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/* $OpenBSD: ca.c,v 1.101 2024/02/13 12:25:11 tobhe Exp $ */
/*
* Copyright (c) 2010-2013 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <dirent.h>
#include <string.h>
#include <signal.h>
#include <syslog.h>
#include <errno.h>
#include <err.h>
#include <event.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/pem.h>
#include <openssl/evp.h>
#include <openssl/sha.h>
#include <openssl/rsa.h>
#include "iked.h"
#include "ikev2.h"
void ca_run(struct privsep *, struct privsep_proc *, void *);
void ca_shutdown(void);
void ca_reset(struct iked *);
int ca_reload(struct iked *);
int ca_cert_local(struct iked *, X509 *);
int ca_getreq(struct iked *, struct imsg *);
int ca_getcert(struct iked *, struct imsg *);
int ca_getauth(struct iked *, struct imsg *);
X509 *ca_by_subjectpubkey(X509_STORE *, uint8_t *, size_t);
X509 *ca_by_issuer(X509_STORE *, X509_NAME *, struct iked_static_id *);
X509 *ca_by_subjectaltname(X509_STORE *, struct iked_static_id *);
void ca_store_certs_info(const char *, X509_STORE *);
int ca_subjectpubkey_digest(X509 *, uint8_t *, unsigned int *);
int ca_x509_subject_cmp(X509 *, struct iked_static_id *);
int ca_validate_pubkey(struct iked *, struct iked_static_id *,
void *, size_t, struct iked_id *);
int ca_validate_cert(struct iked *, struct iked_static_id *,
void *, size_t, STACK_OF(X509) *, X509 **);
EVP_PKEY *
ca_bytes_to_pkey(uint8_t *, size_t);
int ca_privkey_to_method(struct iked_id *);
struct ibuf *
ca_x509_serialize(X509 *);
int ca_x509_subjectaltname_do(X509 *, int, const char *,
struct iked_static_id *, struct iked_id *);
int ca_x509_subjectaltname_cmp(X509 *, struct iked_static_id *);
int ca_x509_subjectaltname_log(X509 *, const char *);
int ca_x509_subjectaltname_get(X509 *cert, struct iked_id *);
int ca_dispatch_parent(int, struct privsep_proc *, struct imsg *);
int ca_dispatch_ikev2(int, struct privsep_proc *, struct imsg *);
int ca_dispatch_control(int, struct privsep_proc *, struct imsg *);
void ca_store_info(struct iked *, struct imsg *, const char *, X509_STORE *);
static struct privsep_proc procs[] = {
{ "parent", PROC_PARENT, ca_dispatch_parent },
{ "ikev2", PROC_IKEV2, ca_dispatch_ikev2 },
{ "control", PROC_CONTROL, ca_dispatch_control }
};
struct ca_store {
X509_STORE *ca_cas;
X509_LOOKUP *ca_calookup;
X509_STORE *ca_certs;
X509_LOOKUP *ca_certlookup;
struct iked_id ca_privkey;
struct iked_id ca_pubkey;
uint8_t ca_privkey_method;
};
void
caproc(struct privsep *ps, struct privsep_proc *p)
{
proc_run(ps, p, procs, nitems(procs), ca_run, NULL);
}
void
ca_run(struct privsep *ps, struct privsep_proc *p, void *arg)
{
struct iked *env = iked_env;
struct ca_store *store;
/*
* pledge in the ca process:
* stdio - for malloc and basic I/O including events.
* rpath - for certificate files.
* recvfd - for ocsp sockets.
*/
if (pledge("stdio rpath recvfd", NULL) == -1)
fatal("pledge");
if ((store = calloc(1, sizeof(*store))) == NULL)
fatal("%s: failed to allocate cert store", __func__);
env->sc_priv = store;
p->p_shutdown = ca_shutdown;
}
void
ca_shutdown(void)
{
struct iked *env = iked_env;
struct ca_store *store;
ibuf_free(env->sc_certreq);
if ((store = env->sc_priv) == NULL)
return;
X509_STORE_free(store->ca_cas);
X509_STORE_free(store->ca_certs);
ibuf_free(store->ca_pubkey.id_buf);
ibuf_free(store->ca_privkey.id_buf);
free(store);
}
void
ca_getkey(struct privsep *ps, struct iked_id *key, enum imsg_type type)
{
struct iked *env = iked_env;
struct ca_store *store = env->sc_priv;
struct iked_id *id = NULL;
const char *name;
if (store == NULL)
fatalx("%s: invalid store", __func__);
if (type == IMSG_PRIVKEY) {
name = "private";
id = &store->ca_privkey;
store->ca_privkey_method = ca_privkey_to_method(key);
if (store->ca_privkey_method == IKEV2_AUTH_NONE)
fatalx("ca: failed to get auth method for privkey");
} else if (type == IMSG_PUBKEY) {
name = "public";
id = &store->ca_pubkey;
} else
fatalx("%s: invalid type %d", __func__, type);
log_debug("%s: received %s key type %s length %zd", __func__,
name, print_map(key->id_type, ikev2_cert_map),
ibuf_length(key->id_buf));
/* clear old key and copy new one */
ibuf_free(id->id_buf);
memcpy(id, key, sizeof(*id));
}
void
ca_reset(struct iked *env)
{
struct ca_store *store = env->sc_priv;
if (store->ca_privkey.id_type == IKEV2_ID_NONE ||
store->ca_pubkey.id_type == IKEV2_ID_NONE)
fatalx("ca_reset: keys not loaded");
X509_STORE_free(store->ca_cas);
X509_STORE_free(store->ca_certs);
if ((store->ca_cas = X509_STORE_new()) == NULL)
fatalx("ca_reset: failed to get ca store");
if ((store->ca_calookup = X509_STORE_add_lookup(store->ca_cas,
X509_LOOKUP_file())) == NULL)
fatalx("ca_reset: failed to add ca lookup");
if ((store->ca_certs = X509_STORE_new()) == NULL)
fatalx("ca_reset: failed to get cert store");
if ((store->ca_certlookup = X509_STORE_add_lookup(store->ca_certs,
X509_LOOKUP_file())) == NULL)
fatalx("ca_reset: failed to add cert lookup");
if (ca_reload(env) != 0)
fatal("ca_reset: reload");
}
int
ca_certbundle_add(struct ibuf *buf, struct iked_id *id)
{
uint8_t type = id->id_type;
size_t len = ibuf_size(id->id_buf);
void *val = ibuf_data(id->id_buf);
if (buf == NULL ||
ibuf_add(buf, &type, sizeof(type)) != 0 ||
ibuf_add(buf, &len, sizeof(len)) != 0 ||
ibuf_add(buf, val, len) != 0)
return -1;
return 0;
}
/*
* decode cert bundle to cert and untrusted intermediate CAs.
* datap/lenp point to bundle on input and to decoded cert output
*/
static int
ca_decode_cert_bundle(struct iked *env, struct iked_sahdr *sh,
uint8_t **datap, size_t *lenp, STACK_OF(X509) **untrustedp)
{
STACK_OF(X509) *untrusted = NULL;
X509 *cert;
BIO *rawcert = NULL;
uint8_t *certdata = NULL;
size_t certlen = 0;
uint8_t datatype;
size_t datalen = 0;
uint8_t *ptr;
size_t len;
int ret = -1;
log_debug("%s: decoding cert bundle", SPI_SH(sh, __func__));
ptr = *datap;
len = *lenp;
*untrustedp = NULL;
/* allocate stack for intermediate CAs */
if ((untrusted = sk_X509_new_null()) == NULL)
goto done;
/* parse TLV, see ca_certbundle_add() */
while (len > 0) {
/* Type */
if (len < sizeof(datatype)) {
log_debug("%s: short data (type)",
SPI_SH(sh, __func__));
goto done;
}
memcpy(&datatype, ptr, sizeof(datatype));
ptr += sizeof(datatype);
len -= sizeof(datatype);
/* Only X509 certs/CAs are supported */
if (datatype != IKEV2_CERT_X509_CERT) {
log_info("%s: unsupported data type: %s",
SPI_SH(sh, __func__),
print_map(datatype, ikev2_cert_map));
goto done;
}
/* Length */
if (len < sizeof(datalen)) {
log_info("%s: short data (len)",
SPI_SH(sh, __func__));
goto done;
}
memcpy(&datalen, ptr, sizeof(datalen));
ptr += sizeof(datalen);
len -= sizeof(datalen);
/* Value */
if (len < datalen) {
log_info("%s: short len %zu < datalen %zu",
SPI_SH(sh, __func__), len, datalen);
goto done;
}
if (certdata == NULL) {
/* First entry is cert */
certdata = ptr;
certlen = datalen;
} else {
/* All other entries are intermediate CAs */
rawcert = BIO_new_mem_buf(ptr, datalen);
if (rawcert == NULL)
goto done;
cert = d2i_X509_bio(rawcert, NULL);
BIO_free(rawcert);
if (cert == NULL) {
log_warnx("%s: cannot parse CA",
SPI_SH(sh, __func__));
ca_sslerror(__func__);
goto done;
}
if (!sk_X509_push(untrusted, cert)) {
log_warnx("%s: cannot store CA",
SPI_SH(sh, __func__));
X509_free(cert);
goto done;
}
}
ptr += datalen;
len -= datalen;
}
log_debug("%s: decoded cert bundle", SPI_SH(sh, __func__));
*datap = certdata;
*lenp = certlen;
*untrustedp = untrusted;
untrusted = NULL;
ret = 0;
done:
if (ret != 0)
log_info("%s: failed to decode cert bundle",
SPI_SH(sh, __func__));
sk_X509_free(untrusted);
return ret;
}
int
ca_dispatch_parent(int fd, struct privsep_proc *p, struct imsg *imsg)
{
struct iked *env = iked_env;
unsigned int mode;
switch (imsg->hdr.type) {
case IMSG_CTL_ACTIVE:
case IMSG_CTL_PASSIVE:
/*
* send back to indicate we have processed
* all messages from parent.
*/
proc_compose(&env->sc_ps, PROC_PARENT, imsg->hdr.type, NULL, 0);
break;
case IMSG_CTL_RESET:
IMSG_SIZE_CHECK(imsg, &mode);
memcpy(&mode, imsg->data, sizeof(mode));
if (mode == RESET_ALL || mode == RESET_CA) {
log_debug("%s: config reset", __func__);
ca_reset(env);
}
break;
case IMSG_OCSP_FD:
ocsp_receive_fd(env, imsg);
break;
case IMSG_OCSP_CFG:
config_getocsp(env, imsg);
break;
case IMSG_PRIVKEY:
case IMSG_PUBKEY:
config_getkey(env, imsg);
break;
case IMSG_CTL_STATIC:
config_getstatic(env, imsg);
break;
default:
return (-1);
}
return (0);
}
int
ca_dispatch_ikev2(int fd, struct privsep_proc *p, struct imsg *imsg)
{
struct iked *env = iked_env;
switch (imsg->hdr.type) {
case IMSG_CERTREQ:
ca_getreq(env, imsg);
break;
case IMSG_CERT:
ca_getcert(env, imsg);
break;
case IMSG_AUTH:
ca_getauth(env, imsg);
break;
default:
return (-1);
}
return (0);
}
int
ca_dispatch_control(int fd, struct privsep_proc *p, struct imsg *imsg)
{
struct iked *env = iked_env;
struct ca_store *store = env->sc_priv;
switch (imsg->hdr.type) {
case IMSG_CTL_SHOW_CERTSTORE:
ca_store_info(env, imsg, "CA", store->ca_cas);
ca_store_info(env, imsg, "CERT", store->ca_certs);
/* Send empty reply to indicate end of information. */
proc_compose_imsg(&env->sc_ps, PROC_CONTROL, -1,
IMSG_CTL_SHOW_CERTSTORE, imsg->hdr.peerid,
-1, NULL, 0);
break;
default:
return (-1);
}
return (0);
}
int
ca_setcert(struct iked *env, struct iked_sahdr *sh, struct iked_id *id,
uint8_t type, uint8_t *data, size_t len, enum privsep_procid procid)
{
struct iovec iov[4];
int iovcnt = 0;
struct iked_static_id idb;
/* Must send the cert and a valid Id to the ca process */
if (procid == PROC_CERT) {
if (id == NULL || id->id_type == IKEV2_ID_NONE ||
ibuf_size(id->id_buf) > IKED_ID_SIZE)
return (-1);
bzero(&idb, sizeof(idb));
/* Convert to a static Id */
idb.id_type = id->id_type;
idb.id_offset = id->id_offset;
idb.id_length = ibuf_size(id->id_buf);
memcpy(&idb.id_data, ibuf_data(id->id_buf),
ibuf_size(id->id_buf));
iov[iovcnt].iov_base = &idb;
iov[iovcnt].iov_len = sizeof(idb);
iovcnt++;
}
iov[iovcnt].iov_base = sh;
iov[iovcnt].iov_len = sizeof(*sh);
iovcnt++;
iov[iovcnt].iov_base = &type;
iov[iovcnt].iov_len = sizeof(type);
iovcnt++;
if (data != NULL) {
iov[iovcnt].iov_base = data;
iov[iovcnt].iov_len = len;
iovcnt++;
}
if (proc_composev(&env->sc_ps, procid, IMSG_CERT, iov, iovcnt) == -1)
return (-1);
return (0);
}
static int
ca_setscert(struct iked *env, struct iked_sahdr *sh, uint8_t type, X509 *cert)
{
struct iovec iov[3];
int iovcnt = 0;
struct ibuf *buf;
int ret;
if ((buf = ca_x509_serialize(cert)) == NULL)
return (-1);
iov[iovcnt].iov_base = sh;
iov[iovcnt].iov_len = sizeof(*sh);
iovcnt++;
iov[iovcnt].iov_base = &type;
iov[iovcnt].iov_len = sizeof(type);
iovcnt++;
iov[iovcnt].iov_base = ibuf_data(buf);
iov[iovcnt].iov_len = ibuf_size(buf);
iovcnt++;
ret = proc_composev(&env->sc_ps, PROC_IKEV2, IMSG_SCERT, iov, iovcnt);
ibuf_free(buf);
return (ret);
}
int
ca_setreq(struct iked *env, struct iked_sa *sa,
struct iked_static_id *localid, uint8_t type, uint8_t more, uint8_t *data,
size_t len, enum privsep_procid procid)
{
struct iovec iov[5];
int iovcnt = 0;
struct iked_static_id idb;
struct iked_id id;
int ret = -1;
/* Convert to a static Id */
bzero(&id, sizeof(id));
if (ikev2_policy2id(localid, &id, 1) != 0)
return (-1);
if (ibuf_size(id.id_buf) > IKED_ID_SIZE)
return (-1);
bzero(&idb, sizeof(idb));
idb.id_type = id.id_type;
idb.id_offset = id.id_offset;
idb.id_length = ibuf_size(id.id_buf);
memcpy(&idb.id_data, ibuf_data(id.id_buf), ibuf_size(id.id_buf));
iov[iovcnt].iov_base = &idb;
iov[iovcnt].iov_len = sizeof(idb);
iovcnt++;
iov[iovcnt].iov_base = &sa->sa_hdr;
iov[iovcnt].iov_len = sizeof(sa->sa_hdr);
iovcnt++;
iov[iovcnt].iov_base = &type;
iov[iovcnt].iov_len = sizeof(type);
iovcnt++;
iov[iovcnt].iov_base = &more;
iov[iovcnt].iov_len = sizeof(more);
iovcnt++;
if (data != NULL) {
iov[iovcnt].iov_base = data;
iov[iovcnt].iov_len = len;
iovcnt++;
}
if (proc_composev(&env->sc_ps, procid, IMSG_CERTREQ, iov, iovcnt) == -1)
goto done;
sa_stateflags(sa, IKED_REQ_CERTREQ);
ret = 0;
done:
ibuf_free(id.id_buf);
return (ret);
}
static int
auth_sig_compatible(uint8_t type)
{
switch (type) {
case IKEV2_AUTH_RSA_SIG:
case IKEV2_AUTH_ECDSA_256:
case IKEV2_AUTH_ECDSA_384:
case IKEV2_AUTH_ECDSA_521:
case IKEV2_AUTH_SIG_ANY:
return (1);
}
return (0);
}
int
ca_setauth(struct iked *env, struct iked_sa *sa,
struct ibuf *authmsg, enum privsep_procid id)
{
struct iovec iov[3];
int iovcnt = 3;
struct iked_policy *policy = sa->sa_policy;
uint8_t type = policy->pol_auth.auth_method;
if (id == PROC_CERT) {
/* switch encoding to IKEV2_AUTH_SIG if SHA2 is supported */
if (sa->sa_sigsha2 && auth_sig_compatible(type)) {
log_debug("%s: switching %s to SIG", __func__,
print_map(type, ikev2_auth_map));
type = IKEV2_AUTH_SIG;
} else if (!sa->sa_sigsha2 && type == IKEV2_AUTH_SIG_ANY) {
log_debug("%s: switching SIG to RSA_SIG(*)", __func__);
/* XXX ca might auto-switch to ECDSA */
type = IKEV2_AUTH_RSA_SIG;
} else if (type == IKEV2_AUTH_SIG) {
log_debug("%s: using SIG (RFC7427)", __func__);
}
}
if (type == IKEV2_AUTH_SHARED_KEY_MIC) {
sa->sa_stateflags |= IKED_REQ_AUTH;
return (ikev2_msg_authsign(env, sa,
&policy->pol_auth, authmsg));
}
iov[0].iov_base = &sa->sa_hdr;
iov[0].iov_len = sizeof(sa->sa_hdr);
iov[1].iov_base = &type;
iov[1].iov_len = sizeof(type);
if (type == IKEV2_AUTH_NONE)
iovcnt--;
else {
iov[2].iov_base = ibuf_data(authmsg);
iov[2].iov_len = ibuf_size(authmsg);
log_debug("%s: auth length %zu", __func__, ibuf_size(authmsg));
}
if (proc_composev(&env->sc_ps, id, IMSG_AUTH, iov, iovcnt) == -1)
return (-1);
return (0);
}
int
ca_getcert(struct iked *env, struct imsg *imsg)
{
struct ca_store *store = env->sc_priv;
X509 *issuer = NULL, *cert;
STACK_OF(X509) *untrusted = NULL;
EVP_PKEY *certkey;
struct iked_sahdr sh;
uint8_t type;
uint8_t *ptr;
size_t len;
struct iked_static_id id;
unsigned int i;
struct iovec iov[3];
int iovcnt = 3, cmd, ret = 0;
struct iked_id key;
ptr = (uint8_t *)imsg->data;
len = IMSG_DATA_SIZE(imsg);
i = sizeof(id) + sizeof(sh) + sizeof(type);
if (len < i)
return (-1);
memcpy(&id, ptr, sizeof(id));
if (id.id_type == IKEV2_ID_NONE)
return (-1);
memcpy(&sh, ptr + sizeof(id), sizeof(sh));
memcpy(&type, ptr + sizeof(id) + sizeof(sh), sizeof(uint8_t));
ptr += i;
len -= i;
bzero(&key, sizeof(key));
if (type == IKEV2_CERT_BUNDLE &&
ca_decode_cert_bundle(env, &sh, &ptr, &len, &untrusted) == 0)
type = IKEV2_CERT_X509_CERT;
switch (type) {
case IKEV2_CERT_X509_CERT:
/* Look in local cert storage first */
cert = ca_by_subjectaltname(store->ca_certs, &id);
if (cert) {
log_debug("%s: found local cert", __func__);
if ((certkey = X509_get0_pubkey(cert)) != NULL) {
ret = ca_pubkey_serialize(certkey, &key);
if (ret == 0) {
ptr = ibuf_data(key.id_buf);
len = ibuf_size(key.id_buf);
type = key.id_type;
break;
}
}
}
if (env->sc_ocsp_url == NULL)
ret = ca_validate_cert(env, &id, ptr, len, untrusted, NULL);
else {
ret = ca_validate_cert(env, &id, ptr, len, untrusted, &issuer);
if (ret == 0) {
ret = ocsp_validate_cert(env, ptr, len, sh,
type, issuer);
X509_free(issuer);
if (ret == 0) {
sk_X509_free(untrusted);
return (0);
}
} else
X509_free(issuer);
}
break;
case IKEV2_CERT_RSA_KEY:
case IKEV2_CERT_ECDSA:
ret = ca_validate_pubkey(env, &id, ptr, len, NULL);
break;
case IKEV2_CERT_NONE:
/* Fallback to public key */
ret = ca_validate_pubkey(env, &id, NULL, 0, &key);
if (ret == 0) {
ptr = ibuf_data(key.id_buf);
len = ibuf_size(key.id_buf);
type = key.id_type;
}
break;
default:
log_debug("%s: unsupported cert type %d", __func__, type);
ret = -1;
break;
}
if (ret == 0)
cmd = IMSG_CERTVALID;
else
cmd = IMSG_CERTINVALID;
iov[0].iov_base = &sh;
iov[0].iov_len = sizeof(sh);
iov[1].iov_base = &type;
iov[1].iov_len = sizeof(type);
iov[2].iov_base = ptr;
iov[2].iov_len = len;
ret = proc_composev(&env->sc_ps, PROC_IKEV2, cmd, iov, iovcnt);
ibuf_free(key.id_buf);
sk_X509_free(untrusted);
return (ret);
}
static unsigned int
ca_chain_by_issuer(struct ca_store *store, X509_NAME *subject,
struct iked_static_id *id, X509 **dst, size_t dstlen)
{
STACK_OF(X509_OBJECT) *h;
X509_OBJECT *xo;
X509 *cert;
int i;
unsigned int n;
X509_NAME *issuer, *subj;
if (subject == NULL || dstlen == 0)
return (0);
if ((cert = ca_by_issuer(store->ca_certs, subject, id)) != NULL) {
*dst = cert;
return (1);
}
h = X509_STORE_get0_objects(store->ca_cas);
for (i = 0; i < sk_X509_OBJECT_num(h); i++) {
xo = sk_X509_OBJECT_value(h, i);
if (X509_OBJECT_get_type(xo) != X509_LU_X509)
continue;
cert = X509_OBJECT_get0_X509(xo);
if ((issuer = X509_get_issuer_name(cert)) == NULL)
continue;
if (X509_NAME_cmp(subject, issuer) == 0) {
if ((subj = X509_get_subject_name(cert)) == NULL)
continue;
/* Skip root CAs */
if (X509_NAME_cmp(subj, issuer) == 0)
continue;
n = ca_chain_by_issuer(store, subj, id,
dst + 1, dstlen - 1);
if (n > 0) {
*dst = cert;
return (n + 1);
}
}
}
return (0);
}
int
ca_getreq(struct iked *env, struct imsg *imsg)
{
struct ca_store *store = env->sc_priv;
struct iked_sahdr sh;
uint8_t type, more;
uint8_t *ptr;
size_t len;
unsigned int i;
X509 *ca = NULL, *cert = NULL;
X509 *chain[IKED_SCERT_MAX + 1];
size_t chain_len = 0;
struct ibuf *buf;
struct iked_static_id id;
char idstr[IKED_ID_SIZE];
X509_NAME *subj;
char *subj_name;
ptr = (uint8_t *)imsg->data;
len = IMSG_DATA_SIZE(imsg);
i = sizeof(id) + sizeof(type) + sizeof(sh) + sizeof(more);
if (len < i)
return (-1);
memcpy(&id, ptr, sizeof(id));
if (id.id_type == IKEV2_ID_NONE)
return (-1);
memcpy(&sh, ptr + sizeof(id), sizeof(sh));
memcpy(&type, ptr + sizeof(id) + sizeof(sh), sizeof(type));
memcpy(&more, ptr + sizeof(id) + sizeof(sh) + sizeof(type), sizeof(more));
ptr += i;
len -= i;
switch (type) {
case IKEV2_CERT_RSA_KEY:
case IKEV2_CERT_ECDSA:
/*
* Find a local raw public key that matches the type
* received in the CERTREQ payoad
*/
if (store->ca_pubkey.id_type != type ||
store->ca_pubkey.id_buf == NULL)
goto fallback;
buf = ibuf_dup(store->ca_pubkey.id_buf);
log_debug("%s: using local public key of type %s", __func__,
print_map(type, ikev2_cert_map));
break;
case IKEV2_CERT_X509_CERT:
if (len == 0 || len % SHA_DIGEST_LENGTH) {
log_info("%s: invalid CERTREQ data.",
SPI_SH(&sh, __func__));
return (-1);
}
/*
* Find a local certificate signed by any of the CAs
* received in the CERTREQ payload
*/
for (i = 0; i < len; i += SHA_DIGEST_LENGTH) {
if ((ca = ca_by_subjectpubkey(store->ca_cas, ptr + i,
SHA_DIGEST_LENGTH)) == NULL)
continue;
subj = X509_get_subject_name(ca);
if (subj == NULL)
return (-1);
subj_name = X509_NAME_oneline(subj, NULL, 0);
if (subj_name == NULL)
return (-1);
log_debug("%s: found CA %s", __func__, subj_name);
OPENSSL_free(subj_name);
chain_len = ca_chain_by_issuer(store, subj, &id,
chain, nitems(chain));
if (chain_len > 0) {
cert = chain[chain_len - 1];
if (!ca_cert_local(env, cert)) {
log_info("%s: found cert with matching "
"ID but without matching key.",
SPI_SH(&sh, __func__));
continue;
}
break;
}
}
for (i = chain_len; i >= 2; i--)
ca_setscert(env, &sh, type, chain[i - 2]);
/* Fallthrough */
case IKEV2_CERT_NONE:
fallback:
/*
* If no certificate or key matching any of the trust-anchors
* was found and this was the last CERTREQ, try to find one with
* subjectAltName matching the ID
*/
if (cert == NULL && more)
return (0);
if (cert == NULL)
cert = ca_by_subjectaltname(store->ca_certs, &id);
/* Set type if coming from fallback */
if (cert != NULL)
type = IKEV2_CERT_X509_CERT;
/* If there is no matching certificate use local raw pubkey */
if (cert == NULL) {
if (ikev2_print_static_id(&id, idstr, sizeof(idstr)) == -1)
return (-1);
log_info("%s: no valid local certificate found for %s",
SPI_SH(&sh, __func__), idstr);
ca_store_certs_info(SPI_SH(&sh, __func__),
store->ca_certs);
if (store->ca_pubkey.id_buf == NULL)
return (-1);
buf = ibuf_dup(store->ca_pubkey.id_buf);
type = store->ca_pubkey.id_type;
log_info("%s: using local public key of type %s",
SPI_SH(&sh, __func__),
print_map(type, ikev2_cert_map));
break;
}
subj = X509_get_subject_name(cert);
if (subj == NULL)
return (-1);
subj_name = X509_NAME_oneline(subj, NULL, 0);
if (subj_name == NULL)
return (-1);
log_debug("%s: found local certificate %s", __func__,
subj_name);
OPENSSL_free(subj_name);
if ((buf = ca_x509_serialize(cert)) == NULL)
return (-1);
break;
default:
log_warnx("%s: unknown cert type requested",
SPI_SH(&sh, __func__));
return (-1);
}
ca_setcert(env, &sh, NULL, type,
ibuf_data(buf), ibuf_size(buf), PROC_IKEV2);
ibuf_free(buf);
return (0);
}
int
ca_getauth(struct iked *env, struct imsg *imsg)
{
struct ca_store *store = env->sc_priv;
struct iked_sahdr sh;
uint8_t method;
uint8_t *ptr;
size_t len;
unsigned int i;
int ret = -1;
struct iked_sa sa;
struct iked_policy policy;
struct iked_id *id;
struct ibuf *authmsg;
ptr = (uint8_t *)imsg->data;
len = IMSG_DATA_SIZE(imsg);
i = sizeof(method) + sizeof(sh);
if (len <= i)
return (-1);
memcpy(&sh, ptr, sizeof(sh));
memcpy(&method, ptr + sizeof(sh), sizeof(uint8_t));
if (method == IKEV2_AUTH_SHARED_KEY_MIC)
return (-1);
ptr += i;
len -= i;
if ((authmsg = ibuf_new(ptr, len)) == NULL)
return (-1);
/*
* Create fake SA and policy
*/
bzero(&sa, sizeof(sa));
bzero(&policy, sizeof(policy));
memcpy(&sa.sa_hdr, &sh, sizeof(sh));
sa.sa_policy = &policy;
if (sh.sh_initiator)
id = &sa.sa_icert;
else
id = &sa.sa_rcert;
memcpy(id, &store->ca_privkey, sizeof(*id));
policy.pol_auth.auth_method = method == IKEV2_AUTH_SIG ?
method : store->ca_privkey_method;
if (ikev2_msg_authsign(env, &sa, &policy.pol_auth, authmsg) != 0) {
log_debug("%s: AUTH sign failed", __func__);
policy.pol_auth.auth_method = IKEV2_AUTH_NONE;
}
ret = ca_setauth(env, &sa, sa.sa_localauth.id_buf, PROC_IKEV2);
ibuf_free(sa.sa_localauth.id_buf);
sa.sa_localauth.id_buf = NULL;
ibuf_free(authmsg);
return (ret);
}
int
ca_reload(struct iked *env)
{
struct ca_store *store = env->sc_priv;
uint8_t md[EVP_MAX_MD_SIZE];
char file[PATH_MAX];
struct iovec iov[2];
struct dirent *entry;
STACK_OF(X509_OBJECT) *h;
X509_OBJECT *xo;
X509 *x509;
DIR *dir;
int i, iovcnt = 0;
unsigned int len;
X509_NAME *subj;
char *subj_name;
/*
* Load CAs
*/
if ((dir = opendir(IKED_CA_DIR)) == NULL)
return (-1);
while ((entry = readdir(dir)) != NULL) {
if ((entry->d_type != DT_REG) &&
(entry->d_type != DT_LNK))
continue;
if (snprintf(file, sizeof(file), "%s%s",
IKED_CA_DIR, entry->d_name) < 0)
continue;
if (!X509_load_cert_file(store->ca_calookup, file,
X509_FILETYPE_PEM)) {
log_warn("%s: failed to load ca file %s", __func__,
entry->d_name);
ca_sslerror(__func__);
continue;
}
log_debug("%s: loaded ca file %s", __func__, entry->d_name);
}
closedir(dir);
/*
* Load CRLs for the CAs
*/
if ((dir = opendir(IKED_CRL_DIR)) == NULL)
return (-1);
while ((entry = readdir(dir)) != NULL) {
if ((entry->d_type != DT_REG) &&
(entry->d_type != DT_LNK))
continue;
if (snprintf(file, sizeof(file), "%s%s",
IKED_CRL_DIR, entry->d_name) < 0)
continue;
if (!X509_load_crl_file(store->ca_calookup, file,
X509_FILETYPE_PEM)) {
log_warn("%s: failed to load crl file %s", __func__,
entry->d_name);
ca_sslerror(__func__);
continue;
}
/* Only enable CRL checks if we actually loaded a CRL */
X509_STORE_set_flags(store->ca_cas, X509_V_FLAG_CRL_CHECK);
log_debug("%s: loaded crl file %s", __func__, entry->d_name);
}
closedir(dir);
/*
* Save CAs signatures for the IKEv2 CERTREQ
*/
ibuf_free(env->sc_certreq);
if ((env->sc_certreq = ibuf_new(NULL, 0)) == NULL)
return (-1);
h = X509_STORE_get0_objects(store->ca_cas);
for (i = 0; i < sk_X509_OBJECT_num(h); i++) {
xo = sk_X509_OBJECT_value(h, i);
if (X509_OBJECT_get_type(xo) != X509_LU_X509)
continue;
x509 = X509_OBJECT_get0_X509(xo);
len = sizeof(md);
ca_subjectpubkey_digest(x509, md, &len);
subj = X509_get_subject_name(x509);
if (subj == NULL)
return (-1);
subj_name = X509_NAME_oneline(subj, NULL, 0);
if (subj_name == NULL)
return (-1);
log_debug("%s: %s", __func__, subj_name);
OPENSSL_free(subj_name);
if (ibuf_add(env->sc_certreq, md, len) != 0) {
ibuf_free(env->sc_certreq);
env->sc_certreq = NULL;
return (-1);
}
}
if (ibuf_size(env->sc_certreq)) {
env->sc_certreqtype = IKEV2_CERT_X509_CERT;
iov[0].iov_base = &env->sc_certreqtype;
iov[0].iov_len = sizeof(env->sc_certreqtype);
iovcnt++;
iov[1].iov_base = ibuf_data(env->sc_certreq);
iov[1].iov_len = ibuf_size(env->sc_certreq);
iovcnt++;
log_debug("%s: loaded %zu ca certificate%s", __func__,
ibuf_size(env->sc_certreq) / SHA_DIGEST_LENGTH,
ibuf_size(env->sc_certreq) == SHA_DIGEST_LENGTH ?
"" : "s");
(void)proc_composev(&env->sc_ps, PROC_IKEV2, IMSG_CERTREQ,
iov, iovcnt);
}
/*
* Load certificates
*/
if ((dir = opendir(IKED_CERT_DIR)) == NULL)
return (-1);
while ((entry = readdir(dir)) != NULL) {
if ((entry->d_type != DT_REG) &&
(entry->d_type != DT_LNK))
continue;
if (snprintf(file, sizeof(file), "%s%s",
IKED_CERT_DIR, entry->d_name) < 0)
continue;
if (!X509_load_cert_file(store->ca_certlookup, file,
X509_FILETYPE_PEM)) {
log_warn("%s: failed to load cert file %s", __func__,
entry->d_name);
ca_sslerror(__func__);
continue;
}
log_debug("%s: loaded cert file %s", __func__, entry->d_name);
}
closedir(dir);
h = X509_STORE_get0_objects(store->ca_certs);
for (i = 0; i < sk_X509_OBJECT_num(h); i++) {
xo = sk_X509_OBJECT_value(h, i);
if (X509_OBJECT_get_type(xo) != X509_LU_X509)
continue;
x509 = X509_OBJECT_get0_X509(xo);
(void)ca_validate_cert(env, NULL, x509, 0, NULL, NULL);
}
if (!env->sc_certreqtype)
env->sc_certreqtype = store->ca_pubkey.id_type;
log_debug("%s: local cert type %s", __func__,
print_map(env->sc_certreqtype, ikev2_cert_map));
iov[0].iov_base = &env->sc_certreqtype;
iov[0].iov_len = sizeof(env->sc_certreqtype);
if (iovcnt == 0)
iovcnt++;
(void)proc_composev(&env->sc_ps, PROC_IKEV2, IMSG_CERTREQ, iov, iovcnt);
return (0);
}
X509 *
ca_by_subjectpubkey(X509_STORE *ctx, uint8_t *sig, size_t siglen)
{
STACK_OF(X509_OBJECT) *h;
X509_OBJECT *xo;
X509 *ca;
int i;
unsigned int len;
uint8_t md[EVP_MAX_MD_SIZE];
h = X509_STORE_get0_objects(ctx);
for (i = 0; i < sk_X509_OBJECT_num(h); i++) {
xo = sk_X509_OBJECT_value(h, i);
if (X509_OBJECT_get_type(xo) != X509_LU_X509)
continue;
ca = X509_OBJECT_get0_X509(xo);
len = sizeof(md);
ca_subjectpubkey_digest(ca, md, &len);
if (len == siglen && memcmp(md, sig, len) == 0)
return (ca);
}
return (NULL);
}
X509 *
ca_by_issuer(X509_STORE *ctx, X509_NAME *subject, struct iked_static_id *id)
{
STACK_OF(X509_OBJECT) *h;
X509_OBJECT *xo;
X509 *cert;
int i;
X509_NAME *issuer;
if (subject == NULL)
return (NULL);
h = X509_STORE_get0_objects(ctx);
for (i = 0; i < sk_X509_OBJECT_num(h); i++) {
xo = sk_X509_OBJECT_value(h, i);
if (X509_OBJECT_get_type(xo) != X509_LU_X509)
continue;
cert = X509_OBJECT_get0_X509(xo);
if ((issuer = X509_get_issuer_name(cert)) == NULL)
continue;
else if (X509_NAME_cmp(subject, issuer) == 0) {
switch (id->id_type) {
case IKEV2_ID_ASN1_DN:
if (ca_x509_subject_cmp(cert, id) == 0)
return (cert);
break;
default:
if (ca_x509_subjectaltname_cmp(cert, id) == 0)
return (cert);
break;
}
}
}
return (NULL);
}
X509 *
ca_by_subjectaltname(X509_STORE *ctx, struct iked_static_id *id)
{
STACK_OF(X509_OBJECT) *h;
X509_OBJECT *xo;
X509 *cert;
int i;
h = X509_STORE_get0_objects(ctx);
for (i = 0; i < sk_X509_OBJECT_num(h); i++) {
xo = sk_X509_OBJECT_value(h, i);
if (X509_OBJECT_get_type(xo) != X509_LU_X509)
continue;
cert = X509_OBJECT_get0_X509(xo);
switch (id->id_type) {
case IKEV2_ID_ASN1_DN:
if (ca_x509_subject_cmp(cert, id) == 0)
return (cert);
break;
default:
if (ca_x509_subjectaltname_cmp(cert, id) == 0)
return (cert);
break;
}
}
return (NULL);
}
void
ca_store_certs_info(const char *msg, X509_STORE *ctx)
{
STACK_OF(X509_OBJECT) *h;
X509_OBJECT *xo;
X509 *cert;
int i;
h = X509_STORE_get0_objects(ctx);
for (i = 0; i < sk_X509_OBJECT_num(h); i++) {
xo = sk_X509_OBJECT_value(h, i);
if (X509_OBJECT_get_type(xo) != X509_LU_X509)
continue;
cert = X509_OBJECT_get0_X509(xo);
ca_cert_info(msg, cert);
}
}
int
ca_cert_local(struct iked *env, X509 *cert)
{
struct ca_store *store = env->sc_priv;
EVP_PKEY *certkey = NULL, *localpub = NULL;
int ret = 0;
if ((localpub = ca_bytes_to_pkey(ibuf_data(store->ca_pubkey.id_buf),
ibuf_size(store->ca_pubkey.id_buf))) == NULL)
goto done;
if ((certkey = X509_get0_pubkey(cert)) == NULL) {
log_info("%s: no public key in cert", __func__);
goto done;
}
if (EVP_PKEY_cmp(certkey, localpub) != 1) {
log_debug("%s: certificate key mismatch", __func__);
goto done;
}
ret = 1;
done:
EVP_PKEY_free(localpub);
return (ret);
}
void
ca_cert_info(const char *msg, X509 *cert)
{
ASN1_INTEGER *asn1_serial;
BUF_MEM *memptr;
BIO *rawserial = NULL;
char buf[BUFSIZ];
X509_NAME *name;
if ((asn1_serial = X509_get_serialNumber(cert)) == NULL ||
(rawserial = BIO_new(BIO_s_mem())) == NULL ||
i2a_ASN1_INTEGER(rawserial, asn1_serial) <= 0)
goto out;
name = X509_get_issuer_name(cert);
if (name != NULL &&
X509_NAME_oneline(name, buf, sizeof(buf)))
log_info("%s: issuer: %s", msg, buf);
BIO_get_mem_ptr(rawserial, &memptr);
if (memptr->data != NULL && memptr->length < INT32_MAX)
log_info("%s: serial: %.*s", msg, (int)memptr->length,
memptr->data);
name = X509_get_subject_name(cert);
if (name != NULL &&
X509_NAME_oneline(name, buf, sizeof(buf)))
log_info("%s: subject: %s", msg, buf);
ca_x509_subjectaltname_log(cert, msg);
out:
BIO_free(rawserial);
}
int
ca_subjectpubkey_digest(X509 *x509, uint8_t *md, unsigned int *size)
{
EVP_PKEY *pkey;
uint8_t *buf = NULL;
int buflen;
if (*size < SHA_DIGEST_LENGTH)
return (-1);
/*
* Generate a SHA-1 digest of the Subject Public Key Info
* element in the X.509 certificate, an ASN.1 sequence
* that includes the public key type (eg. RSA) and the
* public key value (see 3.7 of RFC7296).
*/
if ((pkey = X509_get0_pubkey(x509)) == NULL)
return (-1);
buflen = i2d_PUBKEY(pkey, &buf);
if (buflen == 0)
return (-1);
if (!EVP_Digest(buf, buflen, md, size, EVP_sha1(), NULL)) {
OPENSSL_free(buf);
return (-1);
}
OPENSSL_free(buf);
return (0);
}
void
ca_store_info(struct iked *env, struct imsg *imsg, const char *msg, X509_STORE *ctx)
{
STACK_OF(X509_OBJECT) *h;
X509_OBJECT *xo;
X509 *cert;
int i;
X509_NAME *subject;
char *name;
char *buf;
int buflen;
h = X509_STORE_get0_objects(ctx);
for (i = 0; i < sk_X509_OBJECT_num(h); i++) {
xo = sk_X509_OBJECT_value(h, i);
if (X509_OBJECT_get_type(xo) != X509_LU_X509)
continue;
cert = X509_OBJECT_get0_X509(xo);
if ((subject = X509_get_subject_name(cert)) == NULL ||
(name = X509_NAME_oneline(subject, NULL, 0)) == NULL)
continue;
buflen = asprintf(&buf, "%s: %s\n", msg, name);
OPENSSL_free(name);
if (buflen == -1)
continue;
proc_compose_imsg(&env->sc_ps, PROC_CONTROL, -1,
IMSG_CTL_SHOW_CERTSTORE, imsg->hdr.peerid,
-1, buf, buflen + 1);
free(buf);
}
}
struct ibuf *
ca_x509_serialize(X509 *x509)
{
long len;
struct ibuf *buf;
uint8_t *d = NULL;
BIO *out;
if ((out = BIO_new(BIO_s_mem())) == NULL)
return (NULL);
if (!i2d_X509_bio(out, x509)) {
BIO_free(out);
return (NULL);
}
len = BIO_get_mem_data(out, &d);
buf = ibuf_new(d, len);
BIO_free(out);
return (buf);
}
int
ca_pubkey_serialize(EVP_PKEY *key, struct iked_id *id)
{
RSA *rsa = NULL;
EC_KEY *ec = NULL;
uint8_t *d;
int len = 0;
int ret = -1;
switch (EVP_PKEY_id(key)) {
case EVP_PKEY_RSA:
id->id_type = 0;
id->id_offset = 0;
ibuf_free(id->id_buf);
id->id_buf = NULL;
if ((rsa = EVP_PKEY_get0_RSA(key)) == NULL)
goto done;
if ((len = i2d_RSAPublicKey(rsa, NULL)) <= 0)
goto done;
if ((id->id_buf = ibuf_new(NULL, len)) == NULL)
goto done;
d = ibuf_data(id->id_buf);
if (i2d_RSAPublicKey(rsa, &d) != len) {
ibuf_free(id->id_buf);
id->id_buf = NULL;
goto done;
}
id->id_type = IKEV2_CERT_RSA_KEY;
break;
case EVP_PKEY_EC:
id->id_type = 0;
id->id_offset = 0;
ibuf_free(id->id_buf);
id->id_buf = NULL;
if ((ec = EVP_PKEY_get0_EC_KEY(key)) == NULL)
goto done;
if ((len = i2d_EC_PUBKEY(ec, NULL)) <= 0)
goto done;
if ((id->id_buf = ibuf_new(NULL, len)) == NULL)
goto done;
d = ibuf_data(id->id_buf);
if (i2d_EC_PUBKEY(ec, &d) != len) {
ibuf_free(id->id_buf);
id->id_buf = NULL;
goto done;
}
id->id_type = IKEV2_CERT_ECDSA;
break;
default:
log_debug("%s: unsupported key type %d", __func__,
EVP_PKEY_id(key));
return (-1);
}
log_debug("%s: type %s length %d", __func__,
print_map(id->id_type, ikev2_cert_map), len);
ret = 0;
done:
return (ret);
}
int
ca_privkey_serialize(EVP_PKEY *key, struct iked_id *id)
{
RSA *rsa = NULL;
EC_KEY *ec = NULL;
uint8_t *d;
int len = 0;
int ret = -1;
switch (EVP_PKEY_id(key)) {
case EVP_PKEY_RSA:
id->id_type = 0;
id->id_offset = 0;
ibuf_free(id->id_buf);
id->id_buf = NULL;
if ((rsa = EVP_PKEY_get0_RSA(key)) == NULL)
goto done;
if ((len = i2d_RSAPrivateKey(rsa, NULL)) <= 0)
goto done;
if ((id->id_buf = ibuf_new(NULL, len)) == NULL)
goto done;
d = ibuf_data(id->id_buf);
if (i2d_RSAPrivateKey(rsa, &d) != len) {
ibuf_free(id->id_buf);
id->id_buf = NULL;
goto done;
}
id->id_type = IKEV2_CERT_RSA_KEY;
break;
case EVP_PKEY_EC:
id->id_type = 0;
id->id_offset = 0;
ibuf_free(id->id_buf);
id->id_buf = NULL;
if ((ec = EVP_PKEY_get0_EC_KEY(key)) == NULL)
goto done;
if ((len = i2d_ECPrivateKey(ec, NULL)) <= 0)
goto done;
if ((id->id_buf = ibuf_new(NULL, len)) == NULL)
goto done;
d = ibuf_data(id->id_buf);
if (i2d_ECPrivateKey(ec, &d) != len) {
ibuf_free(id->id_buf);
id->id_buf = NULL;
goto done;
}
id->id_type = IKEV2_CERT_ECDSA;
break;
default:
log_debug("%s: unsupported key type %d", __func__,
EVP_PKEY_id(key));
return (-1);
}
log_debug("%s: type %s length %d", __func__,
print_map(id->id_type, ikev2_cert_map), len);
ret = 0;
done:
return (ret);
}
EVP_PKEY *
ca_bytes_to_pkey(uint8_t *data, size_t len)
{
BIO *rawcert = NULL;
EVP_PKEY *localkey = NULL, *out = NULL;
RSA *localrsa = NULL;
EC_KEY *localec = NULL;
if ((rawcert = BIO_new_mem_buf(data, len)) == NULL)
goto done;
if ((localkey = EVP_PKEY_new()) == NULL)
goto sslerr;
if ((localrsa = d2i_RSAPublicKey_bio(rawcert, NULL))) {
if (EVP_PKEY_set1_RSA(localkey, localrsa) != 1)
goto sslerr;
} else if (BIO_reset(rawcert) == 1 &&
(localec = d2i_EC_PUBKEY_bio(rawcert, NULL))) {
if (EVP_PKEY_set1_EC_KEY(localkey, localec) != 1)
goto sslerr;
} else {
log_info("%s: unknown public key type", __func__);
goto done;
}
out = localkey;
localkey = NULL;
sslerr:
if (out == NULL)
ca_sslerror(__func__);
done:
EVP_PKEY_free(localkey);
RSA_free(localrsa);
EC_KEY_free(localec);
BIO_free(rawcert);
return (out);
}
int
ca_privkey_to_method(struct iked_id *privkey)
{
BIO *rawcert = NULL;
EC_KEY *ec = NULL;
const EC_GROUP *group = NULL;
uint8_t method = IKEV2_AUTH_NONE;
switch (privkey->id_type) {
case IKEV2_CERT_RSA_KEY:
method = IKEV2_AUTH_RSA_SIG;
break;
case IKEV2_CERT_ECDSA:
if ((rawcert = BIO_new_mem_buf(ibuf_data(privkey->id_buf),
ibuf_size(privkey->id_buf))) == NULL)
goto out;
if ((ec = d2i_ECPrivateKey_bio(rawcert, NULL)) == NULL)
goto out;
if ((group = EC_KEY_get0_group(ec)) == NULL)
goto out;
switch (EC_GROUP_get_degree(group)) {
case 256:
method = IKEV2_AUTH_ECDSA_256;
break;
case 384:
method = IKEV2_AUTH_ECDSA_384;
break;
case 521:
method = IKEV2_AUTH_ECDSA_521;
break;
}
}
log_debug("%s: type %s method %s", __func__,
print_map(privkey->id_type, ikev2_cert_map),
print_map(method, ikev2_auth_map));
out:
EC_KEY_free(ec);
BIO_free(rawcert);
return (method);
}
/*
* Return dynamically allocated buffer containing certificate name.
* The resulting buffer must be freed with OpenSSL_free().
*/
char *
ca_asn1_name(uint8_t *asn1, size_t len)
{
X509_NAME *name = NULL;
char *str = NULL;
const uint8_t *p;
p = asn1;
if ((name = d2i_X509_NAME(NULL, &p, len)) == NULL)
return (NULL);
str = X509_NAME_oneline(name, NULL, 0);
X509_NAME_free(name);
return (str);
}
/*
* Copy 'src' to 'dst' until 'marker' is found while unescaping '\'
* characters. The return value tells the caller where to continue
* parsing (might be the end of the string) or NULL on error.
*/
static char *
ca_x509_name_unescape(char *src, char *dst, char marker)
{
while (*src) {
if (*src == marker) {
src++;
break;
}
if (*src == '\\') {
src++;
if (!*src) {
log_warnx("%s: '\\' at end of string",
__func__);
*dst = '\0';
return (NULL);
}
}
*dst++ = *src++;
}
*dst = '\0';
return (src);
}
/*
* Parse an X509 subject name where 'subject' is in the format
* /type0=value0/type1=value1/type2=...
* where characters may be escaped by '\'.
* See lib/libssl/src/apps/apps.c:parse_name()
*/
void *
ca_x509_name_parse(char *subject)
{
char *cp, *value = NULL, *type = NULL;
size_t maxlen;
X509_NAME *name = NULL;
if (*subject != '/') {
log_warnx("%s: leading '/' missing in '%s'", __func__, subject);
goto err;
}
/* length of subject is upper bound for unescaped type/value */
maxlen = strlen(subject) + 1;
if ((type = calloc(1, maxlen)) == NULL ||
(value = calloc(1, maxlen)) == NULL ||
(name = X509_NAME_new()) == NULL)
goto err;
cp = subject + 1;
while (*cp) {
/* unescape type, terminated by '=' */
cp = ca_x509_name_unescape(cp, type, '=');
if (cp == NULL) {
log_warnx("%s: could not parse type", __func__);
goto err;
}
if (!*cp) {
log_warnx("%s: missing value", __func__);
goto err;
}
/* unescape value, terminated by '/' */
cp = ca_x509_name_unescape(cp, value, '/');
if (cp == NULL) {
log_warnx("%s: could not parse value", __func__);
goto err;
}
if (!*type || !*value) {
log_warnx("%s: empty type or value", __func__);
goto err;
}
log_debug("%s: setting '%s' to '%s'", __func__, type, value);
if (!X509_NAME_add_entry_by_txt(name, type, MBSTRING_ASC,
value, -1, -1, 0)) {
log_warnx("%s: setting '%s' to '%s' failed", __func__,
type, value);
ca_sslerror(__func__);
goto err;
}
}
free(type);
free(value);
return (name);
err:
X509_NAME_free(name);
free(type);
free(value);
return (NULL);
}
int
ca_validate_pubkey(struct iked *env, struct iked_static_id *id,
void *data, size_t len, struct iked_id *out)
{
RSA *localrsa = NULL;
EVP_PKEY *peerkey = NULL, *localkey = NULL;
int ret = -1;
FILE *fp = NULL;
char idstr[IKED_ID_SIZE];
char file[PATH_MAX];
struct iked_id idp;
switch (id->id_type) {
case IKEV2_ID_IPV4:
case IKEV2_ID_FQDN:
case IKEV2_ID_UFQDN:
case IKEV2_ID_IPV6:
break;
default:
/* Some types like ASN1_DN will not be mapped to file names */
log_debug("%s: unsupported public key type %s",
__func__, print_map(id->id_type, ikev2_id_map));
return (-1);
}
bzero(&idp, sizeof(idp));
if ((idp.id_buf = ibuf_new(id->id_data, id->id_length)) == NULL)
goto done;
idp.id_type = id->id_type;
idp.id_offset = id->id_offset;
if (ikev2_print_id(&idp, idstr, sizeof(idstr)) == -1)
goto done;
if (len == 0 && data) {
/* Data is already an public key */
peerkey = (EVP_PKEY *)data;
}
if (len > 0) {
if ((peerkey = ca_bytes_to_pkey(data, len)) == NULL)
goto done;
}
lc_idtype(idstr);
if (strlcpy(file, IKED_PUBKEY_DIR, sizeof(file)) >= sizeof(file) ||
strlcat(file, idstr, sizeof(file)) >= sizeof(file)) {
log_debug("%s: public key id too long %s", __func__, idstr);
goto done;
}
if ((fp = fopen(file, "r")) == NULL) {
/* Log to debug when called from ca_validate_cert */
logit(len == 0 ? LOG_DEBUG : LOG_INFO,
"%s: could not open public key %s", __func__, file);
goto done;
}
localkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL);
if (localkey == NULL) {
/* reading PKCS #8 failed, try PEM RSA */
rewind(fp);
localrsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL);
fclose(fp);
if (localrsa == NULL)
goto sslerr;
if ((localkey = EVP_PKEY_new()) == NULL)
goto sslerr;
if (!EVP_PKEY_set1_RSA(localkey, localrsa))
goto sslerr;
} else {
fclose(fp);
}
if (localkey == NULL)
goto sslerr;
if (peerkey && EVP_PKEY_cmp(peerkey, localkey) != 1) {
log_debug("%s: public key does not match %s", __func__, file);
goto done;
}
log_debug("%s: valid public key in file %s", __func__, file);
if (out && ca_pubkey_serialize(localkey, out))
goto done;
ret = 0;
sslerr:
if (ret != 0)
ca_sslerror(__func__);
done:
ibuf_free(idp.id_buf);
EVP_PKEY_free(localkey);
RSA_free(localrsa);
if (len > 0)
EVP_PKEY_free(peerkey);
return (ret);
}
int
ca_validate_cert(struct iked *env, struct iked_static_id *id,
void *data, size_t len, STACK_OF(X509) *untrusted, X509 **issuerp)
{
struct ca_store *store = env->sc_priv;
X509_STORE_CTX *csc = NULL;
X509_VERIFY_PARAM *param;
BIO *rawcert = NULL;
X509 *cert = NULL;
EVP_PKEY *pkey;
int ret = -1, result, error;
const char *errstr = "failed";
X509_NAME *subj;
char *subj_name;
if (issuerp)
*issuerp = NULL;
if (len == 0) {
/* Data is already an X509 certificate */
cert = (X509 *)data;
} else {
/* Convert data to X509 certificate */
if ((rawcert = BIO_new_mem_buf(data, len)) == NULL)
goto done;
if ((cert = d2i_X509_bio(rawcert, NULL)) == NULL)
goto done;
}
/* Certificate needs a valid subjectName */
if (X509_get_subject_name(cert) == NULL) {
errstr = "invalid subject";
goto done;
}
if (id != NULL) {
if ((pkey = X509_get0_pubkey(cert)) == NULL) {
errstr = "no public key in cert";
goto done;
}
ret = ca_validate_pubkey(env, id, pkey, 0, NULL);
if (ret == 0) {
errstr = "in public key file, ok";
goto done;
}
switch (id->id_type) {
case IKEV2_ID_ASN1_DN:
if (ca_x509_subject_cmp(cert, id) < 0) {
errstr = "ASN1_DN identifier mismatch";
goto done;
}
break;
default:
if (ca_x509_subjectaltname_cmp(cert, id) != 0) {
errstr = "invalid subjectAltName extension";
goto done;
}
break;
}
}
csc = X509_STORE_CTX_new();
if (csc == NULL) {
errstr = "failed to alloc csc";
goto done;
}
X509_STORE_CTX_init(csc, store->ca_cas, cert, untrusted);
param = X509_STORE_get0_param(store->ca_cas);
if (X509_VERIFY_PARAM_get_flags(param) & X509_V_FLAG_CRL_CHECK) {
X509_STORE_CTX_set_flags(csc, X509_V_FLAG_CRL_CHECK);
X509_STORE_CTX_set_flags(csc, X509_V_FLAG_CRL_CHECK_ALL);
}
if (env->sc_cert_partial_chain)
X509_STORE_CTX_set_flags(csc, X509_V_FLAG_PARTIAL_CHAIN);
result = X509_verify_cert(csc);
error = X509_STORE_CTX_get_error(csc);
if (error == 0 && issuerp) {
if (X509_STORE_CTX_get1_issuer(issuerp, csc, cert) != 1) {
log_debug("%s: cannot get issuer", __func__);
*issuerp = NULL;
}
}
X509_STORE_CTX_cleanup(csc);
if (error != 0) {
errstr = X509_verify_cert_error_string(error);
goto done;
}
if (!result) {
/* XXX should we accept self-signed certificates? */
errstr = "rejecting self-signed certificate";
goto done;
}
/* Success */
ret = 0;
errstr = "ok";
done:
if (cert != NULL) {
subj = X509_get_subject_name(cert);
if (subj == NULL)
goto err;
subj_name = X509_NAME_oneline(subj, NULL, 0);
if (subj_name == NULL)
goto err;
log_debug("%s: %s %.100s", __func__, subj_name, errstr);
OPENSSL_free(subj_name);
}
err:
if (len > 0)
X509_free(cert);
BIO_free(rawcert);
X509_STORE_CTX_free(csc);
return (ret);
}
/* check if subject from cert matches the id */
int
ca_x509_subject_cmp(X509 *cert, struct iked_static_id *id)
{
X509_NAME *subject, *idname = NULL;
const uint8_t *idptr;
size_t idlen;
int ret = -1;
if (id->id_type != IKEV2_ID_ASN1_DN)
return (-1);
if ((subject = X509_get_subject_name(cert)) == NULL)
return (-1);
if (id->id_length <= id->id_offset)
return (-1);
idlen = id->id_length - id->id_offset;
idptr = id->id_data + id->id_offset;
if ((idname = d2i_X509_NAME(NULL, &idptr, idlen)) == NULL)
return (-1);
if (X509_NAME_cmp(subject, idname) == 0)
ret = 0;
X509_NAME_free(idname);
return (ret);
}
#define MODE_ALT_LOG 1
#define MODE_ALT_GET 2
#define MODE_ALT_CMP 3
int
ca_x509_subjectaltname_do(X509 *cert, int mode, const char *logmsg,
struct iked_static_id *id, struct iked_id *retid)
{
STACK_OF(GENERAL_NAME) *stack = NULL;
GENERAL_NAME *entry;
ASN1_STRING *cstr;
char idstr[IKED_ID_SIZE];
int idx, ret, i, type, len;
const uint8_t *data;
ret = -1;
idx = -1;
while ((stack = X509_get_ext_d2i(cert, NID_subject_alt_name,
NULL, &idx)) != NULL) {
for (i = 0; i < sk_GENERAL_NAME_num(stack); i++) {
entry = sk_GENERAL_NAME_value(stack, i);
switch (entry->type) {
case GEN_DNS:
cstr = entry->d.dNSName;
if (ASN1_STRING_type(cstr) != V_ASN1_IA5STRING)
continue;
type = IKEV2_ID_FQDN;
break;
case GEN_EMAIL:
cstr = entry->d.rfc822Name;
if (ASN1_STRING_type(cstr) != V_ASN1_IA5STRING)
continue;
type = IKEV2_ID_UFQDN;
break;
case GEN_IPADD:
cstr = entry->d.iPAddress;
switch (ASN1_STRING_length(cstr)) {
case 4:
type = IKEV2_ID_IPV4;
break;
case 16:
type = IKEV2_ID_IPV6;
break;
default:
log_debug("%s: invalid subjectAltName"
" IP address", __func__);
continue;
}
break;
default:
continue;
}
len = ASN1_STRING_length(cstr);
data = ASN1_STRING_get0_data(cstr);
if (mode == MODE_ALT_LOG) {
struct iked_id sanid;
bzero(&sanid, sizeof(sanid));
sanid.id_offset = 0;
sanid.id_type = type;
if ((sanid.id_buf = ibuf_new(data, len))
== NULL) {
log_debug("%s: failed to get id buffer",
__func__);
continue;
}
ikev2_print_id(&sanid, idstr, sizeof(idstr));
log_info("%s: altname: %s", logmsg, idstr);
ibuf_free(sanid.id_buf);
sanid.id_buf = NULL;
}
/* Compare length and data */
if (mode == MODE_ALT_CMP) {
if (type == id->id_type &&
(len == (id->id_length - id->id_offset)) &&
(memcmp(id->id_data + id->id_offset,
data, len)) == 0) {
ret = 0;
break;
}
}
/* Get first ID */
if (mode == MODE_ALT_GET) {
ibuf_free(retid->id_buf);
if ((retid->id_buf = ibuf_new(data, len)) == NULL) {
log_debug("%s: failed to get id buffer",
__func__);
ret = -2;
break;
}
retid->id_offset = 0;
ikev2_print_id(retid, idstr, sizeof(idstr));
log_debug("%s: %s", __func__, idstr);
ret = 0;
break;
}
}
sk_GENERAL_NAME_pop_free(stack, GENERAL_NAME_free);
if (ret != -1)
break;
}
if (idx == -1)
log_debug("%s: did not find subjectAltName in certificate",
__func__);
return ret;
}
int
ca_x509_subjectaltname_log(X509 *cert, const char *logmsg)
{
return ca_x509_subjectaltname_do(cert, MODE_ALT_LOG, logmsg, NULL, NULL);
}
int
ca_x509_subjectaltname_cmp(X509 *cert, struct iked_static_id *id)
{
return ca_x509_subjectaltname_do(cert, MODE_ALT_CMP, NULL, id, NULL);
}
int
ca_x509_subjectaltname_get(X509 *cert, struct iked_id *retid)
{
return ca_x509_subjectaltname_do(cert, MODE_ALT_GET, NULL, NULL, retid);
}
void
ca_sslerror(const char *caller)
{
unsigned long error;
while ((error = ERR_get_error()) != 0)
log_warnx("%s: %s: %.100s", __func__, caller,
ERR_error_string(error, NULL));
}
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