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#include "tunala.h"
#ifndef NO_OPENSSL
/* For callbacks generating output, here are their file-descriptors. */
static FILE *fp_cb_ssl_info = NULL;
static FILE *fp_cb_ssl_verify = NULL;
/* Output level:
* 0 = nothing,
* 1 = minimal, just errors,
* 2 = minimal, all steps,
* 3 = detail, all steps */
static unsigned int cb_ssl_verify_level = 1;
/* Other static rubbish (to mirror s_cb.c where required) */
static int int_verify_depth = 10;
/* This function is largely borrowed from the one used in OpenSSL's "s_client"
* and "s_server" utilities. */
void cb_ssl_info(const SSL *s, int where, int ret)
{
const char *str1, *str2;
int w;
if(!fp_cb_ssl_info)
return;
w = where & ~SSL_ST_MASK;
str1 = (w & SSL_ST_CONNECT ? "SSL_connect" : (w & SSL_ST_ACCEPT ?
"SSL_accept" : "undefined")),
str2 = SSL_state_string_long(s);
if (where & SSL_CB_LOOP)
fprintf(fp_cb_ssl_info, "(%s) %s\n", str1, str2);
else if (where & SSL_CB_EXIT) {
if (ret == 0)
fprintf(fp_cb_ssl_info, "(%s) failed in %s\n", str1, str2);
/* In a non-blocking model, we get a few of these "error"s simply because we're
* calling "reads" and "writes" on the state-machine that are virtual NOPs
* simply to avoid wasting the time seeing if we *should* call them. Removing
* this case makes the "-out_state" output a lot easier on the eye. */
#if 0
else if (ret < 0)
fprintf(fp_cb_ssl_info, "%s:error in %s\n", str1, str2);
#endif
}
}
void cb_ssl_info_set_output(FILE *fp)
{
fp_cb_ssl_info = fp;
}
static const char *int_reason_no_issuer = "X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT";
static const char *int_reason_not_yet = "X509_V_ERR_CERT_NOT_YET_VALID";
static const char *int_reason_before = "X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD";
static const char *int_reason_expired = "X509_V_ERR_CERT_HAS_EXPIRED";
static const char *int_reason_after = "X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD";
/* Stolen wholesale from apps/s_cb.c :-) And since then, mutilated ... */
int cb_ssl_verify(int ok, X509_STORE_CTX *ctx)
{
char buf1[256]; /* Used for the subject name */
char buf2[256]; /* Used for the issuer name */
const char *reason = NULL; /* Error reason (if any) */
X509 *err_cert;
int err, depth;
if(!fp_cb_ssl_verify || (cb_ssl_verify_level == 0))
return ok;
err_cert = X509_STORE_CTX_get_current_cert(ctx);
err = X509_STORE_CTX_get_error(ctx);
depth = X509_STORE_CTX_get_error_depth(ctx);
buf1[0] = buf2[0] = '\0';
/* Fill buf1 */
X509_NAME_oneline(X509_get_subject_name(err_cert), buf1, 256);
/* Fill buf2 */
X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), buf2, 256);
switch (ctx->error) {
case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
reason = int_reason_no_issuer;
break;
case X509_V_ERR_CERT_NOT_YET_VALID:
reason = int_reason_not_yet;
break;
case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
reason = int_reason_before;
break;
case X509_V_ERR_CERT_HAS_EXPIRED:
reason = int_reason_expired;
break;
case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
reason = int_reason_after;
break;
}
if((cb_ssl_verify_level == 1) && ok)
return ok;
fprintf(fp_cb_ssl_verify, "chain-depth=%d, ", depth);
if(reason)
fprintf(fp_cb_ssl_verify, "error=%s\n", reason);
else
fprintf(fp_cb_ssl_verify, "error=%d\n", err);
if(cb_ssl_verify_level < 3)
return ok;
fprintf(fp_cb_ssl_verify, "--> subject = %s\n", buf1);
fprintf(fp_cb_ssl_verify, "--> issuer = %s\n", buf2);
if(!ok)
fprintf(fp_cb_ssl_verify,"--> verify error:num=%d:%s\n",err,
X509_verify_cert_error_string(err));
fprintf(fp_cb_ssl_verify, "--> verify return:%d\n",ok);
return ok;
}
void cb_ssl_verify_set_output(FILE *fp)
{
fp_cb_ssl_verify = fp;
}
void cb_ssl_verify_set_depth(unsigned int verify_depth)
{
int_verify_depth = verify_depth;
}
void cb_ssl_verify_set_level(unsigned int level)
{
if(level < 4)
cb_ssl_verify_level = level;
}
RSA *cb_generate_tmp_rsa(SSL *s, int is_export, int keylength)
{
/* TODO: Perhaps make it so our global key can be generated on-the-fly
* after certain intervals? */
static RSA *rsa_tmp = NULL;
BIGNUM *bn = NULL;
int ok = 1;
if(!rsa_tmp) {
ok = 0;
if(!(bn = BN_new()))
goto end;
if(!BN_set_word(bn, RSA_F4))
goto end;
if(!(rsa_tmp = RSA_new()))
goto end;
if(!RSA_generate_key_ex(rsa_tmp, keylength, bn, NULL))
goto end;
ok = 1;
}
end:
if(bn)
BN_free(bn);
if(!ok) {
RSA_free(rsa_tmp);
rsa_tmp = NULL;
}
return rsa_tmp;
}
#endif /* !defined(NO_OPENSSL) */
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