[pitboss/grind] deferred session-0017 (20260522T163126Z-7d60)

src/dynamic/framework/adapters/data_exfil_php.rs

@@ -0,0 +1,234 @@
+//! PHP [`super::super::FrameworkAdapter`] matching outbound-HTTP
+//! sink constructions (`curl_init` / `curl_exec`, `file_get_contents`
+//! against a remote URL, `fopen`/`fsockopen`/`stream_socket_client`,
+//! Guzzle).
+//!
+//! Phase 11 (Track L.9).  Fires when the function body invokes one
+//! of the canonical PHP HTTP-client entry points and the surrounding
+//! source carries the `<?php` script-tag opener (PHP files always
+//! open with a literal `<?php` tag in production code, mirroring the
+//! [`super::crypto_php::CryptoPhpAdapter`] source-signal pattern).
+//!
+//! See sibling adapters
+//! [`super::data_exfil_python::DataExfilPythonAdapter`],
+//! [`super::data_exfil_js::DataExfilJsAdapter`],
+//! [`super::data_exfil_go::DataExfilGoAdapter`],
+//! [`super::data_exfil_ruby::DataExfilRubyAdapter`], and
+//! [`super::data_exfil_java::DataExfilJavaAdapter`] for the same
+//! shape on other languages.
+
+use crate::dynamic::framework::{FrameworkAdapter, FrameworkBinding};
+use crate::evidence::EntryKind;
+use crate::summary::FuncSummary;
+use crate::symbol::Lang;
+
+pub struct DataExfilPhpAdapter;
+
+const ADAPTER_NAME: &str = "data-exfil-php";
+
+fn callee_is_outbound_http(name: &str) -> bool {
+    let last = name.rsplit_once('\\').map(|(_, s)| s).unwrap_or(name);
+    let last = last.rsplit_once("::").map(|(_, s)| s).unwrap_or(last);
+    let last = last.rsplit_once("->").map(|(_, s)| s).unwrap_or(last);
+    matches!(
+        last,
+        "curl_init"
+            | "curl_exec"
+            | "curl_setopt"
+            | "curl_multi_exec"
+            | "file_get_contents"
+            | "fopen"
+            | "fsockopen"
+            | "stream_socket_client"
+            | "stream_context_create"
+            | "get"
+            | "post"
+            | "put"
+            | "delete"
+            | "request"
+            | "sendRequest"
+            | "send"
+    ) || matches!(
+        name,
+        "curl_init"
+            | "curl_exec"
+            | "file_get_contents"
+            | "fopen"
+            | "fsockopen"
+            | "stream_socket_client"
+            | "GuzzleHttp\\Client.get"
+            | "GuzzleHttp\\Client.post"
+            | "GuzzleHttp\\Client.request"
+            | "GuzzleHttp\\Client.send"
+            | "Symfony\\Component\\HttpClient\\HttpClient.create"
+            | "Symfony\\Contracts\\HttpClient\\HttpClientInterface.request"
+    )
+}
+
+fn source_imports_php_http_client(file_bytes: &[u8]) -> bool {
+    const NEEDLES: &[&[u8]] = &[
+        b"<?php",
+        b"<?=",
+        b"GuzzleHttp\\Client",
+        b"GuzzleHttp\\Psr7",
+        b"Symfony\\Component\\HttpClient",
+        b"Symfony\\Contracts\\HttpClient",
+        b"curl_init(",
+        b"curl_exec(",
+        b"file_get_contents(",
+        b"fsockopen(",
+        b"stream_socket_client(",
+    ];
+    NEEDLES
+        .iter()
+        .any(|n| file_bytes.windows(n.len()).any(|w| w == *n))
+}
+
+/// Returns `true` when the surrounding source visibly routes the
+/// outbound URL through a host-allowlist / network-policy gate.
+fn host_routed_through_allowlist(file_bytes: &[u8]) -> bool {
+    const NEEDLES: &[&[u8]] = &[
+        b"ALLOWLIST",
+        b"allowlist",
+        b"ALLOWED_HOSTS",
+        b"allowed_hosts",
+        b"'127.0.0.1'",
+        b"\"127.0.0.1\"",
+        b"'localhost'",
+        b"\"localhost\"",
+        b"in_array($host",
+        b"isset($allow",
+    ];
+    NEEDLES
+        .iter()
+        .any(|n| file_bytes.windows(n.len()).any(|w| w == *n))
+}
+
+impl FrameworkAdapter for DataExfilPhpAdapter {
+    fn name(&self) -> &'static str {
+        ADAPTER_NAME
+    }
+
+    fn lang(&self) -> Lang {
+        Lang::Php
+    }
+
+    fn detect(
+        &self,
+        summary: &FuncSummary,
+        _ast: tree_sitter::Node<'_>,
+        file_bytes: &[u8],
+    ) -> Option<FrameworkBinding> {
+        if host_routed_through_allowlist(file_bytes) {
+            return None;
+        }
+        let matches_call = super::any_callee_matches(summary, callee_is_outbound_http);
+        let matches_source = source_imports_php_http_client(file_bytes);
+        if matches_call && matches_source {
+            Some(FrameworkBinding {
+                adapter: ADAPTER_NAME.to_owned(),
+                kind: EntryKind::Function,
+                route: None,
+                request_params: Vec::new(),
+                response_writer: None,
+                middleware: Vec::new(),
+            })
+        } else {
+            None
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn parse_php(src: &[u8]) -> tree_sitter::Tree {
+        let mut parser = tree_sitter::Parser::new();
+        let lang = tree_sitter::Language::from(tree_sitter_php::LANGUAGE_PHP);
+        parser.set_language(&lang).unwrap();
+        parser.parse(src, None).unwrap()
+    }
+
+    #[test]
+    fn fires_on_curl_init_exec() {
+        let src: &[u8] = b"<?php\nfunction run($host) {\n    $ch = curl_init('http://' . $host . '/exfil');\n    curl_exec($ch);\n}\n";
+        let tree = parse_php(src);
+        let summary = FuncSummary {
+            name: "run".into(),
+            callees: vec![
+                crate::summary::CalleeSite::bare("curl_init"),
+                crate::summary::CalleeSite::bare("curl_exec"),
+            ],
+            ..Default::default()
+        };
+        assert!(
+            DataExfilPhpAdapter
+                .detect(&summary, tree.root_node(), src)
+                .is_some()
+        );
+    }
+
+    #[test]
+    fn fires_on_file_get_contents_remote() {
+        let src: &[u8] = b"<?php\nfunction run($host) {\n    return file_get_contents('http://' . $host . '/exfil');\n}\n";
+        let tree = parse_php(src);
+        let summary = FuncSummary {
+            name: "run".into(),
+            callees: vec![crate::summary::CalleeSite::bare("file_get_contents")],
+            ..Default::default()
+        };
+        assert!(
+            DataExfilPhpAdapter
+                .detect(&summary, tree.root_node(), src)
+                .is_some()
+        );
+    }
+
+    #[test]
+    fn fires_on_guzzle_request() {
+        let src: &[u8] = b"<?php\nuse GuzzleHttp\\Client;\nfunction run($host) {\n    $c = new Client();\n    $c->request('GET', 'http://' . $host);\n}\n";
+        let tree = parse_php(src);
+        let summary = FuncSummary {
+            name: "run".into(),
+            callees: vec![crate::summary::CalleeSite::bare("request")],
+            ..Default::default()
+        };
+        assert!(
+            DataExfilPhpAdapter
+                .detect(&summary, tree.root_node(), src)
+                .is_some()
+        );
+    }
+
+    #[test]
+    fn skips_when_host_in_allowlist_literal() {
+        let src: &[u8] = b"<?php\nfunction run($host) {\n    if ($host !== '127.0.0.1') { return; }\n    $ch = curl_init('http://' . $host);\n    curl_exec($ch);\n}\n";
+        let tree = parse_php(src);
+        let summary = FuncSummary {
+            name: "run".into(),
+            callees: vec![crate::summary::CalleeSite::bare("curl_init")],
+            ..Default::default()
+        };
+        assert!(
+            DataExfilPhpAdapter
+                .detect(&summary, tree.root_node(), src)
+                .is_none()
+        );
+    }
+
+    #[test]
+    fn skips_plain_function() {
+        let src: &[u8] = b"<?php\nfunction add($a, $b) { return $a + $b; }\n";
+        let tree = parse_php(src);
+        let summary = FuncSummary {
+            name: "add".into(),
+            ..Default::default()
+        };
+        assert!(
+            DataExfilPhpAdapter
+                .detect(&summary, tree.root_node(), src)
+                .is_none()
+        );
+    }
+}