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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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