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s_server: Report an error if init-connection fails without an attempt to read #18154

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s_server: Report an error if init-connection fails without an attempt to read #18154

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85e987e
s_serve: Report an error if init-connection fails without an attempt …
faramir-dev Apr 28, 2022
d2db590
fixup! s_serve: Report an error if init-connection fails without an a…
faramir-dev May 1, 2022
bf47c09
fixup! s_serve: Report an error if init-connection fails without an a…
faramir-dev May 5, 2022
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45 changes: 41 additions & 4 deletions apps/s_server.c
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Expand Up @@ -2328,6 +2328,30 @@ static void print_stats(BIO *bio, SSL_CTX *ssl_ctx)
SSL_CTX_sess_get_cache_size(ssl_ctx));
}

static long count_reads_callback(BIO *bio, int cmd, const char *argp, size_t len,
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Since we're being pedantic about the int part: long int.

int argi, long argl, int ret, size_t *processed)
{
unsigned int *p_counter = (unsigned int *)BIO_get_callback_arg(bio);

switch (cmd) {
case BIO_CB_READ: /* No break here */
case BIO_CB_GETS:
if (p_counter != NULL)
++*p_counter;
break;
default:
break;
}

if (s_debug) {
BIO_set_callback_arg(bio, (char *)bio_s_out);
ret = (int)bio_dump_callback(bio, cmd, argp, len, argi, argl, ret, processed);
BIO_set_callback_arg(bio, (char *)p_counter);
}

return ret;
}

static int sv_body(int s, int stype, int prot, unsigned char *context)
{
char *buf = NULL;
Expand Down Expand Up @@ -2456,10 +2480,7 @@ static int sv_body(int s, int stype, int prot, unsigned char *context)
SSL_set_accept_state(con);
/* SSL_set_fd(con,s); */

if (s_debug) {
BIO_set_callback_ex(SSL_get_rbio(con), bio_dump_callback);
BIO_set_callback_arg(SSL_get_rbio(con), (char *)bio_s_out);
}
BIO_set_callback_ex(SSL_get_rbio(con), count_reads_callback);
if (s_msg) {
#ifndef OPENSSL_NO_SSL_TRACE
if (s_msg == 2)
Expand Down Expand Up @@ -2737,8 +2758,24 @@ static int sv_body(int s, int stype, int prot, unsigned char *context)
*/
if ((!async || !SSL_waiting_for_async(con))
&& !SSL_is_init_finished(con)) {
/*
* Count number of reads during init_ssl_connection.
* It helps us to recognise configuration errors and errors
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* caused by a client.
*/
unsigned int read_counter = 0;
BIO_set_callback_arg(SSL_get_rbio(con), (char *)&read_counter);
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i = init_ssl_connection(con);
BIO_set_callback_arg(SSL_get_rbio(con), NULL);

/*
* If initialization fails without reads, then
* there was a fatal error in configuration.
*/
if (i <= 0 && read_counter == 0) {
ret = -1;
goto err;
}
if (i < 0) {
ret = 0;
goto err;
Expand Down