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>
18 #include <openssl/x509v3.h>
21 /*****************************************************
22 * Export/import a certificate, binary/printable
23 *****************************************************/
25 tls_export_cert(uschar * buf, size_t buflen, void * cert)
27 BIO * bp = BIO_new(BIO_s_mem());
30 if ((fail = PEM_write_bio_X509(bp, (X509 *)cert) ? 0 : 1))
31 log_write(0, LOG_MAIN, "TLS error in certificate export: %s",
32 ERR_error_string(ERR_get_error(), NULL));
40 if ((n = BIO_gets(bp, cp, (int)buflen)) <= 0) break;
43 cp[-2] = '\\'; cp[-1] = 'n'; /* newline->"\n" */
44 } /* compat with string_printing() */
53 tls_import_cert(const uschar * buf, void ** cert)
55 void * reset_point = store_get(0);
56 const uschar * cp = string_unprinting(US buf);
60 bp = BIO_new_mem_buf(US cp, -1);
61 x = PEM_read_bio_X509(bp, NULL, 0, NULL);
68 store_reset(reset_point);
73 tls_free_cert(void * cert)
75 X509_free((X509 *)cert);
78 /*****************************************************
79 * Certificate field extraction routines
80 *****************************************************/
82 bio_string_copy(BIO * bp, int len)
85 len = len > 0 ? (int) BIO_get_mem_data(bp, &cp) : 0;
86 cp = string_copyn(cp, len);
92 asn1_time_copy(const ASN1_TIME * time)
94 BIO * bp = BIO_new(BIO_s_mem());
95 int len = ASN1_TIME_print(bp, time);
96 return bio_string_copy(bp, len);
100 x509_name_copy(X509_NAME * name)
102 BIO * bp = BIO_new(BIO_s_mem());
104 X509_NAME_print_ex(bp, name, 0, XN_FLAG_RFC2253) >= 0
106 return bio_string_copy(bp, len_good);
112 tls_cert_issuer(void * cert, uschar * mod)
114 uschar * cp = x509_name_copy(X509_get_issuer_name((X509 *)cert));
115 return mod ? tls_field_from_dn(cp, mod) : cp;
119 tls_cert_not_before(void * cert, uschar * mod)
121 return asn1_time_copy(X509_get_notBefore((X509 *)cert));
125 tls_cert_not_after(void * cert, uschar * mod)
127 return asn1_time_copy(X509_get_notAfter((X509 *)cert));
131 tls_cert_serial_number(void * cert, uschar * mod)
134 BIO * bp = BIO_new(BIO_s_mem());
135 int len = i2a_ASN1_INTEGER(bp, X509_get_serialNumber((X509 *)cert));
137 if (len < sizeof(txt))
138 BIO_read(bp, txt, len);
142 return string_copynlc(txt, len); /* lowercase */
146 tls_cert_signature(void * cert, uschar * mod)
148 BIO * bp = BIO_new(BIO_s_mem());
151 if (X509_print_ex(bp, (X509 *)cert, 0,
152 X509_FLAG_NO_HEADER | X509_FLAG_NO_VERSION | X509_FLAG_NO_SERIAL |
153 X509_FLAG_NO_SIGNAME | X509_FLAG_NO_ISSUER | X509_FLAG_NO_VALIDITY |
154 X509_FLAG_NO_SUBJECT | X509_FLAG_NO_PUBKEY | X509_FLAG_NO_EXTENSIONS |
155 /* X509_FLAG_NO_SIGDUMP is the missing one */
156 X509_FLAG_NO_AUX) == 1)
158 long len = BIO_get_mem_data(bp, &cp);
159 cp = string_copyn(cp, len);
166 tls_cert_signature_algorithm(void * cert, uschar * mod)
168 return string_copy(US OBJ_nid2ln(X509_get_signature_type((X509 *)cert)));
172 tls_cert_subject(void * cert, uschar * mod)
174 uschar * cp = x509_name_copy(X509_get_subject_name((X509 *)cert));
175 return mod ? tls_field_from_dn(cp, mod) : cp;
179 tls_cert_version(void * cert, uschar * mod)
181 return string_sprintf("%d", X509_get_version((X509 *)cert));
185 tls_cert_ext_by_oid(void * cert, uschar * oid, int idx)
187 int nid = OBJ_create(CS oid, "", "");
188 int nidx = X509_get_ext_by_NID((X509 *)cert, nid, idx);
189 X509_EXTENSION * ex = X509_get_ext((X509 *)cert, nidx);
190 ASN1_OCTET_STRING * adata = X509_EXTENSION_get_data(ex);
191 BIO * bp = BIO_new(BIO_s_mem());
197 M_ASN1_OCTET_STRING_print(bp, adata);
198 /* binary data, DER encoded */
200 /* just dump for now */
201 len = BIO_get_mem_data(bp, &cp1);
202 cp3 = cp2 = store_get(len*3+1);
206 sprintf(CS cp2, "%.2x ", *cp1++);
216 tls_cert_subject_altname(void * cert, uschar * mod)
218 uschar * list = NULL;
219 STACK_OF(GENERAL_NAME) * san = (STACK_OF(GENERAL_NAME) *)
220 X509_get_ext_d2i((X509 *)cert, NID_subject_alt_name, NULL, NULL);
226 if (!san) return NULL;
230 if (*mod == '>' && *++mod) sep = *mod++;
231 else if (Ustrcmp(mod, "dns")==0) { match = GEN_DNS; mod += 3; }
232 else if (Ustrcmp(mod, "uri")==0) { match = GEN_URI; mod += 3; }
233 else if (Ustrcmp(mod, "mail")==0) { match = GEN_EMAIL; mod += 4; }
240 while (sk_GENERAL_NAME_num(san) > 0)
242 GENERAL_NAME * namePart = sk_GENERAL_NAME_pop(san);
243 if (match != -1 && match != namePart->type)
245 switch (namePart->type)
249 ele = ASN1_STRING_data(namePart->d.dNSName);
253 ele = ASN1_STRING_data(namePart->d.uniformResourceIdentifier);
257 ele = ASN1_STRING_data(namePart->d.rfc822Name);
260 continue; /* ignore unrecognised types */
262 list = string_append_listele(list, sep,
263 match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
266 sk_GENERAL_NAME_free(san);
271 tls_cert_ocsp_uri(void * cert, uschar * mod)
273 STACK_OF(ACCESS_DESCRIPTION) * ads = (STACK_OF(ACCESS_DESCRIPTION) *)
274 X509_get_ext_d2i((X509 *)cert, NID_info_access, NULL, NULL);
275 int adsnum = sk_ACCESS_DESCRIPTION_num(ads);
278 uschar * list = NULL;
281 if (*mod == '>' && *++mod) sep = *mod++;
283 for (i = 0; i < adsnum; i++)
285 ACCESS_DESCRIPTION * ad = sk_ACCESS_DESCRIPTION_value(ads, i);
287 if (ad && OBJ_obj2nid(ad->method) == NID_ad_OCSP)
288 list = string_append_listele(list, sep,
289 ASN1_STRING_data(ad->location->d.ia5));
295 tls_cert_crl_uri(void * cert, uschar * mod)
297 STACK_OF(DIST_POINT) * dps = (STACK_OF(DIST_POINT) *)
298 X509_get_ext_d2i((X509 *)cert, NID_crl_distribution_points,
301 int dpsnum = sk_DIST_POINT_num(dps);
304 uschar * list = NULL;
307 if (*mod == '>' && *++mod) sep = *mod++;
309 if (dps) for (i = 0; i < dpsnum; i++)
310 if ((dp = sk_DIST_POINT_value(dps, i)))
312 STACK_OF(GENERAL_NAME) * names = dp->distpoint->name.fullname;
314 int nnum = sk_GENERAL_NAME_num(names);
317 for (j = 0; j < nnum; j++)
318 if ( (np = sk_GENERAL_NAME_value(names, j))
319 && np->type == GEN_URI
321 list = string_append_listele(list, sep,
322 ASN1_STRING_data(np->d.uniformResourceIdentifier));
329 /*****************************************************
330 * Certificate operator routines
331 *****************************************************/
333 fingerprint(X509 * cert, const EVP_MD * fdig)
337 uschar md[EVP_MAX_MD_SIZE];
340 if (!X509_digest(cert,fdig,md,&n))
342 expand_string_message = US"tls_cert_fprt: out of mem\n";
345 cp = store_get(n*2+1);
346 for (j = 0; j < (int)n; j++) sprintf(CS cp+2*j, "%02X", md[j]);
351 tls_cert_fprt_md5(void * cert)
353 return fingerprint((X509 *)cert, EVP_md5());
357 tls_cert_fprt_sha1(void * cert)
359 return fingerprint((X509 *)cert, EVP_sha1());
363 tls_cert_fprt_sha256(void * cert)
365 return fingerprint((X509 *)cert, EVP_sha256());
371 /* End of tlscert-openssl.c */