esp-idf/components/wpa_supplicant/src/wpa2/tls/tlsv1_cred.c

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/*
* TLSv1 credentials
* Copyright (c) 2006-2009, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "wpa/includes.h"
#include "wpa/common.h"
#include "wpa2/utils/base64.h"
#include "crypto/crypto.h"
#include "wpa2/tls/x509v3.h"
#include "wpa2/tls/tlsv1_cred.h"
struct tlsv1_credentials * tlsv1_cred_alloc(void)
{
struct tlsv1_credentials *cred;
cred = (struct tlsv1_credentials *)os_zalloc(sizeof(*cred));
return cred;
}
void tlsv1_cred_free(struct tlsv1_credentials *cred)
{
if (cred == NULL)
return;
x509_certificate_chain_free(cred->trusted_certs);
x509_certificate_chain_free(cred->cert);
crypto_private_key_free(cred->key);
os_free(cred->dh_p);
os_free(cred->dh_g);
os_free(cred);
}
static int tlsv1_add_cert_der(struct x509_certificate **chain,
const u8 *buf, size_t len)
{
struct x509_certificate *cert, *p;
char name[128];
cert = x509_certificate_parse(buf, len);
if (cert == NULL) {
wpa_printf(MSG_INFO, "TLSv1: %s - failed to parse certificate",
__func__);
return -1;
}
p = *chain;
while (p && p->next)
p = p->next;
if (p && x509_name_compare(&cert->subject, &p->issuer) == 0) {
/*
* The new certificate is the issuer of the last certificate in
* the chain - add the new certificate to the end.
*/
p->next = cert;
} else {
/* Add to the beginning of the chain */
cert->next = *chain;
*chain = cert;
}
x509_name_string(&cert->subject, name, sizeof(name));
wpa_printf(MSG_DEBUG, "TLSv1: Added certificate: %s", name);
return 0;
}
static const char *pem_cert_begin = "-----BEGIN CERTIFICATE-----";
static const char *pem_cert_end = "-----END CERTIFICATE-----";
static const char *pem_key_begin = "-----BEGIN RSA PRIVATE KEY-----";
static const char *pem_key_end = "-----END RSA PRIVATE KEY-----";
static const char *pem_key2_begin = "-----BEGIN PRIVATE KEY-----";
static const char *pem_key2_end = "-----END PRIVATE KEY-----";
static const char *pem_key_enc_begin = "-----BEGIN ENCRYPTED PRIVATE KEY-----";
static const char *pem_key_enc_end = "-----END ENCRYPTED PRIVATE KEY-----";
static const u8 * search_tag(const char *tag, const u8 *buf, size_t len)
{
size_t i, plen;
plen = os_strlen(tag);
if (len < plen)
return NULL;
for (i = 0; i < len - plen; i++) {
if (os_memcmp(buf + i, tag, plen) == 0)
return buf + i;
}
return NULL;
}
static int tlsv1_add_cert(struct x509_certificate **chain,
const u8 *buf, size_t len)
{
const u8 *pos, *end;
unsigned char *der;
size_t der_len;
pos = search_tag(pem_cert_begin, buf, len);
if (!pos) {
wpa_printf(MSG_DEBUG, "TLSv1: No PEM certificate tag found - "
"assume DER format");
return tlsv1_add_cert_der(chain, buf, len);
}
wpa_printf(MSG_DEBUG, "TLSv1: Converting PEM format certificate into "
"DER format");
while (pos) {
pos += os_strlen(pem_cert_begin);
end = search_tag(pem_cert_end, pos, buf + len - pos);
if (end == NULL) {
wpa_printf(MSG_INFO, "TLSv1: Could not find PEM "
"certificate end tag (%s)", pem_cert_end);
return -1;
}
der = base64_decode(pos, end - pos, &der_len);
if (der == NULL) {
wpa_printf(MSG_INFO, "TLSv1: Could not decode PEM "
"certificate");
return -1;
}
if (tlsv1_add_cert_der(chain, der, der_len) < 0) {
wpa_printf(MSG_INFO, "TLSv1: Failed to parse PEM "
"certificate after DER conversion");
os_free(der);
return -1;
}
os_free(der);
end += os_strlen(pem_cert_end);
pos = search_tag(pem_cert_begin, end, buf + len - end);
}
return 0;
}
static int tlsv1_set_cert_chain(struct x509_certificate **chain,
const char *cert, const u8 *cert_blob,
size_t cert_blob_len)
{
if (cert_blob)
return tlsv1_add_cert(chain, cert_blob, cert_blob_len);
if (cert) {
u8 *buf = NULL;
size_t len;
int ret;
//buf = (u8 *) os_readfile(cert, &len);
if (buf == NULL) {
wpa_printf(MSG_INFO, "TLSv1: Failed to read '%s'",
cert);
return -1;
}
ret = tlsv1_add_cert(chain, buf, len);
os_free(buf);
return ret;
}
return 0;
}
/**
* tlsv1_set_ca_cert - Set trusted CA certificate(s)
* @cred: TLSv1 credentials from tlsv1_cred_alloc()
* @cert: File or reference name for X.509 certificate in PEM or DER format
* @cert_blob: cert as inlined data or %NULL if not used
* @cert_blob_len: ca_cert_blob length
* @path: Path to CA certificates (not yet supported)
* Returns: 0 on success, -1 on failure
*/
int tlsv1_set_ca_cert(struct tlsv1_credentials *cred, const char *cert,
const u8 *cert_blob, size_t cert_blob_len,
const char *path)
{
if (tlsv1_set_cert_chain(&cred->trusted_certs, cert,
cert_blob, cert_blob_len) < 0)
return -1;
if (path) {
/* TODO: add support for reading number of certificate files */
wpa_printf(MSG_INFO, "TLSv1: Use of CA certificate directory "
"not yet supported");
return -1;
}
return 0;
}
/**
* tlsv1_set_cert - Set certificate
* @cred: TLSv1 credentials from tlsv1_cred_alloc()
* @cert: File or reference name for X.509 certificate in PEM or DER format
* @cert_blob: cert as inlined data or %NULL if not used
* @cert_blob_len: cert_blob length
* Returns: 0 on success, -1 on failure
*/
int tlsv1_set_cert(struct tlsv1_credentials *cred, const char *cert,
const u8 *cert_blob, size_t cert_blob_len)
{
return tlsv1_set_cert_chain(&cred->cert, cert,
cert_blob, cert_blob_len);
}
static struct crypto_private_key * tlsv1_set_key_pem(const u8 *key, size_t len)
{
const u8 *pos, *end;
unsigned char *der;
size_t der_len;
struct crypto_private_key *pkey;
pos = search_tag(pem_key_begin, key, len);
if (!pos) {
pos = search_tag(pem_key2_begin, key, len);
if (!pos)
return NULL;
pos += os_strlen(pem_key2_begin);
end = search_tag(pem_key2_end, pos, key + len - pos);
if (!end)
return NULL;
} else {
const u8 *pos2;
pos += os_strlen(pem_key_begin);
end = search_tag(pem_key_end, pos, key + len - pos);
if (!end)
return NULL;
pos2 = search_tag("Proc-Type: 4,ENCRYPTED", pos, end - pos);
if (pos2) {
wpa_printf(MSG_DEBUG, "TLSv1: Unsupported private key "
"format (Proc-Type/DEK-Info)");
return NULL;
}
}
der = base64_decode(pos, end - pos, &der_len);
if (!der)
return NULL;
pkey = crypto_private_key_import(der, der_len, NULL);
os_free(der);
return pkey;
}
static struct crypto_private_key * tlsv1_set_key_enc_pem(const u8 *key,
size_t len,
const char *passwd)
{
const u8 *pos, *end;
unsigned char *der;
size_t der_len;
struct crypto_private_key *pkey;
if (passwd == NULL)
return NULL;
pos = search_tag(pem_key_enc_begin, key, len);
if (!pos)
return NULL;
pos += os_strlen(pem_key_enc_begin);
end = search_tag(pem_key_enc_end, pos, key + len - pos);
if (!end)
return NULL;
der = base64_decode(pos, end - pos, &der_len);
if (!der)
return NULL;
pkey = crypto_private_key_import(der, der_len, passwd);
os_free(der);
return pkey;
}
static int tlsv1_set_key(struct tlsv1_credentials *cred,
const u8 *key, size_t len, const char *passwd)
{
cred->key = crypto_private_key_import(key, len, passwd);
if (cred->key == NULL)
cred->key = tlsv1_set_key_pem(key, len);
if (cred->key == NULL)
cred->key = tlsv1_set_key_enc_pem(key, len, passwd);
if (cred->key == NULL) {
wpa_printf(MSG_INFO, "TLSv1: Failed to parse private key");
return -1;
}
return 0;
}
/**
* tlsv1_set_private_key - Set private key
* @cred: TLSv1 credentials from tlsv1_cred_alloc()
* @private_key: File or reference name for the key in PEM or DER format
* @private_key_passwd: Passphrase for decrypted private key, %NULL if no
* passphrase is used.
* @private_key_blob: private_key as inlined data or %NULL if not used
* @private_key_blob_len: private_key_blob length
* Returns: 0 on success, -1 on failure
*/
int tlsv1_set_private_key(struct tlsv1_credentials *cred,
const char *private_key,
const char *private_key_passwd,
const u8 *private_key_blob,
size_t private_key_blob_len)
{
crypto_private_key_free(cred->key);
cred->key = NULL;
if (private_key_blob)
return tlsv1_set_key(cred, private_key_blob,
private_key_blob_len,
private_key_passwd);
if (private_key) {
u8 *buf = NULL;
size_t len;
int ret;
//buf = (u8 *) os_readfile(private_key, &len);
if (buf == NULL) {
wpa_printf(MSG_INFO, "TLSv1: Failed to read '%s'",
private_key);
return -1;
}
ret = tlsv1_set_key(cred, buf, len, private_key_passwd);
os_free(buf);
return ret;
}
return 0;
}
static int tlsv1_set_dhparams_der(struct tlsv1_credentials *cred,
const u8 *dh, size_t len)
{
struct asn1_hdr hdr;
const u8 *pos, *end;
pos = dh;
end = dh + len;
/*
* DHParameter ::= SEQUENCE {
* prime INTEGER, -- p
* base INTEGER, -- g
* privateValueLength INTEGER OPTIONAL }
*/
/* DHParamer ::= SEQUENCE */
if (asn1_get_next(pos, len, &hdr) < 0 ||
hdr.class != ASN1_CLASS_UNIVERSAL ||
hdr.tag != ASN1_TAG_SEQUENCE) {
wpa_printf(MSG_DEBUG, "DH: DH parameters did not start with a "
"valid SEQUENCE - found class %d tag 0x%x",
hdr.class, hdr.tag);
return -1;
}
pos = hdr.payload;
/* prime INTEGER */
if (asn1_get_next(pos, end - pos, &hdr) < 0)
return -1;
if (hdr.class != ASN1_CLASS_UNIVERSAL ||
hdr.tag != ASN1_TAG_INTEGER) {
wpa_printf(MSG_DEBUG, "DH: No INTEGER tag found for p; "
"class=%d tag=0x%x", hdr.class, hdr.tag);
return -1;
}
wpa_hexdump(MSG_MSGDUMP, "DH: prime (p)", hdr.payload, hdr.length);
if (hdr.length == 0)
return -1;
os_free(cred->dh_p);
cred->dh_p = os_malloc(hdr.length);
if (cred->dh_p == NULL)
return -1;
os_memcpy(cred->dh_p, hdr.payload, hdr.length);
cred->dh_p_len = hdr.length;
pos = hdr.payload + hdr.length;
/* base INTEGER */
if (asn1_get_next(pos, end - pos, &hdr) < 0)
return -1;
if (hdr.class != ASN1_CLASS_UNIVERSAL ||
hdr.tag != ASN1_TAG_INTEGER) {
wpa_printf(MSG_DEBUG, "DH: No INTEGER tag found for g; "
"class=%d tag=0x%x", hdr.class, hdr.tag);
return -1;
}
wpa_hexdump(MSG_MSGDUMP, "DH: base (g)", hdr.payload, hdr.length);
if (hdr.length == 0)
return -1;
os_free(cred->dh_g);
cred->dh_g = os_malloc(hdr.length);
if (cred->dh_g == NULL)
return -1;
os_memcpy(cred->dh_g, hdr.payload, hdr.length);
cred->dh_g_len = hdr.length;
return 0;
}
static const char *pem_dhparams_begin = "-----BEGIN DH PARAMETERS-----";
static const char *pem_dhparams_end = "-----END DH PARAMETERS-----";
static int tlsv1_set_dhparams_blob(struct tlsv1_credentials *cred,
const u8 *buf, size_t len)
{
const u8 *pos, *end;
unsigned char *der;
size_t der_len;
pos = search_tag(pem_dhparams_begin, buf, len);
if (!pos) {
wpa_printf(MSG_DEBUG, "TLSv1: No PEM dhparams tag found - "
"assume DER format");
return tlsv1_set_dhparams_der(cred, buf, len);
}
wpa_printf(MSG_DEBUG, "TLSv1: Converting PEM format dhparams into DER "
"format");
pos += os_strlen(pem_dhparams_begin);
end = search_tag(pem_dhparams_end, pos, buf + len - pos);
if (end == NULL) {
wpa_printf(MSG_INFO, "TLSv1: Could not find PEM dhparams end "
"tag (%s)", pem_dhparams_end);
return -1;
}
der = base64_decode(pos, end - pos, &der_len);
if (der == NULL) {
wpa_printf(MSG_INFO, "TLSv1: Could not decode PEM dhparams");
return -1;
}
if (tlsv1_set_dhparams_der(cred, der, der_len) < 0) {
wpa_printf(MSG_INFO, "TLSv1: Failed to parse PEM dhparams "
"DER conversion");
os_free(der);
return -1;
}
os_free(der);
return 0;
}
/**
* tlsv1_set_dhparams - Set Diffie-Hellman parameters
* @cred: TLSv1 credentials from tlsv1_cred_alloc()
* @dh_file: File or reference name for the DH params in PEM or DER format
* @dh_blob: DH params as inlined data or %NULL if not used
* @dh_blob_len: dh_blob length
* Returns: 0 on success, -1 on failure
*/
int tlsv1_set_dhparams(struct tlsv1_credentials *cred, const char *dh_file,
const u8 *dh_blob, size_t dh_blob_len)
{
if (dh_blob)
return tlsv1_set_dhparams_blob(cred, dh_blob, dh_blob_len);
if (dh_file) {
u8 *buf = NULL;
size_t len;
int ret;
//buf = (u8 *) os_readfile(dh_file, &len);
if (buf == NULL) {
wpa_printf(MSG_INFO, "TLSv1: Failed to read '%s'",
dh_file);
return -1;
}
ret = tlsv1_set_dhparams_blob(cred, buf, len);
os_free(buf);
return ret;
}
return 0;
}