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BoringSSL compatibility fixes (#1892)

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This patch is necessary to build cpp-httplib in Crashpad, itself in
Chromium, using BoringSSL. Details at [1].

The fixes include:
 - Library version check: tolerate BoringSSL as an alternative to
   OpenSSL 3.
 - Don’t call `OPENSSL_thread_stop`, which is not in BoringSSL.
 - Use `SSL_get_peer_certificate` (deprecated in OpenSSL 3), the old
   name for `SSL_get1_peer_certificate`, because the new name is not in
   BoringSSL.
 - Call `SSL_set_tlsext_host_name` directly instead of making an
   `SSL_ctrl` call that BoringSSL does not support. The feared
   -Wold-style-cast warning that occurs when buidling with OpenSSL is
   not triggered in BoringSSL.

[1] 1a62a01825
This commit is contained in:
Mark Mentovai 2024-08-08 11:47:56 -04:00 committed by GitHub
parent ae63b89cbf
commit 69c84c9597
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GPG key ID: B5690EEEBB952194
1 changed files with 11 additions and 3 deletions
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14
httplib.h
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@ -269,7 +269,12 @@ using socket_t = int;
#include <iostream>
#include <sstream>
#if OPENSSL_VERSION_NUMBER < 0x30000000L
#if defined(OPENSSL_IS_BORINGSSL)
#if OPENSSL_VERSION_NUMBER < 0x1010107f
#error Please use OpenSSL or a current version of BoringSSL
#endif
#define SSL_get1_peer_certificate SSL_get_peer_certificate
#elif OPENSSL_VERSION_NUMBER < 0x30000000L
#error Sorry, OpenSSL versions prior to 3.0.0 are not supported
#endif
@ -727,7 +732,7 @@ private:
fn();
}
#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
#if defined(CPPHTTPLIB_OPENSSL_SUPPORT) && !defined(OPENSSL_IS_BORINGSSL)
OPENSSL_thread_stop();
#endif
}
@ -9121,11 +9126,14 @@ inline bool SSLClient::initialize_ssl(Socket &socket, Error &error) {
return true;
},
[&](SSL *ssl2) {
#if defined(OPENSSL_IS_BORINGSSL)
SSL_set_tlsext_host_name(ssl2, host_.c_str());
#else
// NOTE: Direct call instead of using the OpenSSL macro to suppress
// -Wold-style-cast warning
// SSL_set_tlsext_host_name(ssl2, host_.c_str());
SSL_ctrl(ssl2, SSL_CTRL_SET_TLSEXT_HOSTNAME, TLSEXT_NAMETYPE_host_name,
static_cast<void *>(const_cast<char *>(host_.c_str())));
#endif
return true;
});