Remove support for OpenSSL versions older than 0.9.8.

OpenSSL officially only supports 1.0.1 and newer. Some OS distributions
still provide patches for 0.9.8, but anything older than that is not
interesting anymore. Let's simplify things by removing compatibility code.

Andreas Karlsson, with small changes by me.

7 files changed, 20 insertions, 206 deletions

diff --git a/contrib/pgcrypto/openssl.c b/contrib/pgcrypto/openssl.c
index 976af705915..ffab5d2bb0e 100644
--- a/contrib/pgcrypto/openssl.c
+++ b/contrib/pgcrypto/openssl.c
@@ -37,6 +37,7 @@
 #include <openssl/blowfish.h>
 #include <openssl/cast.h>
 #include <openssl/des.h>
+#include <openssl/aes.h>
 #include <openssl/rand.h>
 #include <openssl/err.h>
 
@@ -47,155 +48,6 @@
 #define MAX_IV		(128/8)
 
 /*
- * Compatibility with OpenSSL 0.9.6
- *
- * It needs AES and newer DES and digest API.
- */
-#if OPENSSL_VERSION_NUMBER >= 0x00907000L
-
-/*
- * Nothing needed for OpenSSL 0.9.7+
- */
-
-#include <openssl/aes.h>
-#else							/* old OPENSSL */
-
-/*
- * Emulate OpenSSL AES.
- */
-
-#include "rijndael.c"
-
-#define AES_ENCRYPT 1
-#define AES_DECRYPT 0
-#define AES_KEY		rijndael_ctx
-
-static int
-AES_set_encrypt_key(const uint8 *key, int kbits, AES_KEY *ctx)
-{
-	aes_set_key(ctx, key, kbits, 1);
-	return 0;
-}
-
-static int
-AES_set_decrypt_key(const uint8 *key, int kbits, AES_KEY *ctx)
-{
-	aes_set_key(ctx, key, kbits, 0);
-	return 0;
-}
-
-static void
-AES_ecb_encrypt(const uint8 *src, uint8 *dst, AES_KEY *ctx, int enc)
-{
-	memcpy(dst, src, 16);
-	if (enc)
-		aes_ecb_encrypt(ctx, dst, 16);
-	else
-		aes_ecb_decrypt(ctx, dst, 16);
-}
-
-static void
-AES_cbc_encrypt(const uint8 *src, uint8 *dst, int len, AES_KEY *ctx, uint8 *iv, int enc)
-{
-	memcpy(dst, src, len);
-	if (enc)
-	{
-		aes_cbc_encrypt(ctx, iv, dst, len);
-		memcpy(iv, dst + len - 16, 16);
-	}
-	else
-	{
-		aes_cbc_decrypt(ctx, iv, dst, len);
-		memcpy(iv, src + len - 16, 16);
-	}
-}
-
-/*
- * Emulate DES_* API
- */
-
-#define DES_key_schedule des_key_schedule
-#define DES_cblock des_cblock
-#define DES_set_key(k, ks) \
-		des_set_key((k), *(ks))
-#define DES_ecb_encrypt(i, o, k, e) \
-		des_ecb_encrypt((i), (o), *(k), (e))
-#define DES_ncbc_encrypt(i, o, l, k, iv, e) \
-		des_ncbc_encrypt((i), (o), (l), *(k), (iv), (e))
-#define DES_ecb3_encrypt(i, o, k1, k2, k3, e) \
-		des_ecb3_encrypt((des_cblock *)(i), (des_cblock *)(o), \
-				*(k1), *(k2), *(k3), (e))
-#define DES_ede3_cbc_encrypt(i, o, l, k1, k2, k3, iv, e) \
-		des_ede3_cbc_encrypt((i), (o), \
-				(l), *(k1), *(k2), *(k3), (iv), (e))
-
-/*
- * Emulate newer digest API.
- */
-
-static void
-EVP_MD_CTX_init(EVP_MD_CTX *ctx)
-{
-	memset(ctx, 0, sizeof(*ctx));
-}
-
-static int
-EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
-{
-	px_memset(ctx, 0, sizeof(*ctx));
-	return 1;
-}
-
-static int
-EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *md, void *engine)
-{
-	EVP_DigestInit(ctx, md);
-	return 1;
-}
-
-static int
-EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *res, unsigned int *len)
-{
-	EVP_DigestFinal(ctx, res, len);
-	return 1;
-}
-#endif   /* old OpenSSL */
-
-/*
- * Provide SHA2 for older OpenSSL < 0.9.8
- */
-#if OPENSSL_VERSION_NUMBER < 0x00908000L
-
-#include "sha2.c"
-#include "internal-sha2.c"
-
-typedef void (*init_f) (PX_MD *md);
-
-static int
-compat_find_digest(const char *name, PX_MD **res)
-{
-	init_f		init = NULL;
-
-	if (pg_strcasecmp(name, "sha224") == 0)
-		init = init_sha224;
-	else if (pg_strcasecmp(name, "sha256") == 0)
-		init = init_sha256;
-	else if (pg_strcasecmp(name, "sha384") == 0)
-		init = init_sha384;
-	else if (pg_strcasecmp(name, "sha512") == 0)
-		init = init_sha512;
-	else
-		return PXE_NO_HASH;
-
-	*res = px_alloc(sizeof(PX_MD));
-	init(*res);
-	return 0;
-}
-#else
-#define compat_find_digest(name, res)  (PXE_NO_HASH)
-#endif
-
-/*
  * Hashes
  */
 
@@ -275,7 +127,7 @@ px_find_digest(const char *name, PX_MD **res)
 
 	md = EVP_get_digestbyname(name);
 	if (md == NULL)
-		return compat_find_digest(name, res);
+		return PXE_NO_HASH;
 
 	digest = px_alloc(sizeof(*digest));
 	digest->algo = md;
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index a9968756e65..14a6d57aeaf 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -252,10 +252,17 @@ su - postgres
 
     <listitem>
      <para>
-      You need <application>Kerberos</>, <productname>OpenSSL</>,
-      <productname>OpenLDAP</>, and/or
-      <application>PAM</>, if you want to support authentication or
-      encryption using those services.
+      You need <productname>OpenSSL</>, if you want to support
+      encrypted client connections. The minimum required version is
+      0.9.8.
+     </para>
+    </listitem>
+
+    <listitem>
+     <para>
+      You need <application>Kerberos</>, <productname>OpenLDAP</>,
+      and/or <application>PAM</>, if you want to support authentication
+      using those services.
      </para>
     </listitem>
 
@@ -2827,30 +2834,6 @@ MANPATH=/usr/lib/scohelp/%L/man:/usr/dt/man:/usr/man:/usr/share/man:scohelp:/usr
    </sect3>
 
    <sect3>
-    <title>Problems with OpenSSL</title>
-
-    <para>
-     When you build PostgreSQL with OpenSSL support you might get
-     compilation errors in the following files:
-     <itemizedlist>
-      <listitem><para><filename>src/backend/libpq/crypt.c</filename></para></listitem>
-      <listitem><para><filename>src/backend/libpq/password.c</filename></para></listitem>
-      <listitem><para><filename>src/interfaces/libpq/fe-auth.c</filename></para></listitem>
-      <listitem><para><filename>src/interfaces/libpq/fe-connect.c</filename></para></listitem>
-     </itemizedlist>
-
-     This is because of a namespace conflict between the standard
-     <filename>/usr/include/crypt.h</filename> header and the header
-     files provided by OpenSSL.
-    </para>
-
-    <para>
-     Upgrading your OpenSSL installation to version 0.9.6a fixes this
-     problem.  Solaris 9 and above has a newer version of OpenSSL.
-    </para>
-   </sect3>
-
-   <sect3>
     <title>configure Complains About a Failed Test Program</title>
 
     <para>
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 2f9350b10e1..4e34f00e44d 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -1238,8 +1238,7 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <listitem>
        <para>
         If set to 1 (default), data sent over SSL connections will be
-        compressed (this requires <productname>OpenSSL</> version
-        0.9.8 or later).
+        compressed.
         If set to 0, compression will be disabled (this requires
         <productname>OpenSSL</> 1.0.0 or later).
         This parameter is ignored if a connection without SSL is made,
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index c4cefde4f78..bf514aacf35 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -1184,12 +1184,12 @@ gen_random_uuid() returns uuid
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
-       <entry>yes (Note 1)</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
-       <entry>yes (Note 2)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
@@ -1199,7 +1199,7 @@ gen_random_uuid() returns uuid
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
-       <entry>yes (Note 3)</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
@@ -1232,23 +1232,11 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      SHA2 algorithms were added to OpenSSL in version 0.9.8.  For
-      older versions, <filename>pgcrypto</> will use built-in code.
-     </para>
-    </listitem>
-    <listitem>
-     <para>
       Any digest algorithm OpenSSL supports is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
      </para>
     </listitem>
-    <listitem>
-     <para>
-      AES is included in OpenSSL since version 0.9.7.  For
-      older versions, <filename>pgcrypto</> will use built-in code.
-     </para>
-    </listitem>
    </orderedlist>
   </sect3>
 
diff --git a/src/backend/libpq/be-secure-openssl.c b/src/backend/libpq/be-secure-openssl.c
index f6adb155c6e..e5f434ca17a 100644
--- a/src/backend/libpq/be-secure-openssl.c
+++ b/src/backend/libpq/be-secure-openssl.c
@@ -53,10 +53,8 @@
 
 #include <openssl/ssl.h>
 #include <openssl/dh.h>
-#if SSLEAY_VERSION_NUMBER >= 0x0907000L
 #include <openssl/conf.h>
-#endif
-#if (OPENSSL_VERSION_NUMBER >= 0x0090800fL) && !defined(OPENSSL_NO_ECDH)
+#ifndef OPENSSL_NO_ECDH
 #include <openssl/ec.h>
 #endif
 
@@ -166,9 +164,7 @@ be_tls_init(void)
 
 	if (!SSL_context)
 	{
-#if SSLEAY_VERSION_NUMBER >= 0x0907000L
 		OPENSSL_config(NULL);
-#endif
 		SSL_library_init();
 		SSL_load_error_strings();
 
@@ -978,7 +974,7 @@ info_cb(const SSL *ssl, int type, int args)
 static void
 initialize_ecdh(void)
 {
-#if (OPENSSL_VERSION_NUMBER >= 0x0090800fL) && !defined(OPENSSL_NO_ECDH)
+#ifndef OPENSSL_NO_ECDH
 	EC_KEY	   *ecdh;
 	int			nid;
 
diff --git a/src/interfaces/libpq/fe-secure-openssl.c b/src/interfaces/libpq/fe-secure-openssl.c
index f6ce1c7a13d..d8716128ec9 100644
--- a/src/interfaces/libpq/fe-secure-openssl.c
+++ b/src/interfaces/libpq/fe-secure-openssl.c
@@ -54,9 +54,7 @@
 #endif
 
 #include <openssl/ssl.h>
-#if (SSLEAY_VERSION_NUMBER >= 0x00907000L)
 #include <openssl/conf.h>
-#endif
 #ifdef USE_SSL_ENGINE
 #include <openssl/engine.h>
 #endif
@@ -848,9 +846,7 @@ pgtls_init(PGconn *conn)
 	{
 		if (pq_init_ssl_lib)
 		{
-#if SSLEAY_VERSION_NUMBER >= 0x00907000L
 			OPENSSL_config(NULL);
-#endif
 			SSL_library_init();
 			SSL_load_error_strings();
 		}
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1183323a445..a94ead04ff3 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -77,7 +77,7 @@ typedef struct
 #include <openssl/ssl.h>
 #include <openssl/err.h>
 
-#if (SSLEAY_VERSION_NUMBER >= 0x00907000L) && !defined(OPENSSL_NO_ENGINE)
+#ifndef OPENSSL_NO_ENGINE
 #define USE_SSL_ENGINE
 #endif
 #endif   /* USE_OPENSSL */