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upsclient.c
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/* upsclient - network communications functions for UPS clients
Copyright (C)
2002 Russell Kroll <[email protected]>
2008 Arjen de Korte <[email protected]>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h" /* safe because it doesn't contain prototypes */
#include "nut_platform.h"
#ifdef HAVE_PTHREAD
/* this include is needed on AIX to have errno stored in thread local storage */
#include <pthread.h>
#endif
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include "upsclient.h"
#include "common.h"
#include "nut_stdint.h"
#include "timehead.h"
/* WA for Solaris/i386 bug: non-blocking connect sets errno to ENOENT */
#if (defined NUT_PLATFORM_SOLARIS)
#define SOLARIS_i386_NBCONNECT_ENOENT(status) ( (!strcmp("i386", CPU_TYPE)) ? (ENOENT == (status)) : 0 )
#else
#define SOLARIS_i386_NBCONNECT_ENOENT(status) (0)
#endif /* end of Solaris/i386 WA for non-blocking connect */
/* WA for AIX bug: non-blocking connect sets errno to 0 */
#if (defined NUT_PLATFORM_AIX)
#define AIX_NBCONNECT_0(status) (0 == (status))
#else
#define AIX_NBCONNECT_0(status) (0)
#endif /* end of AIX WA for non-blocking connect */
#ifdef WITH_NSS
#include <prerror.h>
#include <prinit.h>
#include <pk11func.h>
#include <prtypes.h>
#include <ssl.h>
#include <private/pprio.h>
#endif /* WITH_NSS */
#define UPSCLIENT_MAGIC 0x19980308
#define SMALLBUF 512
#ifdef SHUT_RDWR
#define shutdown_how SHUT_RDWR
#else
#define shutdown_how 2
#endif
static struct {
int flags;
const char *str;
} upscli_errlist[] =
{
{ 0, "Unknown error" }, /* 0: UPSCLI_ERR_UNKNOWN */
{ 0, "Variable not supported by UPS" }, /* 1: UPSCLI_ERR_VARNOTSUPP */
{ 0, "No such host" }, /* 2: UPSCLI_ERR_NOSUCHHOST */
{ 0, "Invalid response from server" }, /* 3: UPSCLI_ERR_INVRESP */
{ 0, "Unknown UPS" }, /* 4: UPSCLI_ERR_UNKNOWNUPS */
{ 0, "Invalid list type" }, /* 5: UPSCLI_ERR_INVLISTTYPE */
{ 0, "Access denied" }, /* 6: UPSCLI_ERR_ACCESSDENIED */
{ 0, "Password required" }, /* 7: UPSCLI_ERR_PWDREQUIRED */
{ 0, "Password incorrect" }, /* 8: UPSCLI_ERR_PWDINCORRECT */
{ 0, "Missing argument" }, /* 9: UPSCLI_ERR_MISSINGARG */
{ 0, "Data stale" }, /* 10: UPSCLI_ERR_DATASTALE */
{ 0, "Variable unknown" }, /* 11: UPSCLI_ERR_VARUNKNOWN */
{ 0, "Already logged in" }, /* 12: UPSCLI_ERR_LOGINTWICE */
{ 0, "Already set password" }, /* 13: UPSCLI_ERR_PWDSETTWICE */
{ 0, "Unknown variable type" }, /* 14: UPSCLI_ERR_UNKNOWNTYPE */
{ 0, "Unknown variable" }, /* 15: UPSCLI_ERR_UNKNOWNVAR */
{ 0, "Read-only variable" }, /* 16: UPSCLI_ERR_VARREADONLY */
{ 0, "New value is too long" }, /* 17: UPSCLI_ERR_TOOLONG */
{ 0, "Invalid value for variable" }, /* 18: UPSCLI_ERR_INVALIDVALUE */
{ 0, "Set command failed" }, /* 19: UPSCLI_ERR_SETFAILED */
{ 0, "Unknown instant command" }, /* 20: UPSCLI_ERR_UNKINSTCMD */
{ 0, "Instant command failed" }, /* 21: UPSCLI_ERR_CMDFAILED */
{ 0, "Instant command not supported" }, /* 22: UPSCLI_ERR_CMDNOTSUPP */
{ 0, "Invalid username" }, /* 23: UPSCLI_ERR_INVUSERNAME */
{ 0, "Already set username" }, /* 24: UPSCLI_ERR_USERSETTWICE */
{ 0, "Unknown command" }, /* 25: UPSCLI_ERR_UNKCOMMAND */
{ 0, "Invalid argument" }, /* 26: UPSCLI_ERR_INVALIDARG */
{ 1, "Send failure: %s" }, /* 27: UPSCLI_ERR_SENDFAILURE */
{ 1, "Receive failure: %s" }, /* 28: UPSCLI_ERR_RECVFAILURE */
{ 1, "socket failure: %s" }, /* 29: UPSCLI_ERR_SOCKFAILURE */
{ 1, "bind failure: %s" }, /* 30: UPSCLI_ERR_BINDFAILURE */
{ 1, "Connection failure: %s" }, /* 31: UPSCLI_ERR_CONNFAILURE */
{ 1, "Write error: %s" }, /* 32: UPSCLI_ERR_WRITE */
{ 1, "Read error: %s" }, /* 33: UPSCLI_ERR_READ */
{ 0, "Invalid password" }, /* 34: UPSCLI_ERR_INVPASSWORD */
{ 0, "Username required" }, /* 35: UPSCLI_ERR_USERREQUIRED */
{ 0, "SSL is not available", }, /* 36: UPSCLI_ERR_SSLFAIL */
{ 2, "SSL error: %s", }, /* 37: UPSCLI_ERR_SSLERR */
{ 0, "Server disconnected", }, /* 38: UPSCLI_ERR_SRVDISC */
{ 0, "Driver not connected", }, /* 39: UPSCLI_ERR_DRVNOTCONN */
{ 0, "Memory allocation failure", }, /* 40: UPSCLI_ERR_NOMEM */
{ 3, "Parse error: %s", }, /* 41: UPSCLI_ERR_PARSE */
{ 0, "Protocol error", }, /* 42: UPSCLI_ERR_PROTOCOL */
};
typedef struct HOST_CERT_s {
const char *host;
const char *certname;
int certverify;
int forcessl;
struct HOST_CERT_s *next;
} HOST_CERT_t;
static HOST_CERT_t* upscli_find_host_cert(const char* hostname);
static int upscli_initialized = 0;
#ifdef WITH_OPENSSL
static SSL_CTX *ssl_ctx;
#elif defined(WITH_NSS) /* WITH_OPENSLL */
static int verify_certificate = 1;
static HOST_CERT_t *first_host_cert = NULL;
static char* nsscertname = NULL;
static char* nsscertpasswd = NULL;
#endif /* WITH_OPENSSL | WITH_NSS */
#ifdef WITH_OPENSSL
static void ssl_debug(void)
{
unsigned long e;
char errmsg[SMALLBUF];
while ((e = ERR_get_error()) != 0) {
ERR_error_string_n(e, errmsg, sizeof(errmsg));
upsdebugx(2, "ssl_debug: %s", errmsg);
}
}
static int ssl_error(SSL *ssl, ssize_t ret)
{
int e;
if (ret >= INT_MAX) {
upslogx(LOG_ERR, "ssl_error() ret=%zd would not fit in an int", ret);
return -1;
}
e = SSL_get_error(ssl, (int)ret);
switch (e)
{
case SSL_ERROR_WANT_READ:
upslogx(LOG_ERR, "ssl_error() ret=%zd SSL_ERROR_WANT_READ", ret);
break;
case SSL_ERROR_WANT_WRITE:
upslogx(LOG_ERR, "ssl_error() ret=%zd SSL_ERROR_WANT_WRITE", ret);
break;
case SSL_ERROR_SYSCALL:
if (ret == 0 && ERR_peek_error() == 0) {
upslogx(LOG_ERR, "ssl_error() EOF from client");
} else {
upslogx(LOG_ERR, "ssl_error() ret=%zd SSL_ERROR_SYSCALL", ret);
}
break;
default:
upslogx(LOG_ERR, "ssl_error() ret=%zd SSL_ERROR %d", ret, e);
ssl_debug();
}
return -1;
}
#elif defined(WITH_NSS) /* WITH_OPENSSL */
static char *nss_password_callback(PK11SlotInfo *slot, PRBool retry,
void *arg)
{
NUT_UNUSED_VARIABLE(retry);
NUT_UNUSED_VARIABLE(arg);
upslogx(LOG_INFO, "Intend to retrieve password for %s / %s: password %sconfigured",
PK11_GetSlotName(slot), PK11_GetTokenName(slot), nsscertpasswd?"":"not ");
return nsscertpasswd ? PL_strdup(nsscertpasswd) : NULL;
}
static void nss_error(const char* funcname)
{
char buffer[SMALLBUF];
PRInt32 length = PR_GetErrorText(buffer);
if (length > 0 && length < SMALLBUF) {
upsdebugx(1, "nss_error %ld in %s : %s", (long)PR_GetError(), funcname, buffer);
}else{
upsdebugx(1, "nss_error %ld in %s", (long)PR_GetError(), funcname);
}
}
static SECStatus AuthCertificate(CERTCertDBHandle *arg, PRFileDesc *fd,
PRBool checksig, PRBool isServer)
{
UPSCONN_t *ups = (UPSCONN_t *)SSL_RevealPinArg(fd);
SECStatus status = SSL_AuthCertificate(arg, fd, checksig, isServer);
upslogx(LOG_INFO, "Intend to authenticate server %s : %s",
ups?ups->host:"<unnamed>",
status==SECSuccess?"SUCCESS":"FAILED");
if (status != SECSuccess) {
nss_error("SSL_AuthCertificate");
}
return status;
}
static SECStatus AuthCertificateDontVerify(CERTCertDBHandle *arg, PRFileDesc *fd,
PRBool checksig, PRBool isServer)
{
UPSCONN_t *ups = (UPSCONN_t *)SSL_RevealPinArg(fd);
NUT_UNUSED_VARIABLE(arg);
NUT_UNUSED_VARIABLE(checksig);
NUT_UNUSED_VARIABLE(isServer);
upslogx(LOG_INFO, "Do not intend to authenticate server %s",
ups?ups->host:"<unnamed>");
return SECSuccess;
}
static SECStatus BadCertHandler(UPSCONN_t *arg, PRFileDesc *fd)
{
HOST_CERT_t* cert;
NUT_UNUSED_VARIABLE(fd);
upslogx(LOG_WARNING, "Certificate validation failed for %s",
(arg&&arg->host)?arg->host:"<unnamed>");
/* BadCertHandler is called when the NSS certificate validation is failed.
* If the certificate verification (user conf) is mandatory, reject authentication
* else accept it.
*/
cert = upscli_find_host_cert(arg->host);
if (cert != NULL) {
return cert->certverify==0 ? SECSuccess : SECFailure;
} else {
return verify_certificate==0 ? SECSuccess : SECFailure;
}
}
static SECStatus GetClientAuthData(UPSCONN_t *arg, PRFileDesc *fd,
CERTDistNames *caNames, CERTCertificate **pRetCert, SECKEYPrivateKey **pRetKey)
{
CERTCertificate *cert;
SECKEYPrivateKey *privKey;
SECStatus status = NSS_GetClientAuthData(arg, fd, caNames, pRetCert, pRetKey);
if (status == SECFailure) {
if (nsscertname != NULL) {
cert = PK11_FindCertFromNickname(nsscertname, NULL);
if(cert==NULL) {
upslogx(LOG_ERR, "Can not find self-certificate");
nss_error("GetClientAuthData / PK11_FindCertFromNickname");
}else{
privKey = PK11_FindKeyByAnyCert(cert, NULL);
if(privKey==NULL){
upslogx(LOG_ERR, "Can not find private key related to self-certificate");
nss_error("GetClientAuthData / PK11_FindKeyByAnyCert");
}else{
*pRetCert = cert;
*pRetKey = privKey;
status = SECSuccess;
}
}
} else {
upslogx(LOG_ERR, "Self-certificate name not configured");
}
}
return status;
}
static void HandshakeCallback(PRFileDesc *fd, UPSCONN_t *client_data)
{
NUT_UNUSED_VARIABLE(fd);
upslogx(LOG_INFO, "SSL handshake done successfully with server %s",
client_data->host);
}
#endif /* WITH_OPENSSL | WITH_NSS */
int upscli_init(int certverify, const char *certpath,
const char *certname, const char *certpasswd)
{
#ifdef WITH_OPENSSL
int ret, ssl_mode = SSL_VERIFY_NONE;
NUT_UNUSED_VARIABLE(certname);
NUT_UNUSED_VARIABLE(certpasswd);
#elif defined(WITH_NSS) /* WITH_OPENSSL */
SECStatus status;
#else
NUT_UNUSED_VARIABLE(certverify);
NUT_UNUSED_VARIABLE(certpath);
NUT_UNUSED_VARIABLE(certname);
NUT_UNUSED_VARIABLE(certpasswd);
#endif /* WITH_OPENSSL | WITH_NSS */
if (upscli_initialized == 1) {
upslogx(LOG_WARNING, "upscli already initialized");
return -1;
}
#ifdef WITH_OPENSSL
#if OPENSSL_VERSION_NUMBER < 0x10100000L
SSL_load_error_strings();
SSL_library_init();
ssl_ctx = SSL_CTX_new(SSLv23_client_method());
#else
ssl_ctx = SSL_CTX_new(TLS_client_method());
#endif
if (!ssl_ctx) {
upslogx(LOG_ERR, "Can not initialize SSL context");
return -1;
}
#if OPENSSL_VERSION_NUMBER < 0x10100000L
/* set minimum protocol TLSv1 */
SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
#else
ret = SSL_CTX_set_min_proto_version(ssl_ctx, TLS1_VERSION);
if (ret != 1) {
upslogx(LOG_ERR, "Can not set minimum protocol to TLSv1");
return -1;
}
#endif
if (!certpath) {
if (certverify == 1) {
upslogx(LOG_ERR, "Can not verify certificate if any is specified");
return -1; /* Failed : cert is mandatory but no certfile */
}
} else {
switch(certverify) {
case 0:
ssl_mode = SSL_VERIFY_NONE;
break;
default:
ssl_mode = SSL_VERIFY_PEER;
break;
}
ret = SSL_CTX_load_verify_locations(ssl_ctx, NULL, certpath);
if (ret != 1) {
upslogx(LOG_ERR, "Failed to load certificate from pemfile %s", certpath);
return -1;
}
SSL_CTX_set_verify(ssl_ctx, ssl_mode, NULL);
}
#elif defined(WITH_NSS) /* WITH_OPENSSL */
PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
PK11_SetPasswordFunc(nss_password_callback);
if (certpath) {
upslogx(LOG_INFO, "Init SSL with cerificate database located at %s", certpath);
status = NSS_Init(certpath);
} else {
upslogx(LOG_NOTICE, "Init SSL without certificate database");
status = NSS_NoDB_Init(NULL);
}
if (status != SECSuccess) {
upslogx(LOG_ERR, "Can not initialize SSL context");
nss_error("upscli_init / NSS_[NoDB]_Init");
return -1;
}
status = NSS_SetDomesticPolicy();
if (status != SECSuccess) {
upslogx(LOG_ERR, "Can not initialize SSL policy");
nss_error("upscli_init / NSS_SetDomesticPolicy");
return -1;
}
SSL_ClearSessionCache();
status = SSL_OptionSetDefault(SSL_ENABLE_SSL3, PR_TRUE);
if (status != SECSuccess) {
upslogx(LOG_ERR, "Can not enable SSLv3");
nss_error("upscli_init / SSL_OptionSetDefault(SSL_ENABLE_SSL3)");
return -1;
}
status = SSL_OptionSetDefault(SSL_ENABLE_TLS, PR_TRUE);
if (status != SECSuccess) {
upslogx(LOG_ERR, "Can not enable TLSv1");
nss_error("upscli_init / SSL_OptionSetDefault(SSL_ENABLE_TLS)");
return -1;
}
status = SSL_OptionSetDefault(SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
if (status != SECSuccess) {
upslogx(LOG_ERR, "Can not disable SSLv2 hello compatibility");
nss_error("upscli_init / SSL_OptionSetDefault(SSL_V2_COMPATIBLE_HELLO)");
return -1;
}
if (certname) {
nsscertname = xstrdup(certname);
}
if (certpasswd) {
nsscertpasswd = xstrdup(certpasswd);
}
verify_certificate = certverify;
#else
/* Note: historically we do not return with error here,
* just fall through to below and treat as initialized.
*/
upslogx(LOG_ERR, "upscli_init called but SSL wasn't compiled in");
#endif /* WITH_OPENSSL | WITH_NSS */
upscli_initialized = 1;
return 1;
}
void upscli_add_host_cert(const char* hostname, const char* certname, int certverify, int forcessl)
{
#ifdef WITH_NSS
HOST_CERT_t* cert = xmalloc(sizeof(HOST_CERT_t));
cert->next = first_host_cert;
cert->host = xstrdup(hostname);
cert->certname = xstrdup(certname);
cert->certverify = certverify;
cert->forcessl = forcessl;
first_host_cert = cert;
#else
NUT_UNUSED_VARIABLE(hostname);
NUT_UNUSED_VARIABLE(certname);
NUT_UNUSED_VARIABLE(certverify);
NUT_UNUSED_VARIABLE(forcessl);
#endif /* WITH_NSS */
}
static HOST_CERT_t* upscli_find_host_cert(const char* hostname)
{
#ifdef WITH_NSS
HOST_CERT_t* cert = first_host_cert;
if (hostname != NULL) {
while (cert != NULL) {
if (cert->host != NULL && strcmp(cert->host, hostname)==0 ) {
return cert;
}
cert = cert->next;
}
}
#else
NUT_UNUSED_VARIABLE(hostname);
#endif /* WITH_NSS */
return NULL;
}
int upscli_cleanup(void)
{
#ifdef WITH_OPENSSL
if (ssl_ctx) {
SSL_CTX_free(ssl_ctx);
ssl_ctx = NULL;
}
#endif /* WITH_OPENSSL */
#ifdef WITH_NSS
/* Called to force cache clearing to prevent NSS shutdown failures.
* http://www.mozilla.org/projects/security/pki/nss/ref/ssl/sslfnc.html#1138601
*/
SSL_ClearSessionCache();
NSS_Shutdown();
PR_Cleanup();
/* Called to release memory arena used by NSS/NSPR.
* Prevent to show all PL_ArenaAllocate mem alloc as leaks.
* https://developer.mozilla.org/en/NSS_Memory_allocation
*/
PL_ArenaFinish();
#endif /* WITH_NSS */
upscli_initialized = 0;
return 1;
}
const char *upscli_strerror(UPSCONN_t *ups)
{
#ifdef WITH_OPENSSL
unsigned long err;
char sslbuf[UPSCLI_ERRBUF_LEN];
#endif
#ifdef HAVE_PRAGMAS_FOR_GCC_DIAGNOSTIC_IGNORED_FORMAT_NONLITERAL
#pragma GCC diagnostic push
#endif
#ifdef HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_FORMAT_NONLITERAL
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
#endif
#ifdef HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_FORMAT_SECURITY
#pragma GCC diagnostic ignored "-Wformat-security"
#endif
if (!ups) {
return upscli_errlist[UPSCLI_ERR_INVALIDARG].str;
}
if (ups->upsclient_magic != UPSCLIENT_MAGIC) {
return upscli_errlist[UPSCLI_ERR_INVALIDARG].str;
}
if (ups->upserror > UPSCLI_ERR_MAX) {
return "Invalid error number";
}
switch (upscli_errlist[ups->upserror].flags) {
case 0: /* simple error */
return upscli_errlist[ups->upserror].str;
case 1: /* add message from system's strerror */
snprintf(ups->errbuf, UPSCLI_ERRBUF_LEN,
upscli_errlist[ups->upserror].str,
strerror(ups->syserrno));
return ups->errbuf;
case 2: /* SSL error */
#ifdef WITH_OPENSSL
err = ERR_get_error();
if (err) {
ERR_error_string(err, sslbuf);
snprintf(ups->errbuf, UPSCLI_ERRBUF_LEN,
upscli_errlist[ups->upserror].str,
sslbuf);
} else {
snprintf(ups->errbuf, UPSCLI_ERRBUF_LEN,
upscli_errlist[ups->upserror].str,
"peer disconnected");
}
#elif defined(WITH_NSS) /* WITH_OPENSSL */
if (PR_GetErrorTextLength() < UPSCLI_ERRBUF_LEN) {
PR_GetErrorText(ups->errbuf);
} else {
snprintf(ups->errbuf, UPSCLI_ERRBUF_LEN,
"SSL error #%ld, message too long to be displayed",
(long)PR_GetError());
}
#else
snprintf(ups->errbuf, UPSCLI_ERRBUF_LEN,
"SSL error, but SSL wasn't enabled at compile-time");
#endif /* WITH_OPENSSL | WITH_NSS */
return ups->errbuf;
case 3: /* parsing (parseconf) error */
snprintf(ups->errbuf, UPSCLI_ERRBUF_LEN,
upscli_errlist[ups->upserror].str,
ups->pc_ctx.errmsg);
return ups->errbuf;
}
#ifdef HAVE_PRAGMAS_FOR_GCC_DIAGNOSTIC_IGNORED_FORMAT_NONLITERAL
#pragma GCC diagnostic pop
#endif
/* fallthrough */
snprintf(ups->errbuf, UPSCLI_ERRBUF_LEN, "Unknown error flag %d",
upscli_errlist[ups->upserror].flags);
return ups->errbuf;
}
/* Read up to buflen bytes from fd and return the number of bytes
read. If no data is available within d_sec + d_usec, return 0.
On error, a value < 0 is returned (errno indicates error). */
static ssize_t upscli_select_read(const int fd, void *buf, const size_t buflen, const time_t d_sec, const suseconds_t d_usec)
{
ssize_t ret;
fd_set fds;
struct timeval tv;
FD_ZERO(&fds);
FD_SET(fd, &fds);
tv.tv_sec = d_sec;
tv.tv_usec = d_usec;
ret = select(fd + 1, &fds, NULL, NULL, &tv);
if (ret < 1) {
return ret;
}
return read(fd, buf, buflen);
}
#if (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_PUSH_POP_BESIDEFUNC) && ( (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_TYPE_LIMITS_BESIDEFUNC) || (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_TAUTOLOGICAL_CONSTANT_OUT_OF_RANGE_COMPARE_BESIDEFUNC) )
# pragma GCC diagnostic push
#endif
#ifdef HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_TYPE_LIMITS_BESIDEFUNC
# pragma GCC diagnostic ignored "-Wtype-limits"
#endif
#ifdef HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_TAUTOLOGICAL_CONSTANT_OUT_OF_RANGE_COMPARE_BESIDEFUNC
# pragma GCC diagnostic ignored "-Wtautological-constant-out-of-range-compare"
#endif
/* internal: abstract the SSL calls for the other functions */
static ssize_t net_read(UPSCONN_t *ups, char *buf, size_t buflen, const long timeout)
{
ssize_t ret = -1;
#ifdef WITH_SSL
if (ups->ssl) {
#ifdef WITH_OPENSSL
/* SSL_* routines deal with int type for return and buflen
* We might need to window our I/O if we exceed 2GB (in
* 32-bit builds)... Not likely to exceed in 64-bit builds,
* but smaller systems with 16-bits might be endangered :)
*/
assert(buflen <= INT_MAX);
int iret = SSL_read(ups->ssl, buf, (int)buflen);
assert(iret <= SSIZE_MAX);
ret = (ssize_t)iret;
#elif defined(WITH_NSS) /* WITH_OPENSSL */
/* PR_* routines deal in PRInt32 type
* We might need to window our I/O if we exceed 2GB :) */
assert(buflen <= PR_INT32_MAX);
ret = PR_Read(ups->ssl, buf, (PRInt32)buflen);
#endif /* WITH_OPENSSL | WITH_NSS*/
if (ret < 1) {
ups->upserror = UPSCLI_ERR_SSLERR;
}
return ret;
}
#endif
ret = upscli_select_read(ups->fd, buf, buflen, timeout, 0);
/* error reading data, server disconnected? */
if (ret < 0) {
ups->upserror = UPSCLI_ERR_READ;
ups->syserrno = errno;
}
/* no data available, server disconnected? */
if (ret == 0) {
ups->upserror = UPSCLI_ERR_SRVDISC;
}
return ret;
}
#if (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_PUSH_POP_BESIDEFUNC) && ( (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_TYPE_LIMITS_BESIDEFUNC) || (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_TAUTOLOGICAL_CONSTANT_OUT_OF_RANGE_COMPARE_BESIDEFUNC) )
# pragma GCC diagnostic pop
#endif
/* Write up to buflen bytes to fd and return the number of bytes
written. If no data is available within d_sec + d_usec, return 0.
On error, a value < 0 is returned (errno indicates error). */
static ssize_t upscli_select_write(const int fd, const void *buf, const size_t buflen, const time_t d_sec, const suseconds_t d_usec)
{
ssize_t ret;
fd_set fds;
struct timeval tv;
FD_ZERO(&fds);
FD_SET(fd, &fds);
tv.tv_sec = d_sec;
tv.tv_usec = d_usec;
ret = select(fd + 1, NULL, &fds, NULL, &tv);
if (ret < 1) {
return ret;
}
return write(fd, buf, buflen);
}
#if (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_PUSH_POP_BESIDEFUNC) && ( (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_TYPE_LIMITS_BESIDEFUNC) || (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_TAUTOLOGICAL_CONSTANT_OUT_OF_RANGE_COMPARE_BESIDEFUNC) )
# pragma GCC diagnostic push
#endif
#ifdef HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_TYPE_LIMITS_BESIDEFUNC
# pragma GCC diagnostic ignored "-Wtype-limits"
#endif
#ifdef HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_TAUTOLOGICAL_CONSTANT_OUT_OF_RANGE_COMPARE_BESIDEFUNC
# pragma GCC diagnostic ignored "-Wtautological-constant-out-of-range-compare"
#endif
/* internal: abstract the SSL calls for the other functions */
static ssize_t net_write(UPSCONN_t *ups, const char *buf, size_t buflen, const long timeout)
{
ssize_t ret = -1;
#ifdef WITH_SSL
if (ups->ssl) {
#ifdef WITH_OPENSSL
/* SSL_* routines deal with int type for return and buflen
* We might need to window our I/O if we exceed 2GB (in
* 32-bit builds)... Not likely to exceed in 64-bit builds,
* but smaller systems with 16-bits might be endangered :)
*/
assert(buflen <= INT_MAX);
int iret = SSL_write(ups->ssl, buf, (int)buflen);
assert(iret <= SSIZE_MAX);
ret = (ssize_t)iret;
#elif defined(WITH_NSS) /* WITH_OPENSSL */
/* PR_* routines deal in PRInt32 type
* We might need to window our I/O if we exceed 2GB :) */
assert(buflen <= PR_INT32_MAX);
ret = PR_Write(ups->ssl, buf, (PRInt32)buflen);
#endif /* WITH_OPENSSL | WITH_NSS */
if (ret < 1) {
ups->upserror = UPSCLI_ERR_SSLERR;
}
return ret;
}
#endif
ret = upscli_select_write(ups->fd, buf, buflen, timeout, 0);
/* error writing data, server disconnected? */
if (ret < 0) {
ups->upserror = UPSCLI_ERR_WRITE;
ups->syserrno = errno;
}
/* not ready for writing, server disconnected? */
if (ret == 0) {
ups->upserror = UPSCLI_ERR_SRVDISC;
}
return ret;
}
#if (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_PUSH_POP_BESIDEFUNC) && ( (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_TYPE_LIMITS_BESIDEFUNC) || (defined HAVE_PRAGMA_GCC_DIAGNOSTIC_IGNORED_TAUTOLOGICAL_CONSTANT_OUT_OF_RANGE_COMPARE_BESIDEFUNC) )
# pragma GCC diagnostic pop
#endif
#ifdef WITH_SSL
/*
* 1 : OK
* -1 : ERROR
* 0 : SSL NOT SUPPORTED
*/
static int upscli_sslinit(UPSCONN_t *ups, int verifycert)
{
#ifdef WITH_OPENSSL
int res;
#elif defined(WITH_NSS) /* WITH_OPENSSL */
SECStatus status;
PRFileDesc *socket;
HOST_CERT_t *cert;
#endif /* WITH_OPENSSL | WITH_NSS */
char buf[UPSCLI_NETBUF_LEN];
/* Intend to initialize upscli with no ssl db if not already done.
* Compatibility stuff for old clients which do not initialize them.
*/
if (upscli_initialized==0) {
upsdebugx(3, "upscli not initialized, "
"force initialisation without SSL configuration");
upscli_init(0, NULL, NULL, NULL);
}
/* see if upsd even talks SSL/TLS */
snprintf(buf, sizeof(buf), "STARTTLS\n");
if (upscli_sendline(ups, buf, strlen(buf)) != 0) {
return -1;
}
if (upscli_readline(ups, buf, sizeof(buf)) != 0) {
return -1;
}
if (strncmp(buf, "OK STARTTLS", 11) != 0) {
return 0; /* not supported */
}
/* upsd is happy, so let's crank up the client */
#ifdef WITH_OPENSSL
if (!ssl_ctx) {
upsdebugx(3, "SSL context is not available");
return 0;
}
ups->ssl = SSL_new(ssl_ctx);
if (!ups->ssl) {
upsdebugx(3, "Can not create SSL socket");
return 0;
}
if (SSL_set_fd(ups->ssl, ups->fd) != 1) {
upsdebugx(3, "Can not bind file descriptor to SSL socket");
return -1;
}
if (verifycert != 0) {
SSL_set_verify(ups->ssl, SSL_VERIFY_PEER, NULL);
} else {
SSL_set_verify(ups->ssl, SSL_VERIFY_NONE, NULL);
}
res = SSL_connect(ups->ssl);
switch(res)
{
case 1:
upsdebugx(3, "SSL connected (%s)", SSL_get_version(ups->ssl));
break;
case 0:
upslog_with_errno(1, "SSL_connect do not accept handshake.");
ssl_error(ups->ssl, res);
return -1;
default:
upslog_with_errno(1, "Unknown return value from SSL_connect %d", res);
ssl_error(ups->ssl, res);
return -1;
}
return 1;
#elif defined(WITH_NSS) /* WITH_OPENSSL */
socket = PR_ImportTCPSocket(ups->fd);
if (socket == NULL){
nss_error("upscli_sslinit / PR_ImportTCPSocket");
return -1;
}
ups->ssl = SSL_ImportFD(NULL, socket);
if (ups->ssl == NULL){
nss_error("upscli_sslinit / SSL_ImportFD");
return -1;
}
if (SSL_SetPKCS11PinArg(ups->ssl, ups) == -1){
nss_error("upscli_sslinit / SSL_SetPKCS11PinArg");
return -1;
}
if (verifycert) {
status = SSL_AuthCertificateHook(ups->ssl,
(SSLAuthCertificate)AuthCertificate, CERT_GetDefaultCertDB());
} else {
status = SSL_AuthCertificateHook(ups->ssl,
(SSLAuthCertificate)AuthCertificateDontVerify, CERT_GetDefaultCertDB());
}
if (status != SECSuccess) {
nss_error("upscli_sslinit / SSL_AuthCertificateHook");
return -1;
}
status = SSL_BadCertHook(ups->ssl, (SSLBadCertHandler)BadCertHandler, ups);
if (status != SECSuccess) {
nss_error("upscli_sslinit / SSL_BadCertHook");
return -1;
}
status = SSL_GetClientAuthDataHook(ups->ssl, (SSLGetClientAuthData)GetClientAuthData, ups);
if (status != SECSuccess) {
nss_error("upscli_sslinit / SSL_GetClientAuthDataHook");
return -1;
}
status = SSL_HandshakeCallback(ups->ssl, (SSLHandshakeCallback)HandshakeCallback, ups);
if (status != SECSuccess) {
nss_error("upscli_sslinit / SSL_HandshakeCallback");
return -1;
}
cert = upscli_find_host_cert(ups->host);
if (cert != NULL && cert->certname != NULL) {
upslogx(LOG_INFO, "Connecting in SSL to '%s' and look at certificate called '%s'",
ups->host, cert->certname);
status = SSL_SetURL(ups->ssl, cert->certname);
} else {
upslogx(LOG_NOTICE, "Connecting in SSL to '%s' (no certificate name specified)", ups->host);
status = SSL_SetURL(ups->ssl, ups->host);
}
if (status != SECSuccess) {
nss_error("upscli_sslinit / SSL_SetURL");
return -1;
}
status = SSL_ResetHandshake(ups->ssl, PR_FALSE);
if (status != SECSuccess) {
nss_error("upscli_sslinit / SSL_ResetHandshake");
ups->ssl = NULL;
/* EKI wtf unimport or free the socket ? */
return -1;
}
status = SSL_ForceHandshake(ups->ssl);
if (status != SECSuccess) {
nss_error("upscli_sslinit / SSL_ForceHandshake");
ups->ssl = NULL;
/* EKI wtf unimport or free the socket ? */
/* TODO : Close the connection. */
return -1;
}
return 1;
#endif /* WITH_OPENSSL | WITH_NSS */
}
#else /* WITH_SSL */
static int upscli_sslinit(UPSCONN_t *ups, int verifycert)
{
NUT_UNUSED_VARIABLE(ups);
NUT_UNUSED_VARIABLE(verifycert);
return 0; /* not supported */
}
#endif /* WITH_SSL */
int upscli_tryconnect(UPSCONN_t *ups, const char *host, int port, int flags,struct timeval * timeout)
{
int sock_fd;
struct addrinfo hints, *res, *ai;
char sport[NI_MAXSERV];
int v, certverify, tryssl, forcessl, ret;
HOST_CERT_t* hostcert;
fd_set wfds;
int error;
socklen_t error_size;
long fd_flags;
if (!ups) {
return -1;
}
/* clear out any lingering junk */
memset(ups, 0, sizeof(*ups));
ups->upsclient_magic = UPSCLIENT_MAGIC;
ups->fd = -1;
if (!host) {
ups->upserror = UPSCLI_ERR_NOSUCHHOST;
return -1;
}
snprintf(sport, sizeof(sport), "%hu", (unsigned short int)port);
memset(&hints, 0, sizeof(hints));
if (flags & UPSCLI_CONN_INET6) {
hints.ai_family = AF_INET6;
} else if (flags & UPSCLI_CONN_INET) {
hints.ai_family = AF_INET;
} else {
hints.ai_family = AF_UNSPEC;
}
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
while ((v = getaddrinfo(host, sport, &hints, &res)) != 0) {
switch (v)
{
case EAI_AGAIN:
continue;
case EAI_NONAME:
ups->upserror = UPSCLI_ERR_NOSUCHHOST;
return -1;
case EAI_MEMORY:
ups->upserror = UPSCLI_ERR_NOMEM;