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Diffstat (limited to 'usr.sbin/smtpd/libressl.c')
| -rw-r--r-- | usr.sbin/smtpd/libressl.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/usr.sbin/smtpd/libressl.c b/usr.sbin/smtpd/libressl.c new file mode 100644 index 00000000..57d74389 --- /dev/null +++ b/usr.sbin/smtpd/libressl.c @@ -0,0 +1,213 @@ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ + +/* + * SSL operations needed when running in a privilege separated environment. + * Adapted from openssl's ssl_rsa.c by Pierre-Yves Ritschard . + */ + +#include "includes.h" + +#include <sys/types.h> + +#include <limits.h> +#include <unistd.h> +#include <stdio.h> + +#include <openssl/err.h> +#include <openssl/bio.h> +#include <openssl/objects.h> +#include <openssl/evp.h> +#include <openssl/x509.h> +#include <openssl/pem.h> +#include <openssl/ssl.h> + +#include "log.h" +#include "ssl.h" + +#define SSL_ECDH_CURVE "prime256v1" + +/* + * Read a bio that contains our certificate in "PEM" format, + * possibly followed by a sequence of CA certificates that should be + * sent to the peer in the Certificate message. + */ +static int +ssl_ctx_use_certificate_chain_bio(SSL_CTX *ctx, BIO *in) +{ + int ret = 0; + X509 *x = NULL; + + ERR_clear_error(); /* clear error stack for SSL_CTX_use_certificate() */ + + x = PEM_read_bio_X509_AUX(in, NULL, ctx->default_passwd_callback, + ctx->default_passwd_callback_userdata); + if (x == NULL) { + SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_CHAIN_FILE, ERR_R_PEM_LIB); + goto end; + } + + ret = SSL_CTX_use_certificate(ctx, x); + + if (ERR_peek_error() != 0) + ret = 0; + /* Key/certificate mismatch doesn't imply ret==0 ... */ + if (ret) { + /* + * If we could set up our certificate, now proceed to + * the CA certificates. + */ + X509 *ca; + int r; + unsigned long err; + + if (ctx->extra_certs != NULL) { + sk_X509_pop_free(ctx->extra_certs, X509_free); + ctx->extra_certs = NULL; + } + + while ((ca = PEM_read_bio_X509(in, NULL, + ctx->default_passwd_callback, + ctx->default_passwd_callback_userdata)) != NULL) { + r = SSL_CTX_add_extra_chain_cert(ctx, ca); + if (!r) { + X509_free(ca); + ret = 0; + goto end; + } + /* + * Note that we must not free r if it was successfully + * added to the chain (while we must free the main + * certificate, since its reference count is increased + * by SSL_CTX_use_certificate). + */ + } + + /* When the while loop ends, it's usually just EOF. */ + err = ERR_peek_last_error(); + if (ERR_GET_LIB(err) == ERR_LIB_PEM && + ERR_GET_REASON(err) == PEM_R_NO_START_LINE) + ERR_clear_error(); + else + ret = 0; /* some real error */ + } + +end: + if (x != NULL) + X509_free(x); + return (ret); +} + +int +SSL_CTX_use_certificate_chain_mem(SSL_CTX *ctx, void *buf, int len) +{ + BIO *in; + int ret = 0; + + in = BIO_new_mem_buf(buf, len); + if (in == NULL) { + SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_CHAIN_FILE, ERR_R_BUF_LIB); + goto end; + } + + ret = ssl_ctx_use_certificate_chain_bio(ctx, in); + +end: + BIO_free(in); + return (ret); +} + +#ifndef HAVE_SSL_CTX_SET_ECDH_AUTO +void +SSL_CTX_set_ecdh_auto(SSL_CTX *ctx, int enable) +{ + int nid; + EC_KEY *ecdh; + + if (!enable) + return; + + if ((nid = OBJ_sn2nid(SSL_ECDH_CURVE)) == 0) { + ssl_error("ssl_set_ecdh_auto"); + fatal("ssl_set_ecdh_auto: unknown curve name " + SSL_ECDH_CURVE); + } + + if ((ecdh = EC_KEY_new_by_curve_name(nid)) == NULL) { + ssl_error("ssl_set_ecdh_auto"); + fatal("ssl_set_ecdh_auto: unable to create curve " + SSL_ECDH_CURVE); + } + + SSL_CTX_set_tmp_ecdh(ctx, ecdh); + SSL_CTX_set_options(ctx, SSL_OP_SINGLE_ECDH_USE); + EC_KEY_free(ecdh); +} +#endif + +#ifndef HAVE_SSL_CTX_SET_DH_AUTO +void +SSL_CTX_set_dh_auto(SSL_CTX *ctx, int enable) +{ + if (!enable) + return; + + /* stub until OpenSSL catches up with this ... */ + log_warnx("OpenSSL does not support SSL_CTX_set_dh_auto (yet ?)"); + return; +} +#endif |