtr);
}
/*
*-------------------------------------------------------------------
*
* Tls_Clean --
*
* This procedure cleans up when a SSL socket based channel
* is closed and its reference count falls below 1. This should
* be called synchronously by the CloseProc, not in the
* EventuallyFree callback.
*
* Results:
* none
*
* Side effects:
* Frees all the state
*
*-------------------------------------------------------------------
*/
void
Tls_Clean(State *statePtr)
{
/*
* we're assuming here that we're single-threaded
*/
if (statePtr->timer != (Tcl_TimerToken) NULL) {
Tcl_DeleteTimerHandler(statePtr->timer);
statePtr->timer = NULL;
}
if (statePtr->ssl) {
SSL_shutdown(statePtr->ssl);
SSL_free(statePtr->ssl);
statePtr->ssl = NULL;
}
if (statePtr->callback) {
Tcl_DecrRefCount(statePtr->callback);
statePtr->callback = NULL;
}
}
/*
*-------------------------------------------------------------------
*
* Tls_Init --
*
* This is a package initialization procedure, which is called
* by Tcl when this package is to be added to an interpreter.
*
* Results: Ssl configured and loaded
*
* Side effects:
* create the ssl command, initialise ssl context
*
*-------------------------------------------------------------------
*/
int
Tls_Init(Tcl_Interp *interp) /* Interpreter in which the package is
* to be made available. */
{
int major, minor, patchlevel, release, i;
char rnd_seed[16] = "GrzSlplKqUdnnzP!"; /* 16 bytes */
/*
* The original 8.2.0 stacked channel implementation (and the patch
* that preceded it) had problems with scalability and robustness.
* These were address in 8.3.2 / 8.4a2, so we now require that as a
* minimum for TLS 1.4+. We only support 8.2+ now (8.3.2+ preferred).
*/
if (
#ifdef USE_TCL_STUBS
Tcl_InitStubs(interp, "8.2", 0)
#else
Tcl_PkgRequire(interp, "Tcl", "8.2", 0)
#endif
== NULL) {
return TCL_ERROR;
}
/*
* Get the version so we can runtime switch on available functionality.
* TLS should really only be used in 8.3.2+, but the other works for
* some limited functionality, so an attempt at support is made.
*/
Tcl_GetVersion(&major, &minor, &patchlevel, &release);
if ((major > 8) || ((major == 8) && ((minor > 3) || ((minor == 3) &&
(release == TCL_FINAL_RELEASE) && (patchlevel >= 2))))) {
/* 8.3.2+ */
channelTypeVersion = TLS_CHANNEL_VERSION_2;
} else {
/* 8.2.0 - 8.3.1 */
channelTypeVersion = TLS_CHANNEL_VERSION_1;
}
if (SSL_library_init() != 1) {
Tcl_AppendResult(interp, "could not initialize SSL library", NULL);
return TCL_ERROR;
}
SSL_load_error_strings();
ERR_load_crypto_strings();
/*
* Seed the random number generator in the SSL library,
* using the do/while construct because of the bug note in the
* OpenSSL FAQ at http://www.openssl.org/support/faq.html#USER1
*
* The crux of the problem is that Solaris 7 does not have a
* /dev/random or /dev/urandom device so it cannot gather enough
* entropy from the RAND_seed() when TLS initializes and refuses
* to go further. Earlier versions of OpenSSL carried on regardless.
*/
srand((unsigned int) time((time_t *) NULL));
do {
for (i = 0; i < 16; i++) {
rnd_seed[i] = 1 + (char) (255.0 * rand()/(RAND_MAX+1.0));
}
RAND_seed(rnd_seed, sizeof(rnd_seed));
} while (RAND_status() != 1);
Tcl_CreateObjCommand(interp, "tls::ciphers", CiphersObjCmd,
(ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
Tcl_CreateObjCommand(interp, "tls::handshake", HandshakeObjCmd,
(ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
Tcl_CreateObjCommand(interp, "tls::import", ImportObjCmd,
(ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
Tcl_CreateObjCommand(interp, "tls::status", StatusObjCmd,
(ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
return Tcl_PkgProvide(interp, PACKAGE, VERSION);
}
/*
*------------------------------------------------------*
*
* Tls_SafeInit --
*
* ------------------------------------------------*
* Standard procedure required by 'load'.
* Initializes this extension for a safe interpreter.
* ------------------------------------------------*
*
* Sideeffects:
* As of 'Tls_Init'
*
* Result:
* A standard Tcl error code.
*
*------------------------------------------------------*
*/
int
Tls_SafeInit (Tcl_Interp* interp)
{
return Tls_Init (interp);
}