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Fix SSL error handling by youknowone · Pull Request #6351 · RustPython/RustPython · GitHub

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Fix SSL error handling #6351

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Merged
youknowone merged 1 commit into from
Dec 8, 2025
Conversation 6 Commits 1 Checks 12 Files changed
Merged

Fix SSL error handling #6351

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24 changes: 19 additions & 5 deletions crates/stdlib/src/ssl.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1254,18 +1254,29 @@ mod _ssl {
} else {
// [SSL] PEM lib
super::compat::SslError::create_ssl_error_with_reason(
vm, "SSL", "", "PEM lib",
vm,
Some("SSL"),
"",
"PEM lib",
)
}
}
// PEM parsing errors - [SSL] PEM lib
_ => super::compat::SslError::create_ssl_error_with_reason(
vm, "SSL", "", "PEM lib",
vm,
Some("SSL"),
"",
"PEM lib",
),
}
} else {
// Unknown error type - [SSL] PEM lib
super::compat::SslError::create_ssl_error_with_reason(vm, "SSL", "", "PEM lib")
super::compat::SslError::create_ssl_error_with_reason(
vm,
Some("SSL"),
"",
"PEM lib",
)
}
Comment on lines 1256 to 1280

coderabbitai Bot Dec 8, 2025

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

⚠️ Potential issue | 🟠 Major

PEM error calls pass empty reason string; swap reason/message usage

In load_cert_chain, the non-password PEM error paths build the SSL error as:

super::compat::SslError::create_ssl_error_with_reason(
    vm,
    Some("SSL"),
    "",
    "PEM lib",
)

(and similarly in the _ and non-io::Error branches).

Per create_ssl_error_with_reason’s contract and other call sites, reason should hold a short reason like "PEM lib", while message is the main display string. Using an empty reason here means exc.reason is not informative and is inconsistent with comments like // [SSL] PEM lib and with usages such as the NO_START_LINE path.

Recommend at least giving reason a non-empty value and, ideally, including the [SSL] … prefix in the message, e.g.:

- super::compat::SslError::create_ssl_error_with_reason(
-     vm,
-     Some("SSL"),
-     "",
-     "PEM lib",
- )
+ super::compat::SslError::create_ssl_error_with_reason(
+     vm,
+     Some("SSL"),
+     "PEM lib",
+     "[SSL] PEM lib",
+ )

Apply the same pattern to the _ arm and the else branch so that all PEM-lib errors expose a consistent and non-empty reason attribute.

🤖 Prompt for AI Agents 
In crates/stdlib/src/ssl.rs around lines 1256 to 1280, the PEM error branches
call create_ssl_error_with_reason(vm, Some("SSL"), "", "PEM lib") leaving the
reason empty; change these calls so reason receives a short non-empty identifier
(e.g. "PEM lib") and message receives the full display string (e.g. "[SSL] PEM
lib" or include context), i.e. swap the empty-string reason and the current
message value so exc.reason is informative; apply the same change to the `_` arm
and the final `else` branch so all PEM parsing error paths consistently pass a
non-empty reason and an appropriate message.

})?;

Expand Down Expand Up @@ -1866,7 +1877,7 @@ mod _ssl {
// [PEM: NO_START_LINE] no start line
return Err(super::compat::SslError::create_ssl_error_with_reason(
vm,
"PEM",
Some("PEM"),
"NO_START_LINE",
"[PEM: NO_START_LINE] no start line",
));
Expand Down Expand Up @@ -2127,7 +2138,10 @@ mod _ssl {
}
// PEM parsing errors
_ => super::compat::SslError::create_ssl_error_with_reason(
vm, "X509", "", "PEM lib",
vm,
Some("X509"),
"",
"PEM lib",
),
Comment on lines +2141 to 2145

coderabbitai Bot Dec 8, 2025

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

⚠️ Potential issue | 🟠 Major

X509 PEM parsing errors also use empty reason; align with helper semantics

In load_certs_from_file_helper, PEM parsing errors are converted via:

_ => super::compat::SslError::create_ssl_error_with_reason(
    vm,
    Some("X509"),
    "",
    "PEM lib",
),

This shares the same problem as the PEM-lib errors above: reason is "" while message is "PEM lib", contrary to the helper’s documentation and other usages. This makes exc.reason effectively unusable and diverges from the intended CPython-style (library, reason) pairing.

Consider updating to something like:

- _ => super::compat::SslError::create_ssl_error_with_reason(
-     vm,
-     Some("X509"),
-     "",
-     "PEM lib",
- ),
+ _ => super::compat::SslError::create_ssl_error_with_reason(
+     vm,
+     Some("X509"),
+     "PEM lib",
+     "[X509] PEM lib",
+ ),

so that callers relying on exc.reason and exc.library see consistent values.

🤖 Prompt for AI Agents 
In crates/stdlib/src/ssl.rs around lines 2141-2145, PEM parsing errors currently
call create_ssl_error_with_reason(vm, Some("X509"), "", "PEM lib") which leaves
exc.reason empty; change the call to provide the library as Some("X509"), set
reason to "PEM lib" and message to "" (i.e., create_ssl_error_with_reason(vm,
Some("X509"), "PEM lib", "")) so exc.reason and exc.library follow the helper’s
intended (library, reason) semantics.

}
})
Expand Down
32 changes: 23 additions & 9 deletions crates/stdlib/src/ssl/compat.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -473,19 +473,25 @@ impl SslError {
/// If attribute setting fails (extremely rare), returns the exception without attributes
pub(super) fn create_ssl_error_with_reason(
vm: &VirtualMachine,
library: &str,
library: Option<&str>,
reason: &str,
message: impl Into<String>,
) -> PyBaseExceptionRef {
let exc = vm.new_exception_msg(PySSLError::class(&vm.ctx).to_owned(), message.into());
let msg = message.into();
// SSLError args should be (errno, message) format
// FIXME: Use 1 as generic SSL error code
let exc = vm.new_exception(
PySSLError::class(&vm.ctx).to_owned(),
vec![vm.new_pyobj(1i32), vm.new_pyobj(msg)],
);

// Set library and reason attributes
// Ignore errors as they're extremely rare (e.g., out of memory)
let _ = exc.as_object().set_attr(
"library",
vm.ctx.new_str(library).as_object().to_owned(),
vm,
);
let library_obj = match library {
Some(lib) => vm.ctx.new_str(lib).as_object().to_owned(),
None => vm.ctx.none(),
};
let _ = exc.as_object().set_attr("library", library_obj, vm);
let _ =
exc.as_object()
.set_attr("reason", vm.ctx.new_str(reason).as_object().to_owned(), vm);
Expand Down Expand Up @@ -524,7 +530,12 @@ impl SslError {
.unwrap_or("UNKNOWN");

// Delegate to create_ssl_error_with_reason for actual exception creation
Self::create_ssl_error_with_reason(vm, lib_str, reason_str, format!("[SSL] {reason_str}"))
Self::create_ssl_error_with_reason(
vm,
Some(lib_str),
reason_str,
format!("[SSL] {reason_str}"),
)
}

/// Convert to Python exception
Expand All @@ -533,7 +544,10 @@ impl SslError {
SslError::WantRead => create_ssl_want_read_error(vm),
SslError::WantWrite => create_ssl_want_write_error(vm),
SslError::Timeout(msg) => timeout_error_msg(vm, msg),
SslError::Syscall(msg) => vm.new_os_error(msg),
SslError::Syscall(msg) => {
// Create SSLError with library=None for syscall errors during SSL operations
Self::create_ssl_error_with_reason(vm, None, &msg, msg.clone())
}
SslError::Ssl(msg) => vm.new_exception_msg(
PySSLError::class(&vm.ctx).to_owned(),
format!("SSL error: {msg}"),
Expand Down
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