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https://github.com/pi-hole/FTL.git
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Dominik
6fc8deed01
pi_hole_extra_headers is a global char[1024] buffer written by API handlers and read/cleared by civetweb's send_additional_header(), but civetweb runs up to 50 worker threads concurrently. When multiple threads handle authenticated requests in parallel, one thread can overwrite or clear another's header data, causing wrong Set-Cookie headers to be sent to wrong clients or cookies to be dropped entirely. Make pi_hole_extra_headers _Thread_local so each worker thread gets its own buffer. This is safe because civetweb handles each request entirely within a single thread. The auth_data session array has a similar race: concurrent threads read/modify sessions without synchronization. Add a pthread mutex protecting all auth_data access, using AUTOLOCK/AUTOUNLOCK macros based on __attribute__((cleanup)) for RAII-style auto-unlock — ensuring the mutex is released on every exit path, including hidden returns inside JSON macros that do `return 500` on allocation failure. Change api->session from a pointer into auth_data to an embedded struct copy so downstream API handlers read from a per-request snapshot rather than shared state. Use JSON_COPY_STR_TO_OBJECT for auth_data strings so the JSON tree owns its own copies after the lock is released. Fixes: #2824 Signed-off-by: Dominik <dl6er@dl6er.de>
31 lines
1.3 KiB
Diff
31 lines
1.3 KiB
Diff
diff --git a/src/webserver/civetweb/civetweb.h b/src/webserver/civetweb/civetweb.h
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index 2ad76693..52724199 100644
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--- a/src/webserver/civetweb/civetweb.h
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+++ b/src/webserver/civetweb/civetweb.h
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@@ -938,6 +938,10 @@ int my_send_http_error_headers(struct mg_connection *conn,
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void FTL_rewrite_pattern(char *filename, size_t filename_buf_len);
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+#define MG_CONFIG_MBEDTLS_DEBUG 3
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+void FTL_mbed_debug(void *user_param, int level, const char *file,
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+ int line, const char *message);
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+
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// Buffer used for additional "Set-Cookie" headers
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#define PIHOLE_HEADERS_MAXLEN 1024
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extern _Thread_local char pi_hole_extra_headers[PIHOLE_HEADERS_MAXLEN];
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diff --git a/src/webserver/civetweb/mod_mbedtls.inl b/src/webserver/civetweb/mod_mbedtls.inl
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index e72685f4..00b9280a 100644
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--- a/src/webserver/civetweb/mod_mbedtls.inl
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+++ b/src/webserver/civetweb/mod_mbedtls.inl
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@@ -83,6 +83,10 @@ mbed_sslctx_init(SSL_CTX *ctx, const char *crt)
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mbedtls_ssl_conf_dbg(conf, mbed_debug, (void *)ctx);
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#endif
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+ /****************** Pi-hole change ******************/
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+ mbedtls_ssl_conf_dbg(conf, FTL_mbed_debug, NULL);
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+ /****************************************************/
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+
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/* Initialize TLS key and cert */
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mbedtls_pk_init(&ctx->pkey);
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mbedtls_ctr_drbg_init(&ctx->ctr);
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