/* 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_grpc/ssl.h>

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

#include <openssl_grpc/asn1.h>
#include <openssl_grpc/bio.h>
#include <openssl_grpc/err.h>
#include <openssl_grpc/mem.h>
#include <openssl_grpc/pem.h>
#include <openssl_grpc/stack.h>
#include <openssl_grpc/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.
    sk_X509_NAME_sort(sk);
    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.
    sk_X509_NAME_sort(stack);
    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;
}
