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/*
* Copyright (C) 1997-1999 Matt Newman <[email protected]>
* some modifications:
* Copyright (C) 2000 Ajuba Solutions
* Copyright (C) 2002 ActiveState Corporation
* Copyright (C) 2004 Starfish Systems
* Copyright (C) 2023 Brian O'Hagan
*
* 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
*
|
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(((key) == NULL) ? (char *) NULL : \
Tcl_TranslateFileName(interp, (key), (dsp)))
#define REASON() ERR_reason_error_string(ERR_get_error())
static SSL_CTX *CTX_Init(State *statePtr, int isServer, int proto, char *key,
char *certfile, unsigned char *key_asn1, unsigned char *cert_asn1,
int key_asn1_len, int cert_asn1_len, char *CAdir, char *CAfile,
char *ciphers, char *DHparams);
char *ciphers, char *ciphersuites, int level, char *DHparams);
static int TlsLibInit(int uninitialize);
#define TLS_PROTO_SSL2 0x01
#define TLS_PROTO_SSL3 0x02
#define TLS_PROTO_TLS1 0x04
#define TLS_PROTO_TLS1_1 0x08
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* A standard Tcl result list.
*
* Side effects:
* constructs and destroys SSL context (CTX)
*
*-------------------------------------------------------------------
*/
static int
CiphersObjCmd(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
static const char *protocols[] = {
"ssl2", "ssl3", "tls1", "tls1.1", "tls1.2", "tls1.3", NULL
};
enum protocol {
TLS_SSL2, TLS_SSL3, TLS_TLS1, TLS_TLS1_1, TLS_TLS1_2, TLS_TLS1_3, TLS_NONE
};
Tcl_Obj *objPtr;
int index, verbose = 0;
int index, verbose = 0, use_supported = 0;
dprintf("Called");
if ((objc < 2) || (objc > 3)) {
Tcl_WrongNumArgs(interp, 1, objv, "protocol ?verbose?");
if ((objc < 2) || (objc > 4)) {
Tcl_WrongNumArgs(interp, 1, objv, "protocol ?verbose? ?supported?");
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;
}
if ((objc > 3) && Tcl_GetBooleanFromObj(interp, objv[3], &use_supported) != TCL_OK) {
return TCL_ERROR;
}
switch ((enum protocol)index) {
case TLS_SSL2:
#if OPENSSL_VERSION_NUMBER >= 0x10101000L || defined(NO_SSL2) || defined(OPENSSL_NO_SSL2)
#if OPENSSL_VERSION_NUMBER >= 0x10100000L || defined(NO_SSL2) || defined(OPENSSL_NO_SSL2)
Tcl_AppendResult(interp, protocols[index], ": protocol not supported", NULL);
return TCL_ERROR;
#else
ctx = SSL_CTX_new(SSLv2_method()); break;
#endif
case TLS_SSL3:
#if defined(NO_SSL3) || defined(OPENSSL_NO_SSL3)
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default:
break;
}
if (ctx == NULL) {
Tcl_AppendResult(interp, REASON(), NULL);
return TCL_ERROR;
}
ssl = SSL_new(ctx);
if (ssl == NULL) {
Tcl_AppendResult(interp, REASON(), 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 size_t 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';
break;
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(buf, -1));
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char *keyfile = NULL;
char *certfile = NULL;
unsigned char *key = NULL;
int key_len = 0;
unsigned char *cert = NULL;
int cert_len = 0;
char *ciphers = NULL;
char *ciphersuites = NULL;
char *CAfile = NULL;
char *CAdir = NULL;
char *DHparams = NULL;
char *model = NULL;
#ifndef OPENSSL_NO_TLSEXT
char *servername = NULL; /* hostname for Server Name Indication */
Tcl_Obj *alpn = NULL;
#endif
int ssl2 = 0, ssl3 = 0;
int tls1 = 1, tls1_1 = 1, tls1_2 = 1, tls1_3 = 1;
int proto = 0;
int proto = 0, level = -1;
int verify = 0, require = 0, request = 1;
dprintf("Called");
#if OPENSSL_VERSION_NUMBER < 0x10100000L && !defined(OPENSSL_NO_SSL2) && defined(NO_TLS1) && defined(NO_TLS1_1) && defined(NO_TLS1_2) && defined(NO_TLS1_3) && defined(NO_SSL3) && !defined(NO_SSL2)
ssl2 = 1;
#endif
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if (opt[0] != '-')
break;
OPTSTR("-cadir", CAdir);
OPTSTR("-cafile", CAfile);
OPTSTR("-certfile", certfile);
OPTSTR("-cipher", ciphers);
OPTSTR("-ciphers", ciphers);
OPTSTR("-ciphersuites", ciphersuites);
OPTOBJ("-command", script);
OPTSTR("-dhparams", DHparams);
OPTSTR("-keyfile", keyfile);
OPTSTR("-model", model);
OPTOBJ("-password", password);
OPTBOOL("-require", require);
OPTBOOL("-request", request);
OPTINT("-securitylevel", level);
OPTBOOL("-server", server);
#ifndef OPENSSL_NO_TLSEXT
OPTSTR("-servername", servername);
OPTOBJ("-alpn", alpn);
#endif
OPTBOOL("-ssl2", ssl2);
OPTBOOL("-ssl3", ssl3);
OPTBOOL("-tls1", tls1);
OPTBOOL("-tls1.1", tls1_1);
OPTBOOL("-tls1.2", tls1_2);
OPTBOOL("-tls1.3", tls1_3);
OPTBYTE("-cert", cert, cert_len);
OPTBYTE("-key", key, key_len);
OPTBAD("option", "-alpn, -cadir, -cafile, -cert, -certfile, -cipher, -command, -dhparams, -key, -keyfile, -model, -password, -require, -request, -server, -servername, -ssl2, -ssl3, -tls1, -tls1.1, -tls1.2, or -tls1.3");
OPTBAD("option", "-alpn, -cadir, -cafile, -cert, -certfile, -cipher, -ciphersuites, -command, -dhparams, -key, -keyfile, -model, -password, -require, -request, -securitylevel, -server, -servername, -ssl2, -ssl3, -tls1, -tls1.1, -tls1.2, or -tls1.3");
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);
proto |= (tls1_1 ? TLS_PROTO_TLS1_1 : 0);
proto |= (tls1_2 ? TLS_PROTO_TLS1_2 : 0);
proto |= (tls1_3 ? TLS_PROTO_TLS1_3 : 0);
/* reset to NULL if blank string provided */
if (cert && !*cert) cert = NULL;
if (key && !*key) key = NULL;
if (certfile && !*certfile) certfile = NULL;
if (keyfile && !*keyfile) keyfile = NULL;
if (ciphers && !*ciphers) ciphers = NULL;
if (ciphersuites && !*ciphersuites) ciphersuites = NULL;
if (CAfile && !*CAfile) CAfile = NULL;
if (CAdir && !*CAdir) CAdir = NULL;
if (DHparams && !*DHparams) DHparams = NULL;
/* new SSL state */
statePtr = (State *) ckalloc((unsigned) sizeof(State));
memset(statePtr, 0, sizeof(State));
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"\": not a TLS channel", NULL);
Tls_Free((char *) statePtr);
return TCL_ERROR;
}
ctx = ((State *)Tcl_GetChannelInstanceData(chan))->ctx;
} else {
if ((ctx = CTX_Init(statePtr, server, proto, keyfile, certfile, key, cert,
key_len, cert_len, CAdir, CAfile, ciphers, DHparams)) == (SSL_CTX*)0) {
key_len, cert_len, CAdir, CAfile, ciphers, ciphersuites, level, DHparams)) == (SSL_CTX*)0) {
Tls_Free((char *) statePtr);
return TCL_ERROR;
}
}
statePtr->ctx = ctx;
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Tls_Free((char *) statePtr);
return TCL_ERROR;
}
}
if (alpn) {
/* Convert a Tcl list into a protocol-list in wire-format */
unsigned char *protos, *p;
unsigned int protoslen = 0;
unsigned int protos_len = 0;
int i, len, cnt;
Tcl_Obj **list;
if (Tcl_ListObjGetElements(interp, alpn, &cnt, &list) != TCL_OK) {
Tls_Free((char *) statePtr);
return TCL_ERROR;
}
/* Determine the memory required for the protocol-list */
for (i = 0; i < cnt; i++) {
Tcl_GetStringFromObj(list[i], &len);
if (len > 255) {
Tcl_AppendResult(interp, "alpn protocol name too long", (char *) NULL);
Tls_Free((char *) statePtr);
return TCL_ERROR;
}
protoslen += 1 + len;
protos_len += 1 + len;
}
/* Build the complete protocol-list */
protos = ckalloc(protoslen);
protos = ckalloc(protos_len);
/* protocol-lists consist of 8-bit length-prefixed, byte strings */
for (i = 0, p = protos; i < cnt; i++) {
char *str = Tcl_GetStringFromObj(list[i], &len);
*p++ = len;
memcpy(p, str, len);
p += len;
}
/* Note: This functions reverses the return value convention */
if (SSL_set_alpn_protos(statePtr->ssl, protos, protoslen)) {
if (SSL_set_alpn_protos(statePtr->ssl, protos, protos_len)) {
Tcl_AppendResult(interp, "failed to set alpn protocols", (char *) NULL);
Tls_Free((char *) statePtr);
ckfree(protos);
return TCL_ERROR;
}
/* SSL_set_alpn_protos makes a copy of the protocol-list */
ckfree(protos);
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* constructs SSL context (CTX)
*
*-------------------------------------------------------------------
*/
static SSL_CTX *
CTX_Init(State *statePtr, int isServer, int proto, char *keyfile, char *certfile,
unsigned char *key, unsigned char *cert, int key_len, int cert_len, char *CAdir,
char *CAfile, char *ciphers, char *DHparams) {
char *CAfile, char *ciphers, char *ciphersuites, int level, char *DHparams) {
Tcl_Interp *interp = statePtr->interp;
SSL_CTX *ctx = NULL;
Tcl_DString ds;
Tcl_DString ds1;
int off = 0;
int load_private_key;
const SSL_METHOD *method;
dprintf("Called");
if (!proto) {
Tcl_AppendResult(interp, "no valid protocol selected", NULL);
return (SSL_CTX *)0;
}
/* create SSL context */
#if OPENSSL_VERSION_NUMBER >= 0x10101000L || defined(NO_SSL2) || defined(OPENSSL_NO_SSL2)
#if OPENSSL_VERSION_NUMBER >= 0x10100000L || defined(NO_SSL2) || defined(OPENSSL_NO_SSL2)
if (ENABLED(proto, TLS_PROTO_SSL2)) {
Tcl_AppendResult(interp, "SSL2 protocol not supported", NULL);
return (SSL_CTX *)0;
}
#endif
#if defined(NO_SSL3) || defined(OPENSSL_NO_SSL3)
if (ENABLED(proto, TLS_PROTO_SSL3)) {
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if (ENABLED(proto, TLS_PROTO_TLS1_3)) {
Tcl_AppendResult(interp, "TLS 1.3 protocol not supported", NULL);
return (SSL_CTX *)0;
}
#endif
switch (proto) {
#if OPENSSL_VERSION_NUMBER < 0x10101000L && !defined(NO_SSL2) && !defined(OPENSSL_NO_SSL2)
#if OPENSSL_VERSION_NUMBER < 0x10100000L && !defined(NO_SSL2) && !defined(OPENSSL_NO_SSL2)
case TLS_PROTO_SSL2:
method = SSLv2_method();
break;
#endif
#if !defined(NO_SSL3) && !defined(OPENSSL_NO_SSL3)
case TLS_PROTO_SSL3:
method = SSLv3_method();
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SSL_CTX_set_options(ctx, SSL_OP_ALL); /* all SSL bug workarounds */
SSL_CTX_set_options(ctx, off); /* disable protocol versions */
#if OPENSSL_VERSION_NUMBER < 0x10101000L
SSL_CTX_set_mode(ctx, SSL_MODE_AUTO_RETRY); /* handle new handshakes in background */
#endif
SSL_CTX_sess_set_cache_size(ctx, 128);
if (ciphers != NULL)
SSL_CTX_set_cipher_list(ctx, ciphers);
/* Set user defined ciphers, cipher suites, and security level */
if (((ciphers != NULL) && !SSL_CTX_set_cipher_list(ctx, ciphers)) || \
((ciphersuites != NULL) && !SSL_CTX_set_ciphersuites(ctx, ciphersuites))) {
Tcl_AppendResult(interp, "Set ciphers failed", (char *) NULL);
SSL_CTX_free(ctx);
return (SSL_CTX *)0;
}
/* Set security level */
if (level > -1 && level < 6) {
/* SSL_set_security_level */
SSL_CTX_set_security_level(ctx, level);
}
/* set some callbacks */
SSL_CTX_set_default_passwd_cb(ctx, PasswordCallback);
#ifndef BSAFE
SSL_CTX_set_default_passwd_cb_userdata(ctx, (void *)statePtr);
#endif
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/* Report the selected protocol as a result of the negotiation */
SSL_get0_alpn_selected(statePtr->ssl, &proto, &len);
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("alpn", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj((char *)proto, (int)len));
#endif
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("version", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_get_version(statePtr->ssl), -1));
Tcl_SetObjResult(interp, objPtr);
return TCL_OK;
clientData = clientData;
}
/*
*-------------------------------------------------------------------
*
* ConnectionInfoObjCmd -- return connection info from OpenSSL.
*
* Results:
* A list of connection info
*
*-------------------------------------------------------------------
*/
static int ConnectionInfoObjCmd(ClientData clientData, 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 */
Tcl_Obj *objPtr;
const SSL *ssl;
const SSL_CIPHER *cipher;
#if !defined(OPENSSL_NO_TLSEXT) && OPENSSL_VERSION_NUMBER >= 0x10002000L
const unsigned char *proto;
unsigned int len;
#endif
#if defined(HAVE_SSL_COMPRESSION) && OPENSSL_VERSION_NUMBER >= 0x10002000L
const COMP_METHOD *comp;
#endif
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);
}
/*
* 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);
}
objPtr = Tcl_NewListObj(0, NULL);
/* Get connection state */
statePtr = (State *)Tcl_GetChannelInstanceData(chan);
ssl = statePtr->ssl;
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("state", -1));
if (SSL_is_init_finished(ssl)) {
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("established", -1));
} else if (SSL_in_init(ssl)) {
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("handshake", -1));
} else {
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("initializing", -1));
}
/* Get server name */
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("servername", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name), -1));
/* Get protocol */
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("protocol", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_get_version(ssl), -1));
/* Get security level */
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("securitylevel", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(SSL_get_security_level(ssl)));
/* Get cipher */
cipher = SSL_get_current_cipher(ssl);
if (cipher != NULL) {
char buf[BUFSIZ] = {0};
int bits, alg_bits;
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("cipher", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_CIPHER_get_name(cipher), -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("standard_name", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_CIPHER_standard_name(cipher), -1));
bits = SSL_CIPHER_get_bits(cipher, &alg_bits);
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("bits", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(bits));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("secret_bits", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(alg_bits));
/* alg_bits is actual key secret bits. If use bits and secret (algorithm) bits differ,
the rest of the bits are fixed, i.e. for limited export ciphers (bits < 56) */
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("min_version", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_CIPHER_get_version(cipher), -1));
if (SSL_CIPHER_description(cipher, buf, sizeof(buf)) != NULL) {
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("description", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(buf, -1));
}
}
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("renegotiation", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(
SSL_get_secure_renegotiation_support(ssl) ? "allowed" : "disallowed", -1));
#if !defined(OPENSSL_NO_TLSEXT) && OPENSSL_VERSION_NUMBER >= 0x10002000L
/* Report the selected protocol as a result of the negotiation */
SSL_get0_alpn_selected(ssl, &proto, &len);
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("alpn", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj((char *)proto, (int)len));
#endif
/* Session info */
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("session_reused", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewIntObj(SSL_session_reused(ssl)));
#if defined(HAVE_SSL_COMPRESSION) && OPENSSL_VERSION_NUMBER >= 0x10002000L
/* Compression info */
comp = SSL_get_current_compression(ssl);
if (comp != NULL) {
expansion = SSL_get_current_expansion(ssl);
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("compression", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_COMP_get_name(comp), -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj("expansion", -1));
Tcl_ListObjAppendElement(interp, objPtr, Tcl_NewStringObj(SSL_COMP_get_name(expansion), -1));
}
#endif
Tcl_SetObjResult(interp, objPtr);
return TCL_OK;
clientData = clientData;
}
/*
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if (TlsLibInit(0) != TCL_OK) {
Tcl_AppendResult(interp, "could not initialize SSL library", NULL);
return TCL_ERROR;
}
Tcl_CreateObjCommand(interp, "tls::ciphers", CiphersObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
Tcl_CreateObjCommand(interp, "tls::connection", ConnectionInfoObjCmd, (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::unimport", UnimportObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
Tcl_CreateObjCommand(interp, "tls::status", StatusObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
Tcl_CreateObjCommand(interp, "tls::version", VersionObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
Tcl_CreateObjCommand(interp, "tls::misc", MiscObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
Tcl_CreateObjCommand(interp, "tls::protocols", ProtocolsObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
if (interp) {
Tcl_Eval(interp, tlsTclInitScript);
}
return(Tcl_PkgProvide(interp, "tls", PACKAGE_VERSION));
}
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