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attempt to improve ssl error handling (again)

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the error queue may contain multiple errors, so make sure to drain it
completely. also, don't try to fall back to errno in case of
SSL_ERROR_SSL.
This commit is contained in:
Oswald Buddenhagen 2019-07-28 11:35:02 +02:00
parent 91abf2b830
commit 5f908b7672
2 changed files with 48 additions and 20 deletions
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1
src/common.h
View File

@ -33,6 +33,7 @@
typedef unsigned char uchar; typedef unsigned char uchar;
typedef unsigned short ushort; typedef unsigned short ushort;
typedef unsigned int uint; typedef unsigned int uint;
typedef unsigned long ulong;
#define as(ar) (sizeof(ar)/sizeof(ar[0])) #define as(ar) (sizeof(ar)/sizeof(ar[0]))

67
src/socket.c
View File

@ -63,6 +63,34 @@ socket_fail( conn_t *conn )
} }
#ifdef HAVE_LIBSSL #ifdef HAVE_LIBSSL
static void ATTR_PRINTFLIKE(1, 2)
print_ssl_errors( const char *fmt, ... )
{
char *action;
va_list va;
ulong err;
va_start( va, fmt );
nfvasprintf( &action, fmt, va );
va_end( va );
while ((err = ERR_get_error()))
error( "Error while %s: %s\n", action, ERR_error_string( err, 0 ) );
free( action );
}
static int
print_ssl_socket_errors( const char *func, conn_t *conn )
{
ulong err;
int num = 0;
while ((err = ERR_get_error())) {
error( "Socket error: secure %s %s: %s\n", func, conn->name, ERR_error_string( err, 0 ) );
num++;
}
return num;
}
static int static int
ssl_return( const char *func, conn_t *conn, int ret ) ssl_return( const char *func, conn_t *conn, int ret )
{ {
@ -76,20 +104,20 @@ ssl_return( const char *func, conn_t *conn, int ret )
FALLTHROUGH FALLTHROUGH
case SSL_ERROR_WANT_READ: case SSL_ERROR_WANT_READ:
return 0; return 0;
case SSL_ERROR_SYSCALL:
case SSL_ERROR_SSL: case SSL_ERROR_SSL:
if (!(err = ERR_get_error())) { print_ssl_socket_errors( func, conn );
if (ret == 0) { break;
case SSL_ERROR_SYSCALL:
if (print_ssl_socket_errors( func, conn ))
break;
if (ret == 0) {
case SSL_ERROR_ZERO_RETURN: case SSL_ERROR_ZERO_RETURN:
/* Callers take the short path out, so signal higher layers from here. */ /* Callers take the short path out, so signal higher layers from here. */
conn->state = SCK_EOF; conn->state = SCK_EOF;
conn->read_callback( conn->callback_aux ); conn->read_callback( conn->callback_aux );
return -1; return -1;
}
sys_error( "Socket error: secure %s %s", func, conn->name );
} else {
error( "Socket error: secure %s %s: %s\n", func, conn->name, ERR_error_string( err, 0 ) );
} }
sys_error( "Socket error: secure %s %s", func, conn->name );
break; break;
default: default:
error( "Socket error: secure %s %s: unhandled SSL error %d\n", func, conn->name, err ); error( "Socket error: secure %s %s: unhandled SSL error %d\n", func, conn->name, err );
@ -233,25 +261,24 @@ init_ssl_ctx( const server_conf_t *conf )
SSL_CTX_set_options( mconf->SSLContext, options ); SSL_CTX_set_options( mconf->SSLContext, options );
if (conf->cert_file && !SSL_CTX_load_verify_locations( mconf->SSLContext, conf->cert_file, 0 )) { if (conf->cert_file && !SSL_CTX_load_verify_locations( mconf->SSLContext, conf->cert_file, 0 )) {
error( "Error while loading certificate file '%s': %s\n", print_ssl_errors( "loading certificate file '%s'", conf->cert_file );
conf->cert_file, ERR_error_string( ERR_get_error(), 0 ) );
return 0; return 0;
} }
mconf->trusted_certs = (_STACK *)sk_X509_OBJECT_dup( X509_STORE_get0_objects( SSL_CTX_get_cert_store( mconf->SSLContext ) ) ); mconf->trusted_certs = (_STACK *)sk_X509_OBJECT_dup( X509_STORE_get0_objects( SSL_CTX_get_cert_store( mconf->SSLContext ) ) );
if (mconf->system_certs && !SSL_CTX_set_default_verify_paths( mconf->SSLContext )) if (mconf->system_certs && !SSL_CTX_set_default_verify_paths( mconf->SSLContext )) {
warn( "Warning: Unable to load default certificate files: %s\n", ulong err;
ERR_error_string( ERR_get_error(), 0 ) ); while ((err = ERR_get_error()))
warn( "Warning: Unable to load default certificate files: %s\n", ERR_error_string( err, 0 ) );
}
SSL_CTX_set_verify( mconf->SSLContext, SSL_VERIFY_NONE, NULL ); SSL_CTX_set_verify( mconf->SSLContext, SSL_VERIFY_NONE, NULL );
if (conf->client_certfile && !SSL_CTX_use_certificate_chain_file( mconf->SSLContext, conf->client_certfile)) { if (conf->client_certfile && !SSL_CTX_use_certificate_chain_file( mconf->SSLContext, conf->client_certfile)) {
error( "Error while loading client certificate file '%s': %s\n", print_ssl_errors( "loading client certificate file '%s'", conf->client_certfile );
conf->client_certfile, ERR_error_string( ERR_get_error(), 0 ) );
return 0; return 0;
} }
if (conf->client_keyfile && !SSL_CTX_use_PrivateKey_file( mconf->SSLContext, conf->client_keyfile, SSL_FILETYPE_PEM)) { if (conf->client_keyfile && !SSL_CTX_use_PrivateKey_file( mconf->SSLContext, conf->client_keyfile, SSL_FILETYPE_PEM)) {
error( "Error while loading client private key '%s': %s\n", print_ssl_errors( "loading client private key '%s'", conf->client_keyfile );
conf->client_keyfile, ERR_error_string( ERR_get_error(), 0 ) );
return 0; return 0;
} }