Fix iOS 1 SSL connection

Detect if we're talking to iOS 1 `if (connection->device->version == 0)`
and set `SSL_CTX_set_min_proto_version(ssl_ctx, 0);` to support SSL3.

iOS 1 doesn't understand TLS1_VERSION, it can only speak SSL3_VERSION.
However, modern OpenSSL is usually compiled without SSLv3 support.
So if we set min_proto_version to SSL3_VERSION on an OpenSSL instance which doesn't support it,
it will just ignore min_proto_version altogether and fall back to an even higher version.
To avoid accidentally breaking iOS 2.0+, we set min version to 0 instead.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/idevice.c b/src/idevice.c
index 719cd28..2f4e9ce 100644
--- a/src/idevice.c
+++ b/src/idevice.c
@@ -1245,6 +1245,20 @@ LIBIMOBILEDEVICE_API idevice_error_t idevice_connection_enable_ssl(idevice_conne
         SSL_CTX_set_min_proto_version(ssl_ctx, TLS1_VERSION);
         if (connection->device->version < DEVICE_VERSION(10,0,0)) {
                 SSL_CTX_set_max_proto_version(ssl_ctx, TLS1_VERSION);
+                if (connection->device->version == 0) {
+                        /*
+                                iOS 1 doesn't understand TLS1_VERSION, it can only speak SSL3_VERSION.
+                                However, modern OpenSSL is usually compiled without SSLv3 support.
+                                So if we set min_proto_version to SSL3_VERSION on an OpenSSL instance which doesn't support it,
+                                it will just ignore min_proto_version altogether and fall back to an even higher version.
+                                To avoid accidentally breaking iOS 2.0+, we set min version to 0 instead.
+                                Here is what documentation says:
+                                        Setting the minimum or maximum version to 0,
+                                        will enable protocol versions down to the lowest version,
+                                        or up to the highest version supported by the library, respectively.
+                        */
+                        SSL_CTX_set_min_proto_version(ssl_ctx, 0);
+                }
         }
 #endif
 #if OPENSSL_VERSION_NUMBER >= 0x30000000L