[3.11] gh-107077: Raise SSLCertVerificationError even if the error is…

… set via SSL_ERROR_SYSCALL (GH-107586) (#107588) Co-authored-by: Pablo Galindo Salgado <[email protected]> Co-authored-by: T. Wouters <[email protected]>
python · Aug 3, 2023 · 4f65f03 · 4f65f03
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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
@@ -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
@@ -650,6 +650,10 @@ 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;