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-rw-r--r--accel-pppd/accel-ppp.conf9
-rw-r--r--accel-pppd/ctrl/sstp/sstp.c188
-rw-r--r--accel-pppd/ctrl/sstp/sstp_prot.h4
3 files changed, 181 insertions, 20 deletions
diff --git a/accel-pppd/accel-ppp.conf b/accel-pppd/accel-ppp.conf
index ee9f7f5..a4a4a71 100644
--- a/accel-pppd/accel-ppp.conf
+++ b/accel-pppd/accel-ppp.conf
@@ -110,10 +110,13 @@ verbose=1
[sstp]
verbose=1
+#cert-hash-proto=sha1,sha256
+#cert-hash-sha1=
+#cert-hash-sha256=
#ssl=1
-#ssl_ciphers=HIGH:!aNULL:!kRSA:!PSK:!SRP:!MD5:!RC4
-#ssl_ca_file=/etc/ssl/sstp-ca.crt
-#ssl_pemfile=/etc/ssl/sstp.pem
+#ssl-ciphers=HIGH:!aNULL:!kRSA:!PSK:!SRP:!MD5:!RC4
+#ssl-ca-file=/etc/ssl/sstp-ca.crt
+#ssl-pemfile=/etc/ssl/sstp.pem
#timeout=60
#hello-interval=60
#ip-pool=sstp
diff --git a/accel-pppd/ctrl/sstp/sstp.c b/accel-pppd/ctrl/sstp/sstp.c
index a7c1335..281c332 100644
--- a/accel-pppd/ctrl/sstp/sstp.c
+++ b/accel-pppd/ctrl/sstp/sstp.c
@@ -71,6 +71,13 @@
#define PPP_F_ESCAPE 1
#define PPP_F_TOSS 2
+#ifndef SHA_DIGEST_LENGTH
+#define SHA_DIGEST_LENGTH 20
+#endif
+#ifndef SHA256_DIGEST_LENGTH
+#define SHA256_DIGEST_LENGTH 32
+#endif
+
enum {
STATE_INIT = 0,
STATE_STARTING,
@@ -78,6 +85,11 @@ enum {
STATE_FINISHED,
};
+struct hash_t {
+ unsigned int len;
+ uint8_t hash[32];
+};
+
struct buffer_t {
struct list_head entry;
size_t len;
@@ -139,22 +151,28 @@ struct sstp_conn_t {
static struct sstp_serv_t {
struct triton_context_t ctx;
struct triton_md_handler_t hnd;
-
- uint8_t certificate_hash[32];
} serv;
static int conf_timeout = SSTP_NEGOTIOATION_TIMEOUT;
static int conf_hello_interval = SSTP_HELLO_TIMEOUT;
static int conf_verbose = 0;
static int conf_ppp_max_mtu = 1456;
-static int conf_hash_protocol = CERT_HASH_PROTOCOL_SHA256;
-//static int conf_bypass_auth = 0;
static const char *conf_ip_pool;
static const char *conf_ifname;
+
+static int conf_hash_protocol = CERT_HASH_PROTOCOL_SHA1 | CERT_HASH_PROTOCOL_SHA256;
+static struct hash_t conf_hash_sha1 = { .len = 0 };
+static struct hash_t conf_hash_sha256 = { .len = 0 };
+//static int conf_bypass_auth = 0;
+
+#ifdef CRYPTO_OPENSSL
+static X509 *conf_ssl_cert = NULL;
+static EVP_PKEY *conf_ssl_pkey = NULL;
+
+static const char *conf_ssl_ca_file = NULL;
+static const char *conf_ssl_ciphers = "HIGH:!aNULL:!kRSA:!PSK:!SRP:!MD5:!RC4";
static int conf_ssl = 1;
-static char *conf_ssl_ciphers = "HIGH:!aNULL:!kRSA:!PSK:!SRP:!MD5:!RC4";
-static char *conf_ssl_ca_file = NULL;
-static char *conf_ssl_pemfile = NULL;
+#endif
static mempool_t conn_pool;
@@ -1138,6 +1156,21 @@ static int sstp_recv_msg_call_connected(struct sstp_conn_t *conn, struct sstp_ct
if (conn->nonce && memcmp(msg->attr.nonce, conn->nonce, SSTP_NONCE_SIZE) != 0)
return sstp_abort(conn, 0);
+ switch (msg->attr.hash_protocol_bitmask & conf_hash_protocol) {
+ case CERT_HASH_PROTOCOL_SHA1:
+ if (conf_hash_sha1.len == SHA_DIGEST_LENGTH &&
+ memcmp(msg->attr.cert_hash, conf_hash_sha1.hash, SHA_DIGEST_LENGTH) != 0)
+ return sstp_abort(conn, 0);
+ break;
+ case CERT_HASH_PROTOCOL_SHA256:
+ if (conf_hash_sha256.len == SHA256_DIGEST_LENGTH &&
+ memcmp(msg->attr.cert_hash, conf_hash_sha256.hash, SHA256_DIGEST_LENGTH) != 0)
+ return sstp_abort(conn, 0);
+ break;
+ default:
+ return sstp_abort(conn, 0);
+ }
+
conn->sstp_state = STATE_SERVER_CALL_CONNECTED;
_free(conn->nonce);
@@ -1660,9 +1693,9 @@ static void sstp_start(struct sstp_conn_t *conn)
log_sstp_error(conn, "SSL ca file error: %s\n", ERR_error_string(ERR_get_error(), NULL));
goto error;
}
- if (!conf_ssl_pemfile ||
- SSL_CTX_use_certificate_file(conn->ssl_ctx, conf_ssl_pemfile, SSL_FILETYPE_PEM) != 1 ||
- SSL_CTX_use_PrivateKey_file(conn->ssl_ctx, conf_ssl_pemfile, SSL_FILETYPE_PEM) != 1 ||
+ if (!conf_ssl_cert || !conf_ssl_pkey ||
+ SSL_CTX_use_certificate(conn->ssl_ctx, conf_ssl_cert) != 1 ||
+ SSL_CTX_use_PrivateKey(conn->ssl_ctx, conf_ssl_pkey) != 1 ||
SSL_CTX_check_private_key(conn->ssl_ctx) != 1) {
log_sstp_error(conn, "SSL certificate error: %s\n", ERR_error_string(ERR_get_error(), NULL));
goto error;
@@ -1818,21 +1851,148 @@ static void sstp_serv_close(struct triton_context_t *ctx)
triton_context_unregister(ctx);
#ifdef CRYPTO_OPENSSL
+ if (conf_ssl_cert)
+ X509_free(conf_ssl_cert);
+ conf_ssl_cert = NULL;
+
+ if (conf_ssl_pkey)
+ EVP_PKEY_free(conf_ssl_pkey);
+ conf_ssl_pkey = NULL;
+
CRYPTO_thread_cleanup();
#endif
}
+static int strhas(const char *s1, const char *s2, int delim)
+{
+ char *ptr;
+ int n = strlen(s2);
+
+ while ((ptr = strchr(s1, delim))) {
+ if (ptr - s1 == n && memcmp(s1, s2, n) == 0)
+ return 0;
+ s1 = ++ptr;
+ }
+ return strcmp(s1, s2);
+}
+
+static int hex2bin(const char *src, uint8_t *dst, size_t size)
+{
+ char buf[3], *err;
+ int n;
+
+ memset(buf, 0, sizeof(buf));
+ for (n = 0; n < size && src[0] && src[1]; n++) {
+ buf[0] = *src++;
+ buf[1] = *src++;
+ dst[n] = strtoul(buf, &err, 16);
+ if (err == buf || *err)
+ break;
+ }
+ return n;
+}
+
static void load_config(void)
{
char *opt;
+ opt = conf_get_opt("sstp", "cert-hash-proto");
+ if (opt) {
+ conf_hash_protocol = 0;
+ if (strhas(opt, "sha1", ',') == 0)
+ conf_hash_protocol |= CERT_HASH_PROTOCOL_SHA1;
+ if (strhas(opt, "sha256", ',') == 0)
+ conf_hash_protocol |= CERT_HASH_PROTOCOL_SHA256;
+ }
+
+ memset(&conf_hash_sha1, 0, sizeof(conf_hash_sha1));
+ memset(&conf_hash_sha256, 0, sizeof(conf_hash_sha256));
+
+#ifdef CRYPTO_OPENSSL
+ if (conf_ssl_cert) {
+ X509_free(conf_ssl_cert);
+ conf_ssl_cert = NULL;
+ }
+ if (conf_ssl_pkey) {
+ EVP_PKEY_free(conf_ssl_pkey);
+ conf_ssl_pkey = NULL;
+ }
+
opt = conf_get_opt("sstp", "ssl");
if (opt)
conf_ssl = atoi(opt);
- conf_ssl_ciphers = conf_get_opt("sstp", "ssl_ciphers");
- conf_ssl_ca_file = conf_get_opt("sstp", "ssl_ca_file");
- conf_ssl_pemfile = conf_get_opt("sstp", "ssl_pemfile");
+ conf_ssl_ciphers = conf_get_opt("sstp", "ssl-ciphers");
+
+ conf_ssl_ca_file = conf_get_opt("sstp", "ssl-ca-file");
+
+ opt = conf_get_opt("sstp", "ssl-pemfile");
+ if (opt) {
+ BIO *in;
+
+ in = BIO_new(BIO_s_file_internal());
+ if (!in) {
+ SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE, ERR_R_BUF_LIB);
+ log_error("sstp: SSL certificate error: %s\n", ERR_error_string(ERR_get_error(), NULL));
+ goto done;
+ }
+
+ if (BIO_read_filename(in, opt) <= 0) {
+ SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE, ERR_R_SYS_LIB);
+ log_error("sstp: SSL certificate error: %s\n", ERR_error_string(ERR_get_error(), NULL));
+ goto done;
+ }
+
+ conf_ssl_cert = PEM_read_bio_X509(in, NULL, NULL, NULL);
+ if (!conf_ssl_cert) {
+ SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE, ERR_R_PEM_LIB);
+ log_error("sstp: SSL certificate error: %s\n", ERR_error_string(ERR_get_error(), NULL));
+ goto done;
+ }
+
+ if (conf_hash_protocol & CERT_HASH_PROTOCOL_SHA1) {
+ X509_digest(conf_ssl_cert, EVP_sha1(),
+ conf_hash_sha1.hash, &conf_hash_sha1.len);
+ }
+
+ if (conf_hash_protocol & CERT_HASH_PROTOCOL_SHA256) {
+ X509_digest(conf_ssl_cert, EVP_sha256(),
+ conf_hash_sha256.hash, &conf_hash_sha256.len);
+ }
+
+ if (!conf_ssl)
+ goto done;
+
+ if (BIO_read_filename(in, opt) <= 0) {
+ SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE, ERR_R_SYS_LIB);
+ log_error("sstp: SSL certificate error: %s\n", ERR_error_string(ERR_get_error(), NULL));
+ goto done;
+ }
+
+ conf_ssl_pkey = PEM_read_bio_PrivateKey(in, NULL, NULL, NULL);
+ if (!conf_ssl_pkey) {
+ SSLerr(SSL_F_SSL_CTX_USE_PRIVATEKEY_FILE, ERR_R_PEM_LIB);
+ log_error("sstp: SSL certificate error: %s\n", ERR_error_string(ERR_get_error(), NULL));
+ goto done;
+ }
+
+ done:
+ if (in)
+ BIO_free(in);
+ }
+#endif
+
+ opt = conf_get_opt("sstp", "cert-hash-sha1");
+ if (opt) {
+ conf_hash_sha1.len = hex2bin(opt,
+ conf_hash_sha1.hash, sizeof(conf_hash_sha1.hash));
+ }
+
+ opt = conf_get_opt("sstp", "cert-hash-sha256");
+ if (opt) {
+ conf_hash_sha256.len = hex2bin(opt,
+ conf_hash_sha256.hash, sizeof(conf_hash_sha256.hash));
+ }
opt = conf_get_opt("sstp", "timeout");
if (opt && atoi(opt) > 0)
@@ -1865,8 +2025,6 @@ static void load_config(void)
/* Makes compiler happy */
break;
}
-
- //read(urandom_fd, &serv.certificate_hash, sizeof(serv.certificate_hash));
}
static struct sstp_serv_t serv = {
diff --git a/accel-pppd/ctrl/sstp/sstp_prot.h b/accel-pppd/ctrl/sstp/sstp_prot.h
index 0e5785f..f9f78d8 100644
--- a/accel-pppd/ctrl/sstp/sstp_prot.h
+++ b/accel-pppd/ctrl/sstp/sstp_prot.h
@@ -130,8 +130,8 @@ struct sstp_attrib_crypto_binding {
uint8_t reserved[3];
uint8_t hash_protocol_bitmask;
uint8_t nonce[SSTP_NONCE_SIZE];
- uint8_t cert_hash[SSTP_NONCE_SIZE];
- uint8_t compound_mac[SSTP_NONCE_SIZE];
+ uint8_t cert_hash[32];
+ uint8_t compound_mac[32];
} __attribute__((packed));
struct sstp_attrib_crypto_binding_request {
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-17 14:29:01 +0000