TclTLS
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Comment:Improved key and iv storage to use zero padded buffer to ensure no buffer overrun in OpenSSL API if string pointer is used. Added cipher default option for encrypt and decrypt. Pass data as last arg without -data option.
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SHA3-256: 191f8b29bcc65c287bbc1992f4af579dbde3afbbb5872866fda2e77fd1f1c0dd
User & Date: bohagan on 2023-12-04 00:30:53
Other Links: branch diff | manifest | tags
Context
2023-12-04
03:56
Split list operations into separate functions to make it easier for OpenSSL 3.0 changes. Added pkey list function. Added mac info and pkey info placeholder functions. More checks for NULL pointers. Moved legacy load ciphers and digest to init routine. check-in: 9e6e94200c user: bohagan tags: crypto
00:30
Improved key and iv storage to use zero padded buffer to ensure no buffer overrun in OpenSSL API if string pointer is used. Added cipher default option for encrypt and decrypt. Pass data as last arg without -data option. check-in: 191f8b29bc user: bohagan tags: crypto
2023-12-03
05:44
Updated documentation for encrypt and decrypt commands check-in: 193afd38ea user: bohagan tags: crypto
Changes
Side-by-Side Diff Ignore Whitespace Patch
Modified generic/tlsEncrypt.c from [ad8deb9393] to [2a45eea685].
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 *	No result or error message
 *
 *-------------------------------------------------------------------
 */
int EncryptInitialize(Tcl_Interp *interp, int type, EVP_CIPHER_CTX **ctx,
	Tcl_Obj *cipherObj, Tcl_Obj *keyObj, Tcl_Obj *ivObj) {
    const EVP_CIPHER *cipher;
    char *cipherName =  NULL, *key = NULL, *iv = NULL;
    int cipher_len = 0, key_len = 0, iv_len = 0, res;
    char *cipherName =  NULL, *keyString = NULL, *ivString = NULL;
    int cipher_len = 0, key_len = 0, iv_len = 0, res, max;
    unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];

    dprintf("Called");

    /* Init buffers */
    memset(key, 0, EVP_MAX_KEY_LENGTH);
    memset(iv, 0, EVP_MAX_IV_LENGTH);

    /* Get encryption parameters */
    if (cipherObj != NULL) {
	cipherName = Tcl_GetStringFromObj(cipherObj, &cipher_len);
    }
    if (keyObj != NULL) {
	key = Tcl_GetStringFromObj(keyObj, &key_len);
	keyString = Tcl_GetByteArrayFromObj(keyObj, &key_len);
    }
    if (ivObj != NULL) {
	iv = Tcl_GetStringFromObj(ivObj, &iv_len);
	ivString = Tcl_GetByteArrayFromObj(ivObj, &iv_len);
    }

    /* Get cipher name */
#if OPENSSL_VERSION_NUMBER < 0x30000000L
    cipher = EVP_get_cipherbyname(cipherName);
#else
    cipher = EVP_CIPHER_fetch(NULL, cipherName, NULL);
#endif
    if (cipher == NULL) {
	Tcl_AppendResult(interp, "Invalid cipher: \"", cipherName, "\"", NULL);
	return TCL_ERROR;
    }

    if (key_len > 0) {
#if OPENSSL_VERSION_NUMBER < 0x30000000L
	max = EVP_CIPHER_key_length(cipher);
#else
	max = EVP_CIPHER_get_key_length(cipher);
#endif
	if (max == 0) {
	} else if (key_len <= max) {
	    memcpy((void *) key, (const void *) keyString, (size_t) key_len);
	} else {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf("Key too long. Must be <= %d bytes", max));
	    return TCL_ERROR;
	}
    }

    if (iv_len > 0) {
#if OPENSSL_VERSION_NUMBER < 0x30000000L
	max = EVP_CIPHER_iv_length(cipher);
#else
	max = EVP_CIPHER_get_iv_length(cipher);
#endif
	if (max == 0) {
	} else if (iv_len <= max) {
	    memcpy((void *) iv, (const void *) ivString, (size_t) iv_len);
	} else {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf("IV too long. Must be <= %d bytes", max));
	    return TCL_ERROR;
	}
    }

    /* Create and initialize the context */
    if((*ctx = EVP_CIPHER_CTX_new()) == NULL) {
	Tcl_AppendResult(interp, "Memory allocation error", (char *) NULL);
	return TCL_ERROR;
    }
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 *
 *-------------------------------------------------------------------
 */
static int EncryptMain(int type, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
    Tcl_Obj *cipherObj = NULL, *cmdObj = NULL, *dataObj = NULL, *digestObj = NULL;
    Tcl_Obj *inFileObj = NULL, *outFileObj = NULL, *keyObj = NULL, *ivObj = NULL, *macObj = NULL;
    const char *channel = NULL, *opt;
    int res;
    int idx, res, start = 1;

    dprintf("Called");

    /* Clear interp result */
    Tcl_ResetResult(interp);

    /* Validate arg count */
    if (objc < 3 || objc > 12) {
	Tcl_WrongNumArgs(interp, 1, objv, "-cipher name ?-digest name? -key key ?-iv string? ?-mac name? [-channel chan | -command cmdName | -infile filename -outfile filename | -data data]");
	return TCL_ERROR;
    }

    /* Special case of first arg is cipher */
    opt = Tcl_GetStringFromObj(objv[start], NULL);
    if (opt[0] != '-') {
	if (type == TYPE_ENCRYPT || type == TYPE_DECRYPT) {
	    cipherObj = objv[start];
	    start++;
	}
    }

    /* Get options */
    for (int idx = 1; idx < objc; idx++) {
    for (idx = start; idx < objc; idx++) {
	opt = Tcl_GetStringFromObj(objv[idx], NULL);

	if (opt[0] != '-') {
	    break;
	}

	OPTSTR("-chan", channel);
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	OPTOBJ("-key", keyObj);
	OPTOBJ("-iv", ivObj);
	OPTOBJ("-mac", macObj);

	OPTBAD("option", "-chan, -channel, -cipher, -command, -data, -digest, -infile, -key, -iv, -mac, -outfile");
	return TCL_ERROR;
    }

    /* If only 1 arg left, it's the data */
    if (idx < objc && dataObj == NULL) {
	dataObj = objv[idx];
    }

    /* Check for required options */
    if (cipherObj == NULL) {
	Tcl_AppendResult(interp, "No cipher", NULL);
    } else if (keyObj == NULL) {
	Tcl_AppendResult(interp, "No key", NULL);
	return TCL_ERROR;
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