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ssl.c
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ssl.c
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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.
*
* License: GPL (version 3 or any later version).
* See LICENSE for details.
* END COPYRIGHT BLOCK **/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/* SSL-related stuff for slapd */
#include <stdio.h>
#include <sys/param.h>
#include <ssl.h>
#include <nss.h>
#include <key.h>
#include <sslproto.h>
#include "secmod.h"
#include <string.h>
#include <errno.h>
#define NEED_TOK_PBE /* defines tokPBE and ptokPBE - see slap.h */
#include "slap.h"
#include <unistd.h>
#include "svrcore.h"
#include "fe.h"
#include "certdb.h"
#if !defined(USE_OPENLDAP)
#include "ldap_ssl.h"
#endif
/* For IRIX... */
#ifndef MAXPATHLEN
#define MAXPATHLEN 1024
#endif
#if NSS_VMAJOR * 100 + NSS_VMINOR >= 315
/* TLS1.2 is defined in RFC5246. */
#define NSS_TLS12 1
#elif NSS_VMAJOR * 100 + NSS_VMINOR >= 314
/* TLS1.1 is defined in RFC4346. */
#define NSS_TLS11 1
#else
#define NSS_TLS10 1
#endif
#if NSS_VMAJOR * 100 + NSS_VMINOR >= 320
#define HAVE_NSS_DHE 1
#endif
/******************************************************************************
* Default SSL Version Rule
* Old SSL version attributes:
* nsSSL3: off -- nsSSL3 == SSL_LIBRARY_VERSION_3_0
* nsTLS1: on -- nsTLS1 == SSL_LIBRARY_VERSION_TLS_1_0 and greater
* Note: TLS1.0 is defined in RFC2246, which is close to SSL 3.0.
* New SSL version attributes:
* sslVersionMin: TLS1.0
* sslVersionMax: max ssl version supported by NSS
******************************************************************************/
#define DEFVERSION "TLS1.0"
#define CURRENT_DEFAULT_SSL_VERSION SSL_LIBRARY_VERSION_TLS_1_0
extern char *slapd_SSL3ciphers;
extern symbol_t supported_ciphers[];
#if !defined(NSS_TLS10) /* NSS_TLS11 or newer */
static SSLVersionRange enabledNSSVersions;
static SSLVersionRange slapdNSSVersions;
#endif
/* dongle_file_name is set in slapd_nss_init when we set the path for the
key, cert, and secmod files - the dongle file must be in the same directory
and use the same naming scheme
*/
static char *dongle_file_name = NULL;
static int _security_library_initialized = 0;
static int _ssl_listener_initialized = 0;
static int _nss_initialized = 0;
/* Our name for the internal token, must match PKCS-11 config data below */
static char *internalTokenName = "Internal (Software) Token";
static int stimeout;
static char *ciphers = NULL;
static char *configDN = "cn=encryption,cn=config";
/* Copied from libadmin/libadmin.h public/nsapi.h */
#define SERVER_KEY_NAME "Server-Key"
#define MAGNUS_ERROR_LEN 1024
#define LOG_WARN 0
#define LOG_FAILURE 3
#define LOG_MSG 4
#define FILE_PATHSEP '/'
/* ----------------------- Multiple cipher support ------------------------ */
/* cipher set flags */
#define CIPHER_SET_NONE 0x0
#define CIPHER_SET_ALL 0x1
#define CIPHER_SET_DEFAULT 0x2
#define CIPHER_SET_DEFAULTWEAKCIPHER 0x10 /* allowWeakCipher is not set in cn=encryption */
#define CIPHER_SET_ALLOWWEAKCIPHER 0x20 /* allowWeakCipher is on */
#define CIPHER_SET_DISALLOWWEAKCIPHER 0x40 /* allowWeakCipher is off */
#ifdef HAVE_NSS_DHE
#define CIPHER_SET_DEFAULTWEAKDHPARAM 0x100 /* allowWeakDhParam is not set in cn=encryption */
#define CIPHER_SET_ALLOWWEAKDHPARAM 0x200 /* allowWeakDhParam is on */
#define CIPHER_SET_DISALLOWWEAKDHPARAM 0x400 /* allowWeakDhParam is off */
#endif
#define CIPHER_SET_ISDEFAULT(flag) \
(((flag)&CIPHER_SET_DEFAULT) ? PR_TRUE : PR_FALSE)
#define CIPHER_SET_ISALL(flag) \
(((flag)&CIPHER_SET_ALL) ? PR_TRUE : PR_FALSE)
#define ALLOWWEAK_ISDEFAULT(flag) \
(((flag)&CIPHER_SET_DEFAULTWEAKCIPHER) ? PR_TRUE : PR_FALSE)
#define ALLOWWEAK_ISON(flag) \
(((flag)&CIPHER_SET_ALLOWWEAKCIPHER) ? PR_TRUE : PR_FALSE)
#define ALLOWWEAK_ISOFF(flag) \
(((flag)&CIPHER_SET_DISALLOWWEAKCIPHER) ? PR_TRUE : PR_FALSE)
/*
* If ISALL or ISDEFAULT, allowWeakCipher is true only if CIPHER_SET_ALLOWWEAKCIPHER.
* Otherwise (user specified cipher list), allowWeakCipher is true
* if CIPHER_SET_ALLOWWEAKCIPHER or CIPHER_SET_DEFAULTWEAKCIPHER.
*/
#define CIPHER_SET_ALLOWSWEAKCIPHER(flag) \
((CIPHER_SET_ISDEFAULT(flag) | CIPHER_SET_ISALL(flag)) ? (ALLOWWEAK_ISON(flag) ? PR_TRUE : PR_FALSE) : (!ALLOWWEAK_ISOFF(flag) ? PR_TRUE : PR_FALSE))
#define CIPHER_SET_DISABLE_ALLOWSWEAKCIPHER(flag) \
((flag) & ~CIPHER_SET_ALLOWWEAKCIPHER)
/* flags */
#define CIPHER_IS_DEFAULT 0x1
#define CIPHER_MUST_BE_DISABLED 0x2
#define CIPHER_IS_WEAK 0x4
#define CIPHER_IS_DEPRECATED 0x8
#ifdef HAVE_NSS_DHE
static int allowweakdhparam = CIPHER_SET_DEFAULTWEAKDHPARAM;
#endif
static char **cipher_names = NULL;
static char **enabled_cipher_names = NULL;
typedef struct
{
char *name;
int num;
int flags;
} cipherstruct;
static cipherstruct *_conf_ciphers = NULL;
static void _conf_init_ciphers(void);
/*
* This lookup table is for supporting the old cipher name.
* Once swtiching to the NSS cipherSuiteName is done,
* this lookup_cipher table can be removed.
*/
typedef struct
{
char *alias;
char *name;
} lookup_cipher;
static lookup_cipher _lookup_cipher[] = {
{"rc4", "SSL_CK_RC4_128_WITH_MD5"},
{"rc4export", "SSL_CK_RC4_128_EXPORT40_WITH_MD5"},
{"rc2", "SSL_CK_RC2_128_CBC_WITH_MD5"},
{"rc2export", "SSL_CK_RC2_128_CBC_EXPORT40_WITH_MD5"},
/*{"idea", "SSL_EN_IDEA_128_CBC_WITH_MD5"}, */
{"des", "SSL_CK_DES_64_CBC_WITH_MD5"},
{"desede3", "SSL_CK_DES_192_EDE3_CBC_WITH_MD5"},
{"rsa_rc4_128_md5", "TLS_RSA_WITH_RC4_128_MD5"},
{"rsa_rc4_128_sha", "TLS_RSA_WITH_RC4_128_SHA"},
{"rsa_3des_sha", "TLS_RSA_WITH_3DES_EDE_CBC_SHA"},
{"tls_rsa_3des_sha", "TLS_RSA_WITH_3DES_EDE_CBC_SHA"},
{"rsa_fips_3des_sha", "SSL_RSA_FIPS_WITH_3DES_EDE_CBC_SHA"},
{"fips_3des_sha", "SSL_RSA_FIPS_WITH_3DES_EDE_CBC_SHA"},
{"rsa_des_sha", "TLS_RSA_WITH_DES_CBC_SHA"},
{"rsa_fips_des_sha", "SSL_RSA_FIPS_WITH_DES_CBC_SHA"},
{"fips_des_sha", "SSL_RSA_FIPS_WITH_DES_CBC_SHA"}, /* ditto */
{"rsa_rc4_40_md5", "TLS_RSA_EXPORT_WITH_RC4_40_MD5"},
{"tls_rsa_rc4_40_md5", "TLS_RSA_EXPORT_WITH_RC4_40_MD5"},
{"rsa_rc2_40_md5", "TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5"},
{"tls_rsa_rc2_40_md5", "TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5"},
{"rsa_null_md5", "TLS_RSA_WITH_NULL_MD5"}, /* disabled by default */
{"rsa_null_sha", "TLS_RSA_WITH_NULL_SHA"}, /* disabled by default */
{"tls_rsa_export1024_with_rc4_56_sha", "TLS_RSA_EXPORT1024_WITH_RC4_56_SHA"},
{"rsa_rc4_56_sha", "TLS_RSA_EXPORT1024_WITH_RC4_56_SHA"}, /* ditto */
{"tls_rsa_export1024_with_des_cbc_sha", "TLS_RSA_EXPORT1024_WITH_DES_CBC_SHA"},
{"rsa_des_56_sha", "TLS_RSA_EXPORT1024_WITH_DES_CBC_SHA"}, /* ditto */
{"fortezza", ""}, /* deprecated */
{"fortezza_rc4_128_sha", ""}, /* deprecated */
{"fortezza_null", ""}, /* deprecated */
/*{"dhe_dss_40_sha", SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA, 0}, */
{"dhe_dss_des_sha", "TLS_DHE_DSS_WITH_DES_CBC_SHA"},
{"dhe_dss_3des_sha", "TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA"},
{"dhe_rsa_40_sha", "TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA"},
{"dhe_rsa_des_sha", "TLS_DHE_RSA_WITH_DES_CBC_SHA"},
{"dhe_rsa_3des_sha", "TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA"},
{"tls_rsa_aes_128_sha", "TLS_RSA_WITH_AES_128_CBC_SHA"},
{"rsa_aes_128_sha", "TLS_RSA_WITH_AES_128_CBC_SHA"}, /* ditto */
{"tls_dh_dss_aes_128_sha", ""}, /* deprecated */
{"tls_dh_rsa_aes_128_sha", ""}, /* deprecated */
{"tls_dhe_dss_aes_128_sha", "TLS_DHE_DSS_WITH_AES_128_CBC_SHA"},
{"tls_dhe_rsa_aes_128_sha", "TLS_DHE_RSA_WITH_AES_128_CBC_SHA"},
{"tls_rsa_aes_256_sha", "TLS_RSA_WITH_AES_256_CBC_SHA"},
{"rsa_aes_256_sha", "TLS_RSA_WITH_AES_256_CBC_SHA"}, /* ditto */
{"tls_dss_aes_256_sha", ""}, /* deprecated */
{"tls_rsa_aes_256_sha", ""}, /* deprecated */
{"tls_dhe_dss_aes_256_sha", "TLS_DHE_DSS_WITH_AES_256_CBC_SHA"},
{"tls_dhe_rsa_aes_256_sha", "TLS_DHE_RSA_WITH_AES_256_CBC_SHA"},
/*{"tls_dhe_dss_1024_des_sha", ""}, */
{"tls_dhe_dss_1024_rc4_sha", "TLS_RSA_EXPORT1024_WITH_RC4_56_SHA"},
{"tls_dhe_dss_rc4_128_sha", "TLS_DHE_DSS_WITH_RC4_128_SHA"},
#if defined(NSS_TLS12)
/* New in NSS 3.15 */
{"tls_rsa_aes_128_gcm_sha", "TLS_RSA_WITH_AES_128_GCM_SHA256"},
{"tls_dhe_rsa_aes_128_gcm_sha", "TLS_DHE_RSA_WITH_AES_128_GCM_SHA256"},
{"tls_dhe_dss_aes_128_gcm_sha", NULL}, /* not available */
#endif
{NULL, NULL}};
/* E.g., "SSL3", "TLS1.2", "Unknown SSL version: 0x0" */
#define VERSION_STR_LENGTH 64
/* Supported SSL versions */
/* nsSSL2: on -- we don't allow this any more. */
PRBool enableSSL2 = PR_FALSE;
/*
* nsSSL3: on -- disable SSLv3 by default.
* Corresonding to SSL_LIBRARY_VERSION_3_0
*/
PRBool enableSSL3 = PR_FALSE;
/*
* nsTLS1: on -- enable TLS1 by default.
* Corresonding to SSL_LIBRARY_VERSION_TLS_1_0 and greater.
*/
PRBool enableTLS1 = PR_TRUE;
/*
* OpenLDAP client library with OpenSSL (ticket 47536)
*/
#define PEMEXT ".pem"
/* CA cert pem file */
static char *CACertPemFile = NULL;
/* helper functions for openldap update. */
static int slapd_extract_cert(Slapi_Entry *entry, int isCA);
static int slapd_extract_key(Slapi_Entry *entry, char *token, PK11SlotInfo *slot);
static void entrySetValue(Slapi_DN *sdn, char *type, char *value);
static char *gen_pem_path(char *filename);
static void
slapd_SSL_report(int degree, char *fmt, va_list args)
{
char buf[2048];
char *msg = NULL;
int sev;
if (degree == LOG_FAILURE) {
sev = SLAPI_LOG_ERR;
msg = "failure";
} else if (degree == LOG_WARN) {
sev = SLAPI_LOG_WARNING;
msg = "alert";
} else {
sev = SLAPI_LOG_INFO;
msg = "info";
}
PR_vsnprintf(buf, sizeof(buf), fmt, args);
slapi_log_err(sev, "Security Initialization", "SSL %s: %s\n", msg, buf);
}
void
slapd_SSL_error(char *fmt, ...)
{
va_list args;
va_start(args, fmt);
slapd_SSL_report(LOG_FAILURE, fmt, args);
va_end(args);
}
void
slapd_SSL_warn(char *fmt, ...)
{
va_list args;
va_start(args, fmt);
slapd_SSL_report(LOG_WARN, fmt, args);
va_end(args);
}
void
slapd_SSL_info(char *fmt, ...)
{
va_list args;
va_start(args, fmt);
slapd_SSL_report(LOG_MSG, fmt, args);
va_end(args);
}
char **
getSupportedCiphers(void)
{
SSLCipherSuiteInfo info;
char *sep = "::";
int number_of_ciphers = SSL_NumImplementedCiphers;
int i;
int idx = 0;
PRBool isFIPS = slapd_pk11_isFIPS();
_conf_init_ciphers();
if ((cipher_names == NULL) && (_conf_ciphers)) {
cipher_names = (char **)slapi_ch_calloc((number_of_ciphers + 1), sizeof(char *));
for (i = 0; _conf_ciphers[i].name != NULL; i++) {
SSL_GetCipherSuiteInfo((PRUint16)_conf_ciphers[i].num, &info, sizeof(info));
/* only support FIPS approved ciphers in FIPS mode */
if (!isFIPS || info.isFIPS) {
cipher_names[idx++] = slapi_ch_smprintf("%s%s%s%s%s%s%d",
_conf_ciphers[i].name, sep,
info.symCipherName, sep,
info.macAlgorithmName, sep,
info.symKeyBits);
}
}
cipher_names[idx] = NULL;
}
return cipher_names;
}
#ifdef HAVE_NSS_DHE
int
get_allow_weak_dh_param(Slapi_Entry *e)
{
/* Check if the user wants weak params */
int allow = CIPHER_SET_DEFAULTWEAKDHPARAM;
char *val;
val = slapi_entry_attr_get_charptr(e, "allowWeakDHParam");
if (val) {
if (!PL_strcasecmp(val, "off") || !PL_strcasecmp(val, "false") ||
!PL_strcmp(val, "0") || !PL_strcasecmp(val, "no")) {
allow = CIPHER_SET_DISALLOWWEAKDHPARAM;
} else if (!PL_strcasecmp(val, "on") || !PL_strcasecmp(val, "true") ||
!PL_strcmp(val, "1") || !PL_strcasecmp(val, "yes")) {
allow = CIPHER_SET_ALLOWWEAKDHPARAM;
slapd_SSL_warn("The value of allowWeakDHParam is set to %s. THIS EXPOSES YOU TO CVE-2015-4000.", val);
} else {
slapd_SSL_warn("The value of allowWeakDHParam \"%s\" is invalid.",
"Ignoring it and set it to default.", val);
}
}
slapi_ch_free((void **)&val);
return allow;
}
#endif
char **
getEnabledCiphers(void)
{
SSLCipherSuiteInfo info;
char *sep = "::";
int number_of_ciphers = 0;
int x;
int idx = 0;
PRBool enabled;
/* We have to wait until the SSL initialization is done. */
if (!slapd_ssl_listener_is_initialized()) {
return NULL;
}
if ((enabled_cipher_names == NULL) && _conf_ciphers) {
for (x = 0; _conf_ciphers[x].name; x++) {
SSL_CipherPrefGetDefault(_conf_ciphers[x].num, &enabled);
if (enabled) {
number_of_ciphers++;
}
}
enabled_cipher_names = (char **)slapi_ch_calloc((number_of_ciphers + 1), sizeof(char *));
for (x = 0; _conf_ciphers[x].name; x++) {
SSL_CipherPrefGetDefault(_conf_ciphers[x].num, &enabled);
if (enabled) {
SSL_GetCipherSuiteInfo((PRUint16)_conf_ciphers[x].num, &info, sizeof(info));
enabled_cipher_names[idx++] = slapi_ch_smprintf("%s%s%s%s%s%s%d",
_conf_ciphers[x].name, sep,
info.symCipherName, sep,
info.macAlgorithmName, sep,
info.symKeyBits);
}
}
}
return enabled_cipher_names;
}
static PRBool
cipher_check_fips(int idx, char ***suplist, char ***unsuplist)
{
PRBool rc = PR_TRUE;
if (_conf_ciphers && slapd_pk11_isFIPS()) {
SSLCipherSuiteInfo info;
if (SECFailure == SSL_GetCipherSuiteInfo((PRUint16)_conf_ciphers[idx].num,
&info, sizeof info)) {
PRErrorCode errorCode = PR_GetError();
if (slapi_is_loglevel_set(SLAPI_LOG_CONFIG)) {
slapd_SSL_warn("No information for cipher suite [%s] "
"error %d - %s",
_conf_ciphers[idx].name,
errorCode, slapd_pr_strerror(errorCode));
}
rc = PR_FALSE;
}
if (rc && !info.isFIPS) {
if (slapi_is_loglevel_set(SLAPI_LOG_CONFIG)) {
slapd_SSL_warn("FIPS mode is enabled but "
"cipher suite [%s] is not approved for FIPS - "
"the cipher suite will be disabled - if "
"you want to use this cipher suite, you must use modutil to "
"disable FIPS in the internal token.",
_conf_ciphers[idx].name);
}
rc = PR_FALSE;
}
if (!rc && unsuplist && !charray_inlist(*unsuplist, _conf_ciphers[idx].name)) {
charray_add(unsuplist, _conf_ciphers[idx].name);
}
if (rc && suplist && !charray_inlist(*suplist, _conf_ciphers[idx].name)) {
charray_add(suplist, _conf_ciphers[idx].name);
}
}
return rc;
}
int
getSSLVersionInfo(int *ssl2, int *ssl3, int *tls1)
{
if (!slapd_ssl_listener_is_initialized()) {
return -1;
}
*ssl2 = enableSSL2;
*ssl3 = enableSSL3;
*tls1 = enableTLS1;
return 0;
}
int
getSSLVersionRange(char **min, char **max)
{
if (!min && !max) {
return -1;
}
if (!slapd_ssl_listener_is_initialized()) {
if (min) {
*min = slapi_getSSLVersion_str(LDAP_OPT_X_TLS_PROTOCOL_TLS1_0, NULL, 0);
}
if (max) {
*max = slapi_getSSLVersion_str(LDAP_OPT_X_TLS_PROTOCOL_TLS1_2, NULL, 0);
}
return -1;
}
#if defined(NSS_TLS10)
return -1; /* not supported */
#else /* NSS_TLS11 or newer */
if (min) {
*min = slapi_getSSLVersion_str(slapdNSSVersions.min, NULL, 0);
}
if (max) {
*max = slapi_getSSLVersion_str(slapdNSSVersions.max, NULL, 0);
}
return 0;
#endif
}
#if defined(USE_OPENLDAP)
void
getSSLVersionRangeOL(int *min, int *max)
{
/* default range values */
if (min) {
*min = LDAP_OPT_X_TLS_PROTOCOL_TLS1_0;
}
if (max) {
*max = LDAP_OPT_X_TLS_PROTOCOL_TLS1_2;
}
if (!slapd_ssl_listener_is_initialized()) {
return;
}
#if defined(NSS_TLS10)
*max = LDAP_OPT_X_TLS_PROTOCOL_TLS1_0;
return;
#else /* NSS_TLS11 or newer */
if (min) {
switch (slapdNSSVersions.min) {
case SSL_LIBRARY_VERSION_3_0:
*min = LDAP_OPT_X_TLS_PROTOCOL_SSL3;
break;
case SSL_LIBRARY_VERSION_TLS_1_0:
*min = LDAP_OPT_X_TLS_PROTOCOL_TLS1_0;
break;
case SSL_LIBRARY_VERSION_TLS_1_1:
*min = LDAP_OPT_X_TLS_PROTOCOL_TLS1_1;
break;
case SSL_LIBRARY_VERSION_TLS_1_2:
*min = LDAP_OPT_X_TLS_PROTOCOL_TLS1_2;
break;
default:
if (slapdNSSVersions.min > SSL_LIBRARY_VERSION_TLS_1_2) {
*min = LDAP_OPT_X_TLS_PROTOCOL_TLS1_2 + 1;
} else {
*min = LDAP_OPT_X_TLS_PROTOCOL_SSL3;
}
break;
}
}
if (max) {
switch (slapdNSSVersions.max) {
case SSL_LIBRARY_VERSION_3_0:
*max = LDAP_OPT_X_TLS_PROTOCOL_SSL3;
break;
case SSL_LIBRARY_VERSION_TLS_1_0:
*max = LDAP_OPT_X_TLS_PROTOCOL_TLS1_0;
break;
case SSL_LIBRARY_VERSION_TLS_1_1:
*max = LDAP_OPT_X_TLS_PROTOCOL_TLS1_1;
break;
case SSL_LIBRARY_VERSION_TLS_1_2:
*max = LDAP_OPT_X_TLS_PROTOCOL_TLS1_2;
break;
default:
if (slapdNSSVersions.max > SSL_LIBRARY_VERSION_TLS_1_2) {
*max = LDAP_OPT_X_TLS_PROTOCOL_TLS1_2 + 1;
} else {
*max = LDAP_OPT_X_TLS_PROTOCOL_SSL3;
}
break;
}
}
return;
#endif
}
#endif /* USE_OPENLDAP */
static void
_conf_init_ciphers(void)
{
int x;
SECStatus rc;
SSLCipherSuiteInfo info;
const PRUint16 *implementedCiphers = SSL_GetImplementedCiphers();
/* Initialize _conf_ciphers */
if (_conf_ciphers) {
return;
}
_conf_ciphers = (cipherstruct *)slapi_ch_calloc(SSL_NumImplementedCiphers + 1, sizeof(cipherstruct));
for (x = 0; implementedCiphers && (x < SSL_NumImplementedCiphers); x++) {
rc = SSL_GetCipherSuiteInfo(implementedCiphers[x], &info, sizeof info);
if (SECFailure == rc) {
slapi_log_err(SLAPI_LOG_ERR, "Security Initialization",
"_conf_init_ciphers - Failed to get the cipher suite info of cipher ID %d\n",
implementedCiphers[x]);
continue;
}
if (!_conf_ciphers[x].num) { /* initialize each cipher */
_conf_ciphers[x].name = slapi_ch_strdup(info.cipherSuiteName);
_conf_ciphers[x].num = implementedCiphers[x];
if (info.symCipher == ssl_calg_null) {
_conf_ciphers[x].flags |= CIPHER_MUST_BE_DISABLED;
} else {
_conf_ciphers[x].flags |= info.isExportable ? CIPHER_IS_WEAK : (info.symCipher < ssl_calg_3des) ? CIPHER_IS_WEAK : (info.effectiveKeyBits < 128) ? CIPHER_IS_WEAK : 0;
}
}
}
return;
}
/*
* flag: CIPHER_SET_ALL -- enable all
* CIPHER_SET_NONE -- disable all
* CIPHER_SET_DEFAULT -- set default ciphers
* CIPHER_SET_ALLOW_WEAKCIPHER -- allow weak ciphers (can be or'ed with the ather CIPHER_SET flags)
*/
static void
_conf_setallciphers(int flag, char ***suplist, char ***unsuplist)
{
int x;
SECStatus rc;
PRBool setdefault = CIPHER_SET_ISDEFAULT(flag);
PRBool enabled = CIPHER_SET_ISALL(flag);
PRBool allowweakcipher = CIPHER_SET_ALLOWSWEAKCIPHER(flag);
PRBool setme = PR_FALSE;
const PRUint16 *implementedCiphers = SSL_GetImplementedCiphers();
_conf_init_ciphers();
for (x = 0; implementedCiphers && (x < SSL_NumImplementedCiphers); x++) {
if (_conf_ciphers[x].flags & CIPHER_IS_DEFAULT) {
/* certainly, not the first time. */
setme = PR_TRUE;
} else if (setdefault) {
/*
* SSL_CipherPrefGetDefault
* If the application has not previously set the default preference,
* SSL_CipherPrefGetDefault returns the factory setting.
*/
rc = SSL_CipherPrefGetDefault(_conf_ciphers[x].num, &setme);
if (SECFailure == rc) {
slapi_log_err(SLAPI_LOG_ERR, "Security Initialization",
"_conf_setallciphers - Failed to get the default state of cipher %s\n",
_conf_ciphers[x].name);
continue;
}
if (!allowweakcipher && (_conf_ciphers[x].flags & CIPHER_IS_WEAK)) {
setme = PR_FALSE;
}
_conf_ciphers[x].flags |= setme ? CIPHER_IS_DEFAULT : 0;
} else if (enabled && !(_conf_ciphers[x].flags & CIPHER_MUST_BE_DISABLED)) {
if (!allowweakcipher && (_conf_ciphers[x].flags & CIPHER_IS_WEAK)) {
setme = PR_FALSE;
} else {
setme = PR_TRUE;
}
} else {
setme = PR_FALSE;
}
if (setme) {
setme = cipher_check_fips(x, suplist, unsuplist);
}
SSL_CipherPrefSetDefault(_conf_ciphers[x].num, setme);
}
}
static char *
charray2str(char **ary, const char *delim)
{
char *str = NULL;
while (ary && *ary) {
if (str) {
str = PR_sprintf_append(str, "%s%s", delim, *ary++);
} else {
str = slapi_ch_smprintf("%s", *ary++);
}
}
return str;
}
void
_conf_dumpciphers(void)
{
int x;
PRBool enabled;
/* {"SSL3","rc4", SSL_EN_RC4_128_WITH_MD5}, */
slapd_SSL_info("Configured NSS Ciphers");
for (x = 0; _conf_ciphers[x].name; x++) {
SSL_CipherPrefGetDefault(_conf_ciphers[x].num, &enabled);
if (enabled) {
slapd_SSL_info("\t%s: enabled%s%s%s", _conf_ciphers[x].name,
(_conf_ciphers[x].flags & CIPHER_IS_WEAK) ? ", (WEAK CIPHER)" : "",
(_conf_ciphers[x].flags & CIPHER_IS_DEPRECATED) ? ", (DEPRECATED)" : "",
(_conf_ciphers[x].flags & CIPHER_MUST_BE_DISABLED) ? ", (MUST BE DISABLED)" : "");
} else if (slapi_is_loglevel_set(SLAPI_LOG_CONFIG)) {
slapd_SSL_info("\t%s: disabled%s%s%s", _conf_ciphers[x].name,
(_conf_ciphers[x].flags & CIPHER_IS_WEAK) ? ", (WEAK CIPHER)" : "",
(_conf_ciphers[x].flags & CIPHER_IS_DEPRECATED) ? ", (DEPRECATED)" : "",
(_conf_ciphers[x].flags & CIPHER_MUST_BE_DISABLED) ? ", (MUST BE DISABLED)" : "");
}
}
}
char *
_conf_setciphers(char *setciphers, int flags)
{
char *t, err[MAGNUS_ERROR_LEN];
int x, i, active;
char *raw = setciphers;
char **suplist = NULL;
char **unsuplist = NULL;
PRBool enabledOne = PR_FALSE;
/* #47838: harden the list of ciphers available by default */
/* Default is to activate all of them ==> none of them*/
if (!setciphers || (setciphers[0] == '\0') || !PL_strcasecmp(setciphers, "default")) {
_conf_setallciphers((CIPHER_SET_DEFAULT | flags), NULL, NULL);
slapd_SSL_info("Enabling default cipher set.");
_conf_dumpciphers();
return NULL;
}
if (PL_strcasestr(setciphers, "+all")) {
/*
* Enable all the ciphers if "+all" and the following while loop would
* disable the user disabled ones. This is needed because we added a new
* set of ciphers in the table. Right now there is no support for this
* from the console
*/
_conf_setallciphers((CIPHER_SET_ALL | flags), &suplist, NULL);
enabledOne = PR_TRUE;
} else {
/* If "+all" is not in nsSSL3Ciphers value, disable all first,
* then enable specified ciphers. */
_conf_setallciphers(CIPHER_SET_NONE /* disabled */, NULL, NULL);
}
t = setciphers;
while (t) {
while ((*setciphers) && (isspace(*setciphers)))
++setciphers;
switch (*setciphers++) {
case '+':
active = 1;
break;
case '-':
active = 0;
break;
default:
PR_snprintf(err, sizeof(err), "invalid ciphers <%s>: format is "
"+cipher1,-cipher2...",
raw);
return slapi_ch_strdup(err);
}
if ((t = strchr(setciphers, ',')))
*t++ = '\0';
if (strcasecmp(setciphers, "all")) { /* if not all */
PRBool enabled = active ? PR_TRUE : PR_FALSE;
int lookup = 1;
for (x = 0; _conf_ciphers[x].name; x++) {
if (!PL_strcasecmp(setciphers, _conf_ciphers[x].name)) {
if (_conf_ciphers[x].flags & CIPHER_IS_WEAK) {
if (active && CIPHER_SET_ALLOWSWEAKCIPHER(flags)) {
slapd_SSL_warn("Cipher %s is weak. It is enabled since allowWeakCipher is \"on\" "
"(default setting for the backward compatibility). "
"We strongly recommend to set it to \"off\". "
"Please replace the value of allowWeakCipher with \"off\" in "
"the encryption config entry cn=encryption,cn=config and "
"restart the server.",
setciphers);
} else {
/* if the cipher is weak and we don't allow weak cipher,
disable it. */
enabled = PR_FALSE;
}
}
if (enabled) {
/* if the cipher is not weak or we allow weak cipher,
check fips. */
enabled = cipher_check_fips(x, NULL, &unsuplist);
}
if (enabled) {
enabledOne = PR_TRUE; /* At least one active cipher is set. */
}
SSL_CipherPrefSetDefault(_conf_ciphers[x].num, enabled);
lookup = 0;
break;
}
}
if (lookup) { /* lookup with old cipher name and get NSS cipherSuiteName */
for (i = 0; _lookup_cipher[i].alias; i++) {
if (!PL_strcasecmp(setciphers, _lookup_cipher[i].alias)) {
if (enabled && !_lookup_cipher[i].name[0]) {
slapd_SSL_warn("Cipher suite %s is not available in NSS %d.%d. Ignoring %s",
setciphers, NSS_VMAJOR, NSS_VMINOR, setciphers);
continue;
}
for (x = 0; _conf_ciphers[x].name; x++) {
if (!PL_strcasecmp(_lookup_cipher[i].name, _conf_ciphers[x].name)) {
if (enabled) {
if (_conf_ciphers[x].flags & CIPHER_IS_WEAK) {
if (active && CIPHER_SET_ALLOWSWEAKCIPHER(flags)) {
slapd_SSL_warn("Cipher %s is weak. "
"It is enabled since allowWeakCipher is \"on\" "
"(default setting for the backward compatibility). "
"We strongly recommend to set it to \"off\". "
"Please replace the value of allowWeakCipher with \"off\" in "
"the encryption config entry cn=encryption,cn=config and "
"restart the server.",
setciphers);
} else {
/* if the cipher is weak and we don't allow weak cipher,
disable it. */
enabled = PR_FALSE;
}
}
if (enabled) {
/* if the cipher is not weak or we allow weak cipher,
check fips. */
enabled = cipher_check_fips(x, NULL, &unsuplist);
}
}
if (enabled) {
enabledOne = PR_TRUE; /* At least one active cipher is set. */
}
SSL_CipherPrefSetDefault(_conf_ciphers[x].num, enabled);
break;
}
}
break;
}
}
}
if (!lookup && !_conf_ciphers[x].name) { /* If lookup, it's already reported. */
slapd_SSL_warn("Cipher suite %s is not available in NSS %d.%d. Ignoring %s",
setciphers, NSS_VMAJOR, NSS_VMINOR, setciphers);
}
}
if (t) {
setciphers = t;
}
}
if (unsuplist && *unsuplist) {
char *strsup = charray2str(suplist, ",");
char *strunsup = charray2str(unsuplist, ",");
slapd_SSL_warn("FIPS mode is enabled - only the following "
"cipher suites are approved for FIPS: [%s] - "
"the specified cipher suites [%s] are disabled - if "
"you want to use these unsupported cipher suites, you must use modutil to "
"disable FIPS in the internal token.",
strsup ? strsup : "(none)", strunsup ? strunsup : "(none)");
slapi_ch_free_string(&strsup);
slapi_ch_free_string(&strunsup);
}
slapi_ch_free((void **)&suplist); /* strings inside are static */
slapi_ch_free((void **)&unsuplist); /* strings inside are static */
if (!enabledOne) {
char *nocipher = slapi_ch_smprintf("No active cipher suite is available.");
return nocipher;
}
_conf_dumpciphers();
return NULL;
}
/* SSL Policy stuff */
/*
* SSLPLCY_Install
*
* Call the SSL_CipherPolicySet function for each ciphersuite.
*/
PRStatus
SSLPLCY_Install(void)
{
SECStatus s = 0;
s = NSS_SetDomesticPolicy();
return s ? PR_FAILURE : PR_SUCCESS;
}
/**
* Get a particular entry
*/
static Slapi_Entry *
getConfigEntry(const char *dn, Slapi_Entry **e2)
{
Slapi_DN sdn;
slapi_sdn_init_dn_byref(&sdn, dn);
slapi_search_internal_get_entry(&sdn, NULL, e2,
plugin_get_default_component_id());
slapi_sdn_done(&sdn);
return *e2;
}
/**
* Free an entry
*/
static void
freeConfigEntry(Slapi_Entry **e)
{
if ((e != NULL) && (*e != NULL)) {
slapi_entry_free(*e);
*e = NULL;
}
}
/**
* Get a list of child DNs
*/
static char **
getChildren(char *dn)
{
Slapi_PBlock *new_pb = NULL;
Slapi_Entry **e;
int search_result = 1;
int nEntries = 0;
char **list = NULL;
new_pb = slapi_search_internal(dn, LDAP_SCOPE_ONELEVEL,
"(objectclass=nsEncryptionModule)",
NULL, NULL, 0);
slapi_pblock_get(new_pb, SLAPI_NENTRIES, &nEntries);
if (nEntries > 0) {
slapi_pblock_get(new_pb, SLAPI_PLUGIN_INTOP_RESULT, &search_result);
slapi_pblock_get(new_pb, SLAPI_PLUGIN_INTOP_SEARCH_ENTRIES, &e);
if (e != NULL) {
int i;
list = (char **)slapi_ch_malloc(sizeof(*list) * (nEntries + 1));
for (i = 0; e[i] != NULL; i++) {
list[i] = slapi_ch_strdup(slapi_entry_get_dn(e[i]));
}
list[nEntries] = NULL;
}
}
slapi_free_search_results_internal(new_pb);
slapi_pblock_destroy(new_pb);
return list;
}
/**
* Free a list of child DNs
*/
static void
freeChildren(char **list)
{
if (list != NULL) {
int i;
for (i = 0; list[i] != NULL; i++) {
slapi_ch_free((void **)(&list[i]));
}
slapi_ch_free((void **)(&list));
}
}
static void
entrySetValue(Slapi_DN *sdn, char *type, char *value)
{
Slapi_PBlock *mypb = slapi_pblock_new();
LDAPMod attr;
LDAPMod *mods[2];
char *values[2];
values[0] = value;
values[1] = NULL;
/* modify the attribute */
attr.mod_type = type;
attr.mod_op = LDAP_MOD_REPLACE;
attr.mod_values = values;
mods[0] = &attr;
mods[1] = NULL;
slapi_modify_internal_set_pb_ext(mypb, sdn, mods, NULL, NULL, (void *)plugin_get_default_component_id(), 0);
slapi_modify_internal_pb(mypb);
slapi_pblock_destroy(mypb);
}
/* Logs a warning and returns 1 if cert file doesn't exist. You
* can skip the warning log message by setting no_log to 1.*/
static int
warn_if_no_cert_file(const char *dir, int no_log)
{
int ret = 0;
char *filename = slapi_ch_smprintf("%s/cert8.db", dir);
PRStatus status = PR_Access(filename, PR_ACCESS_READ_OK);
if (PR_SUCCESS != status) {
slapi_ch_free_string(&filename);
filename = slapi_ch_smprintf("%s/cert9.db", dir);
status = PR_Access(filename, PR_ACCESS_READ_OK);
if (PR_SUCCESS != status) {
ret = 1;
if (!no_log) {
slapi_log_err(SLAPI_LOG_CRIT, "Security Initialization",
"warn_if_no_cert_file - Certificate DB file cert8.db nor cert9.db exists in [%s] - SSL initialization will likely fail\n", dir);
}
}
}
slapi_ch_free_string(&filename);
return ret;
}
/* Logs a warning and returns 1 if key file doesn't exist. You
* can skip the warning log message by setting no_log to 1.*/
static int
warn_if_no_key_file(const char *dir, int no_log)
{
int ret = 0;