ssl/ssl_file.cc - boringssl - Git at Google

 /* 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.]
  */
 /* ====================================================================
  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  *
  * 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 above 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 acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  *
  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  *    endorse or promote products derived from this software without
  *    prior written permission. For written permission, please contact
  *    openssl-core@openssl.org.
  *
  * 5. Products derived from this software may not be called "OpenSSL"
  *    nor may "OpenSSL" appear in their names without prior written
  *    permission of the OpenSSL Project.
  *
  * 6. Redistributions of any form whatsoever must retain the following
  *    acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  *
  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  * EXPRESSED 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 OpenSSL PROJECT OR
  * ITS 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.
  * ====================================================================
  *
  * This product includes cryptographic software written by Eric Young
  * (eay@cryptsoft.com).  This product includes software written by Tim
  * Hudson (tjh@cryptsoft.com).
  *
  */

 #include <openssl/ssl.h>

 #include <errno.h>
 #include <string.h>

 #include <openssl/asn1.h>
 #include <openssl/bio.h>
 #include <openssl/err.h>
 #include <openssl/mem.h>
 #include <openssl/pem.h>
 #include <openssl/stack.h>
 #include <openssl/x509.h>

 #include "internal.h"


 static int xname_cmp(const X509_NAME **a, const X509_NAME **b) {
   return X509_NAME_cmp(*a, *b);
 }

 // TODO(davidben): Is there any reason this doesn't call
 // |SSL_add_file_cert_subjects_to_stack|?
 STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file) {
   BIO *in;
   X509 *x = NULL;
   X509_NAME *xn = NULL;
   STACK_OF(X509_NAME) *ret = NULL, *sk;

   sk = sk_X509_NAME_new(xname_cmp);
   in = BIO_new(BIO_s_file());

   if (sk == NULL || in == NULL) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
     goto err;
   }

   if (!BIO_read_filename(in, file)) {
     goto err;
   }

   for (;;) {
     if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL) {
       break;
     }
     if (ret == NULL) {
       ret = sk_X509_NAME_new_null();
       if (ret == NULL) {
         OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
         goto err;
       }
     }
     xn = X509_get_subject_name(x);
     if (xn == NULL) {
       goto err;
     }

     // Check for duplicates.
     if (sk_X509_NAME_find(sk, NULL, xn)) {
       continue;
     }

     xn = X509_NAME_dup(xn);
     if (xn == NULL ||
         !sk_X509_NAME_push(sk /* non-owning */, xn) ||
         !sk_X509_NAME_push(ret /* owning */, xn)) {
       X509_NAME_free(xn);
       goto err;
     }
   }

   if (0) {
   err:
     sk_X509_NAME_pop_free(ret, X509_NAME_free);
     ret = NULL;
   }

   sk_X509_NAME_free(sk);
   BIO_free(in);
   X509_free(x);
   if (ret != NULL) {
     ERR_clear_error();
   }
   return ret;
 }

 int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
                                         const char *file) {
   BIO *in;
   X509 *x = NULL;
   X509_NAME *xn = NULL;
   int ret = 0;
   int (*oldcmp)(const X509_NAME **a, const X509_NAME **b);

   oldcmp = sk_X509_NAME_set_cmp_func(stack, xname_cmp);
   in = BIO_new(BIO_s_file());

   if (in == NULL) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
     goto err;
   }

   if (!BIO_read_filename(in, file)) {
     goto err;
   }

   for (;;) {
     if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL) {
       break;
     }
     xn = X509_get_subject_name(x);
     if (xn == NULL) {
       goto err;
     }

     // Check for duplicates.
     if (sk_X509_NAME_find(stack, NULL, xn)) {
       continue;
     }

     xn = X509_NAME_dup(xn);
     if (xn == NULL ||
         !sk_X509_NAME_push(stack, xn)) {
       X509_NAME_free(xn);
       goto err;
     }
   }

   ERR_clear_error();
   ret = 1;

 err:
   BIO_free(in);
   X509_free(x);

   (void) sk_X509_NAME_set_cmp_func(stack, oldcmp);

   return ret;
 }

 int SSL_use_certificate_file(SSL *ssl, const char *file, int type) {
   int reason_code;
   BIO *in;
   int ret = 0;
   X509 *x = NULL;

   in = BIO_new(BIO_s_file());
   if (in == NULL) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_BUF_LIB);
     goto end;
   }

   if (BIO_read_filename(in, file) <= 0) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_SYS_LIB);
     goto end;
   }

   if (type == SSL_FILETYPE_ASN1) {
     reason_code = ERR_R_ASN1_LIB;
     x = d2i_X509_bio(in, NULL);
   } else if (type == SSL_FILETYPE_PEM) {
     reason_code = ERR_R_PEM_LIB;
     x = PEM_read_bio_X509(in, NULL, ssl->ctx->default_passwd_callback,
                           ssl->ctx->default_passwd_callback_userdata);
   } else {
     OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SSL_FILETYPE);
     goto end;
   }

   if (x == NULL) {
     OPENSSL_PUT_ERROR(SSL, reason_code);
     goto end;
   }

   ret = SSL_use_certificate(ssl, x);

 end:
   X509_free(x);
   BIO_free(in);

   return ret;
 }

 int SSL_use_RSAPrivateKey_file(SSL *ssl, const char *file, int type) {
   int reason_code, ret = 0;
   BIO *in;
   RSA *rsa = NULL;

   in = BIO_new(BIO_s_file());
   if (in == NULL) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_BUF_LIB);
     goto end;
   }

   if (BIO_read_filename(in, file) <= 0) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_SYS_LIB);
     goto end;
   }

   if (type == SSL_FILETYPE_ASN1) {
     reason_code = ERR_R_ASN1_LIB;
     rsa = d2i_RSAPrivateKey_bio(in, NULL);
   } else if (type == SSL_FILETYPE_PEM) {
     reason_code = ERR_R_PEM_LIB;
     rsa =
         PEM_read_bio_RSAPrivateKey(in, NULL, ssl->ctx->default_passwd_callback,
                                    ssl->ctx->default_passwd_callback_userdata);
   } else {
     OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SSL_FILETYPE);
     goto end;
   }

   if (rsa == NULL) {
     OPENSSL_PUT_ERROR(SSL, reason_code);
     goto end;
   }
   ret = SSL_use_RSAPrivateKey(ssl, rsa);
   RSA_free(rsa);

 end:
   BIO_free(in);
   return ret;
 }

 int SSL_use_PrivateKey_file(SSL *ssl, const char *file, int type) {
   int reason_code, ret = 0;
   BIO *in;
   EVP_PKEY *pkey = NULL;

   in = BIO_new(BIO_s_file());
   if (in == NULL) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_BUF_LIB);
     goto end;
   }

   if (BIO_read_filename(in, file) <= 0) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_SYS_LIB);
     goto end;
   }

   if (type == SSL_FILETYPE_PEM) {
     reason_code = ERR_R_PEM_LIB;
     pkey = PEM_read_bio_PrivateKey(in, NULL, ssl->ctx->default_passwd_callback,
                                    ssl->ctx->default_passwd_callback_userdata);
   } else if (type == SSL_FILETYPE_ASN1) {
     reason_code = ERR_R_ASN1_LIB;
     pkey = d2i_PrivateKey_bio(in, NULL);
   } else {
     OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SSL_FILETYPE);
     goto end;
   }

   if (pkey == NULL) {
     OPENSSL_PUT_ERROR(SSL, reason_code);
     goto end;
   }
   ret = SSL_use_PrivateKey(ssl, pkey);
   EVP_PKEY_free(pkey);

 end:
   BIO_free(in);
   return ret;
 }

 int SSL_CTX_use_certificate_file(SSL_CTX *ctx, const char *file, int type) {
   int reason_code;
   BIO *in;
   int ret = 0;
   X509 *x = NULL;

   in = BIO_new(BIO_s_file());
   if (in == NULL) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_BUF_LIB);
     goto end;
   }

   if (BIO_read_filename(in, file) <= 0) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_SYS_LIB);
     goto end;
   }

   if (type == SSL_FILETYPE_ASN1) {
     reason_code = ERR_R_ASN1_LIB;
     x = d2i_X509_bio(in, NULL);
   } else if (type == SSL_FILETYPE_PEM) {
     reason_code = ERR_R_PEM_LIB;
     x = PEM_read_bio_X509(in, NULL, ctx->default_passwd_callback,
                           ctx->default_passwd_callback_userdata);
   } else {
     OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SSL_FILETYPE);
     goto end;
   }

   if (x == NULL) {
     OPENSSL_PUT_ERROR(SSL, reason_code);
     goto end;
   }

   ret = SSL_CTX_use_certificate(ctx, x);

 end:
   X509_free(x);
   BIO_free(in);
   return ret;
 }

 int SSL_CTX_use_RSAPrivateKey_file(SSL_CTX *ctx, const char *file, int type) {
   int reason_code, ret = 0;
   BIO *in;
   RSA *rsa = NULL;

   in = BIO_new(BIO_s_file());
   if (in == NULL) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_BUF_LIB);
     goto end;
   }

   if (BIO_read_filename(in, file) <= 0) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_SYS_LIB);
     goto end;
   }

   if (type == SSL_FILETYPE_ASN1) {
     reason_code = ERR_R_ASN1_LIB;
     rsa = d2i_RSAPrivateKey_bio(in, NULL);
   } else if (type == SSL_FILETYPE_PEM) {
     reason_code = ERR_R_PEM_LIB;
     rsa = PEM_read_bio_RSAPrivateKey(in, NULL, ctx->default_passwd_callback,
                                      ctx->default_passwd_callback_userdata);
   } else {
     OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SSL_FILETYPE);
     goto end;
   }

   if (rsa == NULL) {
     OPENSSL_PUT_ERROR(SSL, reason_code);
     goto end;
   }
   ret = SSL_CTX_use_RSAPrivateKey(ctx, rsa);
   RSA_free(rsa);

 end:
   BIO_free(in);
   return ret;
 }

 int SSL_CTX_use_PrivateKey_file(SSL_CTX *ctx, const char *file, int type) {
   int reason_code, ret = 0;
   BIO *in;
   EVP_PKEY *pkey = NULL;

   in = BIO_new(BIO_s_file());
   if (in == NULL) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_BUF_LIB);
     goto end;
   }

   if (BIO_read_filename(in, file) <= 0) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_SYS_LIB);
     goto end;
   }

   if (type == SSL_FILETYPE_PEM) {
     reason_code = ERR_R_PEM_LIB;
     pkey = PEM_read_bio_PrivateKey(in, NULL, ctx->default_passwd_callback,
                                    ctx->default_passwd_callback_userdata);
   } else if (type == SSL_FILETYPE_ASN1) {
     reason_code = ERR_R_ASN1_LIB;
     pkey = d2i_PrivateKey_bio(in, NULL);
   } else {
     OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SSL_FILETYPE);
     goto end;
   }

   if (pkey == NULL) {
     OPENSSL_PUT_ERROR(SSL, reason_code);
     goto end;
   }
   ret = SSL_CTX_use_PrivateKey(ctx, pkey);
   EVP_PKEY_free(pkey);

 end:
   BIO_free(in);
   return ret;
 }

 // Read a file 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.
 int SSL_CTX_use_certificate_chain_file(SSL_CTX *ctx, const char *file) {
   BIO *in;
   int ret = 0;
   X509 *x = NULL;

   ERR_clear_error();  // clear error stack for SSL_CTX_use_certificate()

   in = BIO_new(BIO_s_file());
   if (in == NULL) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_BUF_LIB);
     goto end;
   }

   if (BIO_read_filename(in, file) <= 0) {
     OPENSSL_PUT_ERROR(SSL, ERR_R_SYS_LIB);
     goto end;
   }

   x = PEM_read_bio_X509_AUX(in, NULL, ctx->default_passwd_callback,
                             ctx->default_passwd_callback_userdata);
   if (x == NULL) {
     OPENSSL_PUT_ERROR(SSL, 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;
     uint32_t err;

     SSL_CTX_clear_chain_certs(ctx);

     while ((ca = PEM_read_bio_X509(in, NULL, ctx->default_passwd_callback,
                                    ctx->default_passwd_callback_userdata)) !=
            NULL) {
       r = SSL_CTX_add0_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:
   X509_free(x);
   BIO_free(in);
   return ret;
 }

 void SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx, pem_password_cb *cb) {
   ctx->default_passwd_callback = cb;
 }

 pem_password_cb *SSL_CTX_get_default_passwd_cb(const SSL_CTX *ctx) {
   return ctx->default_passwd_callback;
 }

 void SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX *ctx, void *data) {
   ctx->default_passwd_callback_userdata = data;
 }

 void *SSL_CTX_get_default_passwd_cb_userdata(const SSL_CTX *ctx) {
   return ctx->default_passwd_callback_userdata;
 }
	/* 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.]
	*/
	/* ====================================================================
	* Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
	*
	* 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 above 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 acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
	*
	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	* endorse or promote products derived from this software without
	* prior written permission. For written permission, please contact
	* openssl-core@openssl.org.
	*
	* 5. Products derived from this software may not be called "OpenSSL"
	* nor may "OpenSSL" appear in their names without prior written
	* permission of the OpenSSL Project.
	*
	* 6. Redistributions of any form whatsoever must retain the following
	* acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
	*
	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	* EXPRESSED 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 OpenSSL PROJECT OR
	* ITS 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.
	* ====================================================================
	*
	* This product includes cryptographic software written by Eric Young
	* (eay@cryptsoft.com). This product includes software written by Tim
	* Hudson (tjh@cryptsoft.com).
	*
	*/

	#include <openssl/ssl.h>

	#include <errno.h>
	#include <string.h>

	#include <openssl/asn1.h>
	#include <openssl/bio.h>
	#include <openssl/err.h>
	#include <openssl/mem.h>
	#include <openssl/pem.h>
	#include <openssl/stack.h>
	#include <openssl/x509.h>

	#include "internal.h"


	static int xname_cmp(const X509_NAME a, const X509_NAME b) {
	return X509_NAME_cmp(a, b);
	}

	// TODO(davidben): Is there any reason this doesn't call
	// \|SSL_add_file_cert_subjects_to_stack\|?
	STACK_OF(X509_NAME) SSL_load_client_CA_file(const char file) {
	BIO *in;
	X509 *x = NULL;
	X509_NAME *xn = NULL;
	STACK_OF(X509_NAME) ret = NULL, sk;

	sk = sk_X509_NAME_new(xname_cmp);
	in = BIO_new(BIO_s_file());

	if (sk == NULL \|\| in == NULL) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
	goto err;
	}

	if (!BIO_read_filename(in, file)) {
	goto err;
	}

	for (;;) {
	if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL) {
	break;
	}
	if (ret == NULL) {
	ret = sk_X509_NAME_new_null();
	if (ret == NULL) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
	goto err;
	}
	}
	xn = X509_get_subject_name(x);
	if (xn == NULL) {
	goto err;
	}

	// Check for duplicates.
	if (sk_X509_NAME_find(sk, NULL, xn)) {
	continue;
	}

	xn = X509_NAME_dup(xn);
	if (xn == NULL \|\|
	!sk_X509_NAME_push(sk /* non-owning */, xn) \|\|
	!sk_X509_NAME_push(ret /* owning */, xn)) {
	X509_NAME_free(xn);
	goto err;
	}
	}

	if (0) {
	err:
	sk_X509_NAME_pop_free(ret, X509_NAME_free);
	ret = NULL;
	}

	sk_X509_NAME_free(sk);
	BIO_free(in);
	X509_free(x);
	if (ret != NULL) {
	ERR_clear_error();
	}
	return ret;
	}

	int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
	const char *file) {
	BIO *in;
	X509 *x = NULL;
	X509_NAME *xn = NULL;
	int ret = 0;
	int (oldcmp)(const X509_NAME a, const X509_NAME *b);

	oldcmp = sk_X509_NAME_set_cmp_func(stack, xname_cmp);
	in = BIO_new(BIO_s_file());

	if (in == NULL) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
	goto err;
	}

	if (!BIO_read_filename(in, file)) {
	goto err;
	}

	for (;;) {
	if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL) {
	break;
	}
	xn = X509_get_subject_name(x);
	if (xn == NULL) {
	goto err;
	}

	// Check for duplicates.
	if (sk_X509_NAME_find(stack, NULL, xn)) {
	continue;
	}

	xn = X509_NAME_dup(xn);
	if (xn == NULL \|\|
	!sk_X509_NAME_push(stack, xn)) {
	X509_NAME_free(xn);
	goto err;
	}
	}

	ERR_clear_error();
	ret = 1;

	err:
	BIO_free(in);
	X509_free(x);

	(void) sk_X509_NAME_set_cmp_func(stack, oldcmp);

	return ret;
	}

	int SSL_use_certificate_file(SSL ssl, const char file, int type) {
	int reason_code;
	BIO *in;
	int ret = 0;
	X509 *x = NULL;

	in = BIO_new(BIO_s_file());
	if (in == NULL) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_BUF_LIB);
	goto end;
	}

	if (BIO_read_filename(in, file) <= 0) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_SYS_LIB);
	goto end;
	}

	if (type == SSL_FILETYPE_ASN1) {
	reason_code = ERR_R_ASN1_LIB;
	x = d2i_X509_bio(in, NULL);
	} else if (type == SSL_FILETYPE_PEM) {
	reason_code = ERR_R_PEM_LIB;
	x = PEM_read_bio_X509(in, NULL, ssl->ctx->default_passwd_callback,
	ssl->ctx->default_passwd_callback_userdata);
	} else {
	OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SSL_FILETYPE);
	goto end;
	}

	if (x == NULL) {
	OPENSSL_PUT_ERROR(SSL, reason_code);
	goto end;
	}

	ret = SSL_use_certificate(ssl, x);

	end:
	X509_free(x);
	BIO_free(in);

	return ret;
	}

	int SSL_use_RSAPrivateKey_file(SSL ssl, const char file, int type) {
	int reason_code, ret = 0;
	BIO *in;
	RSA *rsa = NULL;

	in = BIO_new(BIO_s_file());
	if (in == NULL) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_BUF_LIB);
	goto end;
	}

	if (BIO_read_filename(in, file) <= 0) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_SYS_LIB);
	goto end;
	}

	if (type == SSL_FILETYPE_ASN1) {
	reason_code = ERR_R_ASN1_LIB;
	rsa = d2i_RSAPrivateKey_bio(in, NULL);
	} else if (type == SSL_FILETYPE_PEM) {
	reason_code = ERR_R_PEM_LIB;
	rsa =
	PEM_read_bio_RSAPrivateKey(in, NULL, ssl->ctx->default_passwd_callback,
	ssl->ctx->default_passwd_callback_userdata);
	} else {
	OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SSL_FILETYPE);
	goto end;
	}

	if (rsa == NULL) {
	OPENSSL_PUT_ERROR(SSL, reason_code);
	goto end;
	}
	ret = SSL_use_RSAPrivateKey(ssl, rsa);
	RSA_free(rsa);

	end:
	BIO_free(in);
	return ret;
	}

	int SSL_use_PrivateKey_file(SSL ssl, const char file, int type) {
	int reason_code, ret = 0;
	BIO *in;
	EVP_PKEY *pkey = NULL;

	in = BIO_new(BIO_s_file());
	if (in == NULL) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_BUF_LIB);
	goto end;
	}

	if (BIO_read_filename(in, file) <= 0) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_SYS_LIB);
	goto end;
	}

	if (type == SSL_FILETYPE_PEM) {
	reason_code = ERR_R_PEM_LIB;
	pkey = PEM_read_bio_PrivateKey(in, NULL, ssl->ctx->default_passwd_callback,
	ssl->ctx->default_passwd_callback_userdata);
	} else if (type == SSL_FILETYPE_ASN1) {
	reason_code = ERR_R_ASN1_LIB;
	pkey = d2i_PrivateKey_bio(in, NULL);
	} else {
	OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SSL_FILETYPE);
	goto end;
	}

	if (pkey == NULL) {
	OPENSSL_PUT_ERROR(SSL, reason_code);
	goto end;
	}
	ret = SSL_use_PrivateKey(ssl, pkey);
	EVP_PKEY_free(pkey);

	end:
	BIO_free(in);
	return ret;
	}

	int SSL_CTX_use_certificate_file(SSL_CTX ctx, const char file, int type) {
	int reason_code;
	BIO *in;
	int ret = 0;
	X509 *x = NULL;

	in = BIO_new(BIO_s_file());
	if (in == NULL) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_BUF_LIB);
	goto end;
	}

	if (BIO_read_filename(in, file) <= 0) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_SYS_LIB);
	goto end;
	}

	if (type == SSL_FILETYPE_ASN1) {
	reason_code = ERR_R_ASN1_LIB;
	x = d2i_X509_bio(in, NULL);
	} else if (type == SSL_FILETYPE_PEM) {
	reason_code = ERR_R_PEM_LIB;
	x = PEM_read_bio_X509(in, NULL, ctx->default_passwd_callback,
	ctx->default_passwd_callback_userdata);
	} else {
	OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SSL_FILETYPE);
	goto end;
	}

	if (x == NULL) {
	OPENSSL_PUT_ERROR(SSL, reason_code);
	goto end;
	}

	ret = SSL_CTX_use_certificate(ctx, x);

	end:
	X509_free(x);
	BIO_free(in);
	return ret;
	}

	int SSL_CTX_use_RSAPrivateKey_file(SSL_CTX ctx, const char file, int type) {
	int reason_code, ret = 0;
	BIO *in;
	RSA *rsa = NULL;

	in = BIO_new(BIO_s_file());
	if (in == NULL) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_BUF_LIB);
	goto end;
	}

	if (BIO_read_filename(in, file) <= 0) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_SYS_LIB);
	goto end;
	}

	if (type == SSL_FILETYPE_ASN1) {
	reason_code = ERR_R_ASN1_LIB;
	rsa = d2i_RSAPrivateKey_bio(in, NULL);
	} else if (type == SSL_FILETYPE_PEM) {
	reason_code = ERR_R_PEM_LIB;
	rsa = PEM_read_bio_RSAPrivateKey(in, NULL, ctx->default_passwd_callback,
	ctx->default_passwd_callback_userdata);
	} else {
	OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SSL_FILETYPE);
	goto end;
	}

	if (rsa == NULL) {
	OPENSSL_PUT_ERROR(SSL, reason_code);
	goto end;
	}
	ret = SSL_CTX_use_RSAPrivateKey(ctx, rsa);
	RSA_free(rsa);

	end:
	BIO_free(in);
	return ret;
	}

	int SSL_CTX_use_PrivateKey_file(SSL_CTX ctx, const char file, int type) {
	int reason_code, ret = 0;
	BIO *in;
	EVP_PKEY *pkey = NULL;

	in = BIO_new(BIO_s_file());
	if (in == NULL) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_BUF_LIB);
	goto end;
	}

	if (BIO_read_filename(in, file) <= 0) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_SYS_LIB);
	goto end;
	}

	if (type == SSL_FILETYPE_PEM) {
	reason_code = ERR_R_PEM_LIB;
	pkey = PEM_read_bio_PrivateKey(in, NULL, ctx->default_passwd_callback,
	ctx->default_passwd_callback_userdata);
	} else if (type == SSL_FILETYPE_ASN1) {
	reason_code = ERR_R_ASN1_LIB;
	pkey = d2i_PrivateKey_bio(in, NULL);
	} else {
	OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SSL_FILETYPE);
	goto end;
	}

	if (pkey == NULL) {
	OPENSSL_PUT_ERROR(SSL, reason_code);
	goto end;
	}
	ret = SSL_CTX_use_PrivateKey(ctx, pkey);
	EVP_PKEY_free(pkey);

	end:
	BIO_free(in);
	return ret;
	}

	// Read a file 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.
	int SSL_CTX_use_certificate_chain_file(SSL_CTX ctx, const char file) {
	BIO *in;
	int ret = 0;
	X509 *x = NULL;

	ERR_clear_error(); // clear error stack for SSL_CTX_use_certificate()

	in = BIO_new(BIO_s_file());
	if (in == NULL) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_BUF_LIB);
	goto end;
	}

	if (BIO_read_filename(in, file) <= 0) {
	OPENSSL_PUT_ERROR(SSL, ERR_R_SYS_LIB);
	goto end;
	}

	x = PEM_read_bio_X509_AUX(in, NULL, ctx->default_passwd_callback,
	ctx->default_passwd_callback_userdata);
	if (x == NULL) {
	OPENSSL_PUT_ERROR(SSL, 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;
	uint32_t err;

	SSL_CTX_clear_chain_certs(ctx);

	while ((ca = PEM_read_bio_X509(in, NULL, ctx->default_passwd_callback,
	ctx->default_passwd_callback_userdata)) !=
	NULL) {
	r = SSL_CTX_add0_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:
	X509_free(x);
	BIO_free(in);
	return ret;
	}

	void SSL_CTX_set_default_passwd_cb(SSL_CTX ctx, pem_password_cb cb) {
	ctx->default_passwd_callback = cb;
	}

	pem_password_cb SSL_CTX_get_default_passwd_cb(const SSL_CTX ctx) {
	return ctx->default_passwd_callback;
	}

	void SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX ctx, void data) {
	ctx->default_passwd_callback_userdata = data;
	}

	void SSL_CTX_get_default_passwd_cb_userdata(const SSL_CTX ctx) {
	return ctx->default_passwd_callback_userdata;
	}