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/** BEGIN COPYRIGHT BLOCK
* Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
* Copyright (C) 2005 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
/* This file handles configuration information that is specific
* to ldbm instance attribute encryption configuration.
*/
/* DBDB I left in the Sun copyright statement because some of the code
* in this file is derived from an older file : ldbm_index_config.c
*/
#include "back-ldbm.h"
#include "attrcrypt.h"
/* Forward declarations for the callbacks */
int ldbm_instance_attrcrypt_config_add_callback(Slapi_PBlock *pb, Slapi_Entry* entryBefore, Slapi_Entry* e, int *returncode, char *returntext, void *arg);
int ldbm_instance_attrcrypt_config_delete_callback(Slapi_PBlock *pb, Slapi_Entry* entryBefore, Slapi_Entry* e, int *returncode, char *returntext, void *arg);
/*
Config entries look like this:
dn: cn=<attributeName>, cn=encrypted attributes, cn=databaseName, cn=ldbm database, cn=plugins, cn=config
objectclass: top
objectclass: nsAttributeEncryption
cn: <attributeName>
nsEncryptionAlgorithm: <cipherName>
*/
static int
ldbm_attrcrypt_parse_cipher(char* cipher_display_name)
{
attrcrypt_cipher_entry *ce = attrcrypt_cipher_list;
while (ce->cipher_number) {
if (0 == strcmp(ce->cipher_display_name,cipher_display_name)) {
return ce->cipher_number;
}
ce++;
}
return 0;
}
static int
ldbm_attrcrypt_parse_entry(ldbm_instance *inst, Slapi_Entry *e,
char **attribute_name,
int *cipher)
{
Slapi_Attr *attr;
const struct berval *attrValue;
Slapi_Value *sval;
*cipher = 0;
*attribute_name = NULL;
/* Get the name of the attribute to index which will be the value
* of the cn attribute. */
if (slapi_entry_attr_find(e, "cn", &attr) != 0) {
LDAPDebug(LDAP_DEBUG_ANY, "Warning: malformed attribute encryption entry %s\n",
slapi_entry_get_dn(e), 0, 0);
return LDAP_OPERATIONS_ERROR;
}
slapi_attr_first_value(attr, &sval);
attrValue = slapi_value_get_berval(sval);
*attribute_name = slapi_ch_strdup(attrValue->bv_val);
/* Get the list of index types from the entry. */
if (0 == slapi_entry_attr_find(e, "nsEncryptionAlgorithm", &attr)) {
slapi_attr_first_value(attr, &sval);
if (sval) {
attrValue = slapi_value_get_berval(sval);
*cipher = ldbm_attrcrypt_parse_cipher(attrValue->bv_val);
if (0 == *cipher)
LDAPDebug(LDAP_DEBUG_ANY, "Warning: attempt to configure unrecognized cipher %s in encrypted attribute config entry %s\n",
attrValue->bv_val, slapi_entry_get_dn(e), 0);
}
}
return LDAP_SUCCESS;
}
static void
ldbm_instance_attrcrypt_enable(struct attrinfo *ai, int cipher)
{
attrcrypt_private *priv = NULL;
if (NULL == ai->ai_attrcrypt) {
/* No existing private structure, allocate one */
ai->ai_attrcrypt = (attrcrypt_private*) slapi_ch_calloc(1, sizeof(attrcrypt_private));
}
priv = ai->ai_attrcrypt;
priv->attrcrypt_cipher = cipher;
}
static void
ldbm_instance_attrcrypt_disable(struct attrinfo *ai)
{
if (NULL != ai->ai_attrcrypt) {
/* Don't free the structure here, because other threads might be
* concurrently referencing it.
*/
ai->ai_attrcrypt = 0;
}
}
/*
* Config DSE callback for attribute encryption entry add.
*/
int
ldbm_instance_attrcrypt_config_add_callback(Slapi_PBlock *pb, Slapi_Entry* e, Slapi_Entry* eAfter, int *returncode, char *returntext, void *arg)
{
ldbm_instance *inst = (ldbm_instance *) arg;
char *attribute_name = NULL;
int cipher = 0;
int ret = 0;
returntext[0] = '\0';
/* For add, we parse the entry, then check the attribute exists,
* then check that indexing config does not preclude us encrypting it,
* and finally we set the private structure in the attrinfo for the attribute.
*/
*returncode = ldbm_attrcrypt_parse_entry(inst, e, &attribute_name , &cipher);
if (*returncode == LDAP_SUCCESS) {
struct attrinfo *ai = NULL;
/* If the cipher was invalid, return unwilling to perform */
if (0 == cipher) {
returntext = "invalid cipher";
*returncode = LDAP_UNWILLING_TO_PERFORM;
ret = SLAPI_DSE_CALLBACK_ERROR;
} else {
ainfo_get(inst->inst_be, attribute_name, &ai);
/* If we couldn't find a non-default attrinfo, then that means
* that no indexing or encryption has yet been defined for this attribute
* therefore , create a new attrinfo structure now.
*/
if ((ai == NULL) || (0 == strcmp(LDBM_PSEUDO_ATTR_DEFAULT, ai->ai_type) )) {
/* If this attribute doesn't exist in the schema, then we DO NOT fail
* (this is because entensible objects and disabled schema checking allow
* non-schema attributes to exist.
*/
/* Make a new attrinfo object */
attr_create_empty(inst->inst_be,attribute_name,&ai);
}
if (ai) {
ldbm_instance_attrcrypt_enable(ai, cipher);
/* Remember that we have some encryption enabled, so we can be intelligent about warning when SSL is not enabled */
inst->attrcrypt_configured = 1;
} else {
LDAPDebug(LDAP_DEBUG_ANY, "Warning: attempt to encryption on a non-existent attribute: %s\n",
attribute_name, 0, 0);
returntext = "attribute does not exist";
*returncode = LDAP_UNWILLING_TO_PERFORM;
ret = SLAPI_DSE_CALLBACK_ERROR;
}
ret = SLAPI_DSE_CALLBACK_OK;
}
} else {
ret = SLAPI_DSE_CALLBACK_ERROR;
}
if (attribute_name) {
slapi_ch_free(&attribute_name);
}
return ret;
}
/*
* Temp callback that gets called for each attribute encryption entry when a new
* instance is starting up.
*/
int
ldbm_attrcrypt_init_entry_callback(Slapi_PBlock *pb, Slapi_Entry* e, Slapi_Entry* entryAfter, int *returncode, char *returntext, void *arg)
{
return ldbm_instance_attrcrypt_config_add_callback(pb,e,entryAfter,returncode,returntext,arg);
}
/*
* Config DSE callback for attribute encryption deletes.
*/
int
ldbm_instance_attrcrypt_config_delete_callback(Slapi_PBlock *pb, Slapi_Entry* e, Slapi_Entry* entryAfter, int *returncode, char *returntext, void *arg)
{
ldbm_instance *inst = (ldbm_instance *) arg;
char *attribute_name = NULL;
int cipher = 0;
int ret = SLAPI_DSE_CALLBACK_ERROR;
returntext[0] = '\0';
/* For add, we parse the entry, then check the attribute exists,
* then check that indexing config does not preclude us encrypting it,
* and finally we set the private structure in the attrinfo for the attribute.
*/
*returncode = ldbm_attrcrypt_parse_entry(inst, e, &attribute_name , &cipher);
if (*returncode == LDAP_SUCCESS) {
struct attrinfo *ai = NULL;
ainfo_get(inst->inst_be, attribute_name, &ai);
if (ai == NULL && (0 == strcmp(LDBM_PSEUDO_ATTR_DEFAULT, ai->ai_type)) ) {
LDAPDebug(LDAP_DEBUG_ANY, "Warning: attempt to delete encryption for non-existant attribute: %s\n",
attribute_name, 0, 0);
} else {
ldbm_instance_attrcrypt_disable(ai);
ret = SLAPI_DSE_CALLBACK_OK;
}
}
if (attribute_name) {
slapi_ch_free((void **)&attribute_name);
}
return ret;
}
/*
* Config DSE callback for index entry changes.
*
* this function is huge!
*/
int
ldbm_instance_attrcrypt_config_modify_callback(Slapi_PBlock *pb, Slapi_Entry *e,
Slapi_Entry *entryAfter, int *returncode, char *returntext, void *arg)
{
ldbm_instance *inst = (ldbm_instance *)arg;
Slapi_Attr *attr;
Slapi_Value *sval;
const struct berval *attrValue;
struct attrinfo *ainfo = NULL;
LDAPMod **mods;
int i = 0;
int j = 0;
returntext[0] = '\0';
*returncode = LDAP_SUCCESS;
slapi_pblock_get(pb, SLAPI_MODIFY_MODS, &mods);
slapi_entry_attr_find(e, "cn", &attr);
slapi_attr_first_value(attr, &sval);
attrValue = slapi_value_get_berval(sval);
ainfo_get(inst->inst_be, attrValue->bv_val, &ainfo);
if (NULL == ainfo) {
return SLAPI_DSE_CALLBACK_ERROR;
}
for (i = 0; mods[i] != NULL; i++) {
char *config_attr = (char *)mods[i]->mod_type;
/* There are basically three cases in the modify:
* 1. The attribute was added
* 2. The attribute was deleted
* 3. The attribute was modified (deleted and added).
* Now, of these three, only #3 is legal.
* This is because the attribute is mandatory and single-valued in the schema.
* We handle this as follows: an add will always replace what's there (if anything).
* a delete will remove what's there as long as it matches what's being deleted.
* this is to avoid ordering problems with the adds and deletes.
*/
if (strcasecmp(config_attr, "nsEncryptionAlgorithm") == 0) {
if ((mods[i]->mod_op & ~LDAP_MOD_BVALUES) == LDAP_MOD_ADD) {
for (j = 0; mods[i]->mod_bvalues[j] != NULL; j++) {
int cipher = ldbm_attrcrypt_parse_cipher(mods[i]->mod_bvalues[j]->bv_val);
if (0 == cipher) {
/* Tried to configure an invalid cipher */
}
ldbm_instance_attrcrypt_enable(ainfo,cipher);
}
continue;
}
if ((mods[i]->mod_op & ~LDAP_MOD_BVALUES) == LDAP_MOD_DELETE) {
if ((mods[i]->mod_bvalues == NULL) ||
(mods[i]->mod_bvalues[0] == NULL)) {
/* Not legal */
return SLAPI_DSE_CALLBACK_ERROR;
} else {
for (j = 0; mods[i]->mod_bvalues[j] != NULL; j++) {
/* Code before here should ensure that we only ever delete something that was already here */
ldbm_instance_attrcrypt_disable(ainfo);
}
}
continue;
}
}
}
return SLAPI_DSE_CALLBACK_OK;
}
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