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Add TLS-Exporter options to ssl_client2

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Prints out the exported key on the command line for testing purposes.

Signed-off-by: Max Fillinger <maximilian.fillinger@foxcrypto.com>
This commit is contained in:
Max Fillinger 2024-07-22 15:09:24 +02:00
parent 32ba7f4a17
commit b2718e17e6
1 changed files with 33 additions and 0 deletions
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33
programs/ssl/ssl_client2.c
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@ -102,6 +102,8 @@ int main(void)
#define DFL_NSS_KEYLOG 0
#define DFL_NSS_KEYLOG_FILE NULL
#define DFL_SKIP_CLOSE_NOTIFY 0
#define DFL_EXP_LABEL NULL
#define DFL_EXP_LEN 20
#define DFL_QUERY_CONFIG_MODE 0
#define DFL_USE_SRTP 0
#define DFL_SRTP_FORCE_PROFILE 0
@ -389,6 +391,10 @@ int main(void)
" read_timeout=%%d default: 0 ms (no timeout)\n" \
" max_resend=%%d default: 0 (no resend on timeout)\n" \
" skip_close_notify=%%d default: 0 (send close_notify)\n" \
" exp_label=%%s Label to input into TLS-Exporter\n" \
" default: None (don't try to export a key)\n" \
" exp_len=%%d Length of key to extract from TLS-Exporter \n" \
" default: 20\n" \
"\n" \
USAGE_DTLS \
USAGE_CID \
@ -534,6 +540,8 @@ struct options {
* after renegotiation */
int reproducible; /* make communication reproducible */
int skip_close_notify; /* skip sending the close_notify alert */
const char *exp_label; /* label to input into mbedtls_ssl_export_keying_material() */
int exp_len; /* Lenght of key to export using mbedtls_ssl_export_keying_material() */
#if defined(MBEDTLS_SSL_EARLY_DATA)
int early_data; /* early data enablement flag */
#endif
@ -1412,6 +1420,10 @@ usage:
if (opt.skip_close_notify < 0 || opt.skip_close_notify > 1) {
goto usage;
}
} else if (strcmp(p, "exp_label") == 0) {
opt.exp_label = q;
} else if (strcmp(p, "exp_len") == 0) {
opt.exp_len = atoi(q);
} else if (strcmp(p, "use_srtp") == 0) {
opt.use_srtp = atoi(q);
} else if (strcmp(p, "srtp_force_profile") == 0) {
@ -2485,6 +2497,27 @@ usage:
}
#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
if (opt.exp_label != NULL && opt.exp_len > 0) {
unsigned char *exported_key = calloc((size_t)opt.exp_len, sizeof(unsigned int));
if (exported_key == NULL) {
mbedtls_printf("Could not allocate %d bytes\n", opt.exp_len);
ret = 3;
goto exit;
}
ret = mbedtls_ssl_export_keying_material(&ssl, exported_key, (size_t)opt.exp_len,
opt.exp_label, strlen(opt.exp_label),
NULL, 0, 0);
if (ret != 0) {
goto exit;
}
mbedtls_printf("Exporting key of length %d with label \"%s\": 0x", opt.exp_len, opt.exp_label);
for (i = 0; i < opt.exp_len; i++) {
mbedtls_printf("%02X", exported_key[i]);
}
mbedtls_printf("\n\n");
fflush(stdout);
}
/*
* 6. Write the GET request
*/