From c82c3462267afdbbaa53e11da0508ce4e03c02b3 Mon Sep 17 00:00:00 2001
From: Richard Levitte <levitte@openssl.org>
Date: Fri, 4 May 2018 14:19:44 +0200
Subject: [PATCH] In cases where we ask PEM_def_callback for minimum 0 length,
 accept 0 length

Fixes #4716

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6173)
---
 CHANGES               | 4 ++++
 crypto/pem/pem_lib.c  | 2 +-
 crypto/pem/pem_pk8.c  | 2 +-
 crypto/pem/pem_pkey.c | 2 +-
 crypto/pem/pvkfmt.c   | 2 +-
 5 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/CHANGES b/CHANGES
index e8b92ccc02..c67a9c61ec 100644
--- a/CHANGES
+++ b/CHANGES
@@ -9,6 +9,10 @@
 
  Changes between 1.1.0h and 1.1.1 [xx XXX xxxx]
 
+  *) When unlocking a pass phrase protected PEM file or PKCS#8 container, we
+     now allow empty (zero character) pass phrases.
+     [Richard Levitte]
+
   *) Apply blinding to binary field modular inversion and remove patent
      pending (OPENSSL_SUN_GF2M_DIV) BN_GF2m_mod_div implementation.
      [Billy Bob Brumley]
diff --git a/crypto/pem/pem_lib.c b/crypto/pem/pem_lib.c
index 5000f268b9..7c82561ba4 100644
--- a/crypto/pem/pem_lib.c
+++ b/crypto/pem/pem_lib.c
@@ -430,7 +430,7 @@ int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
         keylen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
     else
         keylen = callback(buf, PEM_BUFSIZE, 0, u);
-    if (keylen <= 0) {
+    if (keylen < 0) {
         PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ);
         return 0;
     }
diff --git a/crypto/pem/pem_pk8.c b/crypto/pem/pem_pk8.c
index e2c0f3de1d..ebc7fadc57 100644
--- a/crypto/pem/pem_pk8.c
+++ b/crypto/pem/pem_pk8.c
@@ -124,7 +124,7 @@ EVP_PKEY *d2i_PKCS8PrivateKey_bio(BIO *bp, EVP_PKEY **x, pem_password_cb *cb,
         klen = cb(psbuf, PEM_BUFSIZE, 0, u);
     else
         klen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
-    if (klen <= 0) {
+    if (klen < 0) {
         PEMerr(PEM_F_D2I_PKCS8PRIVATEKEY_BIO, PEM_R_BAD_PASSWORD_READ);
         X509_SIG_free(p8);
         return NULL;
diff --git a/crypto/pem/pem_pkey.c b/crypto/pem/pem_pkey.c
index 8730a78913..aa032d2b1c 100644
--- a/crypto/pem/pem_pkey.c
+++ b/crypto/pem/pem_pkey.c
@@ -60,7 +60,7 @@ EVP_PKEY *PEM_read_bio_PrivateKey(BIO *bp, EVP_PKEY **x, pem_password_cb *cb,
             klen = cb(psbuf, PEM_BUFSIZE, 0, u);
         else
             klen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
-        if (klen <= 0) {
+        if (klen < 0) {
             PEMerr(PEM_F_PEM_READ_BIO_PRIVATEKEY, PEM_R_BAD_PASSWORD_READ);
             X509_SIG_free(p8);
             goto err;
diff --git a/crypto/pem/pvkfmt.c b/crypto/pem/pvkfmt.c
index 72ae5ab257..281c6cd95a 100644
--- a/crypto/pem/pvkfmt.c
+++ b/crypto/pem/pvkfmt.c
@@ -686,7 +686,7 @@ static EVP_PKEY *do_PVK_body(const unsigned char **in,
             inlen = cb(psbuf, PEM_BUFSIZE, 0, u);
         else
             inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
-        if (inlen <= 0) {
+        if (inlen < 0) {
             PEMerr(PEM_F_DO_PVK_BODY, PEM_R_BAD_PASSWORD_READ);
             goto err;
         }
-- 
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