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 */