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openssl/ssl/ssl_conf.c
Neil Horman 32185d513c Fix second error from Coverity-161057 
Coverity flagged a second error in this code

we're comparing block_padding and hs_padding for >= 0, which is always
true

With the change to the use of strtoul, inputs that are preceded with a -
(i.e. negative values), are caught already, so the check is redundant

just remove the check entirely

Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
(Merged from https://github.com/openssl/openssl/pull/24993)
2024-07-26 13:25:18 -04:00

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/*
* Copyright 2012-2024 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "ssl_local.h"
#include <openssl/conf.h>
#include <openssl/objects.h>
#include <openssl/decoder.h>
#include <openssl/core_dispatch.h>
#include "internal/nelem.h"
/*
* structure holding name tables. This is used for permitted elements in lists
* such as TLSv1.
*/
typedef struct {
const char *name;
int namelen;
unsigned int name_flags;
uint64_t option_value;
} ssl_flag_tbl;
/* Switch table: use for single command line switches like no_tls2 */
typedef struct {
uint64_t option_value;
unsigned int name_flags;
} ssl_switch_tbl;
/* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
#define SSL_TFLAG_INV 0x1
/* Mask for type of flag referred to */
#define SSL_TFLAG_TYPE_MASK 0xf00
/* Flag is for options */
#define SSL_TFLAG_OPTION 0x000
/* Flag is for cert_flags */
#define SSL_TFLAG_CERT 0x100
/* Flag is for verify mode */
#define SSL_TFLAG_VFY 0x200
/* Option can only be used for clients */
#define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
/* Option can only be used for servers */
#define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
#define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
#define SSL_FLAG_TBL(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
#define SSL_FLAG_TBL_SRV(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
#define SSL_FLAG_TBL_CLI(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
#define SSL_FLAG_TBL_INV(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
#define SSL_FLAG_TBL_SRV_INV(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
#define SSL_FLAG_TBL_CERT(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
#define SSL_FLAG_VFY_CLI(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_CLIENT, flag}
#define SSL_FLAG_VFY_SRV(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_SERVER, flag}
/*
* Opaque structure containing SSL configuration context.
*/
struct ssl_conf_ctx_st {
/*
* Various flags indicating (among other things) which options we will
* recognise.
*/
unsigned int flags;
/* Prefix and length of commands */
char *prefix;
size_t prefixlen;
/* SSL_CTX or SSL structure to perform operations on */
SSL_CTX *ctx;
SSL *ssl;
/* Pointer to SSL or SSL_CTX options field or NULL if none */
uint64_t *poptions;
/* Certificate filenames for each type */
char *cert_filename[SSL_PKEY_NUM];
/* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
uint32_t *pcert_flags;
/* Pointer to SSL or SSL_CTX verify_mode or NULL if none */
uint32_t *pvfy_flags;
/* Pointer to SSL or SSL_CTX min_version field or NULL if none */
int *min_version;
/* Pointer to SSL or SSL_CTX max_version field or NULL if none */
int *max_version;
/* Current flag table being worked on */
const ssl_flag_tbl *tbl;
/* Size of table */
size_t ntbl;
/* Client CA names */
STACK_OF(X509_NAME) *canames;
};
static void ssl_set_option(SSL_CONF_CTX *cctx, unsigned int name_flags,
uint64_t option_value, int onoff)
{
uint32_t *pflags;
if (cctx->poptions == NULL)
return;
if (name_flags & SSL_TFLAG_INV)
onoff ^= 1;
switch (name_flags & SSL_TFLAG_TYPE_MASK) {
case SSL_TFLAG_CERT:
pflags = cctx->pcert_flags;
break;
case SSL_TFLAG_VFY:
pflags = cctx->pvfy_flags;
break;
case SSL_TFLAG_OPTION:
if (onoff)
*cctx->poptions |= option_value;
else
*cctx->poptions &= ~option_value;
return;
default:
return;
}
if (onoff)
*pflags |= option_value;
else
*pflags &= ~option_value;
}
static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
const char *name, int namelen, int onoff)
{
/* If name not relevant for context skip */
if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
return 0;
if (namelen == -1) {
if (strcmp(tbl->name, name))
return 0;
} else if (tbl->namelen != namelen
|| OPENSSL_strncasecmp(tbl->name, name, namelen))
return 0;
ssl_set_option(cctx, tbl->name_flags, tbl->option_value, onoff);
return 1;
}
static int ssl_set_option_list(const char *elem, int len, void *usr)
{
SSL_CONF_CTX *cctx = usr;
size_t i;
const ssl_flag_tbl *tbl;
int onoff = 1;
/*
* len == -1 indicates not being called in list context, just for single
* command line switches, so don't allow +, -.
*/
if (elem == NULL)
return 0;
if (len != -1) {
if (*elem == '+') {
elem++;
len--;
onoff = 1;
} else if (*elem == '-') {
elem++;
len--;
onoff = 0;
}
}
for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++) {
if (ssl_match_option(cctx, tbl, elem, len, onoff))
return 1;
}
return 0;
}
/* Set supported signature algorithms */
static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
{
int rv;
if (cctx->ssl)
rv = SSL_set1_sigalgs_list(cctx->ssl, value);
/* NB: ctx == NULL performs syntax checking only */
else
rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
return rv > 0;
}
/* Set supported client signature algorithms */
static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
{
int rv;
if (cctx->ssl)
rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
/* NB: ctx == NULL performs syntax checking only */
else
rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
return rv > 0;
}
static int cmd_Groups(SSL_CONF_CTX *cctx, const char *value)
{
int rv;
if (cctx->ssl)
rv = SSL_set1_groups_list(cctx->ssl, value);
/* NB: ctx == NULL performs syntax checking only */
else
rv = SSL_CTX_set1_groups_list(cctx->ctx, value);
return rv > 0;
}
/* This is the old name for cmd_Groups - retained for backwards compatibility */
static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
{
return cmd_Groups(cctx, value);
}
/* ECDH temporary parameters */
static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
{
int rv = 1;
/* Ignore values supported by 1.0.2 for the automatic selection */
if ((cctx->flags & SSL_CONF_FLAG_FILE)
&& (OPENSSL_strcasecmp(value, "+automatic") == 0
|| OPENSSL_strcasecmp(value, "automatic") == 0))
return 1;
if ((cctx->flags & SSL_CONF_FLAG_CMDLINE) &&
strcmp(value, "auto") == 0)
return 1;
/* ECDHParameters accepts a single group name */
if (strchr(value, ':') != NULL)
return 0;
if (cctx->ctx)
rv = SSL_CTX_set1_groups_list(cctx->ctx, value);
else if (cctx->ssl)
rv = SSL_set1_groups_list(cctx->ssl, value);
return rv > 0;
}
static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
{
int rv = 1;
if (cctx->ctx)
rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
if (cctx->ssl)
rv = SSL_set_cipher_list(cctx->ssl, value);
return rv > 0;
}
static int cmd_Ciphersuites(SSL_CONF_CTX *cctx, const char *value)
{
int rv = 1;
if (cctx->ctx)
rv = SSL_CTX_set_ciphersuites(cctx->ctx, value);
if (cctx->ssl)
rv = SSL_set_ciphersuites(cctx->ssl, value);
return rv > 0;
}
static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
{
static const ssl_flag_tbl ssl_protocol_list[] = {
SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2),
SSL_FLAG_TBL_INV("TLSv1.3", SSL_OP_NO_TLSv1_3),
SSL_FLAG_TBL_INV("DTLSv1", SSL_OP_NO_DTLSv1),
SSL_FLAG_TBL_INV("DTLSv1.2", SSL_OP_NO_DTLSv1_2)
};
cctx->tbl = ssl_protocol_list;
cctx->ntbl = OSSL_NELEM(ssl_protocol_list);
return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
}
/*
* protocol_from_string - converts a protocol version string to a number
*
* Returns -1 on failure or the version on success
*/
static int protocol_from_string(const char *value)
{
struct protocol_versions {
const char *name;
int version;
};
/*
* Note: To avoid breaking previously valid configurations, we must retain
* legacy entries in this table even if the underlying protocol is no
* longer supported. This also means that the constants SSL3_VERSION, ...
* need to be retained indefinitely. This table can only grow, never
* shrink.
*/
static const struct protocol_versions versions[] = {
{"None", 0},
{"SSLv3", SSL3_VERSION},
{"TLSv1", TLS1_VERSION},
{"TLSv1.1", TLS1_1_VERSION},
{"TLSv1.2", TLS1_2_VERSION},
{"TLSv1.3", TLS1_3_VERSION},
{"DTLSv1", DTLS1_VERSION},
{"DTLSv1.2", DTLS1_2_VERSION}
};
size_t i;
size_t n = OSSL_NELEM(versions);
for (i = 0; i < n; i++)
if (strcmp(versions[i].name, value) == 0)
return versions[i].version;
return -1;
}
static int min_max_proto(SSL_CONF_CTX *cctx, const char *value, int *bound)
{
int method_version;
int new_version;
if (cctx->ctx != NULL)
method_version = cctx->ctx->method->version;
else if (cctx->ssl != NULL)
method_version = cctx->ssl->defltmeth->version;
else
return 0;
if ((new_version = protocol_from_string(value)) < 0)
return 0;
return ssl_set_version_bound(method_version, new_version, bound);
}
/*
* cmd_MinProtocol - Set min protocol version
* @cctx: config structure to save settings in
* @value: The min protocol version in string form
*
* Returns 1 on success and 0 on failure.
*/
static int cmd_MinProtocol(SSL_CONF_CTX *cctx, const char *value)
{
return min_max_proto(cctx, value, cctx->min_version);
}
/*
* cmd_MaxProtocol - Set max protocol version
* @cctx: config structure to save settings in
* @value: The max protocol version in string form
*
* Returns 1 on success and 0 on failure.
*/
static int cmd_MaxProtocol(SSL_CONF_CTX *cctx, const char *value)
{
return min_max_proto(cctx, value, cctx->max_version);
}
static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
{
static const ssl_flag_tbl ssl_option_list[] = {
SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
SSL_FLAG_TBL_INV("EmptyFragments",
SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
SSL_FLAG_TBL("UnsafeLegacyServerConnect",
SSL_OP_LEGACY_SERVER_CONNECT),
SSL_FLAG_TBL("ClientRenegotiation",
SSL_OP_ALLOW_CLIENT_RENEGOTIATION),
SSL_FLAG_TBL_INV("EncryptThenMac", SSL_OP_NO_ENCRYPT_THEN_MAC),
SSL_FLAG_TBL("NoRenegotiation", SSL_OP_NO_RENEGOTIATION),
SSL_FLAG_TBL("AllowNoDHEKEX", SSL_OP_ALLOW_NO_DHE_KEX),
SSL_FLAG_TBL("PreferNoDHEKEX", SSL_OP_PREFER_NO_DHE_KEX),
SSL_FLAG_TBL("PrioritizeChaCha", SSL_OP_PRIORITIZE_CHACHA),
SSL_FLAG_TBL("MiddleboxCompat", SSL_OP_ENABLE_MIDDLEBOX_COMPAT),
SSL_FLAG_TBL_INV("AntiReplay", SSL_OP_NO_ANTI_REPLAY),
SSL_FLAG_TBL_INV("ExtendedMasterSecret", SSL_OP_NO_EXTENDED_MASTER_SECRET),
SSL_FLAG_TBL_INV("CANames", SSL_OP_DISABLE_TLSEXT_CA_NAMES),
SSL_FLAG_TBL("KTLS", SSL_OP_ENABLE_KTLS),
SSL_FLAG_TBL_CERT("StrictCertCheck", SSL_CERT_FLAG_TLS_STRICT),
SSL_FLAG_TBL_INV("TxCertificateCompression", SSL_OP_NO_TX_CERTIFICATE_COMPRESSION),
SSL_FLAG_TBL_INV("RxCertificateCompression", SSL_OP_NO_RX_CERTIFICATE_COMPRESSION),
SSL_FLAG_TBL("KTLSTxZerocopySendfile", SSL_OP_ENABLE_KTLS_TX_ZEROCOPY_SENDFILE),
SSL_FLAG_TBL("IgnoreUnexpectedEOF", SSL_OP_IGNORE_UNEXPECTED_EOF),
};
if (value == NULL)
return -3;
cctx->tbl = ssl_option_list;
cctx->ntbl = OSSL_NELEM(ssl_option_list);
return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
}
static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
{
static const ssl_flag_tbl ssl_vfy_list[] = {
SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
SSL_FLAG_VFY_SRV("Require",
SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE),
SSL_FLAG_VFY_SRV("RequestPostHandshake",
SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE),
SSL_FLAG_VFY_SRV("RequirePostHandshake",
SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE |
SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
};
if (value == NULL)
return -3;
cctx->tbl = ssl_vfy_list;
cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
}
static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
{
int rv = 1;
CERT *c = NULL;
if (cctx->ctx != NULL) {
rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
c = cctx->ctx->cert;
}
if (cctx->ssl != NULL) {
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(cctx->ssl);
if (sc != NULL) {
rv = SSL_use_certificate_chain_file(cctx->ssl, value);
c = sc->cert;
} else {
rv = 0;
}
}
if (rv > 0 && c != NULL && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
OPENSSL_free(*pfilename);
*pfilename = OPENSSL_strdup(value);
if (*pfilename == NULL)
rv = 0;
}
return rv > 0;
}
static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
{
int rv = 1;
if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
return -2;
if (cctx->ctx)
rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
if (cctx->ssl)
rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
return rv > 0;
}
static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
{
int rv = 1;
if (cctx->ctx)
rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
return rv > 0;
}
static int do_store(SSL_CONF_CTX *cctx,
const char *CAfile, const char *CApath, const char *CAstore,
int verify_store)
{
CERT *cert;
X509_STORE **st;
SSL_CTX *ctx;
OSSL_LIB_CTX *libctx = NULL;
const char *propq = NULL;
if (cctx->ctx != NULL) {
cert = cctx->ctx->cert;
ctx = cctx->ctx;
} else if (cctx->ssl != NULL) {
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(cctx->ssl);
if (sc == NULL)
return 0;
cert = sc->cert;
ctx = cctx->ssl->ctx;
} else {
return 1;
}
if (ctx != NULL) {
libctx = ctx->libctx;
propq = ctx->propq;
}
st = verify_store ? &cert->verify_store : &cert->chain_store;
if (*st == NULL) {
*st = X509_STORE_new();
if (*st == NULL)
return 0;
}
if (CAfile != NULL && !X509_STORE_load_file_ex(*st, CAfile, libctx, propq))
return 0;
if (CApath != NULL && !X509_STORE_load_path(*st, CApath))
return 0;
if (CAstore != NULL && !X509_STORE_load_store_ex(*st, CAstore, libctx,
propq))
return 0;
return 1;
}
static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
{
return do_store(cctx, NULL, value, NULL, 0);
}
static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
{
return do_store(cctx, value, NULL, NULL, 0);
}
static int cmd_ChainCAStore(SSL_CONF_CTX *cctx, const char *value)
{
return do_store(cctx, NULL, NULL, value, 0);
}
static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
{
return do_store(cctx, NULL, value, NULL, 1);
}
static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
{
return do_store(cctx, value, NULL, NULL, 1);
}
static int cmd_VerifyCAStore(SSL_CONF_CTX *cctx, const char *value)
{
return do_store(cctx, NULL, NULL, value, 1);
}
static int cmd_RequestCAFile(SSL_CONF_CTX *cctx, const char *value)
{
if (cctx->canames == NULL)
cctx->canames = sk_X509_NAME_new_null();
if (cctx->canames == NULL)
return 0;
return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
}
static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
{
return cmd_RequestCAFile(cctx, value);
}
static int cmd_RequestCAPath(SSL_CONF_CTX *cctx, const char *value)
{
if (cctx->canames == NULL)
cctx->canames = sk_X509_NAME_new_null();
if (cctx->canames == NULL)
return 0;
return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
}
static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
{
return cmd_RequestCAPath(cctx, value);
}
static int cmd_RequestCAStore(SSL_CONF_CTX *cctx, const char *value)
{
if (cctx->canames == NULL)
cctx->canames = sk_X509_NAME_new_null();
if (cctx->canames == NULL)
return 0;
return SSL_add_store_cert_subjects_to_stack(cctx->canames, value);
}
static int cmd_ClientCAStore(SSL_CONF_CTX *cctx, const char *value)
{
return cmd_RequestCAStore(cctx, value);
}
static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
{
int rv = 0;
EVP_PKEY *dhpkey = NULL;
BIO *in = NULL;
SSL_CTX *sslctx = (cctx->ssl != NULL) ? cctx->ssl->ctx : cctx->ctx;
OSSL_DECODER_CTX *decoderctx = NULL;
if (cctx->ctx != NULL || cctx->ssl != NULL) {
in = BIO_new(BIO_s_file());
if (in == NULL)
goto end;
if (BIO_read_filename(in, value) <= 0)
goto end;
decoderctx
= OSSL_DECODER_CTX_new_for_pkey(&dhpkey, "PEM", NULL, "DH",
OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
sslctx->libctx, sslctx->propq);
if (decoderctx == NULL)
goto end;
ERR_set_mark();
while (!OSSL_DECODER_from_bio(decoderctx, in)
&& dhpkey == NULL
&& !BIO_eof(in));
OSSL_DECODER_CTX_free(decoderctx);
if (dhpkey == NULL) {
ERR_clear_last_mark();
goto end;
}
ERR_pop_to_mark();
} else {
return 1;
}
if (cctx->ctx != NULL) {
if ((rv = SSL_CTX_set0_tmp_dh_pkey(cctx->ctx, dhpkey)) > 0)
dhpkey = NULL;
}
if (cctx->ssl != NULL) {
if ((rv = SSL_set0_tmp_dh_pkey(cctx->ssl, dhpkey)) > 0)
dhpkey = NULL;
}
end:
EVP_PKEY_free(dhpkey);
BIO_free(in);
return rv > 0;
}
/*
* |value| input is "<number[,number]>"
* where the first number is the padding block size for
* application data, and the optional second is the
* padding block size for handshake messages
*/
static int cmd_RecordPadding(SSL_CONF_CTX *cctx, const char *value)
{
int rv = 0;
unsigned long block_padding = 0, hs_padding = 0;
char *commap = NULL, *copy = NULL;
char *endptr = NULL;
copy = OPENSSL_strdup(value);
if (copy == NULL)
return 0;
commap = strstr(copy, ",");
if (commap != NULL) {
*commap = '\0';
if (*(commap + 1) == '\0') {
OPENSSL_free(copy);
return 0;
}
if (!OPENSSL_strtoul(commap + 1, &endptr, 0, &hs_padding))
return 0;
}
if (!OPENSSL_strtoul(copy, &endptr, 0, &block_padding))
return 0;
if (commap == NULL)
hs_padding = block_padding;
OPENSSL_free(copy);
/*
* All we care about are non-negative values,
* the setters check the range
*/
if (cctx->ctx)
rv = SSL_CTX_set_block_padding_ex(cctx->ctx, (size_t)block_padding,
(size_t)hs_padding);
if (cctx->ssl)
rv = SSL_set_block_padding_ex(cctx->ssl, (size_t)block_padding,
(size_t)hs_padding);
return rv;
}
static int cmd_NumTickets(SSL_CONF_CTX *cctx, const char *value)
{
int rv = 0;
int num_tickets = atoi(value);
if (num_tickets >= 0) {
if (cctx->ctx)
rv = SSL_CTX_set_num_tickets(cctx->ctx, num_tickets);
if (cctx->ssl)
rv = SSL_set_num_tickets(cctx->ssl, num_tickets);
}
return rv;
}
typedef struct {
int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
const char *str_file;
const char *str_cmdline;
unsigned short flags;
unsigned short value_type;
} ssl_conf_cmd_tbl;
/* Table of supported parameters */
#define SSL_CONF_CMD(name, cmdopt, flags, type) \
{cmd_##name, #name, cmdopt, flags, type}
#define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
#define SSL_CONF_CMD_SWITCH(name, flags) \
{0, NULL, name, flags, SSL_CONF_TYPE_NONE}
/* See apps/include/opt.h if you change this table. */
/* The SSL_CONF_CMD_SWITCH should be the same order as ssl_cmd_switches */
static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
SSL_CONF_CMD_SWITCH("no_ssl3", 0),
SSL_CONF_CMD_SWITCH("no_tls1", 0),
SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
SSL_CONF_CMD_SWITCH("no_tls1_3", 0),
SSL_CONF_CMD_SWITCH("bugs", 0),
SSL_CONF_CMD_SWITCH("no_comp", 0),
SSL_CONF_CMD_SWITCH("comp", 0),
SSL_CONF_CMD_SWITCH("no_tx_cert_comp", 0),
SSL_CONF_CMD_SWITCH("tx_cert_comp", 0),
SSL_CONF_CMD_SWITCH("no_rx_cert_comp", 0),
SSL_CONF_CMD_SWITCH("rx_cert_comp", 0),
SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
SSL_CONF_CMD_SWITCH("no_ticket", 0),
SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
SSL_CONF_CMD_SWITCH("client_renegotiation", SSL_CONF_FLAG_SERVER),
SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_CLIENT),
SSL_CONF_CMD_SWITCH("no_renegotiation", 0),
SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_CLIENT),
SSL_CONF_CMD_SWITCH("allow_no_dhe_kex", 0),
SSL_CONF_CMD_SWITCH("prefer_no_dhe_kex", 0),
SSL_CONF_CMD_SWITCH("prioritize_chacha", SSL_CONF_FLAG_SERVER),
SSL_CONF_CMD_SWITCH("strict", 0),
SSL_CONF_CMD_SWITCH("no_middlebox", 0),
SSL_CONF_CMD_SWITCH("anti_replay", SSL_CONF_FLAG_SERVER),
SSL_CONF_CMD_SWITCH("no_anti_replay", SSL_CONF_FLAG_SERVER),
SSL_CONF_CMD_SWITCH("no_etm", 0),
SSL_CONF_CMD_SWITCH("no_ems", 0),
SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
SSL_CONF_CMD_STRING(Curves, "curves", 0),
SSL_CONF_CMD_STRING(Groups, "groups", 0),
SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
SSL_CONF_CMD_STRING(Ciphersuites, "ciphersuites", 0),
SSL_CONF_CMD_STRING(Protocol, NULL, 0),
SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", 0),
SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", 0),
SSL_CONF_CMD_STRING(Options, NULL, 0),
SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_FILE),
SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_FILE),
SSL_CONF_CMD(ServerInfoFile, NULL,
SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_FILE),
SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_DIR),
SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_FILE),
SSL_CONF_CMD(ChainCAStore, "chainCAstore", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_STORE),
SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_DIR),
SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_FILE),
SSL_CONF_CMD(VerifyCAStore, "verifyCAstore", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_STORE),
SSL_CONF_CMD(RequestCAFile, "requestCAFile", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_FILE),
SSL_CONF_CMD(ClientCAFile, NULL,
SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_FILE),
SSL_CONF_CMD(RequestCAPath, NULL, SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_DIR),
SSL_CONF_CMD(ClientCAPath, NULL,
SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_DIR),
SSL_CONF_CMD(RequestCAStore, "requestCAStore", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_STORE),
SSL_CONF_CMD(ClientCAStore, NULL,
SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_STORE),
SSL_CONF_CMD(DHParameters, "dhparam",
SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_FILE),
SSL_CONF_CMD_STRING(RecordPadding, "record_padding", 0),
SSL_CONF_CMD_STRING(NumTickets, "num_tickets", SSL_CONF_FLAG_SERVER),
};
/* Supported switches: must match order of switches in ssl_conf_cmds */
static const ssl_switch_tbl ssl_cmd_switches[] = {
{SSL_OP_NO_SSLv3, 0}, /* no_ssl3 */
{SSL_OP_NO_TLSv1, 0}, /* no_tls1 */
{SSL_OP_NO_TLSv1_1, 0}, /* no_tls1_1 */
{SSL_OP_NO_TLSv1_2, 0}, /* no_tls1_2 */
{SSL_OP_NO_TLSv1_3, 0}, /* no_tls1_3 */
{SSL_OP_ALL, 0}, /* bugs */
{SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
{SSL_OP_NO_COMPRESSION, SSL_TFLAG_INV}, /* comp */
{SSL_OP_NO_TX_CERTIFICATE_COMPRESSION, 0}, /* no_tx_cert_comp */
{SSL_OP_NO_TX_CERTIFICATE_COMPRESSION, SSL_TFLAG_INV}, /* tx_cert_comp */
{SSL_OP_NO_RX_CERTIFICATE_COMPRESSION, 0}, /* no_rx_cert_comp */
{SSL_OP_NO_RX_CERTIFICATE_COMPRESSION, SSL_TFLAG_INV}, /* rx_cert_comp */
{SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
{SSL_OP_NO_TICKET, 0}, /* no_ticket */
{SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
/* legacy_renegotiation */
{SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
/* Allow client renegotiation */
{SSL_OP_ALLOW_CLIENT_RENEGOTIATION, 0},
/* legacy_server_connect */
{SSL_OP_LEGACY_SERVER_CONNECT, 0},
/* no_renegotiation */
{SSL_OP_NO_RENEGOTIATION, 0},
/* no_resumption_on_reneg */
{SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
/* no_legacy_server_connect */
{SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
/* allow_no_dhe_kex */
{SSL_OP_ALLOW_NO_DHE_KEX, 0},
/* prefer_no_dhe_kex */
{SSL_OP_PREFER_NO_DHE_KEX, 0},
/* chacha reprioritization */
{SSL_OP_PRIORITIZE_CHACHA, 0},
{SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
/* no_middlebox */
{SSL_OP_ENABLE_MIDDLEBOX_COMPAT, SSL_TFLAG_INV},
/* anti_replay */
{SSL_OP_NO_ANTI_REPLAY, SSL_TFLAG_INV},
/* no_anti_replay */
{SSL_OP_NO_ANTI_REPLAY, 0},
/* no Encrypt-then-Mac */
{SSL_OP_NO_ENCRYPT_THEN_MAC, 0},
/* no Extended master secret */
{SSL_OP_NO_EXTENDED_MASTER_SECRET, 0},
};
static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
{
if (pcmd == NULL || *pcmd == NULL)
return 0;
/* If a prefix is set, check and skip */
if (cctx->prefix) {
if (strlen(*pcmd) <= cctx->prefixlen)
return 0;
if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
return 0;
if (cctx->flags & SSL_CONF_FLAG_FILE &&
OPENSSL_strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
return 0;
*pcmd += cctx->prefixlen;
} else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
if (**pcmd != '-' || !(*pcmd)[1])
return 0;
*pcmd += 1;
}
return 1;
}
/* Determine if a command is allowed according to cctx flags */
static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl *t)
{
unsigned int tfl = t->flags;
unsigned int cfl = cctx->flags;
if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
return 0;
if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
return 0;
if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
&& !(cfl & SSL_CONF_FLAG_CERTIFICATE))
return 0;
return 1;
}
static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
const char *cmd)
{
const ssl_conf_cmd_tbl *t;
size_t i;
if (cmd == NULL)
return NULL;
/* Look for matching parameter name in table */
for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
if (ssl_conf_cmd_allowed(cctx, t)) {
if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
return t;
}
if (cctx->flags & SSL_CONF_FLAG_FILE) {
if (t->str_file && OPENSSL_strcasecmp(t->str_file, cmd) == 0)
return t;
}
}
}
return NULL;
}
static int ctrl_switch_option(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl *cmd)
{
/* Find index of command in table */
size_t idx = cmd - ssl_conf_cmds;
const ssl_switch_tbl *scmd;
/* Sanity check index */
if (idx >= OSSL_NELEM(ssl_cmd_switches)) {
ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
return 0;
}
/* Obtain switches entry with same index */
scmd = ssl_cmd_switches + idx;
ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
return 1;
}
int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
{
const ssl_conf_cmd_tbl *runcmd;
if (cmd == NULL) {
ERR_raise(ERR_LIB_SSL, SSL_R_INVALID_NULL_CMD_NAME);
return 0;
}
if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
goto unknown_cmd;
runcmd = ssl_conf_cmd_lookup(cctx, cmd);
if (runcmd) {
int rv = -3;
if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
return ctrl_switch_option(cctx, runcmd);
}
if (value == NULL)
goto bad_value;
rv = runcmd->cmd(cctx, value);
if (rv > 0)
return 2;
if (rv != -2)
rv = 0;
bad_value:
if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS)
ERR_raise_data(ERR_LIB_SSL, SSL_R_BAD_VALUE,
"cmd=%s, value=%s", cmd,
value != NULL ? value : "<EMPTY>");
return rv;
}
unknown_cmd:
if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS)
ERR_raise_data(ERR_LIB_SSL, SSL_R_UNKNOWN_CMD_NAME, "cmd=%s", cmd);
return -2;
}
int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
{
int rv;
const char *arg = NULL, *argn;
if (pargc != NULL && *pargc == 0)
return 0;
if (pargc == NULL || *pargc > 0)
arg = **pargv;
if (arg == NULL)
return 0;
if (pargc == NULL || *pargc > 1)
argn = (*pargv)[1];
else
argn = NULL;
cctx->flags &= ~SSL_CONF_FLAG_FILE;
cctx->flags |= SSL_CONF_FLAG_CMDLINE;
rv = SSL_CONF_cmd(cctx, arg, argn);
if (rv > 0) {
/* Success: update pargc, pargv */
(*pargv) += rv;
if (pargc)
(*pargc) -= rv;
return rv;
}
/* Unknown switch: indicate no arguments processed */
if (rv == -2)
return 0;
/* Some error occurred processing command, return fatal error */
if (rv == 0)
return -1;
return rv;
}
int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
{
if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
const ssl_conf_cmd_tbl *runcmd;
runcmd = ssl_conf_cmd_lookup(cctx, cmd);
if (runcmd)
return runcmd->value_type;
}
return SSL_CONF_TYPE_UNKNOWN;
}
SSL_CONF_CTX *SSL_CONF_CTX_new(void)
{
SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
return ret;
}
int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
{
/* See if any certificates are missing private keys */
size_t i;
CERT *c = NULL;
if (cctx->ctx != NULL) {
c = cctx->ctx->cert;
} else if (cctx->ssl != NULL) {
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(cctx->ssl);
if (sc != NULL)
c = sc->cert;
}
if (c != NULL && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
for (i = 0; i < SSL_PKEY_NUM; i++) {
const char *p = cctx->cert_filename[i];
/*
* If missing private key try to load one from certificate file
*/
if (p && !c->pkeys[i].privatekey) {
if (!cmd_PrivateKey(cctx, p))
return 0;
}
}
}
if (cctx->canames) {
if (cctx->ssl)
SSL_set0_CA_list(cctx->ssl, cctx->canames);
else if (cctx->ctx)
SSL_CTX_set0_CA_list(cctx->ctx, cctx->canames);
else
sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
cctx->canames = NULL;
}
return 1;
}
void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
{
if (cctx) {
size_t i;
for (i = 0; i < SSL_PKEY_NUM; i++)
OPENSSL_free(cctx->cert_filename[i]);
OPENSSL_free(cctx->prefix);
sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
OPENSSL_free(cctx);
}
}
unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
{
cctx->flags |= flags;
return cctx->flags;
}
unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
{
cctx->flags &= ~flags;
return cctx->flags;
}
int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
{
char *tmp = NULL;
if (pre) {
tmp = OPENSSL_strdup(pre);
if (tmp == NULL)
return 0;
}
OPENSSL_free(cctx->prefix);
cctx->prefix = tmp;
if (tmp)
cctx->prefixlen = strlen(tmp);
else
cctx->prefixlen = 0;
return 1;
}
void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
{
cctx->ssl = ssl;
cctx->ctx = NULL;
if (ssl != NULL) {
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(ssl);
if (sc == NULL)
return;
cctx->poptions = &sc->options;
cctx->min_version = &sc->min_proto_version;
cctx->max_version = &sc->max_proto_version;
cctx->pcert_flags = &sc->cert->cert_flags;
cctx->pvfy_flags = &sc->verify_mode;
} else {
cctx->poptions = NULL;
cctx->min_version = NULL;
cctx->max_version = NULL;
cctx->pcert_flags = NULL;
cctx->pvfy_flags = NULL;
}
}
void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
{
cctx->ctx = ctx;
cctx->ssl = NULL;
if (ctx) {
cctx->poptions = &ctx->options;
cctx->min_version = &ctx->min_proto_version;
cctx->max_version = &ctx->max_proto_version;
cctx->pcert_flags = &ctx->cert->cert_flags;
cctx->pvfy_flags = &ctx->verify_mode;
} else {
cctx->poptions = NULL;
cctx->min_version = NULL;
cctx->max_version = NULL;
cctx->pcert_flags = NULL;
cctx->pvfy_flags = NULL;
}
}
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