gnu: OpenSSL: Add upstream patch to preserve compatibility in EOF handling.

This is a follow-up to ad8254c23a86c3ca4ca32bc68fc8d76954aa80fd, which
unexpectedly caused a test failure in the Python test suite.

* gnu/packages/patches/openssl-1.1.1e-revert-detect-eof.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/tls.scm (openssl)[source](patches): Add it.

2 files changed, 82 insertions, 1 deletions

diff --git a/gnu/packages/patches/openssl-1.1.1e-revert-detect-eof.patch b/gnu/packages/patches/openssl-1.1.1e-revert-detect-eof.patch
new file mode 100644
index 0000000000..973559440f
--- /dev/null
+++ b/gnu/packages/patches/openssl-1.1.1e-revert-detect-eof.patch
@@ -0,0 +1,80 @@
+This patch reverts a change in 1.1.1e that can break applications that do
+not expect EOF to be reported via SSL_ERROR_SSL.
+
+https://bugs.python.org/issue40018
+https://github.com/openssl/openssl/pull/11400
+https://github.com/openssl/openssl/commit/0cd2ee64bffcdece599c3e4b5fac3830a55dc0fa
+
+Taken from upstream:
+https://github.com/openssl/openssl/commit/30d190caf311d534867df97e26b552e628cb7d85
+
+diff --git a/crypto/err/openssl.txt b/crypto/err/openssl.txt
+index f5324c6819d8..35512f9caf96 100644
+--- a/crypto/err/openssl.txt
++++ b/crypto/err/openssl.txt
+@@ -2852,7 +2852,6 @@ SSL_R_UNABLE_TO_LOAD_SSL3_MD5_ROUTINES:242:unable to load ssl3 md5 routines
+ SSL_R_UNABLE_TO_LOAD_SSL3_SHA1_ROUTINES:243:unable to load ssl3 sha1 routines
+ SSL_R_UNEXPECTED_CCS_MESSAGE:262:unexpected ccs message
+ SSL_R_UNEXPECTED_END_OF_EARLY_DATA:178:unexpected end of early data
+-SSL_R_UNEXPECTED_EOF_WHILE_READING:294:unexpected eof while reading
+ SSL_R_UNEXPECTED_MESSAGE:244:unexpected message
+ SSL_R_UNEXPECTED_RECORD:245:unexpected record
+ SSL_R_UNINITIALIZED:276:uninitialized
+diff --git a/include/openssl/sslerr.h b/include/openssl/sslerr.h
+index 0ef684f3c131..ba4c4ae5fbd3 100644
+--- a/include/openssl/sslerr.h
++++ b/include/openssl/sslerr.h
+@@ -1,6 +1,6 @@
+ /*
+  * Generated by util/mkerr.pl DO NOT EDIT
+- * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
++ * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
+  *
+  * Licensed under the OpenSSL license (the "License").  You may not use
+  * this file except in compliance with the License.  You can obtain a copy
+@@ -734,7 +734,6 @@ int ERR_load_SSL_strings(void);
+ # define SSL_R_UNABLE_TO_LOAD_SSL3_SHA1_ROUTINES          243
+ # define SSL_R_UNEXPECTED_CCS_MESSAGE                     262
+ # define SSL_R_UNEXPECTED_END_OF_EARLY_DATA               178
+-# define SSL_R_UNEXPECTED_EOF_WHILE_READING               294
+ # define SSL_R_UNEXPECTED_MESSAGE                         244
+ # define SSL_R_UNEXPECTED_RECORD                          245
+ # define SSL_R_UNINITIALIZED                              276
+diff --git a/ssl/record/rec_layer_s3.c b/ssl/record/rec_layer_s3.c
+index 1c885a664f35..b2a7a47eb075 100644
+--- a/ssl/record/rec_layer_s3.c
++++ b/ssl/record/rec_layer_s3.c
+@@ -296,12 +296,6 @@ int ssl3_read_n(SSL *s, size_t n, size_t max, int extend, int clearold,
+             ret = BIO_read(s->rbio, pkt + len + left, max - left);
+             if (ret >= 0)
+                 bioread = ret;
+-            if (ret <= 0
+-                    && !BIO_should_retry(s->rbio)
+-                    && BIO_eof(s->rbio)) {
+-                SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_SSL3_READ_N,
+-                         SSL_R_UNEXPECTED_EOF_WHILE_READING);
+-            }
+         } else {
+             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_READ_N,
+                      SSL_R_READ_BIO_NOT_SET);
+diff --git a/ssl/ssl_err.c b/ssl/ssl_err.c
+index a0c7b79659d4..4b12ed1485d9 100644
+--- a/ssl/ssl_err.c
++++ b/ssl/ssl_err.c
+@@ -1,6 +1,6 @@
+ /*
+  * Generated by util/mkerr.pl DO NOT EDIT
+- * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
++ * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
+  *
+  * Licensed under the OpenSSL license (the "License").  You may not use
+  * this file except in compliance with the License.  You can obtain a copy
+@@ -1205,8 +1205,6 @@ static const ERR_STRING_DATA SSL_str_reasons[] = {
+     "unexpected ccs message"},
+     {ERR_PACK(ERR_LIB_SSL, 0, SSL_R_UNEXPECTED_END_OF_EARLY_DATA),
+     "unexpected end of early data"},
+-    {ERR_PACK(ERR_LIB_SSL, 0, SSL_R_UNEXPECTED_EOF_WHILE_READING),
+-    "unexpected eof while reading"},
+     {ERR_PACK(ERR_LIB_SSL, 0, SSL_R_UNEXPECTED_MESSAGE), "unexpected message"},
+     {ERR_PACK(ERR_LIB_SSL, 0, SSL_R_UNEXPECTED_RECORD), "unexpected record"},
+     {ERR_PACK(ERR_LIB_SSL, 0, SSL_R_UNINITIALIZED), "uninitialized"},
diff --git a/gnu/packages/tls.scm b/gnu/packages/tls.scm
index f6310222b9..a057432f4b 100644
--- a/gnu/packages/tls.scm
+++ b/gnu/packages/tls.scm
@@ -293,7 +293,8 @@ required structures.")
              (sha256
               (base32
                "1gnwlri1dphr5wdzmg9vlhkh6aq2yqgpfkpmffzwjlfb26n62kv9"))
-             (patches (search-patches "openssl-1.1-c-rehash-in.patch"))))
+             (patches (search-patches "openssl-1.1-c-rehash-in.patch"
+                                      "openssl-1.1.1e-revert-detect-eof.patch"))))
    (build-system gnu-build-system)
    (outputs '("out"
               "doc"         ;6.8 MiB of man3 pages and full HTML documentation