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assl.c
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assl.c
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/*
* Copyright (c) 2009 Marco Peereboom <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include <fcntl.h>
#include <poll.h>
#include <signal.h>
#include <unistd.h>
#include <sys/stat.h>
#include <netdb.h>
#include <openssl/engine.h>
#include "assl.h"
#include "ssl_privsep.h"
#ifdef BUILDSTR
static const char *vertag = ASSL_VERSION " " BUILDSTR;
#else
static const char *vertag = ASSL_VERSION;
#endif
/* borrowed from openssl the tool */
static unsigned char assl_dh512_p[] = {
0xDA, 0x58, 0x3C, 0x16, 0xD9, 0x85, 0x22, 0x89, 0xD0, 0xE4, 0xAF, 0x75,
0x6F, 0x4C, 0xCA, 0x92, 0xDD, 0x4B, 0xE5, 0x33, 0xB8, 0x04, 0xFB, 0x0F,
0xED, 0x94, 0xEF, 0x9C, 0x8A, 0x44, 0x03, 0xED, 0x57, 0x46, 0x50, 0xD3,
0x69, 0x99, 0xDB, 0x29, 0xD7, 0x76, 0x27, 0x6B, 0xA2, 0xD3, 0xD4, 0x12,
0xE2, 0x18, 0xF4, 0xDD, 0x1E, 0x08, 0x4C, 0xF6, 0xD8, 0x00, 0x3E, 0x7C,
0x47, 0x74, 0xE8, 0x33,
};
static unsigned char assl_dh512_g[] = {
0x02,
};
/*
* XXX todo:
* XDR read/write
* LDAP integration for certs
* create CA certificate
* create machine certificates
* sign machine certificates
* keep stats on read/write performance and connection overhead
* come up with a scheme to deal with errors, < 0 for ssl and > 0 libc
* write proper regress tests
*/
#define ASSL_VERIFY_DEPTH (1)
#include "assl_internal.h"
/* set to stop assl_serve */
volatile sig_atomic_t assl_stop_serving;
/* set to indicate this is a child process */
pid_t assl_child;
static int assl_init;
static int assl_ctx_idx;
const char *
assl_verstring(void)
{
return vertag;
}
void
assl_version(int *major, int *minor, int *patch)
{
*major = ASSL_VERSION_MAJOR;
*minor = ASSL_VERSION_MINOR;
*patch = ASSL_VERSION_PATCH;
}
static void (*assl_log_fn)(int severity, const char *message) = NULL;
void
assl_set_log_callback(void (*cb)(int, const char *))
{
assl_log_fn = cb;
}
/* error handling */
#ifdef ASSL_NO_FANCY_ERRORS
__dead void
assl_fatalx(const char *s, ...)
{
char errmsg[1024];
va_list ap;
va_start(ap, s);
vsnprintf(errmsg, sizeof(errmsg), s, ap);
va_end(ap);
strlcat(errmsg, "\n", sizeof(errmsg));
if (assl_log_fn) {
(*assl_log_fn)(ASSL_LOG_WARN, errmsg);
} else {
fprintf(stderr, "%s", errmsg);
}
exit(1);
}
void
assl_warnx(const char *s, ...)
{
char errmsg[1024];
va_list ap;
va_start(ap, s);
snprintf(errmsg, sizeof(errmsg), s, ap);
va_end(ap);
if (assl_log_fn) {
(*assl_log_fn)(ASSL_LOG_ERR, errmsg);
} else {
fprintf(stderr, "%s\n", errmsg);
}
}
#else
SLIST_HEAD(assl_error_stack, assl_error);
/* XXX NOT concurrency safe! */
char assl_last_error[1024];
struct assl_error_stack aes = SLIST_HEAD_INITIALIZER(aes);
char *
assl_geterror(int et)
{
char *es;
switch (et) {
case ERR_LIBC:
strlcpy(assl_last_error, strerror(errno), sizeof
assl_last_error);
break;
case ERR_SSL:
es = (char *)ERR_lib_error_string(ERR_get_error());
if (es)
strlcpy(assl_last_error, es, sizeof assl_last_error);
else
strlcpy(assl_last_error, "unknown SSL error",
sizeof assl_last_error);
break;
case ERR_SOCKET:
assl_get_socket_error(errno, assl_last_error,
sizeof assl_last_error);
break;
default:
strlcpy(assl_last_error, "unknown error",
sizeof assl_last_error);
/* FALLTHROUGH */
case ERR_OWN:
break;
}
return (assl_last_error);
}
void
assl_push_error(const char *file, const char *func, int line, int et)
{
struct assl_error *ce;
if ((ce = calloc(1, sizeof *ce)) == NULL)
return;
if ((ce->errstr = strdup(assl_geterror(et))) == NULL) {
free(ce);
return;
}
ce->file = file;
ce->func = func;
ce->line = line;
SLIST_INSERT_HEAD(&aes, ce, link);
}
void
assl_err_stack_unwind(void)
{
struct assl_error *ce;
while(!SLIST_EMPTY(&aes)) {
ce = SLIST_FIRST(&aes);
SLIST_REMOVE_HEAD(&aes, link);
free(ce->errstr);
free(ce);
}
SLIST_INIT(&aes);
}
void
assl_err_own(char *s, ...)
{
va_list ap;
va_start(ap, s);
vsnprintf(assl_last_error, sizeof assl_last_error, s, ap);
va_end(ap);
}
void
assl_log(int severity, const char *s, va_list ap)
{
struct assl_error *ce;
const char *prefix;
char *output = NULL;
size_t maxsz = 0, sz;
va_list cap;
/* We need to back this up since we process it twice */
va_copy(cap, ap);
again:
sz = 0;
sz = vsnprintf(output, (output ? (maxsz - sz) : 0), s, ap);
sz += snprintf(output + sz, (output ? (maxsz - sz) : 0), "\n\n");
/* XXX only if going to stderr? */
switch (severity) {
case ASSL_LOG_MSG:
prefix = "ASSL Info\n";
break;
case ASSL_LOG_WARN:
prefix = "ASSL Warning\n";
break;
case ASSL_LOG_ERR:
prefix = "ASSL Fatal Error\n";
break;
default:
prefix = "ASSL Unknown Error\n";
}
sz += snprintf(output + sz, (output ? (maxsz - sz) : 0), "%s", prefix);
SLIST_FOREACH(ce, &aes, link) {
sz += snprintf(output + sz, (output ? (maxsz - sz) : 0),
"\tfile:\t%s\n"
"\tfunct:\t%s\n"
"\tline:\t%d\n"
"\terror:\t%s\n\n",
ce->file,
ce->func,
ce->line,
ce->errstr);
}
if (maxsz == 0) {
sz++; /* for NUL */
maxsz = sz;
if ((output = calloc(maxsz, 1)) == NULL) {
if (assl_log_fn) {
(*assl_log_fn)(ASSL_LOG_WARN, "can't allocate "
"memory for warning buffer");
} else {
fprintf(stderr, "can't allocate memory for "
"warning buffer\n");
}
return;
}
va_copy(ap, cap);
goto again;
}
if (assl_log_fn) {
(*assl_log_fn)(severity, output);
} else {
fprintf(stderr, "%s", output);
}
free(output);
}
__dead void
assl_fatalx(const char *s, ...)
{
va_list ap;
va_start(ap, s);
assl_log(ASSL_LOG_ERR, s, ap);
va_end(ap);
if (assl_child)
_exit(1);
exit(1);
}
void
assl_warnx(const char *s, ...)
{
va_list ap;
va_start(ap, s);
assl_log(ASSL_LOG_WARN, s, ap);
va_end(ap);
}
#endif /* ASSL_NO_FANCY_ERRORS */
void
assl_initialize(void)
{
if (assl_init)
return;
assl_init = 1;
if (assl_initialize_sockets())
assl_fatalx("socket initialization failed");
SSL_library_init();
SSL_load_error_strings();
/* Init hardware crypto engines. */
ENGINE_load_builtin_engines();
ENGINE_register_all_complete();
OpenSSL_add_ssl_algorithms();
assl_err_stack_unwind();
assl_ctx_idx = SSL_get_ex_new_index(0, "assl context", NULL,
NULL, NULL);
}
void
assl_set_cert_flags(struct assl_context *c, int flags)
{
if (flags & ASSL_GF_IGNORE_EXPIRED)
c->as_ignore_expired_cert = 1;
if (flags & ASSL_GF_IGNORE_SELF_SIGNED)
c->as_ignore_self_signed_cert = 1;
}
int
assl_verify_callback(int rv, X509_STORE_CTX *ctx)
{
struct assl_context *c;
SSL *ssl;
ssl = X509_STORE_CTX_get_ex_data(ctx,
SSL_get_ex_data_X509_STORE_CTX_idx());
c = SSL_get_ex_data(ssl, assl_ctx_idx);
/*
fprintf(stderr, "assl_verify_callback: ctx->error %d\n", ctx->error);
*/
rv = 0; /* fail */
/* override expired and self signed certs */
switch (ctx->error) {
case X509_V_OK:
rv = 1;
break;
case X509_V_ERR_CERT_HAS_EXPIRED:
if (c->as_ignore_expired_cert) {
rv = 1;
ctx->error = X509_V_OK;
/*
fprintf(stderr, "ignoring expired\n");
*/
}
break;
case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
if (c->as_ignore_self_signed_cert) {
rv = 1;
ctx->error = X509_V_OK;
/*
fprintf(stderr, "ignoring self signed\n");
*/
}
break;
}
/*
fprintf(stderr, "assl_verify_callback: %s rv %d error %d\n",
rv == 0 ? "failed" : "success", rv, ctx->error);
*/
return (rv);
}
void
assl_setup_verify(struct assl_context *c)
{
/* use callback to ignore some errors such as expired cert */
SSL_CTX_set_verify(c->as_ctx, c->as_verify_mode, assl_verify_callback);
SSL_CTX_set_mode(c->as_ctx, SSL_MODE_AUTO_RETRY);
SSL_CTX_set_verify_depth(c->as_ctx, c->as_verify_depth);
}
DH *
assl_load_dh_params(const char *cert)
{
BIO *bio;
DH *dh = NULL;
if ((bio = BIO_new_file(cert,"r")) == NULL)
ERROR_OUT(ERR_SSL, done);
dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
if (dh == NULL) {
/* try defaults */
if ((dh = DH_new()) == NULL)
ERROR_OUT(ERR_SSL, done);
dh->p = BN_bin2bn(assl_dh512_p, sizeof(assl_dh512_p), NULL);
dh->g = BN_bin2bn(assl_dh512_g, sizeof(assl_dh512_g), NULL);
if ((dh->p == NULL) || (dh->g == NULL)) {
assl_err_own("BN_bin2bn failed in assl_load_dh_params");
ERROR_OUT(ERR_OWN, done);
}
}
done:
if (bio != NULL)
BIO_free(bio);
return (dh);
}
void
assl_free_mem_cert(struct assl_mem_cert* mc)
{
if (mc->assl_mem_ca) {
bzero(mc->assl_mem_ca, mc->assl_mem_ca_len);
free(mc->assl_mem_ca);
mc->assl_mem_ca = NULL;
mc->assl_mem_ca_len = 0;
}
if (mc->assl_mem_cert) {
bzero(mc->assl_mem_cert, mc->assl_mem_cert_len);
free(mc->assl_mem_cert);
mc->assl_mem_cert = NULL;
mc->assl_mem_cert_len = 0;
}
if (mc->assl_mem_key) {
bzero(mc->assl_mem_key, mc->assl_mem_key_len);
free(mc->assl_mem_key);
mc->assl_mem_key = NULL;
mc->assl_mem_key_len = 0;
}
/* DH params */
if (mc->assl_mem_dh) {
DH_free(mc->assl_mem_dh);
mc->assl_mem_dh = NULL;
}
bzero(mc, sizeof *mc);
free(mc);
}
int
assl_destroy_mem_certs(void *token)
{
struct assl_mem_cert *mc = token;
if (mc == NULL)
return (1);
assl_free_mem_cert(mc);
return (0);
}
int
assl_load(const char *filename, void **buf, off_t *len)
{
int f = -1, rv = 1;
struct stat sb;
assl_err_stack_unwind();
if (filename == NULL || buf == NULL || len == NULL) {
assl_err_own("no context, buffer or len");
ERROR_OUT(ERR_OWN, done);
}
if ((f = open(filename, O_RDONLY)) == -1)
ERROR_OUT(ERR_LIBC, done);
if (fstat(f, &sb))
ERROR_OUT(ERR_LIBC, done);
if (*buf) {
free(*buf);
*buf = NULL;
}
*buf = malloc(sb.st_size + 1);
if (*buf == NULL)
ERROR_OUT(ERR_LIBC, done);
if (read(f, *buf, sb.st_size) != sb.st_size)
ERROR_OUT(ERR_LIBC, done);
*len = sb.st_size + 1;
rv = 0;
done:
if (f != -1)
close(f);
return (rv);
}
void *
assl_load_file_certs_to_mem(const char *ca, const char *cert, const char *key)
{
struct assl_mem_cert *mc = NULL;
assl_err_stack_unwind();
mc = calloc(1, sizeof *mc);
if (mc == NULL)
ERROR_OUT(ERR_LIBC, done);
if (ca && assl_load(ca, &mc->assl_mem_ca, &mc->assl_mem_ca_len)) {
assl_err_own("assl_load ca failed");
ERROR_OUT(ERR_OWN, done);
}
if (cert && assl_load(cert, &mc->assl_mem_cert, &mc->assl_mem_cert_len)) {
assl_err_own("assl_load cert failed");
ERROR_OUT(ERR_OWN, done);
}
if (key && assl_load(key, &mc->assl_mem_key, &mc->assl_mem_key_len)) {
assl_err_own("assl_load key failed");
ERROR_OUT(ERR_OWN, done);
}
/* DH params */
if (cert) {
mc->assl_mem_dh = assl_load_dh_params(cert);
if (mc->assl_mem_dh == NULL)
goto done;
}
return (mc);
done:
if (mc)
assl_free_mem_cert(mc);
return (NULL);
}
int
assl_use_mem_certs(struct assl_context *c, void *token)
{
int rv = 1;
struct assl_mem_cert *mc = token;
assl_err_stack_unwind();
if (c == NULL) {
assl_err_own("no context");
ERROR_OUT(ERR_OWN, done);
}
if (mc == NULL) {
assl_err_own("no token");
ERROR_OUT(ERR_OWN, done);
}
if (c->as_server) {
/* server requires all the goodies */
if (mc->assl_mem_ca == NULL || mc->assl_mem_cert == NULL ||
mc->assl_mem_key == NULL) {
if (mc->assl_mem_ca == NULL)
assl_err_own("no ca");
else if (mc->assl_mem_cert == NULL)
assl_err_own("no cert");
else if (mc->assl_mem_key == NULL)
assl_err_own("no key");
ERROR_OUT(ERR_OWN, done);
}
}
c->as_token = token;
/* use certs */
if (!ssl_ctx_load_verify_memory(c->as_ctx, mc->assl_mem_ca,
mc->assl_mem_ca_len))
ERROR_OUT(ERR_SSL, done);
if (!ssl_ctx_use_certificate_chain(c->as_ctx, mc->assl_mem_cert,
mc->assl_mem_cert_len))
ERROR_OUT(ERR_SSL, done);
if (!ssl_ctx_use_private_key(c->as_ctx, mc->assl_mem_key,
mc->assl_mem_key_len))
ERROR_OUT(ERR_SSL, done);
if (!SSL_CTX_check_private_key(c->as_ctx))
ERROR_OUT(ERR_SSL, done);
assl_setup_verify(c);
/* DH params */
if (mc->assl_mem_dh)
c->as_dh = DHparams_dup(mc->assl_mem_dh);
rv = 0;
done:
return (rv);
}
int
assl_load_file_certs(struct assl_context *c, const char *ca, const char *cert,
const char *key)
{
int rv = 1;
struct stat sb;
SSL_CTX *ctx;
assl_err_stack_unwind();
if (c == NULL) {
assl_err_own("no context");
ERROR_OUT(ERR_OWN, done);
}
ctx = c->as_ctx;
if (c->as_server) {
/* server requires all the goodies */
if (ca == NULL || cert == NULL || key == NULL) {
if (ca == NULL)
assl_err_own("no ca");
else if (cert == NULL)
assl_err_own("no cert");
else if (key == NULL)
assl_err_own("no key");
ERROR_OUT(ERR_OWN, done);
}
}
if (ca && lstat(ca, &sb) != 0) {
assl_err_own("unable to load ca \"%s\": %s", ca,
strerror(errno));
ERROR_OUT(ERR_OWN, done);
}
if (cert && lstat(cert, &sb) != 0) {
assl_err_own("unable to load cert \"%s\": %s", cert,
strerror(errno));
ERROR_OUT(ERR_OWN, done);
}
if (key && lstat(key, &sb) != 0) {
assl_err_own("unable to load key \"%s\": %s", key,
strerror(errno));
ERROR_OUT(ERR_OWN, done);
}
if (ca && !SSL_CTX_load_verify_locations(ctx, ca, NULL))
ERROR_OUT(ERR_SSL, done);
if (cert && !SSL_CTX_use_certificate_file(ctx, cert, SSL_FILETYPE_PEM))
ERROR_OUT(ERR_SSL, done);
if (key && !SSL_CTX_use_PrivateKey_file(ctx, key, SSL_FILETYPE_PEM))
ERROR_OUT(ERR_SSL, done);
if (key && !SSL_CTX_check_private_key(ctx))
ERROR_OUT(ERR_SSL, done);
if (c->as_server)
SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(ca));
assl_setup_verify(c);
if (cert) {
c->as_dh = assl_load_dh_params(cert);
if (c->as_dh == NULL)
goto done;
}
rv = 0;
done:
return (rv);
}
#if OPENSSL_VERSION_NUMBER >= 0x10000000L
#define SSL_METHOD_CONST const
#else
#define SSL_METHOD_CONST
#endif
/* older openssl does not support TLS > 1.0 */
#if OPENSSL_VERSION_NUMBER < 0x10001000L
#define TLSv1_1_method TLSv1_method
#define TLSv1_1_client_method TLSv1_client_method
#define TLSv1_1_server_method TLSv1_server_method
#define TLSv1_2_method TLSv1_method
#define TLSv1_2_client_method TLSv1_client_method
#define TLSv1_2_server_method TLSv1_server_method
#define SSL_OP_NO_TLSv1_1 SSL_OP_NO_TLSv1
#define SSL_OP_NO_TLSv1_2 SSL_OP_NO_TLSv1
/* #warning "Installed OpenSSL version does not support TLS > 1.0, falling back to 1.0" */
#endif
struct assl_context *
assl_internal_alloc_context(SSL_METHOD_CONST SSL_METHOD *meth, int flags, int server)
{
struct assl_context *c = NULL;
c = calloc(1, sizeof *c);
if (c == NULL)
ERROR_OUT(ERR_LIBC, unwind);
/* set some sane values */
c->as_sock = -1;
c->as_method = meth;
c->as_server = server;
c->as_ctx = SSL_CTX_new(meth);
if (c->as_ctx == NULL)
ERROR_OUT(ERR_SSL, unwind);
/* allow all buggy implementations to play */
SSL_CTX_set_options(c->as_ctx, SSL_OP_ALL);
if (c->as_server)
SSL_CTX_set_options(c->as_ctx,
SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION);
/*
* Assume we want to verify client and server certificates
* client ignores SSL_VERIFY_FAIL_IF_NO_PEER_CERT so just set it
*
* This needs to be set for anonymous connections
*/
if (flags & ASSL_F_DONT_VERIFY)
c->as_verify_mode = SSL_VERIFY_NONE;
else
c->as_verify_mode = SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
SSL_VERIFY_PEER;
/* do not encrypt transport */
if (flags & ASSL_F_DONT_ENCRYPT)
if (!SSL_CTX_set_cipher_list(c->as_ctx, "eNULL"))
ERROR_OUT(ERR_SSL, unwind);
c->as_verify_depth = ASSL_VERIFY_DEPTH;
/* set defaults */
c->as_curve = NID_secp521r1;
return (c);
unwind:
if (c)
free(c);
return (NULL);
}
struct assl_context *
assl_alloc_context(enum assl_method m, int flags)
{
int server = 0;
SSL_METHOD_CONST SSL_METHOD *meth;
assl_err_stack_unwind();
assl_initialize_sockets();
if (flags & ASSL_F_CHILD)
assl_child = getpid();
switch (m) {
/* ALL versions */
case ASSL_M_ALL:
meth = SSLv23_method();
server = 1;
break;
case ASSL_M_ALL_CLIENT:
meth = SSLv23_client_method();
break;
case ASSL_M_ALL_SERVER:
meth = SSLv23_server_method();
server = 1;
break;
/* TLS 1.0 */
case ASSL_M_TLSV1:
meth = TLSv1_method();
server = 1;
break;
case ASSL_M_TLSV1_CLIENT:
meth = TLSv1_client_method();
break;
case ASSL_M_TLSV1_SERVER:
meth = TLSv1_server_method();
server = 1;
break;
/* TLS 1.1 */
case ASSL_M_TLSV1_1:
meth = TLSv1_1_method();
server = 1;
break;
case ASSL_M_TLSV1_1_CLIENT:
meth = TLSv1_1_client_method();
break;
case ASSL_M_TLSV1_1_SERVER:
meth = TLSv1_1_server_method();
server = 1;
break;
/* TLS 1.2 */
case ASSL_M_TLSV1_2:
meth = TLSv1_2_method();
server = 1;
break;
case ASSL_M_TLSV1_2_CLIENT:
meth = TLSv1_2_client_method();
break;
case ASSL_M_TLSV1_2_SERVER:
meth = TLSv1_2_server_method();
server = 1;
break;
default:
assl_err_own("invalid method %d", m);
ERROR_OUT(ERR_OWN, unwind);
}
return (assl_internal_alloc_context(meth, flags, server));
unwind:
return (NULL);
}
struct assl_context *
assl_alloc_context_v2(int flags, char *argv[])
{
struct assl_context *c = NULL;
SSL_METHOD_CONST SSL_METHOD *meth;
char *named_curve = NULL;
int i;
meth = SSLv23_method();
if ((c = assl_internal_alloc_context(meth, flags, 1)) == NULL)
goto unwind;
SSL_CTX_set_options(c->as_ctx, SSL_OP_NO_SSLv2); /* disallow SSL v2 */
SSL_CTX_set_options(c->as_ctx, SSL_OP_NO_SSLv3); /* disallow SSL v3 */
if (!(flags & ASSL_F_TLS1))
SSL_CTX_set_options(c->as_ctx, SSL_OP_NO_TLSv1);
if (!(flags & ASSL_F_TLS1_1))
SSL_CTX_set_options(c->as_ctx, SSL_OP_NO_TLSv1_1);
if (!(flags & ASSL_F_TLS1_2))
SSL_CTX_set_options(c->as_ctx, SSL_OP_NO_TLSv1_2);
if (argv == NULL)
goto done;
for (i = 0; argv[i] != NULL; i++) {
if (!strncmp(argv[i], ASSL_ARG_NAMEDCURVE,
strlen(ASSL_ARG_NAMEDCURVE))) {
named_curve = argv[i] + strlen(ASSL_ARG_NAMEDCURVE);
c->as_curve = OBJ_sn2nid(named_curve);
if (c->as_curve == 0) {
assl_err_own("invalid curve %s", named_curve);
ERROR_OUT(ERR_OWN, unwind);
}
} else {
assl_err_own("invalid argument %s", argv[i]);
ERROR_OUT(ERR_OWN, unwind);
}
}
done:
return (c);
unwind:
if (c)
free(c);
return (NULL);
}
int
assl_poll(struct assl_context *c, int mseconds, short event, short *revents)
{
struct pollfd fds[1];
int nfds, rv = -1;
assl_err_stack_unwind();
if (c == NULL) {
assl_err_own("no context");
ERROR_OUT(ERR_OWN, done);
}
errno = 0;
fds[0].fd = c->as_sock;
fds[0].events = event;
nfds = poll(fds, 1, mseconds);
if (nfds == 0) {
rv = 0;
assl_err_own("poll timeout");
ERROR_OUT(ERR_OWN, done);
} else if (nfds == -1 || (fds[0].revents & (POLLERR|POLLHUP|POLLNVAL)))
ERROR_OUT(ERR_LIBC, done);
rv = 1;
if (revents)
*revents = fds[0].revents;
done:
return (rv);
}
int
assl_negotiate_nonblock(struct assl_context *c)
{
int r, rv = 1, p, timo;
struct timeval tval, told;
struct timeval now, end, trem;
struct sockaddr_storage ss;
socklen_t len;
char peer[NI_MAXHOST];
assl_err_stack_unwind();
if (c == NULL) {
assl_err_own("no context");
ERROR_OUT(ERR_OWN, bad);
}
len = sizeof(ss);
if (getpeername(c->as_sock, (struct sockaddr *)&ss, &len) != -1 &&
getnameinfo((struct sockaddr *)&ss, len,
peer, NI_MAXHOST, NULL, 0, NI_NUMERICHOST) == 0)
c->as_peername = strdup(peer);
if (assl_get_recvtimeo(c->as_sock, &told))
ERROR_OUT(ERR_SOCKET, bad);
tval.tv_sec = 1;
tval.tv_usec = 0;
if (assl_set_recvtimeo(c->as_sock, &tval))
ERROR_OUT(ERR_SOCKET, done);
if (gettimeofday(&now, NULL) == -1) {
assl_err_own("can't obtain time");
ERROR_OUT(ERR_OWN, done);
}
trem.tv_sec = 10;
trem.tv_usec = 0;
timeradd(&now, &trem, &end);
for (;;) {
if (c->as_server)
r = SSL_accept(c->as_ssl);
else
r = SSL_connect(c->as_ssl);
if (gettimeofday(&now, NULL) == -1) {
assl_err_own("can't obtain time");
ERROR_OUT(ERR_OWN, done);
}
if (timercmp(&now, &end, >=)) {
assl_err_own("SSL negotiation timeout");
ERROR_OUT(ERR_OWN, done);
}
switch (assl_get_ssl_error(c->as_ssl, r)) {
case SSL_ERROR_NONE:
rv = 0;
goto done;
case SSL_ERROR_WANT_READ:
timersub(&end, &now, &trem);
timo = (trem.tv_sec * 1000) + (trem.tv_usec / 1000);
p = assl_poll(c, timo, POLLIN, NULL);
if (p == -1) {
if (errno == EINTR)
continue;
ERROR_OUT(ERR_SOCKET, done);
}
break;
case SSL_ERROR_SYSCALL:
rv = -1;
ERROR_OUT(ERR_SOCKET, done);
break;
case SSL_ERROR_ZERO_RETURN:
/* connection hung up on the other side */
rv = -1;
assl_err_own("connection closed by peer");
ERROR_OUT(ERR_OWN, done);
break;
default:
rv = -1;
/* XXX we want this additional information */
/*
ERR_print_errors_fp(stderr);
*/
ERROR_OUT(ERR_SSL, done);
}
}
done:
assl_set_recvtimeo(c->as_sock, &told);
bad:
return (rv);
}