[Python-checkins] gh-107077: Raise SSLCertVerificationError even if the error is set via SSL_ERROR_SYSCALL (#107586)

[pablogsal]

https://github.com/python/cpython/commit/77e09192b5f1caf14cd5f92ccb53a4592e83e8bc
commit: 77e09192b5f1caf14cd5f92ccb53a4592e83e8bc
branch: main
author: Pablo Galindo Salgado <Pablogsal at gmail.com>
committer: pablogsal <Pablogsal at gmail.com>
date: 2023-08-03T12:37:14Z
summary:

gh-107077: Raise SSLCertVerificationError even if the error is set via SSL_ERROR_SYSCALL (#107586)

Co-authored-by: T. Wouters <thomas at python.org>

files:
A Misc/NEWS.d/next/Library/2023-08-03-12-52-19.gh-issue-107077.-pzHD6.rst
M Modules/_ssl.c

diff --git a/Misc/NEWS.d/next/Library/2023-08-03-12-52-19.gh-issue-107077.-pzHD6.rst b/Misc/NEWS.d/next/Library/2023-08-03-12-52-19.gh-issue-107077.-pzHD6.rst
new file mode 100644
index 0000000000000..ecaf437a48e0a
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-08-03-12-52-19.gh-issue-107077.-pzHD6.rst
@@ -0,0 +1,6 @@
+Seems that in some conditions, OpenSSL will return ``SSL_ERROR_SYSCALL``
+instead of ``SSL_ERROR_SSL`` when a certification verification has failed,
+but the error parameters will still contain ``ERR_LIB_SSL`` and
+``SSL_R_CERTIFICATE_VERIFY_FAILED``. We are now detecting this situation and
+raising the appropiate ``ssl.SSLCertVerificationError``. Patch by Pablo
+Galindo
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index b61d10d9f59fd..c001b875906d4 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -667,6 +667,10 @@ PySSL_SetError(PySSLSocket *sslsock, int ret, const char *filename, int lineno)
                     errstr = "Some I/O error occurred";
                 }
             } else {
+                if (ERR_GET_LIB(e) == ERR_LIB_SSL &&
+                        ERR_GET_REASON(e) == SSL_R_CERTIFICATE_VERIFY_FAILED) {
+                    type = state->PySSLCertVerificationErrorObject;
+                }
                 p = PY_SSL_ERROR_SYSCALL;
             }
             break;