Import LibreSSL 3.2.0

1 files changed, 346 insertions, 0 deletions

diff --git a/tls_conninfo.c b/tls_conninfo.c
new file mode 100644
index 0000000..d44dc84
--- /dev/null
+++ b/tls_conninfo.c
@@ -0,0 +1,346 @@
+/* $OpenBSD: tls_conninfo.c,v 1.21 2019/11/02 13:37:59 jsing Exp $ */
+/*
+ * Copyright (c) 2015 Joel Sing <jsing@openbsd.org>
+ * Copyright (c) 2015 Bob Beck <beck@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdio.h>
+
+#include <openssl/x509.h>
+
+#include <tls.h>
+#include "tls_internal.h"
+
+int ASN1_time_tm_clamp_notafter(struct tm *tm);
+
+int
+tls_hex_string(const unsigned char *in, size_t inlen, char **out,
+    size_t *outlen)
+{
+	static const char hex[] = "0123456789abcdef";
+	size_t i, len;
+	char *p;
+
+	if (outlen != NULL)
+		*outlen = 0;
+
+	if (inlen >= SIZE_MAX)
+		return (-1);
+	if ((*out = reallocarray(NULL, inlen + 1, 2)) == NULL)
+		return (-1);
+
+	p = *out;
+	len = 0;
+	for (i = 0; i < inlen; i++) {
+		p[len++] = hex[(in[i] >> 4) & 0x0f];
+		p[len++] = hex[in[i] & 0x0f];
+	}
+	p[len++] = 0;
+
+	if (outlen != NULL)
+		*outlen = len;
+
+	return (0);
+}
+
+static int
+tls_get_peer_cert_hash(struct tls *ctx, char **hash)
+{
+	*hash = NULL;
+	if (ctx->ssl_peer_cert == NULL)
+		return (0);
+
+	if (tls_cert_hash(ctx->ssl_peer_cert, hash) == -1) {
+		tls_set_errorx(ctx, "unable to compute peer certificate hash - out of memory");
+		*hash = NULL;
+		return -1;
+	}
+	return 0;
+}
+
+static int
+tls_get_peer_cert_issuer(struct tls *ctx,  char **issuer)
+{
+	X509_NAME *name = NULL;
+
+	*issuer = NULL;
+	if (ctx->ssl_peer_cert == NULL)
+		return (-1);
+	if ((name = X509_get_issuer_name(ctx->ssl_peer_cert)) == NULL)
+		return (-1);
+	*issuer = X509_NAME_oneline(name, 0, 0);
+	if (*issuer == NULL)
+		return (-1);
+	return (0);
+}
+
+static int
+tls_get_peer_cert_subject(struct tls *ctx, char **subject)
+{
+	X509_NAME *name = NULL;
+
+	*subject = NULL;
+	if (ctx->ssl_peer_cert == NULL)
+		return (-1);
+	if ((name = X509_get_subject_name(ctx->ssl_peer_cert)) == NULL)
+		return (-1);
+	*subject = X509_NAME_oneline(name, 0, 0);
+	if (*subject == NULL)
+		return (-1);
+	return (0);
+}
+
+static int
+tls_get_peer_cert_times(struct tls *ctx, time_t *notbefore,
+    time_t *notafter)
+{
+	struct tm before_tm, after_tm;
+	ASN1_TIME *before, *after;
+
+	if (ctx->ssl_peer_cert == NULL)
+		return (-1);
+
+	memset(&before_tm, 0, sizeof(before_tm));
+	memset(&after_tm, 0, sizeof(after_tm));
+
+	if ((before = X509_get_notBefore(ctx->ssl_peer_cert)) == NULL)
+		goto err;
+	if ((after = X509_get_notAfter(ctx->ssl_peer_cert)) == NULL)
+		goto err;
+	if (ASN1_time_parse(before->data, before->length, &before_tm, 0) == -1)
+		goto err;
+	if (ASN1_time_parse(after->data, after->length, &after_tm, 0) == -1)
+		goto err;
+	if (!ASN1_time_tm_clamp_notafter(&after_tm))
+		goto err;
+	if ((*notbefore = timegm(&before_tm)) == -1)
+		goto err;
+	if ((*notafter = timegm(&after_tm)) == -1)
+		goto err;
+
+	return (0);
+
+ err:
+	return (-1);
+}
+
+static int
+tls_get_peer_cert_info(struct tls *ctx)
+{
+	if (ctx->ssl_peer_cert == NULL)
+		return (0);
+
+	if (tls_get_peer_cert_hash(ctx, &ctx->conninfo->hash) == -1)
+		goto err;
+	if (tls_get_peer_cert_subject(ctx, &ctx->conninfo->subject) == -1)
+		goto err;
+	if (tls_get_peer_cert_issuer(ctx, &ctx->conninfo->issuer) == -1)
+		goto err;
+	if (tls_get_peer_cert_times(ctx, &ctx->conninfo->notbefore,
+	    &ctx->conninfo->notafter) == -1)
+		goto err;
+
+	return (0);
+
+ err:
+	return (-1);
+}
+
+static int
+tls_conninfo_alpn_proto(struct tls *ctx)
+{
+	const unsigned char *p;
+	unsigned int len;
+
+	free(ctx->conninfo->alpn);
+	ctx->conninfo->alpn = NULL;
+
+	SSL_get0_alpn_selected(ctx->ssl_conn, &p, &len);
+	if (len > 0) {
+		if ((ctx->conninfo->alpn = malloc(len + 1)) == NULL)
+			return (-1);
+		memcpy(ctx->conninfo->alpn, p, len);
+		ctx->conninfo->alpn[len] = '\0';
+	}
+
+	return (0);
+}
+
+static int
+tls_conninfo_cert_pem(struct tls *ctx)
+{
+	int i, rv = -1;
+	BIO *membio = NULL;
+	BUF_MEM *bptr = NULL;
+
+	if (ctx->ssl_peer_cert == NULL)
+		return 0;
+	if ((membio = BIO_new(BIO_s_mem()))== NULL)
+		goto err;
+
+	/*
+	 * We have to write the peer cert out separately, because
+	 * the certificate chain may or may not contain it.
+	 */
+	if (!PEM_write_bio_X509(membio, ctx->ssl_peer_cert))
+		goto err;
+	for (i = 0; i < sk_X509_num(ctx->ssl_peer_chain); i++) {
+		X509 *chaincert = sk_X509_value(ctx->ssl_peer_chain, i);
+		if (chaincert != ctx->ssl_peer_cert &&
+		    !PEM_write_bio_X509(membio, chaincert))
+			goto err;
+	}
+
+	BIO_get_mem_ptr(membio, &bptr);
+	free(ctx->conninfo->peer_cert);
+	ctx->conninfo->peer_cert_len = 0;
+	if ((ctx->conninfo->peer_cert = malloc(bptr->length)) == NULL)
+		goto err;
+	ctx->conninfo->peer_cert_len = bptr->length;
+	memcpy(ctx->conninfo->peer_cert, bptr->data,
+	    ctx->conninfo->peer_cert_len);
+
+	/* BIO_free() will kill BUF_MEM - because we have not set BIO_NOCLOSE */
+	rv = 0;
+ err:
+	BIO_free(membio);
+	return rv;
+}
+
+static int
+tls_conninfo_session(struct tls *ctx)
+{
+	ctx->conninfo->session_resumed = SSL_session_reused(ctx->ssl_conn);
+
+	return 0;
+}
+
+int
+tls_conninfo_populate(struct tls *ctx)
+{
+	const char *tmp;
+
+	tls_conninfo_free(ctx->conninfo);
+
+	if ((ctx->conninfo = calloc(1, sizeof(struct tls_conninfo))) == NULL) {
+		tls_set_errorx(ctx, "out of memory");
+		goto err;
+	}
+
+	if (tls_conninfo_alpn_proto(ctx) == -1)
+		goto err;
+
+	if ((tmp = SSL_get_cipher(ctx->ssl_conn)) == NULL)
+		goto err;
+	if ((ctx->conninfo->cipher = strdup(tmp)) == NULL)
+		goto err;
+	ctx->conninfo->cipher_strength = SSL_get_cipher_bits(ctx->ssl_conn, NULL);
+
+	if (ctx->servername != NULL) {
+		if ((ctx->conninfo->servername =
+		    strdup(ctx->servername)) == NULL)
+			goto err;
+	}
+
+	if ((tmp = SSL_get_version(ctx->ssl_conn)) == NULL)
+		goto err;
+	if ((ctx->conninfo->version = strdup(tmp)) == NULL)
+		goto err;
+
+	if (tls_get_peer_cert_info(ctx) == -1)
+		goto err;
+
+	if (tls_conninfo_cert_pem(ctx) == -1)
+		goto err;
+
+	if (tls_conninfo_session(ctx) == -1)
+		goto err;
+
+	return (0);
+
+ err:
+	tls_conninfo_free(ctx->conninfo);
+	ctx->conninfo = NULL;
+
+	return (-1);
+}
+
+void
+tls_conninfo_free(struct tls_conninfo *conninfo)
+{
+	if (conninfo == NULL)
+		return;
+
+	free(conninfo->alpn);
+	free(conninfo->cipher);
+	free(conninfo->servername);
+	free(conninfo->version);
+
+	free(conninfo->hash);
+	free(conninfo->issuer);
+	free(conninfo->subject);
+
+	free(conninfo->peer_cert);
+
+	free(conninfo);
+}
+
+const char *
+tls_conn_alpn_selected(struct tls *ctx)
+{
+	if (ctx->conninfo == NULL)
+		return (NULL);
+	return (ctx->conninfo->alpn);
+}
+
+const char *
+tls_conn_cipher(struct tls *ctx)
+{
+	if (ctx->conninfo == NULL)
+		return (NULL);
+	return (ctx->conninfo->cipher);
+}
+
+int
+tls_conn_cipher_strength(struct tls *ctx)
+{
+	if (ctx->conninfo == NULL)
+		return (0);
+	return (ctx->conninfo->cipher_strength);
+}
+
+const char *
+tls_conn_servername(struct tls *ctx)
+{
+	if (ctx->conninfo == NULL)
+		return (NULL);
+	return (ctx->conninfo->servername);
+}
+
+int
+tls_conn_session_resumed(struct tls *ctx)
+{
+	if (ctx->conninfo == NULL)
+		return (0);
+	return (ctx->conninfo->session_resumed);
+}
+
+const char *
+tls_conn_version(struct tls *ctx)
+{
+	if (ctx->conninfo == NULL)
+		return (NULL);
+	return (ctx->conninfo->version);
+}