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Add support for chained SSL certificates.

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git-svn-id: https://shellinabox.googlecode.com/svn/trunk@90 0da03de8-d603-11dd-86c2-0f8696b7b6f9
This commit is contained in:
zodiac 2009-03-29 21:52:18 +00:00
parent 2f6b0934ee
commit 1ea698ad72
6 changed files with 301 additions and 194 deletions
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2
config.h
View file

@ -95,7 +95,7 @@
#define STDC_HEADERS 1
/* Most recent revision number in the version control system */
#define VCS_REVISION "89"
#define VCS_REVISION "90"
/* Version number of package */
#define VERSION "2.5"

2
configure vendored
View file

@ -2055,7 +2055,7 @@ ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $
ac_compiler_gnu=$ac_cv_c_compiler_gnu
VCS_REVISION=89
VCS_REVISION=90
cat >>confdefs.h <<_ACEOF

2
configure.ac
View file

@ -2,7 +2,7 @@ AC_PREREQ(2.57)
dnl This is the one location where the authoritative version number is stored
AC_INIT(shellinabox, 2.5, markus@shellinabox.com)
VCS_REVISION=89
VCS_REVISION=90
AC_SUBST(VCS_REVISION)
AC_DEFINE_UNQUOTED(VCS_REVISION, "${VCS_REVISION}",
[Most recent revision number in the version control system])

458
libhttp/ssl.c
View file

@ -48,10 +48,13 @@
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "libhttp/ssl.h"
@ -116,6 +119,8 @@ int (*SSL_set_ex_data)(SSL *, int, void *);
int (*SSL_shutdown)(SSL *);
int (*SSL_write)(SSL *, const void *, int);
SSL_METHOD * (*SSLv23_server_method)(void);
X509 * (*d2i_X509)(X509 **px, const unsigned char **in, int len);
void (*X509_free)(X509 *a);
#endif
static void sslDestroyCachedContext(void *ssl_, char *context_) {
@ -235,7 +240,9 @@ static void loadSSL(void) {
{ { &SSL_set_ex_data }, "SSL_set_ex_data" },
{ { &SSL_shutdown }, "SSL_shutdown" },
{ { &SSL_write }, "SSL_write" },
{ { &SSLv23_server_method }, "SSLv23_server_method" }
{ { &SSLv23_server_method }, "SSLv23_server_method" },
{ { &d2i_X509 }, "d2i_X509" },
{ { &X509_free }, "X509_free" }
};
for (int i = 0; i < sizeof(symbols)/sizeof(symbols[0]); i++) {
if (!(*symbols[i].var = loadSymbol("libssl.so", symbols[i].fn))) {
@ -301,146 +308,7 @@ static void sslGenerateCertificate(const char *certificate,
}
free(cmd);
}
#endif
#ifdef HAVE_TLSEXT
static int sslSNICallback(SSL *sslHndl, int *al, struct SSLSupport *ssl) {
check(!ERR_peek_error());
const char *name = SSL_get_servername(sslHndl,
TLSEXT_NAMETYPE_host_name);
if (name == NULL || !*name) {
return SSL_TLSEXT_ERR_OK;
}
struct HttpConnection *http =
(struct HttpConnection *)SSL_get_app_data(sslHndl);
debug("Received SNI callback for virtual host \"%s\" from \"%s:%d\"",
name, httpGetPeerName(http), httpGetPort(http));
char *serverName;
check(serverName = malloc(strlen(name)+2));
serverName[0] = '-';
for (int i = 0;;) {
char ch = name[i];
if (ch >= 'A' && ch <= 'Z') {
ch |= 0x20;
} else if (ch != '\000' && ch != '.' && ch != '-' &&
(ch < '0' ||(ch > '9' && ch < 'A') || (ch > 'Z' &&
ch < 'a')|| ch > 'z')) {
i++;
continue;
}
serverName[++i] = ch;
if (!ch) {
break;
}
}
if (!*serverName) {
free(serverName);
return SSL_TLSEXT_ERR_OK;
}
SSL_CTX *context = (SSL_CTX *)getFromTrie(&ssl->sniContexts,
serverName+1,
NULL);
if (context == NULL) {
check(context = SSL_CTX_new(SSLv23_server_method()));
check(ssl->sniCertificatePattern);
char *certificate = stringPrintfUnchecked(NULL,
ssl->sniCertificatePattern,
serverName);
if (!SSL_CTX_use_certificate_file(context, certificate, SSL_FILETYPE_PEM)||
!SSL_CTX_use_PrivateKey_file(context, certificate, SSL_FILETYPE_PEM) ||
!SSL_CTX_check_private_key(context)) {
if (ssl->generateMissing) {
sslGenerateCertificate(certificate, serverName + 1);
if (!SSL_CTX_use_certificate_file(context, certificate,
SSL_FILETYPE_PEM) ||
!SSL_CTX_use_PrivateKey_file(context, certificate,
SSL_FILETYPE_PEM) ||
!SSL_CTX_check_private_key(context)) {
goto certificate_missing;
}
} else {
certificate_missing:
warn("Could not find matching certificate \"%s\" for \"%s\"",
certificate, serverName + 1);
SSL_CTX_free(context);
context = ssl->sslContext;
}
}
ERR_clear_error();
free(certificate);
addToTrie(&ssl->sniContexts, serverName+1, (char *)context);
}
free(serverName);
if (context != ssl->sslContext) {
check(SSL_set_SSL_CTX(sslHndl, context) > 0);
}
check(!ERR_peek_error());
return SSL_TLSEXT_ERR_OK;
}
#endif
void sslSetCertificate(struct SSLSupport *ssl, const char *filename,
int autoGenerateMissing) {
#if defined(HAVE_OPENSSL)
check(serverSupportsSSL());
char *defaultCertificate;
check(defaultCertificate = strdup(filename));
char *ptr = strchr(defaultCertificate, '%');
if (ptr != NULL) {
check(!strchr(ptr+1, '%'));
check(ptr[1] == 's');
memmove(ptr, ptr + 2, strlen(ptr)-1);
}
check(ssl->sslContext = SSL_CTX_new(SSLv23_server_method()));
if (autoGenerateMissing) {
if (!SSL_CTX_use_certificate_file(ssl->sslContext, defaultCertificate,
SSL_FILETYPE_PEM) ||
!SSL_CTX_use_PrivateKey_file(ssl->sslContext, defaultCertificate,
SSL_FILETYPE_PEM) ||
!SSL_CTX_check_private_key(ssl->sslContext)) {
char hostname[256], buf[4096];
check(!gethostname(hostname, sizeof(hostname)));
struct hostent he_buf, *he;
int h_err;
if (gethostbyname_r(hostname, &he_buf, buf, sizeof(buf),
&he, &h_err)) {
sslGenerateCertificate(defaultCertificate, hostname);
} else {
sslGenerateCertificate(defaultCertificate, he->h_name);
}
} else {
goto valid_certificate;
}
}
if (!SSL_CTX_use_certificate_file(ssl->sslContext, defaultCertificate,
SSL_FILETYPE_PEM) ||
!SSL_CTX_use_PrivateKey_file(ssl->sslContext, defaultCertificate,
SSL_FILETYPE_PEM) ||
!SSL_CTX_check_private_key(ssl->sslContext)) {
fatal("Cannot read valid certificate from \"%s\". "
"Check file permissions and file format.", defaultCertificate);
}
valid_certificate:
free(defaultCertificate);
#ifdef HAVE_TLSEXT
if (ptr != NULL) {
check(ssl->sniCertificatePattern = strdup(filename));
check(SSL_CTX_set_tlsext_servername_callback(ssl->sslContext,
sslSNICallback));
check(SSL_CTX_set_tlsext_servername_arg(ssl->sslContext, ssl));
}
#endif
dcheck(!ERR_peek_error());
ERR_clear_error();
ssl->generateMissing = autoGenerateMissing;
#endif
}
#ifdef HAVE_OPENSSL
static const unsigned char *sslSecureReadASCIIFileToMem(int fd) {
size_t inc = 16384;
size_t bufSize = inc;
@ -476,8 +344,12 @@ static const unsigned char *sslSecureReadASCIIFileToMem(int fd) {
static const unsigned char *sslPEMtoASN1(const unsigned char *pem,
const char *record,
long *size) {
*size = -1;
long *size,
const unsigned char **eor) {
if (eor) {
*eor = NULL;
}
*size = 0;
char *marker;
check((marker = stringPrintf(NULL, "-----BEGIN %s-----",record))!=NULL);
unsigned char *ptr = (unsigned char *)strstr((char *)pem, marker);
@ -490,6 +362,9 @@ static const unsigned char *sslPEMtoASN1(const unsigned char *pem,
*marker = '\000';
check((marker = stringPrintf(marker, "-----END %s-----",record))!=NULL);
unsigned char *end = (unsigned char *)strstr((char *)ptr, marker);
if (eor) {
*eor = end + strlen(marker);
}
free(marker);
if (!end) {
return NULL;
@ -539,60 +414,261 @@ static const unsigned char *sslPEMtoASN1(const unsigned char *pem,
*size = out - ret;
return ret;
}
static int sslSetCertificateFromFd(SSL_CTX *context, int fd) {
int rc = 0;
check(serverSupportsSSL());
check(fd >= 0);
const unsigned char *data = sslSecureReadASCIIFileToMem(fd);
check(!NOINTR(close(fd)));
long dataSize = (long)strlen((const char *)data);
long certSize, rsaSize, dsaSize, ecSize;
const unsigned char *record;
const unsigned char *cert = sslPEMtoASN1(data, "CERTIFICATE", &certSize,
&record);
const unsigned char *rsa = sslPEMtoASN1(data, "RSA PRIVATE KEY",&rsaSize,
NULL);
const unsigned char *dsa = sslPEMtoASN1(data, "DSA PRIVATE KEY",&dsaSize,
NULL);
const unsigned char *ec = sslPEMtoASN1(data, "EC PRIVATE KEY", &ecSize,
NULL);
if (certSize && (rsaSize || dsaSize
#ifdef EVP_PKEY_EC
|| ecSize
#endif
) &&
SSL_CTX_use_certificate_ASN1(context, certSize, cert) &&
(!rsaSize ||
SSL_CTX_use_PrivateKey_ASN1(EVP_PKEY_RSA, context, rsa, rsaSize)) &&
(!dsaSize ||
SSL_CTX_use_PrivateKey_ASN1(EVP_PKEY_DSA, context, dsa, dsaSize))
#ifdef EVP_PKEY_EC
&&
(!ecSize ||
SSL_CTX_use_PrivateKey_ASN1(EVP_PKEY_EC, context, ec, ecSize))
#endif
) {
memset((char *)cert, 0, certSize);
free((char *)cert);
while (record) {
cert = sslPEMtoASN1(record, "CERTIFICATE", &certSize,
&record);
if (cert) {
X509 *x509;
const unsigned char *c = cert;
check(x509 = d2i_X509(NULL, &c, certSize));
memset((char *)cert, 0, certSize);
free((char *)cert);
if (!SSL_CTX_add_extra_chain_cert(context, x509)) {
X509_free(x509);
break;
}
}
}
if (!record && SSL_CTX_check_private_key(context)) {
rc = 1;
}
dcheck(!ERR_peek_error());
ERR_clear_error();
} else {
memset((char *)cert, 0, certSize);
free((char *)cert);
}
memset((char *)data, 0, dataSize);
free((char *)data);
memset((char *)rsa, 0, rsaSize);
free((char *)rsa);
memset((char *)dsa, 0, dsaSize);
free((char *)dsa);
memset((char *)ec, 0, ecSize);
free((char *)ec);
return rc;
}
static int sslSetCertificateFromFile(SSL_CTX *context,
const char *filename) {
int fd = open(filename, O_RDONLY);
if (fd < 0) {
return -1;
}
int rc = sslSetCertificateFromFd(context, fd);
NOINTR(close(fd));
return rc;
}
#endif
#ifdef HAVE_TLSEXT
static int sslSNICallback(SSL *sslHndl, int *al, struct SSLSupport *ssl) {
check(!ERR_peek_error());
const char *name = SSL_get_servername(sslHndl,
TLSEXT_NAMETYPE_host_name);
if (name == NULL || !*name) {
return SSL_TLSEXT_ERR_OK;
}
struct HttpConnection *http =
(struct HttpConnection *)SSL_get_app_data(sslHndl);
debug("Received SNI callback for virtual host \"%s\" from \"%s:%d\"",
name, httpGetPeerName(http), httpGetPort(http));
char *serverName;
check(serverName = malloc(strlen(name)+2));
serverName[0] = '-';
for (int i = 0;;) {
char ch = name[i];
if (ch >= 'A' && ch <= 'Z') {
ch |= 0x20;
} else if (ch != '\000' && ch != '.' && ch != '-' &&
(ch < '0' ||(ch > '9' && ch < 'A') || (ch > 'Z' &&
ch < 'a')|| ch > 'z')) {
i++;
continue;
}
serverName[++i] = ch;
if (!ch) {
break;
}
}
if (!*serverName) {
free(serverName);
return SSL_TLSEXT_ERR_OK;
}
SSL_CTX *context = (SSL_CTX *)getFromTrie(&ssl->sniContexts,
serverName+1,
NULL);
if (context == NULL) {
check(context = SSL_CTX_new(SSLv23_server_method()));
check(ssl->sniCertificatePattern);
char *certificate = stringPrintfUnchecked(NULL,
ssl->sniCertificatePattern,
serverName);
if (sslSetCertificateFromFile(context, certificate) < 0) {
if (ssl->generateMissing) {
sslGenerateCertificate(certificate, serverName + 1);
// No need to check the certificate. If we fail to set it, we will use
// the default certificate, instead.
sslSetCertificateFromFile(context, certificate);
} else {
warn("Could not find matching certificate \"%s\" for \"%s\"",
certificate, serverName + 1);
SSL_CTX_free(context);
context = ssl->sslContext;
}
}
ERR_clear_error();
free(certificate);
addToTrie(&ssl->sniContexts, serverName+1, (char *)context);
}
free(serverName);
if (context != ssl->sslContext) {
check(SSL_set_SSL_CTX(sslHndl, context) > 0);
}
check(!ERR_peek_error());
return SSL_TLSEXT_ERR_OK;
}
#endif
void sslSetCertificate(struct SSLSupport *ssl, const char *filename,
int autoGenerateMissing) {
#if defined(HAVE_OPENSSL)
check(serverSupportsSSL());
char *defaultCertificate;
check(defaultCertificate = strdup(filename));
char *ptr = strchr(defaultCertificate, '%');
if (ptr != NULL) {
check(!strchr(ptr+1, '%'));
check(ptr[1] == 's');
memmove(ptr, ptr + 2, strlen(ptr)-1);
}
// Try to set the default certificate. If necessary, (re-)generate it.
check(ssl->sslContext = SSL_CTX_new(SSLv23_server_method()));
if (autoGenerateMissing) {
if (sslSetCertificateFromFile(ssl->sslContext, defaultCertificate) < 0) {
char hostname[256], buf[4096];
check(!gethostname(hostname, sizeof(hostname)));
struct hostent he_buf, *he;
int h_err;
if (gethostbyname_r(hostname, &he_buf, buf, sizeof(buf),
&he, &h_err)) {
sslGenerateCertificate(defaultCertificate, hostname);
} else {
sslGenerateCertificate(defaultCertificate, he->h_name);
}
} else {
goto valid_certificate;
}
}
if (sslSetCertificateFromFile(ssl->sslContext, defaultCertificate) < 0) {
fatal("Cannot read valid certificate from \"%s\". "
"Check file permissions and file format.", defaultCertificate);
}
valid_certificate:
free(defaultCertificate);
// Enable SNI support so that we can set a different certificate, if the
// client asked for it.
#ifdef HAVE_TLSEXT
if (ptr != NULL) {
check(ssl->sniCertificatePattern = strdup(filename));
check(SSL_CTX_set_tlsext_servername_callback(ssl->sslContext,
sslSNICallback));
check(SSL_CTX_set_tlsext_servername_arg(ssl->sslContext, ssl));
}
#endif
dcheck(!ERR_peek_error());
ERR_clear_error();
ssl->generateMissing = autoGenerateMissing;
#endif
}
// Convert the file descriptor to a human-readable format. Attempts to
// retrieve the original file name where possible.
#ifdef HAVE_OPENSSL
static char *sslFdToFilename(int fd) {
char *proc, *buf;
int len = 128;
check(proc = stringPrintf(NULL, "/proc/self/fd/%d", fd));
check(buf = malloc(len));
for (;;) {
ssize_t i;
if ((i = readlink(proc, buf + 1, len-3)) < 0) {
free(proc);
free(buf);
check(buf = stringPrintf(NULL, "fd %d", fd));
return buf;
} else if (i >= len-3) {
len += 512;
check(buf = realloc(buf, len));
} else {
free(proc);
check(i >= 0 && i < len);
buf[i+1] = '\000';
struct stat sb;
if (!stat(buf + 1, &sb) && S_ISREG(sb.st_mode)) {
*buf = '"';
buf[i + 1] = '"';
buf[i + 2] = '\000';
return buf;
} else {
free(buf);
check(buf = stringPrintf(NULL, "fd %d", fd));
return buf;
}
}
}
}
#endif
void sslSetCertificateFd(struct SSLSupport *ssl, int fd) {
#ifdef HAVE_OPENSSL
check(serverSupportsSSL());
check(fd >= 0);
check(ssl->sslContext = SSL_CTX_new(SSLv23_server_method()));
const unsigned char *data = sslSecureReadASCIIFileToMem(fd);
check(!NOINTR(close(fd)));
long dataSize = (long)strlen((const char *)data);
long certSize, rsaSize, dsaSize, ecSize;
const unsigned char *cert = sslPEMtoASN1(data, "CERTIFICATE", &certSize);
const unsigned char *rsa = sslPEMtoASN1(data, "RSA PRIVATE KEY", &rsaSize);
const unsigned char *dsa = sslPEMtoASN1(data, "DSA PRIVATE KEY", &dsaSize);
const unsigned char *ec = sslPEMtoASN1(data, "EC PRIVATE KEY", &ecSize);
if (!certSize || !(rsaSize > 0 || dsaSize > 0
#ifdef EVP_PKEY_EC
|| ecSize > 0
#endif
) ||
!SSL_CTX_use_certificate_ASN1(ssl->sslContext, certSize, cert) ||
(rsaSize > 0 &&
!SSL_CTX_use_PrivateKey_ASN1(EVP_PKEY_RSA, ssl->sslContext, rsa,
rsaSize)) ||
(dsaSize > 0 &&
!SSL_CTX_use_PrivateKey_ASN1(EVP_PKEY_DSA, ssl->sslContext, dsa,
dsaSize)) ||
#ifdef EVP_PKEY_EC
(ecSize > 0 &&
!SSL_CTX_use_PrivateKey_ASN1(EVP_PKEY_EC, ssl->sslContext, ec,
ecSize)) ||
#endif
!SSL_CTX_check_private_key(ssl->sslContext)) {
fatal("Cannot read valid certificate from fd %d. Check file format.", fd);
check(ssl->sslContext = SSL_CTX_new(SSLv23_server_method()));
if (!sslSetCertificateFromFd(ssl->sslContext, fd)) {
fatal("Cannot read valid certificate from %s. Check file format.",
sslFdToFilename(fd));
}
dcheck(!ERR_peek_error());
ERR_clear_error();
memset((char *)data, 0, dataSize);
free((char *)data);
memset((char *)cert, 0, certSize);
free((char *)cert);
if (rsaSize > 0) {
memset((char *)rsa, 0, rsaSize);
free((char *)rsa);
}
if (dsaSize > 0) {
memset((char *)dsa, 0, dsaSize);
free((char *)dsa);
}
if (ecSize > 0) {
memset((char *)ec, 0, ecSize);
free((char *)ec);
}
ssl->generateMissing = 0;
ssl->generateMissing = 0;
#endif
}

4
libhttp/ssl.h
View file

@ -108,6 +108,8 @@ extern int (*x_SSL_set_ex_data)(SSL *, int, void *);
extern int (*x_SSL_shutdown)(SSL *);
extern int (*x_SSL_write)(SSL *, const void *, int);
extern SSL_METHOD *(*x_SSLv23_server_method)(void);
extern X509 * (*x_d2i_X509)(X509 **px, const unsigned char **in, int len);
extern void (*x_X509_free)(X509 *a);
#define BIO_ctrl x_BIO_ctrl
#define BIO_f_buffer x_BIO_f_buffer
@ -146,6 +148,8 @@ extern SSL_METHOD *(*x_SSLv23_server_method)(void);
#define SSL_shutdown x_SSL_shutdown
#define SSL_write x_SSL_write
#define SSLv23_server_method x_SSLv23_server_method
#define d2i_X509 x_d2i_X509
#define X509_free x_X509_free
#undef BIO_set_buffer_read_data
#undef SSL_CTX_set_tlsext_servername_arg

27
make-chained-cert.sh Executable file
View file

@ -0,0 +1,27 @@
#!/bin/bash -e
tmp=/tmp/make-chained-cert.$$
trap 'echo; tput bel; echo FAILURE; rm -rf "${tmp}"; exit 1' EXIT INT TERM QUIT
mkdir -p "${tmp}/demoCA/newcerts"
printf '%08x' $$ >"${tmp}/demoCA/serial"
touch "${tmp}/demoCA/index.txt"
cd "${tmp}"
openssl req -nodes -new -x509 -keyout "${tmp}/ca-key.pem" \
-out "${tmp}/ca-cert.pem" -days 7300 \
-subj "/CN=Demo CA/" 2>/dev/null
openssl x509 -in "${tmp}/ca-cert.pem" -out "${tmp}/ca-cert.crt" 2>/dev/null
openssl req -nodes -new -keyout /dev/stdout \
-out "${tmp}/ssl-req.pem" -days 7300 -subj "/CN=$(hostname -f)/" \
2>/dev/null | cat
openssl ca -batch -keyfile "${tmp}/ca-key.pem" -cert "${tmp}/ca-cert.crt" \
-notext -policy policy_anything -out /dev/stdout \
-infiles "${tmp}/ssl-req.pem" 2>/dev/null | cat
cat "${tmp}/ca-cert.crt"
trap 'rm -rf "${tmp}"' EXIT INT TERM QUIT
exit 0