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openldap/servers/slapd/overlays/autoca.c
Quanah Gibson-Mount 58c978825c Issue#9020 - Use consistent namespaces for overlays
2020-06-22 20:44:12 +00:00

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/* autoca.c - Automatic Certificate Authority */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2009-2020 The OpenLDAP Foundation.
* Copyright 2009-2018 by Howard Chu.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
/* ACKNOWLEDGEMENTS:
* This work was initially developed by Howard Chu for inclusion in
* OpenLDAP Software.
*/
#include "portable.h"
#ifdef SLAPD_OVER_AUTOCA
#include <stdio.h>
#include <ac/string.h>
#include <ac/socket.h>
#include "lutil.h"
#include "slap.h"
#include "config.h"
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/evp.h>
#include <openssl/bn.h>
/* Starting with OpenSSL 1.1.0, rsa.h is no longer included in
* x509.h, so we need to explicitly include it for the
* call to EVP_PKEY_CTX_set_rsa_keygen_bits
*/
#if OPENSSL_VERSION_NUMBER >= 0x10100000
#include <openssl/rsa.h>
#define X509_get_notBefore(x) X509_getm_notBefore(x)
#define X509_get_notAfter(x) X509_getm_notAfter(x)
#endif
/* This overlay implements a certificate authority that can generate
* certificates automatically for any entry in the directory.
* On startup it generates a self-signed CA cert for the directory's
* suffix entry and uses this to sign all other certs that it generates.
* User and server certs are generated on demand, using a Search request.
*/
#define LBER_TAG_OID ((ber_tag_t) 0x06UL)
#define LBER_TAG_UTF8 ((ber_tag_t) 0x0cUL)
#define KEYBITS 2048
#define MIN_KEYBITS 512
#define ACA_SCHEMA_ROOT "1.3.6.1.4.1.4203.666.11.11"
#define ACA_SCHEMA_AT ACA_SCHEMA_ROOT ".1"
#define ACA_SCHEMA_OC ACA_SCHEMA_ROOT ".2"
static AttributeDescription *ad_caCert, *ad_caPkey, *ad_usrCert, *ad_usrPkey;
static AttributeDescription *ad_mail, *ad_ipaddr;
static ObjectClass *oc_caObj, *oc_usrObj;
static char *aca_attrs[] = {
"( " ACA_SCHEMA_AT ".1 NAME 'cAPrivateKey' "
"DESC 'X.509 CA private key, use ;binary' "
"SUP pKCS8PrivateKey )",
"( " ACA_SCHEMA_AT ".2 NAME 'userPrivateKey' "
"DESC 'X.509 user private key, use ;binary' "
"SUP pKCS8PrivateKey )",
NULL
};
static struct {
char *at;
AttributeDescription **ad;
} aca_attr2[] = {
{ "cACertificate;binary", &ad_caCert },
{ "cAPrivateKey;binary", &ad_caPkey },
{ "userCertificate;binary", &ad_usrCert },
{ "userPrivateKey;binary", &ad_usrPkey },
{ "mail", &ad_mail },
{ NULL }
};
static struct {
char *ot;
ObjectClass **oc;
} aca_ocs[] = {
{ "( " ACA_SCHEMA_OC ".1 NAME 'autoCA' "
"DESC 'Automated PKI certificate authority' "
"SUP pkiCA AUXILIARY "
"MAY cAPrivateKey )", &oc_caObj },
{ "( " ACA_SCHEMA_OC ".2 NAME 'autoCAuser' "
"DESC 'Automated PKI CA user' "
"SUP pkiUser AUXILIARY "
"MAY userPrivateKey )", &oc_usrObj },
{ NULL }
};
typedef struct autoca_info {
X509 *ai_cert;
EVP_PKEY *ai_pkey;
ObjectClass *ai_usrclass;
ObjectClass *ai_srvclass;
struct berval ai_localdn;
struct berval ai_localndn;
int ai_usrkeybits;
int ai_srvkeybits;
int ai_cakeybits;
int ai_usrdays;
int ai_srvdays;
int ai_cadays;
} autoca_info;
/* Rewrite an LDAP DN in DER form
* Input must be valid DN, therefore no error checking is done here.
*/
static int autoca_dnbv2der( Operation *op, struct berval *bv, struct berval *der )
{
BerElementBuffer berbuf;
BerElement *ber = (BerElement *)&berbuf;
LDAPDN dn;
LDAPRDN rdn;
LDAPAVA *ava;
AttributeDescription *ad;
int irdn, iava;
ldap_bv2dn_x( bv, &dn, LDAP_DN_FORMAT_LDAP, op->o_tmpmemctx );
ber_init2( ber, NULL, LBER_USE_DER );
ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
/* count RDNs, we need them in reverse order */
for (irdn = 0; dn[irdn]; irdn++);
irdn--;
/* DN is a SEQuence of RDNs */
ber_start_seq( ber, LBER_SEQUENCE );
for (; irdn >=0; irdn--)
{
/* RDN is a SET of AVAs */
ber_start_set( ber, LBER_SET );
rdn = dn[irdn];
for (iava = 0; rdn[iava]; iava++)
{
const char *text;
char oid[1024];
struct berval bvo = { sizeof(oid), oid };
struct berval bva;
/* AVA is a SEQuence of attr and value */
ber_start_seq( ber, LBER_SEQUENCE );
ava = rdn[iava];
ad = NULL;
slap_bv2ad( &ava->la_attr, &ad, &text );
ber_str2bv( ad->ad_type->sat_oid, 0, 0, &bva );
ber_encode_oid( &bva, &bvo );
ber_put_berval( ber, &bvo, LBER_TAG_OID );
ber_put_berval( ber, &ava->la_value, LBER_TAG_UTF8 );
ber_put_seq( ber );
}
ber_put_set( ber );
}
ber_put_seq( ber );
ber_flatten2( ber, der, 0 );
ldap_dnfree_x( dn, op->o_tmpmemctx );
return 0;
}
static int autoca_genpkey(int bits, EVP_PKEY **pkey)
{
EVP_PKEY_CTX *kctx;
int rc;
kctx = EVP_PKEY_CTX_new_id(EVP_PKEY_RSA, NULL);
if (kctx == NULL)
return -1;
if (EVP_PKEY_keygen_init(kctx) <= 0)
{
EVP_PKEY_CTX_free(kctx);
return -1;
}
if (EVP_PKEY_CTX_set_rsa_keygen_bits(kctx, bits) <= 0)
{
EVP_PKEY_CTX_free(kctx);
return -1;
}
rc = EVP_PKEY_keygen(kctx, pkey);
EVP_PKEY_CTX_free(kctx);
return rc;
}
static int autoca_signcert(X509 *cert, EVP_PKEY *pkey)
{
EVP_MD_CTX *ctx = EVP_MD_CTX_create();
EVP_PKEY_CTX *pkctx = NULL;
int rc = -1;
if ( ctx == NULL )
return -1;
if (EVP_DigestSignInit(ctx, &pkctx, NULL, NULL, pkey))
{
rc = X509_sign_ctx(cert, ctx);
}
EVP_MD_CTX_destroy(ctx);
return rc;
}
#define SERIAL_BITS 64 /* should be less than 160 */
typedef struct myext {
char *name;
char *value;
} myext;
static myext CAexts[] = {
{ "subjectKeyIdentifier", "hash" },
{ "authorityKeyIdentifier", "keyid:always,issuer" },
{ "basicConstraints", "critical,CA:true" },
{ "keyUsage", "digitalSignature,cRLSign,keyCertSign" },
{ "nsComment", "OpenLDAP automatic certificate" },
{ NULL }
};
static myext usrExts[] = {
{ "subjectKeyIdentifier", "hash" },
{ "authorityKeyIdentifier", "keyid:always,issuer" },
{ "basicConstraints", "CA:false" },
{ "keyUsage", "digitalSignature,nonRepudiation,keyEncipherment" },
{ "extendedKeyUsage", "clientAuth,emailProtection,codeSigning" },
{ "nsComment", "OpenLDAP automatic certificate" },
{ NULL }
};
static myext srvExts[] = {
{ "subjectKeyIdentifier", "hash" },
{ "authorityKeyIdentifier", "keyid:always,issuer" },
{ "basicConstraints", "CA:false" },
{ "keyUsage", "digitalSignature,keyEncipherment" },
{ "extendedKeyUsage", "serverAuth,clientAuth" },
{ "nsComment", "OpenLDAP automatic certificate" },
{ NULL }
};
typedef struct genargs {
X509 *issuer_cert;
EVP_PKEY *issuer_pkey;
struct berval *subjectDN;
myext *cert_exts;
myext *more_exts;
X509 *newcert;
EVP_PKEY *newpkey;
struct berval dercert;
struct berval derpkey;
int keybits;
int days;
} genargs;
static int autoca_gencert( Operation *op, genargs *args )
{
X509_NAME *subj_name, *issuer_name;
X509 *subj_cert;
struct berval derdn;
unsigned char *pp;
EVP_PKEY *evpk = NULL;
int rc;
if ((subj_cert = X509_new()) == NULL)
return -1;
autoca_dnbv2der( op, args->subjectDN, &derdn );
pp = (unsigned char *)derdn.bv_val;
subj_name = d2i_X509_NAME( NULL, (const unsigned char **)&pp, derdn.bv_len );
op->o_tmpfree( derdn.bv_val, op->o_tmpmemctx );
if ( subj_name == NULL )
{
fail1:
X509_free( subj_cert );
return -1;
}
rc = autoca_genpkey( args->keybits, &evpk );
if ( rc <= 0 )
{
fail2:
if ( subj_name ) X509_NAME_free( subj_name );
goto fail1;
}
/* encode DER in PKCS#8 */
{
PKCS8_PRIV_KEY_INFO *p8inf;
if (( p8inf = EVP_PKEY2PKCS8( evpk )) == NULL )
goto fail2;
args->derpkey.bv_len = i2d_PKCS8_PRIV_KEY_INFO( p8inf, NULL );
args->derpkey.bv_val = op->o_tmpalloc( args->derpkey.bv_len, op->o_tmpmemctx );
pp = (unsigned char *)args->derpkey.bv_val;
i2d_PKCS8_PRIV_KEY_INFO( p8inf, &pp );
PKCS8_PRIV_KEY_INFO_free( p8inf );
}
args->newpkey = evpk;
/* set random serial */
{
BIGNUM *bn = BN_new();
if ( bn == NULL )
{
fail3:
EVP_PKEY_free( evpk );
goto fail2;
}
if (!BN_pseudo_rand(bn, SERIAL_BITS, 0, 0))
{
BN_free( bn );
goto fail3;
}
if (!BN_to_ASN1_INTEGER(bn, X509_get_serialNumber(subj_cert)))
{
BN_free( bn );
goto fail3;
}
BN_free(bn);
}
if (args->issuer_cert) {
issuer_name = X509_get_subject_name(args->issuer_cert);
} else {
issuer_name = subj_name;
args->issuer_cert = subj_cert;
args->issuer_pkey = evpk;
}
if (!X509_set_version(subj_cert, 2) || /* set version to V3 */
!X509_set_issuer_name(subj_cert, issuer_name) ||
!X509_set_subject_name(subj_cert, subj_name) ||
!X509_gmtime_adj(X509_get_notBefore(subj_cert), 0) ||
!X509_time_adj_ex(X509_get_notAfter(subj_cert), args->days, 0, NULL) ||
!X509_set_pubkey(subj_cert, evpk))
{
goto fail3;
}
X509_NAME_free(subj_name);
subj_name = NULL;
/* set cert extensions */
{
X509V3_CTX ctx;
X509_EXTENSION *ext;
int i;
X509V3_set_ctx(&ctx, args->issuer_cert, subj_cert, NULL, NULL, 0);
for (i=0; args->cert_exts[i].name; i++) {
ext = X509V3_EXT_nconf(NULL, &ctx, args->cert_exts[i].name, args->cert_exts[i].value);
if ( ext == NULL )
goto fail3;
rc = X509_add_ext(subj_cert, ext, -1);
X509_EXTENSION_free(ext);
if ( !rc )
goto fail3;
}
if (args->more_exts) {
for (i=0; args->more_exts[i].name; i++) {
ext = X509V3_EXT_nconf(NULL, &ctx, args->more_exts[i].name, args->more_exts[i].value);
if ( ext == NULL )
goto fail3;
rc = X509_add_ext(subj_cert, ext, -1);
X509_EXTENSION_free(ext);
if ( !rc )
goto fail3;
}
}
}
rc = autoca_signcert( subj_cert, args->issuer_pkey );
if ( rc < 0 )
goto fail3;
args->dercert.bv_len = i2d_X509( subj_cert, NULL );
args->dercert.bv_val = op->o_tmpalloc( args->dercert.bv_len, op->o_tmpmemctx );
pp = (unsigned char *)args->dercert.bv_val;
i2d_X509( subj_cert, &pp );
args->newcert = subj_cert;
return 0;
}
typedef struct saveargs {
ObjectClass *oc;
struct berval *dercert;
struct berval *derpkey;
slap_overinst *on;
struct berval *dn;
struct berval *ndn;
int isca;
} saveargs;
static int autoca_savecert( Operation *op, saveargs *args )
{
Modifications mod[3], *mp = mod;
struct berval bvs[6], *bp = bvs;
BackendInfo *bi;
slap_callback cb = {0};
SlapReply rs = {REP_RESULT};
if ( args->oc ) {
mp->sml_numvals = 1;
mp->sml_values = bp;
mp->sml_nvalues = NULL;
mp->sml_desc = slap_schema.si_ad_objectClass;
mp->sml_op = LDAP_MOD_ADD;
mp->sml_flags = SLAP_MOD_INTERNAL;
*bp++ = args->oc->soc_cname;
BER_BVZERO( bp );
bp++;
mp->sml_next = mp+1;
mp++;
}
mp->sml_numvals = 1;
mp->sml_values = bp;
mp->sml_nvalues = NULL;
mp->sml_desc = args->isca ? ad_caCert : ad_usrCert;
mp->sml_op = LDAP_MOD_REPLACE;
mp->sml_flags = SLAP_MOD_INTERNAL;
*bp++ = *args->dercert;
BER_BVZERO( bp );
bp++;
mp->sml_next = mp+1;
mp++;
mp->sml_numvals = 1;
mp->sml_values = bp;
mp->sml_nvalues = NULL;
mp->sml_desc = args->isca ? ad_caPkey : ad_usrPkey;
mp->sml_op = LDAP_MOD_ADD;
mp->sml_flags = SLAP_MOD_INTERNAL;
*bp++ = *args->derpkey;
BER_BVZERO( bp );
mp->sml_next = NULL;
cb.sc_response = slap_null_cb;
bi = op->o_bd->bd_info;
op->o_bd->bd_info = args->on->on_info->oi_orig;
op->o_tag = LDAP_REQ_MODIFY;
op->o_callback = &cb;
op->orm_modlist = mod;
op->orm_no_opattrs = 1;
op->o_req_dn = *args->dn;
op->o_req_ndn = *args->ndn;
op->o_bd->be_modify( op, &rs );
op->o_bd->bd_info = bi;
return rs.sr_err;
}
static const struct berval configDN = BER_BVC("cn=config");
/* must run as a pool thread to avoid cn=config deadlock */
static void *
autoca_setca_task( void *ctx, void *arg )
{
Connection conn = { 0 };
OperationBuffer opbuf;
Operation *op;
struct berval *cacert = arg;
Modifications mod;
struct berval bvs[2];
slap_callback cb = {0};
SlapReply rs = {REP_RESULT};
const char *text;
connection_fake_init( &conn, &opbuf, ctx );
op = &opbuf.ob_op;
mod.sml_numvals = 1;
mod.sml_values = bvs;
mod.sml_nvalues = NULL;
mod.sml_desc = NULL;
if ( slap_str2ad( "olcTLSCACertificate;binary", &mod.sml_desc, &text ))
goto leave;
mod.sml_op = LDAP_MOD_REPLACE;
mod.sml_flags = SLAP_MOD_INTERNAL;
bvs[0] = *cacert;
BER_BVZERO( &bvs[1] );
mod.sml_next = NULL;
cb.sc_response = slap_null_cb;
op->o_bd = select_backend( (struct berval *)&configDN, 0 );
if ( !op->o_bd )
goto leave;
op->o_tag = LDAP_REQ_MODIFY;
op->o_callback = &cb;
op->orm_modlist = &mod;
op->orm_no_opattrs = 1;
op->o_req_dn = configDN;
op->o_req_ndn = configDN;
op->o_dn = op->o_bd->be_rootdn;
op->o_ndn = op->o_bd->be_rootndn;
op->o_bd->be_modify( op, &rs );
leave:
ch_free( arg );
return NULL;
}
static int
autoca_setca( struct berval *cacert )
{
struct berval *bv = ch_malloc( sizeof(struct berval) + cacert->bv_len );
bv->bv_len = cacert->bv_len;
bv->bv_val = (char *)(bv+1);
AC_MEMCPY( bv->bv_val, cacert->bv_val, bv->bv_len );
return ldap_pvt_thread_pool_submit( &connection_pool, autoca_setca_task, bv );
}
static int
autoca_setlocal( Operation *op, struct berval *cert, struct berval *pkey )
{
Modifications mod[2];
struct berval bvs[4];
slap_callback cb = {0};
SlapReply rs = {REP_RESULT};
const char *text;
mod[0].sml_numvals = 1;
mod[0].sml_values = bvs;
mod[0].sml_nvalues = NULL;
mod[0].sml_desc = NULL;
if ( slap_str2ad( "olcTLSCertificate;binary", &mod[0].sml_desc, &text ))
return -1;
mod[0].sml_op = LDAP_MOD_REPLACE;
mod[0].sml_flags = SLAP_MOD_INTERNAL;
bvs[0] = *cert;
BER_BVZERO( &bvs[1] );
mod[0].sml_next = &mod[1];
mod[1].sml_numvals = 1;
mod[1].sml_values = &bvs[2];
mod[1].sml_nvalues = NULL;
mod[1].sml_desc = NULL;
if ( slap_str2ad( "olcTLSCertificateKey;binary", &mod[1].sml_desc, &text ))
return -1;
mod[1].sml_op = LDAP_MOD_REPLACE;
mod[1].sml_flags = SLAP_MOD_INTERNAL;
bvs[2] = *pkey;
BER_BVZERO( &bvs[3] );
mod[1].sml_next = NULL;
cb.sc_response = slap_null_cb;
op->o_bd = select_backend( (struct berval *)&configDN, 0 );
if ( !op->o_bd )
return -1;
op->o_tag = LDAP_REQ_MODIFY;
op->o_callback = &cb;
op->orm_modlist = mod;
op->orm_no_opattrs = 1;
op->o_req_dn = configDN;
op->o_req_ndn = configDN;
op->o_dn = op->o_bd->be_rootdn;
op->o_ndn = op->o_bd->be_rootndn;
op->o_bd->be_modify( op, &rs );
return rs.sr_err;
}
enum {
ACA_USRCLASS = 1,
ACA_SRVCLASS,
ACA_USRKEYBITS,
ACA_SRVKEYBITS,
ACA_CAKEYBITS,
ACA_USRDAYS,
ACA_SRVDAYS,
ACA_CADAYS,
ACA_LOCALDN
};
static int autoca_cf( ConfigArgs *c )
{
slap_overinst *on = (slap_overinst *)c->bi;
autoca_info *ai = on->on_bi.bi_private;
int rc = 0;
switch( c->op ) {
case SLAP_CONFIG_EMIT:
switch( c->type ) {
case ACA_USRCLASS:
if ( ai->ai_usrclass ) {
c->value_string = ch_strdup( ai->ai_usrclass->soc_cname.bv_val );
} else {
rc = 1;
}
break;
case ACA_SRVCLASS:
if ( ai->ai_srvclass ) {
c->value_string = ch_strdup( ai->ai_srvclass->soc_cname.bv_val );
} else {
rc = 1;
}
break;
case ACA_USRKEYBITS:
c->value_int = ai->ai_usrkeybits;
break;
case ACA_SRVKEYBITS:
c->value_int = ai->ai_srvkeybits;
break;
case ACA_CAKEYBITS:
c->value_int = ai->ai_cakeybits;
break;
case ACA_USRDAYS:
c->value_int = ai->ai_usrdays;
break;
case ACA_SRVDAYS:
c->value_int = ai->ai_srvdays;
break;
case ACA_CADAYS:
c->value_int = ai->ai_cadays;
break;
case ACA_LOCALDN:
if ( !BER_BVISNULL( &ai->ai_localdn )) {
rc = value_add_one( &c->rvalue_vals, &ai->ai_localdn );
} else {
rc = 1;
}
break;
}
break;
case LDAP_MOD_DELETE:
switch( c->type ) {
case ACA_USRCLASS:
ai->ai_usrclass = NULL;
break;
case ACA_SRVCLASS:
ai->ai_srvclass = NULL;
break;
case ACA_LOCALDN:
if ( ai->ai_localdn.bv_val ) {
ch_free( ai->ai_localdn.bv_val );
ch_free( ai->ai_localndn.bv_val );
BER_BVZERO( &ai->ai_localdn );
BER_BVZERO( &ai->ai_localndn );
}
break;
/* single-valued attrs, all no-ops */
}
break;
case SLAP_CONFIG_ADD:
case LDAP_MOD_ADD:
switch( c->type ) {
case ACA_USRCLASS:
{
ObjectClass *oc = oc_find( c->value_string );
if ( oc )
ai->ai_usrclass = oc;
else
rc = 1;
}
break;
case ACA_SRVCLASS:
{
ObjectClass *oc = oc_find( c->value_string );
if ( oc )
ai->ai_srvclass = oc;
else
rc = 1;
}
case ACA_USRKEYBITS:
if ( c->value_int < MIN_KEYBITS )
rc = 1;
else
ai->ai_usrkeybits = c->value_int;
break;
case ACA_SRVKEYBITS:
if ( c->value_int < MIN_KEYBITS )
rc = 1;
else
ai->ai_srvkeybits = c->value_int;
break;
case ACA_CAKEYBITS:
if ( c->value_int < MIN_KEYBITS )
rc = 1;
else
ai->ai_cakeybits = c->value_int;
break;
case ACA_USRDAYS:
ai->ai_usrdays = c->value_int;
break;
case ACA_SRVDAYS:
ai->ai_srvdays = c->value_int;
break;
case ACA_CADAYS:
ai->ai_cadays = c->value_int;
break;
case ACA_LOCALDN:
if ( c->be->be_nsuffix == NULL ) {
snprintf( c->cr_msg, sizeof( c->cr_msg ),
"suffix must be set" );
Debug( LDAP_DEBUG_CONFIG, "autoca_config: %s\n",
c->cr_msg );
rc = ARG_BAD_CONF;
break;
}
if ( !dnIsSuffix( &c->value_ndn, c->be->be_nsuffix )) {
snprintf( c->cr_msg, sizeof( c->cr_msg ),
"DN is not a subordinate of backend" );
Debug( LDAP_DEBUG_CONFIG, "autoca_config: %s\n",
c->cr_msg );
rc = ARG_BAD_CONF;
break;
}
if ( ai->ai_localdn.bv_val ) {
ch_free( ai->ai_localdn.bv_val );
ch_free( ai->ai_localndn.bv_val );
}
ai->ai_localdn = c->value_dn;
ai->ai_localndn = c->value_ndn;
}
}
return rc;
}
static ConfigTable autoca_cfg[] = {
{ "userClass", "objectclass", 2, 2, 0,
ARG_STRING|ARG_MAGIC|ACA_USRCLASS, autoca_cf,
"( OLcfgOvAt:22.1 NAME 'olcAutoCAuserClass' "
"DESC 'ObjectClass of user entries' "
"EQUALITY caseIgnoreMatch "
"SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
{ "serverClass", "objectclass", 2, 2, 0,
ARG_STRING|ARG_MAGIC|ACA_SRVCLASS, autoca_cf,
"( OLcfgOvAt:22.2 NAME 'olcAutoCAserverClass' "
"DESC 'ObjectClass of server entries' "
"EQUALITY caseIgnoreMatch "
"SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
{ "userKeybits", "integer", 2, 2, 0,
ARG_INT|ARG_MAGIC|ACA_USRKEYBITS, autoca_cf,
"( OLcfgOvAt:22.3 NAME 'olcAutoCAuserKeybits' "
"DESC 'Size of PrivateKey for user entries' "
"EQUALITY integerMatch "
"SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
{ "serverKeybits", "integer", 2, 2, 0,
ARG_INT|ARG_MAGIC|ACA_SRVKEYBITS, autoca_cf,
"( OLcfgOvAt:22.4 NAME 'olcAutoCAserverKeybits' "
"DESC 'Size of PrivateKey for server entries' "
"EQUALITY integerMatch "
"SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
{ "caKeybits", "integer", 2, 2, 0,
ARG_INT|ARG_MAGIC|ACA_CAKEYBITS, autoca_cf,
"( OLcfgOvAt:22.5 NAME 'olcAutoCAKeybits' "
"DESC 'Size of PrivateKey for CA certificate' "
"EQUALITY integerMatch "
"SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
{ "userDays", "integer", 2, 2, 0,
ARG_INT|ARG_MAGIC|ACA_USRDAYS, autoca_cf,
"( OLcfgOvAt:22.6 NAME 'olcAutoCAuserDays' "
"DESC 'Lifetime of user certificates in days' "
"EQUALITY integerMatch "
"SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
{ "serverDays", "integer", 2, 2, 0,
ARG_INT|ARG_MAGIC|ACA_SRVDAYS, autoca_cf,
"( OLcfgOvAt:22.7 NAME 'olcAutoCAserverDays' "
"DESC 'Lifetime of server certificates in days' "
"EQUALITY integerMatch "
"SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
{ "caDays", "integer", 2, 2, 0,
ARG_INT|ARG_MAGIC|ACA_CADAYS, autoca_cf,
"( OLcfgOvAt:22.8 NAME 'olcAutoCADays' "
"DESC 'Lifetime of CA certificate in days' "
"EQUALITY integerMatch "
"SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
{ "localdn", "dn", 2, 2, 0,
ARG_DN|ARG_MAGIC|ACA_LOCALDN, autoca_cf,
"( OLcfgOvAt:22.9 NAME 'olcAutoCAlocalDN' "
"DESC 'DN of local server cert' "
"EQUALITY distinguishedNameMatch "
"SYNTAX OMsDN SINGLE-VALUE )", NULL, NULL },
{ NULL, NULL, 0, 0, 0, ARG_IGNORED }
};
static ConfigOCs autoca_ocs[] = {
{ "( OLcfgOvOc:22.1 "
"NAME 'olcAutoCAConfig' "
"DESC 'AutoCA configuration' "
"SUP olcOverlayConfig "
"MAY ( olcAutoCAuserClass $ olcAutoCAserverClass $ "
"olcAutoCAuserKeybits $ olcAutoCAserverKeybits $ olcAutoCAKeyBits $ "
"olcAutoCAuserDays $ olcAutoCAserverDays $ olcAutoCADays $ "
"olcAutoCAlocalDN ) )",
Cft_Overlay, autoca_cfg },
{ NULL, 0, NULL }
};
static int
autoca_op_response(
Operation *op,
SlapReply *rs
)
{
slap_overinst *on = op->o_callback->sc_private;
autoca_info *ai = on->on_bi.bi_private;
Attribute *a;
int isusr = 0;
if (rs->sr_type != REP_SEARCH)
return SLAP_CB_CONTINUE;
/* If root or self */
if ( !be_isroot( op ) &&
!dn_match( &rs->sr_entry->e_nname, &op->o_ndn ))
return SLAP_CB_CONTINUE;
isusr = is_entry_objectclass( rs->sr_entry, ai->ai_usrclass, SLAP_OCF_CHECK_SUP );
if ( !isusr )
{
if (!is_entry_objectclass( rs->sr_entry, ai->ai_srvclass, SLAP_OCF_CHECK_SUP ))
return SLAP_CB_CONTINUE;
}
a = attr_find( rs->sr_entry->e_attrs, ad_usrPkey );
if ( !a )
{
Operation op2;
genargs args;
saveargs arg2;
myext extras[2];
int rc;
args.issuer_cert = ai->ai_cert;
args.issuer_pkey = ai->ai_pkey;
args.subjectDN = &rs->sr_entry->e_name;
args.more_exts = NULL;
if ( isusr )
{
args.cert_exts = usrExts;
args.keybits = ai->ai_usrkeybits;
args.days = ai->ai_usrdays;
a = attr_find( rs->sr_entry->e_attrs, ad_mail );
if ( a )
{
extras[0].name = "subjectAltName";
extras[1].name = NULL;
extras[0].value = op->o_tmpalloc( sizeof("email:") + a->a_vals[0].bv_len, op->o_tmpmemctx );
sprintf(extras[0].value, "email:%s", a->a_vals[0].bv_val);
args.more_exts = extras;
}
} else
{
args.cert_exts = srvExts;
args.keybits = ai->ai_srvkeybits;
args.days = ai->ai_srvdays;
if ( ad_ipaddr && (a = attr_find( rs->sr_entry->e_attrs, ad_ipaddr )))
{
extras[0].name = "subjectAltName";
extras[1].name = NULL;
extras[0].value = op->o_tmpalloc( sizeof("IP:") + a->a_vals[0].bv_len, op->o_tmpmemctx );
sprintf(extras[0].value, "IP:%s", a->a_vals[0].bv_val);
args.more_exts = extras;
}
}
rc = autoca_gencert( op, &args );
if ( rc )
return SLAP_CB_CONTINUE;
X509_free( args.newcert );
EVP_PKEY_free( args.newpkey );
if ( is_entry_objectclass( rs->sr_entry, oc_usrObj, 0 ))
arg2.oc = NULL;
else
arg2.oc = oc_usrObj;
if ( !( rs->sr_flags & REP_ENTRY_MODIFIABLE ))
{
Entry *e = entry_dup( rs->sr_entry );
rs_replace_entry( op, rs, on, e );
rs->sr_flags |= REP_ENTRY_MODIFIABLE | REP_ENTRY_MUSTBEFREED;
}
arg2.dercert = &args.dercert;
arg2.derpkey = &args.derpkey;
arg2.on = on;
arg2.dn = &rs->sr_entry->e_name;
arg2.ndn = &rs->sr_entry->e_nname;
arg2.isca = 0;
op2 = *op;
rc = autoca_savecert( &op2, &arg2 );
if ( !rc )
{
/* If this is our cert DN, configure it */
if ( dn_match( &rs->sr_entry->e_nname, &ai->ai_localndn ))
autoca_setlocal( &op2, &args.dercert, &args.derpkey );
attr_merge_one( rs->sr_entry, ad_usrCert, &args.dercert, NULL );
attr_merge_one( rs->sr_entry, ad_usrPkey, &args.derpkey, NULL );
}
op->o_tmpfree( args.dercert.bv_val, op->o_tmpmemctx );
op->o_tmpfree( args.derpkey.bv_val, op->o_tmpmemctx );
}
return SLAP_CB_CONTINUE;
}
static int
autoca_op_search(
Operation *op,
SlapReply *rs
)
{
/* we only act on a search that returns just our cert/key attrs */
if ( op->ors_attrs && op->ors_attrs[0].an_desc == ad_usrCert &&
op->ors_attrs[1].an_desc == ad_usrPkey &&
op->ors_attrs[2].an_name.bv_val == NULL )
{
slap_overinst *on = (slap_overinst *)op->o_bd->bd_info;
slap_callback *sc = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
sc->sc_response = autoca_op_response;
sc->sc_private = on;
sc->sc_next = op->o_callback;
op->o_callback = sc;
}
return SLAP_CB_CONTINUE;
}
static int
autoca_db_init(
BackendDB *be,
ConfigReply *cr
)
{
slap_overinst *on = (slap_overinst *) be->bd_info;
autoca_info *ai;
ai = ch_calloc(1, sizeof(autoca_info));
on->on_bi.bi_private = ai;
/* set defaults */
ai->ai_usrclass = oc_find( "person" );
ai->ai_srvclass = oc_find( "ipHost" );
ai->ai_usrkeybits = KEYBITS;
ai->ai_srvkeybits = KEYBITS;
ai->ai_cakeybits = KEYBITS;
ai->ai_usrdays = 365; /* 1 year */
ai->ai_srvdays = 1826; /* 5 years */
ai->ai_cadays = 3652; /* 10 years */
return 0;
}
static int
autoca_db_destroy(
BackendDB *be,
ConfigReply *cr
)
{
slap_overinst *on = (slap_overinst *) be->bd_info;
autoca_info *ai = on->on_bi.bi_private;
if ( ai->ai_cert )
X509_free( ai->ai_cert );
if ( ai->ai_pkey )
EVP_PKEY_free( ai->ai_pkey );
ch_free( ai );
return 0;
}
static int
autoca_db_open(
BackendDB *be,
ConfigReply *cr
)
{
slap_overinst *on = (slap_overinst *)be->bd_info;
autoca_info *ai = on->on_bi.bi_private;
Connection conn = { 0 };
OperationBuffer opbuf;
Operation *op;
void *thrctx;
Entry *e;
Attribute *a;
int rc;
if (slapMode & SLAP_TOOL_MODE)
return 0;
if ( ! *aca_attr2[0].ad ) {
int i, code;
const char *text;
for ( i=0; aca_attr2[i].at; i++ ) {
code = slap_str2ad( aca_attr2[i].at, aca_attr2[i].ad, &text );
if ( code ) return code;
}
/* Schema may not be loaded, ignore if missing */
slap_str2ad( "ipHostNumber", &ad_ipaddr, &text );
for ( i=0; aca_ocs[i].ot; i++ ) {
code = register_oc( aca_ocs[i].ot, aca_ocs[i].oc, 0 );
if ( code ) return code;
}
}
thrctx = ldap_pvt_thread_pool_context();
connection_fake_init2( &conn, &opbuf, thrctx, 0 );
op = &opbuf.ob_op;
op->o_bd = be;
op->o_dn = be->be_rootdn;
op->o_ndn = be->be_rootndn;
rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
NULL, 0, &e, on );
if ( e ) {
int gotoc = 0, gotat = 0;
if ( is_entry_objectclass( e, oc_caObj, 0 )) {
gotoc = 1;
a = attr_find( e->e_attrs, ad_caPkey );
if ( a ) {
const unsigned char *pp;
pp = (unsigned char *)a->a_vals[0].bv_val;
ai->ai_pkey = d2i_AutoPrivateKey( NULL, &pp, a->a_vals[0].bv_len );
if ( ai->ai_pkey )
{
a = attr_find( e->e_attrs, ad_caCert );
if ( a )
{
pp = (unsigned char *)a->a_vals[0].bv_val;
ai->ai_cert = d2i_X509( NULL, &pp, a->a_vals[0].bv_len );
/* If TLS wasn't configured yet, set this as our CA */
if ( !slap_tls_ctx )
autoca_setca( a->a_vals );
}
}
gotat = 1;
}
}
overlay_entry_release_ov( op, e, 0, on );
/* generate attrs, store... */
if ( !gotat ) {
genargs args;
saveargs arg2;
args.issuer_cert = NULL;
args.issuer_pkey = NULL;
args.subjectDN = &be->be_suffix[0];
args.cert_exts = CAexts;
args.more_exts = NULL;
args.keybits = ai->ai_cakeybits;
args.days = ai->ai_cadays;
rc = autoca_gencert( op, &args );
if ( rc )
return -1;
ai->ai_cert = args.newcert;
ai->ai_pkey = args.newpkey;
arg2.dn = be->be_suffix;
arg2.ndn = be->be_nsuffix;
arg2.isca = 1;
if ( !gotoc )
arg2.oc = oc_caObj;
else
arg2.oc = NULL;
arg2.on = on;
arg2.dercert = &args.dercert;
arg2.derpkey = &args.derpkey;
autoca_savecert( op, &arg2 );
/* If TLS wasn't configured yet, set this as our CA */
if ( !slap_tls_ctx )
autoca_setca( &args.dercert );
op->o_tmpfree( args.dercert.bv_val, op->o_tmpmemctx );
op->o_tmpfree( args.derpkey.bv_val, op->o_tmpmemctx );
}
}
return 0;
}
static slap_overinst autoca;
/* This overlay is set up for dynamic loading via moduleload. For static
* configuration, you'll need to arrange for the slap_overinst to be
* initialized and registered by some other function inside slapd.
*/
int autoca_initialize() {
int i, code;
autoca.on_bi.bi_type = "autoca";
autoca.on_bi.bi_db_init = autoca_db_init;
autoca.on_bi.bi_db_destroy = autoca_db_destroy;
autoca.on_bi.bi_db_open = autoca_db_open;
autoca.on_bi.bi_op_search = autoca_op_search;
autoca.on_bi.bi_cf_ocs = autoca_ocs;
code = config_register_schema( autoca_cfg, autoca_ocs );
if ( code ) return code;
for ( i=0; aca_attrs[i]; i++ ) {
code = register_at( aca_attrs[i], NULL, 0 );
if ( code ) return code;
}
return overlay_register( &autoca );
}
#if SLAPD_OVER_AUTOCA == SLAPD_MOD_DYNAMIC
int
init_module( int argc, char *argv[] )
{
return autoca_initialize();
}
#endif
#endif /* defined(SLAPD_OVER_AUTOCA) */
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