1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) Jeremy Harris 2014 */
7 /* This module provides TLS (aka SSL) support for Exim using the OpenSSL
8 library. It is #included into the tls.c file when that library is used.
14 #include <openssl/lhash.h>
15 #include <openssl/ssl.h>
16 #include <openssl/err.h>
17 #include <openssl/rand.h>
20 /*****************************************************
21 * Export/import a certificate, binary/printable
22 *****************************************************/
24 tls_export_cert(uschar * buf, size_t buflen, void * cert)
26 BIO * bp = BIO_new(BIO_s_mem());
29 if ((fail = PEM_write_bio_X509(bp, (X509 *)cert) ? 0 : 1))
30 log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
31 ERR_error_string(ERR_get_error(), NULL));
39 if ((n = BIO_gets(bp, cp, (int)buflen)) <= 0) break;
42 cp[-2] = '\\'; cp[-1] = 'n'; /* newline->"\n" */
43 } /* compat with string_printing() */
52 tls_import_cert(const uschar * buf, void ** cert)
54 void * reset_point = store_get(0);
55 const uschar * cp = string_unprinting(US buf);
59 bp = BIO_new_mem_buf(US cp, -1);
60 x = PEM_read_bio_X509(bp, NULL, 0, NULL);
67 store_reset(reset_point);
72 tls_free_cert(void * cert)
74 X509_free((X509 *)cert);
77 /*****************************************************
78 * Certificate field extraction routines
79 *****************************************************/
81 bio_string_copy(BIO * bp, int len)
84 len = len > 0 ? (int) BIO_get_mem_data(bp, &cp) : 0;
85 cp = string_copyn(cp, len);
91 asn1_time_copy(const ASN1_TIME * time)
93 BIO * bp = BIO_new(BIO_s_mem());
94 int len = ASN1_TIME_print(bp, time);
95 return bio_string_copy(bp, len);
99 x509_name_copy(X509_NAME * name)
101 BIO * bp = BIO_new(BIO_s_mem());
103 X509_NAME_print_ex(bp, name, 0, XN_FLAG_RFC2253) >= 0
105 return bio_string_copy(bp, len_good);
111 tls_cert_issuer(void * cert)
113 return x509_name_copy(X509_get_issuer_name((X509 *)cert));
117 tls_cert_not_before(void * cert)
119 return asn1_time_copy(X509_get_notBefore((X509 *)cert));
123 tls_cert_not_after(void * cert)
125 return asn1_time_copy(X509_get_notAfter((X509 *)cert));
129 tls_cert_serial_number(void * cert)
132 BIO * bp = BIO_new(BIO_s_mem());
133 int len = i2a_ASN1_INTEGER(bp, X509_get_serialNumber((X509 *)cert));
135 if (len < sizeof(txt))
136 BIO_read(bp, txt, len);
140 return string_copynlc(txt, len); /* lowercase */
144 tls_cert_signature(void * cert)
146 BIO * bp = BIO_new(BIO_s_mem());
149 if (X509_print_ex(bp, (X509 *)cert, 0,
150 X509_FLAG_NO_HEADER | X509_FLAG_NO_VERSION | X509_FLAG_NO_SERIAL |
151 X509_FLAG_NO_SIGNAME | X509_FLAG_NO_ISSUER | X509_FLAG_NO_VALIDITY |
152 X509_FLAG_NO_SUBJECT | X509_FLAG_NO_PUBKEY | X509_FLAG_NO_EXTENSIONS |
153 /* X509_FLAG_NO_SIGDUMP is the missing one */
154 X509_FLAG_NO_AUX) == 1)
156 long len = BIO_get_mem_data(bp, &cp);
157 cp = string_copyn(cp, len);
164 tls_cert_signature_algorithm(void * cert)
166 return string_copy(OBJ_nid2ln(X509_get_signature_type((X509 *)cert)));
170 tls_cert_subject(void * cert)
172 return x509_name_copy(X509_get_subject_name((X509 *)cert));
176 tls_cert_version(void * cert)
178 return string_sprintf("%d", X509_get_version((X509 *)cert));
182 tls_cert_ext_by_oid(void * cert, uschar * oid, int idx)
184 int nid = OBJ_create(oid, "", "");
185 int nidx = X509_get_ext_by_NID((X509 *)cert, nid, idx);
186 X509_EXTENSION * ex = X509_get_ext((X509 *)cert, nidx);
187 ASN1_OCTET_STRING * adata = X509_EXTENSION_get_data(ex);
188 BIO * bp = BIO_new(BIO_s_mem());
194 M_ASN1_OCTET_STRING_print(bp, adata);
195 /* binary data, DER encoded */
197 /* just dump for now */
198 len = BIO_get_mem_data(bp, &cp1);
199 cp3 = cp2 = store_get(len*3+1);
203 sprintf(cp2, "%.2x ", *cp1++);
213 tls_cert_subject_altname(void * cert)
216 STACK_OF(GENERAL_NAME) * san = (STACK_OF(GENERAL_NAME) *)
217 X509_get_ext_d2i((X509 *)cert, NID_subject_alt_name, NULL, NULL);
219 if (!san) return NULL;
221 while (sk_GENERAL_NAME_num(san) > 0)
223 GENERAL_NAME * namePart = sk_GENERAL_NAME_pop(san);
224 switch (namePart->type)
227 cp = string_sprintf("URI=%s",
228 ASN1_STRING_data(namePart->d.uniformResourceIdentifier));
231 cp = string_sprintf("email=%s",
232 ASN1_STRING_data(namePart->d.rfc822Name));
235 cp = string_sprintf("Unrecognisable");
240 /* sk_GENERAL_NAME_pop_free(gen_names, GENERAL_NAME_free); ??? */
245 tls_cert_ocsp_uri(void * cert)
247 STACK_OF(ACCESS_DESCRIPTION) * ads = (STACK_OF(ACCESS_DESCRIPTION) *)
248 X509_get_ext_d2i((X509 *)cert, NID_info_access, NULL, NULL);
249 int adsnum = sk_ACCESS_DESCRIPTION_num(ads);
252 for (i = 0; i < adsnum; i++)
254 ACCESS_DESCRIPTION * ad = sk_ACCESS_DESCRIPTION_value(ads, i);
256 if (ad && OBJ_obj2nid(ad->method) == NID_ad_OCSP)
257 return string_copy( ASN1_STRING_data(ad->location->d.ia5) );
264 tls_cert_crl_uri(void * cert)
266 STACK_OF(DIST_POINT) * dps = (STACK_OF(DIST_POINT) *)
267 X509_get_ext_d2i((X509 *)cert, NID_crl_distribution_points,
270 int dpsnum = sk_DIST_POINT_num(dps);
273 if (dps) for (i = 0; i < dpsnum; i++)
274 if ((dp = sk_DIST_POINT_value(dps, i)))
276 STACK_OF(GENERAL_NAME) * names = dp->distpoint->name.fullname;
278 int nnum = sk_GENERAL_NAME_num(names);
281 for (j = 0; j < nnum; j++)
282 if ( (np = sk_GENERAL_NAME_value(names, j))
283 && np->type == GEN_URI
285 return string_copy(ASN1_STRING_data(
286 np->d.uniformResourceIdentifier));
293 /* End of tlscert-openssl.c */