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xbps/lib/fetch/common.c

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/* $FreeBSD: rev 288217 $ */
/* $NetBSD: common.c,v 1.29 2014/01/08 20:25:34 joerg Exp $ */
/*-
* Copyright (c) 1998-2014 Dag-Erling Smorgrav
* Copyright (c) 2008, 2010 Joerg Sonnenberger <joerg@NetBSD.org>
* Copyright (c) 2013 Michael Gmelin <freebsd@grem.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "compat.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#if defined(HAVE_INTTYPES_H) || defined(NETBSD)
#include <inttypes.h>
#endif
#include <netdb.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <strings.h>
#ifndef MSG_NOSIGNAL
#include <signal.h>
#endif
#ifdef WITH_SSL
#include <openssl/x509v3.h>
#endif
#include <pthread.h>
#include "fetch.h"
#include "common.h"
#ifdef __clang__
#pragma clang diagnostic ignored "-Wformat-nonliteral"
#endif
/*** Local data **************************************************************/
/*
* Error messages for resolver errors
*/
static struct fetcherr netdb_errlist[] = {
#ifdef EAI_NODATA
{ EAI_NODATA, FETCH_RESOLV, "Host not found" },
#endif
{ EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" },
{ EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" },
{ EAI_NONAME, FETCH_RESOLV, "No address record" },
{ -1, FETCH_UNKNOWN, "Unknown resolver error" }
};
/*** Error-reporting functions ***********************************************/
/*
* Map error code to string
*/
static struct fetcherr *
fetch_finderr(struct fetcherr *p, int e)
{
while (p->num != -1 && p->num != e)
p++;
return (p);
}
/*
* Set error code
*/
void
fetch_seterr(struct fetcherr *p, int e)
{
p = fetch_finderr(p, e);
fetchLastErrCode = p->cat;
snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string);
}
/*
* Set error code according to errno
*/
void
fetch_syserr(void)
{
switch (errno) {
case 0:
fetchLastErrCode = FETCH_OK;
break;
case EPERM:
case EACCES:
case EROFS:
#ifdef EAUTH
case EAUTH:
#endif
#ifdef ENEEDAUTH
case ENEEDAUTH:
#endif
fetchLastErrCode = FETCH_AUTH;
break;
case ENOENT:
case EISDIR: /* XXX */
fetchLastErrCode = FETCH_UNAVAIL;
break;
case ENOMEM:
fetchLastErrCode = FETCH_MEMORY;
break;
case EBUSY:
case EAGAIN:
fetchLastErrCode = FETCH_TEMP;
break;
case EEXIST:
fetchLastErrCode = FETCH_EXISTS;
break;
case ENOSPC:
fetchLastErrCode = FETCH_FULL;
break;
case EADDRINUSE:
case EADDRNOTAVAIL:
case ENETDOWN:
case ENETUNREACH:
case ENETRESET:
case EHOSTUNREACH:
fetchLastErrCode = FETCH_NETWORK;
break;
case ECONNABORTED:
case ECONNRESET:
fetchLastErrCode = FETCH_ABORT;
break;
case ETIMEDOUT:
fetchLastErrCode = FETCH_TIMEOUT;
break;
case ECONNREFUSED:
case EHOSTDOWN:
fetchLastErrCode = FETCH_DOWN;
break;
default:
fetchLastErrCode = FETCH_UNKNOWN;
}
snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno));
}
/*
* Emit status message
*/
void
fetch_info(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fputc('\n', stderr);
}
/*** Network-related utility functions ***************************************/
/*
* Return the default port for a scheme
*/
int
fetch_default_port(const char *scheme)
{
struct servent *se;
if (strcasecmp(scheme, SCHEME_FTP) == 0)
return (FTP_DEFAULT_PORT);
if (strcasecmp(scheme, SCHEME_HTTP) == 0)
return (HTTP_DEFAULT_PORT);
if (strcasecmp(scheme, SCHEME_HTTPS) == 0)
return (HTTPS_DEFAULT_PORT);
if ((se = getservbyname(scheme, "tcp")) != NULL)
return (ntohs(se->s_port));
return (0);
}
/*
* Return the default proxy port for a scheme
*/
int
fetch_default_proxy_port(const char *scheme)
{
if (strcasecmp(scheme, SCHEME_FTP) == 0)
return (FTP_DEFAULT_PROXY_PORT);
if (strcasecmp(scheme, SCHEME_HTTP) == 0)
return (HTTP_DEFAULT_PROXY_PORT);
return (0);
}
/*
* Create a connection for an existing descriptor.
*/
conn_t *
fetch_reopen(int sd)
{
conn_t *conn;
/* allocate and fill connection structure */
if ((conn = calloc(1, sizeof(*conn))) == NULL)
return (NULL);
conn->ftp_home = NULL;
conn->cache_url = NULL;
conn->next_buf = NULL;
conn->next_len = 0;
conn->sd = sd;
return (conn);
}
/*
* Bind a socket to a specific local address
*/
int
fetch_bind(int sd, int af, const char *addr)
{
struct addrinfo hints, *res, *res0;
int rv = -1;
memset(&hints, 0, sizeof(hints));
hints.ai_family = af;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
if (getaddrinfo(addr, NULL, &hints, &res0))
return (-1);
for (res = res0; res; res = res->ai_next) {
if (bind(sd, res->ai_addr, res->ai_addrlen) == 0) {
rv = 0;
break;
}
}
freeaddrinfo(res0);
return rv;
}
/*
* Establish a TCP connection to the specified port on the specified host.
*/
conn_t *
fetch_connect(struct url *url, int af, int verbose)
{
conn_t *conn;
char pbuf[10];
const char *bindaddr;
struct addrinfo hints, *res, *res0;
int sd, error;
if (verbose)
fetch_info("looking up %s", url->host);
/* look up host name and set up socket address structure */
snprintf(pbuf, sizeof(pbuf), "%d", url->port);
memset(&hints, 0, sizeof(hints));
hints.ai_family = af;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
if ((error = getaddrinfo(url->host, pbuf, &hints, &res0)) != 0) {
netdb_seterr(error);
return (NULL);
}
bindaddr = getenv("FETCH_BIND_ADDRESS");
if (verbose)
fetch_info("connecting to %s:%d", url->host, url->port);
/* try to connect */
for (sd = -1, res = res0; res; sd = -1, res = res->ai_next) {
if ((sd = socket(res->ai_family, res->ai_socktype,
res->ai_protocol)) == -1)
continue;
if (bindaddr != NULL && *bindaddr != '\0' &&
fetch_bind(sd, res->ai_family, bindaddr) != 0) {
fetch_info("failed to bind to '%s'", bindaddr);
close(sd);
continue;
}
if (connect(sd, res->ai_addr, res->ai_addrlen) == 0)
break;
close(sd);
}
freeaddrinfo(res0);
if (sd == -1) {
fetch_syserr();
return (NULL);
}
if ((conn = fetch_reopen(sd)) == NULL) {
fetch_syserr();
close(sd);
return NULL;
}
conn->cache_url = fetchCopyURL(url);
conn->cache_af = af;
return (conn);
}
static pthread_mutex_t cache_mtx = PTHREAD_MUTEX_INITIALIZER;
static conn_t *connection_cache;
static int cache_global_limit = 0;
static int cache_per_host_limit = 0;
/*
* Initialise cache with the given limits.
*/
void
fetchConnectionCacheInit(int global_limit, int per_host_limit)
{
if (global_limit < 0)
cache_global_limit = INT_MAX;
else if (per_host_limit > global_limit)
cache_global_limit = per_host_limit;
else
cache_global_limit = global_limit;
if (per_host_limit < 0)
cache_per_host_limit = INT_MAX;
else
cache_per_host_limit = per_host_limit;
}
/*
* Flush cache and free all associated resources.
*/
void
fetchConnectionCacheClose(void)
{
conn_t *conn;
while ((conn = connection_cache) != NULL) {
connection_cache = conn->next_cached;
(*conn->cache_close)(conn);
}
}
/*
* Check connection cache for an existing entry matching
* protocol/host/port/user/password/family.
*/
conn_t *
fetch_cache_get(const struct url *url, int af)
{
conn_t *conn, *last_conn = NULL;
pthread_mutex_lock(&cache_mtx);
for (conn = connection_cache; conn; conn = conn->next_cached) {
if (conn->cache_url->port == url->port &&
strcmp(conn->cache_url->scheme, url->scheme) == 0 &&
strcmp(conn->cache_url->host, url->host) == 0 &&
strcmp(conn->cache_url->user, url->user) == 0 &&
strcmp(conn->cache_url->pwd, url->pwd) == 0 &&
(conn->cache_af == AF_UNSPEC || af == AF_UNSPEC ||
conn->cache_af == af)) {
if (last_conn != NULL)
last_conn->next_cached = conn->next_cached;
else
connection_cache = conn->next_cached;
pthread_mutex_unlock(&cache_mtx);
return conn;
}
}
pthread_mutex_unlock(&cache_mtx);
return NULL;
}
/*
* Put the connection back into the cache for reuse.
* If the connection is freed due to LRU or if the cache
* is explicitly closed, the given callback is called.
*/
void
fetch_cache_put(conn_t *conn, int (*closecb)(conn_t *))
{
conn_t *iter, *last;
int global_count, host_count;
if (conn->cache_url == NULL || cache_global_limit == 0) {
(*closecb)(conn);
return;
}
pthread_mutex_lock(&cache_mtx);
global_count = host_count = 0;
last = NULL;
for (iter = connection_cache; iter;
last = iter, iter = iter->next_cached) {
++global_count;
if (strcmp(conn->cache_url->host, iter->cache_url->host) == 0)
++host_count;
if (global_count < cache_global_limit &&
host_count < cache_per_host_limit)
continue;
--global_count;
if (last != NULL)
last->next_cached = iter->next_cached;
else
connection_cache = iter->next_cached;
(*iter->cache_close)(iter);
}
conn->cache_close = closecb;
conn->next_cached = connection_cache;
connection_cache = conn;
pthread_mutex_unlock(&cache_mtx);
}
#ifdef WITH_SSL
/*
* Find the first occurrence of find in s, where the search is limited to the
* first slen characters of s.
*/
static char *
strnstr(const char *s, const char *find, size_t slen)
{
char c, sc;
size_t len;
if ((c = *find++) != '\0') {
len = strlen(find);
do {
do {
if (slen-- < 1 || (sc = *s++) == '\0')
return (NULL);
} while (sc != c);
if (len > slen)
return (NULL);
} while (strncmp(s, find, len) != 0);
s--;
}
return ((char *)__UNCONST(s));
}
/*
* Convert characters A-Z to lowercase (intentionally avoid any locale
* specific conversions).
*/
static char
fetch_ssl_tolower(char in)
{
if (in >= 'A' && in <= 'Z')
return (in + 32);
else
return (in);
}
/*
* isalpha implementation that intentionally avoids any locale specific
* conversions.
*/
static int
fetch_ssl_isalpha(char in)
{
return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z'));
}
/*
* Check if passed hostnames a and b are equal.
*/
static int
fetch_ssl_hname_equal(const char *a, size_t alen, const char *b,
size_t blen)
{
size_t i;
if (alen != blen)
return (0);
for (i = 0; i < alen; ++i) {
if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i]))
return (0);
}
return (1);
}
/*
* Check if domain label is traditional, meaning that only A-Z, a-z, 0-9
* and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha-
* numeric characters. Double hyphens (like they're found in IDN a-labels
* 'xn--') are not allowed. Empty labels are invalid.
*/
static int
fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok)
{
size_t i;
if (!len || l[0] == '-' || l[len-1] == '-')
return (0);
for (i = 0; i < len; ++i) {
if (!isdigit(l[i]) &&
!fetch_ssl_isalpha(l[i]) &&
!(l[i] == '*' && wcok) &&
!(l[i] == '-' && l[i - 1] != '-'))
return (0);
}
return (1);
}
/*
* Check if host name consists only of numbers. This might indicate an IP
* address, which is not a good idea for CN wildcard comparison.
*/
static int
fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len)
{
size_t i;
for (i = 0; i < len; ++i) {
if (!((hostname[i] >= '0' && hostname[i] <= '9') ||
hostname[i] == '.'))
return (0);
}
return (1);
}
/*
* Check if the host name h passed matches the pattern passed in m which
* is usually part of subjectAltName or CN of a certificate presented to
* the client. This includes wildcard matching. The algorithm is based on
* RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280.
*/
static int
fetch_ssl_hname_match(const char *h, size_t hlen, const char *m,
size_t mlen)
{
int delta, hdotidx, mdot1idx, wcidx;
const char *hdot, *mdot1, *mdot2;
const char *wc; /* wildcard */
if (!(h && *h && m && *m))
return (0);
if ((wc = strnstr(m, "*", mlen)) == NULL)
return (fetch_ssl_hname_equal(h, hlen, m, mlen));
wcidx = wc - m;
/* hostname should not be just dots and numbers */
if (fetch_ssl_hname_is_only_numbers(h, hlen))
return (0);
/* only one wildcard allowed in pattern */
if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL)
return (0);
/*
* there must be at least two more domain labels and
* wildcard has to be in the leftmost label (RFC6125)
*/
mdot1 = strnstr(m, ".", mlen);
if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4)
return (0);
mdot1idx = mdot1 - m;
mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1);
if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2)
return (0);
/* hostname must contain a dot and not be the 1st char */
hdot = strnstr(h, ".", hlen);
if (hdot == NULL || hdot == h)
return (0);
hdotidx = hdot - h;
/*
* host part of hostname must be at least as long as
* pattern it's supposed to match
*/
if (hdotidx < mdot1idx)
return (0);
/*
* don't allow wildcards in non-traditional domain names
* (IDN, A-label, U-label...)
*/
if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) ||
!fetch_ssl_is_trad_domain_label(m, mdot1idx, 1))
return (0);
/* match domain part (part after first dot) */
if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1,
mlen - mdot1idx))
return (0);
/* match part left of wildcard */
if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx))
return (0);
/* match part right of wildcard */
delta = mdot1idx - wcidx - 1;
if (!fetch_ssl_hname_equal(hdot - delta, delta,
mdot1 - delta, delta))
return (0);
/* all tests succeded, it's a match */
return (1);
}
/*
* Get numeric host address info - returns NULL if host was not an IP
* address. The caller is responsible for deallocation using
* freeaddrinfo(3).
*/
static struct addrinfo *
fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len)
{
struct addrinfo hints, *res;
char *host;
host = (char *)malloc(len + 1);
memcpy(host, hostname, len);
host[len] = '\0';
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
hints.ai_flags = AI_NUMERICHOST;
/* port is not relevant for this purpose */
if (getaddrinfo(host, "443", &hints, &res) != 0) {
free(host);
return NULL;
}
free(host);
return res;
}
/*
* Compare ip address in addrinfo with address passes.
*/
static int
fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost,
size_t rhostlen)
{
const void *left;
if (lhost->ai_family == AF_INET && rhostlen == 4) {
left = (void *)&((struct sockaddr_in*)(void *)
lhost->ai_addr)->sin_addr.s_addr;
#ifdef INET6
} else if (lhost->ai_family == AF_INET6 && rhostlen == 16) {
left = (void *)&((struct sockaddr_in6 *)(void *)
lhost->ai_addr)->sin6_addr;
#endif
} else
return (0);
return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0);
}
/*
* Compare ip address in addrinfo with host passed. If host is not an IP
* address, comparison will fail.
*/
static int
fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r,
size_t rlen)
{
struct addrinfo *raddr;
int ret;
char *rip;
ret = 0;
if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL)
return 0; /* not a numeric host */
if (laddr->ai_family == raddr->ai_family) {
if (laddr->ai_family == AF_INET) {
rip = (char *)&((struct sockaddr_in *)(void *)
raddr->ai_addr)->sin_addr.s_addr;
ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4);
#ifdef INET6
} else if (laddr->ai_family == AF_INET6) {
rip = (char *)&((struct sockaddr_in6 *)(void *)
raddr->ai_addr)->sin6_addr;
ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16);
#endif
}
}
freeaddrinfo(raddr);
return (ret);
}
/*
* Verify server certificate by subjectAltName.
*/
static int
fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames,
const char *host, struct addrinfo *ip)
{
const GENERAL_NAME *name;
size_t nslen;
int i;
const char *ns;
for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) {
name = sk_GENERAL_NAME_value(altnames, i);
ns = (const char *)ASN1_STRING_data(name->d.ia5);
nslen = (size_t)ASN1_STRING_length(name->d.ia5);
if (name->type == GEN_DNS && ip == NULL &&
fetch_ssl_hname_match(host, strlen(host), ns, nslen))
return (1);
else if (name->type == GEN_IPADD && ip != NULL &&
fetch_ssl_ipaddr_match_bin(ip, ns, nslen))
return (1);
}
return (0);
}
/*
* Verify server certificate by CN.
*/
static int
fetch_ssl_verify_cn(X509_NAME *subject, const char *host,
struct addrinfo *ip)
{
ASN1_STRING *namedata;
X509_NAME_ENTRY *nameentry;
int cnlen, lastpos, loc, ret;
unsigned char *cn;
ret = 0;
lastpos = -1;
loc = -1;
cn = NULL;
/* get most specific CN (last entry in list) and compare */
while ((lastpos = X509_NAME_get_index_by_NID(subject,
NID_commonName, lastpos)) != -1)
loc = lastpos;
if (loc > -1) {
nameentry = X509_NAME_get_entry(subject, loc);
namedata = X509_NAME_ENTRY_get_data(nameentry);
cnlen = ASN1_STRING_to_UTF8(&cn, namedata);
if (ip == NULL &&
fetch_ssl_hname_match(host, strlen(host), (const char *)cn, cnlen))
ret = 1;
else if (ip != NULL && fetch_ssl_ipaddr_match(ip, (const char *)cn, cnlen))
ret = 1;
OPENSSL_free(cn);
}
return (ret);
}
/*
* Verify that server certificate subjectAltName/CN matches
* hostname. First check, if there are alternative subject names. If yes,
* those have to match. Only if those don't exist it falls back to
* checking the subject's CN.
*/
static int
fetch_ssl_verify_hname(X509 *cert, const char *host)
{
struct addrinfo *ip;
STACK_OF(GENERAL_NAME) *altnames;
X509_NAME *subject;
int ret;
ret = 0;
ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host));
altnames = X509_get_ext_d2i(cert, NID_subject_alt_name,
NULL, NULL);
if (altnames != NULL) {
ret = fetch_ssl_verify_altname(altnames, host, ip);
} else {
subject = X509_get_subject_name(cert);
if (subject != NULL)
ret = fetch_ssl_verify_cn(subject, host, ip);
}
if (ip != NULL)
freeaddrinfo(ip);
if (altnames != NULL)
GENERAL_NAMES_free(altnames);
return (ret);
}
/*
* Configure transport security layer based on environment.
*/
static void
fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose)
{
long ssl_ctx_options;
ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_TICKET;
if (getenv("SSL_ALLOW_SSL3") == NULL)
ssl_ctx_options |= SSL_OP_NO_SSLv3;
if (getenv("SSL_NO_TLS1") != NULL)
ssl_ctx_options |= SSL_OP_NO_TLSv1;
if (getenv("SSL_NO_TLS1_1") != NULL)
ssl_ctx_options |= SSL_OP_NO_TLSv1_1;
if (getenv("SSL_NO_TLS1_2") != NULL)
ssl_ctx_options |= SSL_OP_NO_TLSv1_2;
if (verbose)
fetch_info("SSL options: %lx", ssl_ctx_options);
SSL_CTX_set_options(ctx, ssl_ctx_options);
}
/*
* Configure peer verification based on environment.
*/
static int
fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose)
{
X509_LOOKUP *crl_lookup;
X509_STORE *crl_store;
const char *ca_cert_file, *ca_cert_path, *crl_file;
if (getenv("SSL_NO_VERIFY_PEER") == NULL) {
ca_cert_file = getenv("SSL_CA_CERT_FILE");
ca_cert_path = getenv("SSL_CA_CERT_PATH") != NULL ?
getenv("SSL_CA_CERT_PATH") : X509_get_default_cert_dir();
if (verbose) {
fetch_info("Peer verification enabled");
if (ca_cert_file != NULL)
fetch_info("Using CA cert file: %s",
ca_cert_file);
if (ca_cert_path != NULL)
fetch_info("Using CA cert path: %s",
ca_cert_path);
}
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER,
fetch_ssl_cb_verify_crt);
SSL_CTX_load_verify_locations(ctx, ca_cert_file,
ca_cert_path);
if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) {
if (verbose)
fetch_info("Using CRL file: %s", crl_file);
crl_store = SSL_CTX_get_cert_store(ctx);
crl_lookup = X509_STORE_add_lookup(crl_store,
X509_LOOKUP_file());
if (crl_lookup == NULL ||
!X509_load_crl_file(crl_lookup, crl_file,
X509_FILETYPE_PEM)) {
fprintf(stderr,
"Could not load CRL file %s\n",
crl_file);
return (0);
}
X509_STORE_set_flags(crl_store,
X509_V_FLAG_CRL_CHECK |
X509_V_FLAG_CRL_CHECK_ALL);
}
}
return (1);
}
/*
* Configure client certificate based on environment.
*/
static int
fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose)
{
const char *client_cert_file, *client_key_file;
if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) {
client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ?
getenv("SSL_CLIENT_KEY_FILE") : client_cert_file;
if (verbose) {
fetch_info("Using client cert file: %s",
client_cert_file);
fetch_info("Using client key file: %s",
client_key_file);
}
if (SSL_CTX_use_certificate_chain_file(ctx,
client_cert_file) != 1) {
fprintf(stderr,
"Could not load client certificate %s\n",
client_cert_file);
return (0);
}
if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file,
SSL_FILETYPE_PEM) != 1) {
fprintf(stderr,
"Could not load client key %s\n",
client_key_file);
return (0);
}
}
return (1);
}
/*
* Callback for SSL certificate verification, this is called on server
* cert verification. It takes no decision, but informs the user in case
* verification failed.
*/
int
fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx)
{
X509 *crt;
X509_NAME *name;
char *str;
str = NULL;
if (!verified) {
if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL &&
(name = X509_get_subject_name(crt)) != NULL)
str = X509_NAME_oneline(name, 0, 0);
fprintf(stderr, "Certificate verification failed for %s\n",
str != NULL ? str : "no relevant certificate");
OPENSSL_free(str);
}
return (verified);
}
#endif
/*
* Enable SSL on a connection.
*/
int
fetch_ssl(conn_t *conn, const struct url *URL, int verbose)
{
#ifdef WITH_SSL
int ret;
X509_NAME *name;
char *str;
/* Init the SSL library and context */
if (!SSL_library_init()){
fprintf(stderr, "SSL library init failed\n");
return (-1);
}
SSL_load_error_strings();
conn->ssl_meth = SSLv23_client_method();
conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth);
SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY);
fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose);
if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose))
return (-1);
if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose))
return (-1);
conn->ssl = SSL_new(conn->ssl_ctx);
if (conn->ssl == NULL) {
fprintf(stderr, "SSL context creation failed\n");
return (-1);
}
SSL_set_connect_state(conn->ssl);
if (!SSL_set_fd(conn->ssl, conn->sd)) {
fprintf(stderr, "SSL_set_fd failed\n");
return (-1);
}
#if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT)
if (!SSL_set_tlsext_host_name(conn->ssl, (char *)(uintptr_t)URL->host)) {
fprintf(stderr,
"TLS server name indication extension failed for host %s\n",
URL->host);
return (-1);
}
#endif
if ((ret = SSL_connect(conn->ssl)) <= 0){
fprintf(stderr, "SSL_connect returned %d\n", SSL_get_error(conn->ssl, ret));
return (-1);
}
conn->ssl_cert = SSL_get_peer_certificate(conn->ssl);
if (conn->ssl_cert == NULL) {
fprintf(stderr, "No server SSL certificate\n");
return (-1);
}
if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) {
if (verbose)
fetch_info("Verify hostname");
if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) {
fprintf(stderr,
"SSL certificate subject doesn't match host %s\n",
URL->host);
return (-1);
}
}
if (verbose) {
fetch_info("%s connection established using %s",
SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl));
conn->ssl_cert = SSL_get_peer_certificate(conn->ssl);
name = X509_get_subject_name(conn->ssl_cert);
str = X509_NAME_oneline(name, 0, 0);
fetch_info("Certificate subject: %s", str);
OPENSSL_free(str);
name = X509_get_issuer_name(conn->ssl_cert);
str = X509_NAME_oneline(name, 0, 0);
fetch_info("Certificate issuer: %s", str);
OPENSSL_free(str);
}
return (0);
#else
(void)conn;
(void)verbose;
fprintf(stderr, "SSL support disabled\n");
return (-1);
#endif
}
/*
* Read a character from a connection w/ timeout
*/
ssize_t
fetch_read(conn_t *conn, char *buf, size_t len)
{
struct timeval now, timeout, waittv;
fd_set readfds;
ssize_t rlen;
int r;
if (!buf)
return -1;
if (len == 0)
return 0;
if (conn->next_len != 0) {
if (conn->next_len < len)
len = conn->next_len;
memmove(buf, conn->next_buf, len);
conn->next_len -= len;
conn->next_buf += len;
return len;
}
if (fetchTimeout) {
FD_ZERO(&readfds);
gettimeofday(&timeout, NULL);
timeout.tv_sec += fetchTimeout;
}
for (;;) {
while (fetchTimeout && !FD_ISSET(conn->sd, &readfds)) {
FD_SET(conn->sd, &readfds);
gettimeofday(&now, NULL);
waittv.tv_sec = timeout.tv_sec - now.tv_sec;
waittv.tv_usec = timeout.tv_usec - now.tv_usec;
if (waittv.tv_usec < 0) {
waittv.tv_usec += 1000000;
waittv.tv_sec--;
}
if (waittv.tv_sec < 0) {
errno = ETIMEDOUT;
fetch_syserr();
return (-1);
}
errno = 0;
#ifdef WITH_SSL
if (conn->ssl && SSL_pending(conn->ssl))
break;
#endif
r = select(conn->sd + 1, &readfds, NULL, NULL, &waittv);
if (r == -1) {
if (errno == EINTR && fetchRestartCalls)
continue;
fetch_syserr();
return (-1);
}
}
#ifdef WITH_SSL
if (conn->ssl != NULL)
rlen = SSL_read(conn->ssl, buf, len);
else
#endif
rlen = read(conn->sd, buf, len);
if (rlen >= 0)
break;
if (errno != EINTR || !fetchRestartCalls)
return (-1);
}
return (rlen);
}
/*
* Read a line of text from a connection w/ timeout
*/
#define MIN_BUF_SIZE 1024
int
fetch_getln(conn_t *conn)
{
char *tmp, *next;
size_t tmpsize;
ssize_t len;
if (conn->buf == NULL) {
if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) {
errno = ENOMEM;
return (-1);
}
conn->bufsize = MIN_BUF_SIZE;
}
conn->buflen = 0;
next = NULL;
do {
/*
* conn->bufsize != conn->buflen at this point,
* so the buffer can be NUL-terminated below for
* the case of len == 0.
*/
len = fetch_read(conn, conn->buf + conn->buflen,
conn->bufsize - conn->buflen);
if (len == -1)
return (-1);
if (len == 0)
break;
next = memchr(conn->buf + conn->buflen, '\n', len);
conn->buflen += len;
if (conn->buflen == conn->bufsize && next == NULL) {
tmp = conn->buf;
tmpsize = conn->bufsize * 2;
if (tmpsize < conn->bufsize) {
errno = ENOMEM;
return (-1);
}
if ((tmp = realloc(tmp, tmpsize)) == NULL) {
errno = ENOMEM;
return (-1);
}
conn->buf = tmp;
conn->bufsize = tmpsize;
}
} while (next == NULL);
if (next != NULL) {
*next = '\0';
conn->next_buf = next + 1;
conn->next_len = conn->buflen - (conn->next_buf - conn->buf);
conn->buflen = next - conn->buf;
} else {
conn->buf[conn->buflen] = '\0';
conn->next_len = 0;
}
return (0);
}
/*
* Write a vector to a connection w/ timeout
* Note: can modify the iovec.
*/
ssize_t
fetch_write(conn_t *conn, const void *buf, size_t len)
{
struct timeval now, timeout, waittv;
fd_set writefds;
ssize_t wlen, total;
int r;
#ifndef MSG_NOSIGNAL
static int killed_sigpipe;
#endif
#ifndef MSG_NOSIGNAL
if (!killed_sigpipe) {
signal(SIGPIPE, SIG_IGN);
killed_sigpipe = 1;
}
#endif
if (fetchTimeout) {
FD_ZERO(&writefds);
gettimeofday(&timeout, NULL);
timeout.tv_sec += fetchTimeout;
}
total = 0;
while (len) {
while (fetchTimeout && !FD_ISSET(conn->sd, &writefds)) {
FD_SET(conn->sd, &writefds);
gettimeofday(&now, NULL);
waittv.tv_sec = timeout.tv_sec - now.tv_sec;
waittv.tv_usec = timeout.tv_usec - now.tv_usec;
if (waittv.tv_usec < 0) {
waittv.tv_usec += 1000000;
waittv.tv_sec--;
}
if (waittv.tv_sec < 0) {
errno = ETIMEDOUT;
fetch_syserr();
return (-1);
}
errno = 0;
r = select(conn->sd + 1, NULL, &writefds, NULL, &waittv);
if (r == -1) {
if (errno == EINTR && fetchRestartCalls)
continue;
return (-1);
}
}
errno = 0;
#ifdef WITH_SSL
if (conn->ssl != NULL)
wlen = SSL_write(conn->ssl, buf, len);
else
#endif
#ifndef MSG_NOSIGNAL
wlen = send(conn->sd, buf, len, 0);
#else
wlen = send(conn->sd, buf, len, MSG_NOSIGNAL);
#endif
if (wlen == 0) {
/* we consider a short write a failure */
errno = EPIPE;
fetch_syserr();
return (-1);
}
if (wlen < 0) {
if (errno == EINTR && fetchRestartCalls)
continue;
return (-1);
}
total += wlen;
buf = (const char *)buf + wlen;
len -= wlen;
}
return (total);
}
/*
* Close connection
*/
int
fetch_close(conn_t *conn)
{
int ret;
#ifdef WITH_SSL
if (conn->ssl) {
SSL_shutdown(conn->ssl);
SSL_set_connect_state(conn->ssl);
SSL_free(conn->ssl);
conn->ssl = NULL;
}
if (conn->ssl_ctx) {
SSL_CTX_free(conn->ssl_ctx);
conn->ssl_ctx = NULL;
}
if (conn->ssl_cert) {
X509_free(conn->ssl_cert);
conn->ssl_cert = NULL;
}
#endif
ret = close(conn->sd);
if (conn->cache_url)
fetchFreeURL(conn->cache_url);
free(conn->ftp_home);
free(conn->buf);
free(conn);
return (ret);
}
/*** Directory-related utility functions *************************************/
int
fetch_add_entry(struct url_list *ue, struct url *base, const char *name,
int pre_quoted)
{
struct url *tmp;
char *tmp_name;
size_t base_doc_len, name_len, i;
unsigned char c;
if (strchr(name, '/') != NULL ||
strcmp(name, "..") == 0 ||
strcmp(name, ".") == 0)
return 0;
if (strcmp(base->doc, "/") == 0)
base_doc_len = 0;
else
base_doc_len = strlen(base->doc);
name_len = 1;
for (i = 0; name[i] != '\0'; ++i) {
if ((!pre_quoted && name[i] == '%') ||
!fetch_urlpath_safe(name[i]))
name_len += 3;
else
++name_len;
}
tmp_name = malloc( base_doc_len + name_len + 1);
if (tmp_name == NULL) {
errno = ENOMEM;
fetch_syserr();
return (-1);
}
if (ue->length + 1 >= ue->alloc_size) {
tmp = realloc(ue->urls, (ue->alloc_size * 2 + 1) * sizeof(*tmp));
if (tmp == NULL) {
free(tmp_name);
errno = ENOMEM;
fetch_syserr();
return (-1);
}
ue->alloc_size = ue->alloc_size * 2 + 1;
ue->urls = tmp;
}
tmp = ue->urls + ue->length;
strcpy(tmp->scheme, base->scheme);
strcpy(tmp->user, base->user);
strcpy(tmp->pwd, base->pwd);
strcpy(tmp->host, base->host);
tmp->port = base->port;
tmp->doc = tmp_name;
memcpy(tmp->doc, base->doc, base_doc_len);
tmp->doc[base_doc_len] = '/';
for (i = base_doc_len + 1; *name != '\0'; ++name) {
if ((!pre_quoted && *name == '%') ||
!fetch_urlpath_safe(*name)) {
tmp->doc[i++] = '%';
c = (unsigned char)*name / 16;
if (c < 10)
tmp->doc[i++] = '0' + c;
else
tmp->doc[i++] = 'a' - 10 + c;
c = (unsigned char)*name % 16;
if (c < 10)
tmp->doc[i++] = '0' + c;
else
tmp->doc[i++] = 'a' - 10 + c;
} else {
tmp->doc[i++] = *name;
}
}
tmp->doc[i] = '\0';
tmp->offset = 0;
tmp->length = 0;
tmp->last_modified = -1;
++ue->length;
return (0);
}
void
fetchInitURLList(struct url_list *ue)
{
ue->length = ue->alloc_size = 0;
ue->urls = NULL;
}
int
fetchAppendURLList(struct url_list *dst, const struct url_list *src)
{
size_t i, j, len;
len = dst->length + src->length;
if (len > dst->alloc_size) {
struct url *tmp;
tmp = realloc(dst->urls, len * sizeof(*tmp));
if (tmp == NULL) {
errno = ENOMEM;
fetch_syserr();
return (-1);
}
dst->alloc_size = len;
dst->urls = tmp;
}
for (i = 0, j = dst->length; i < src->length; ++i, ++j) {
dst->urls[j] = src->urls[i];
dst->urls[j].doc = strdup(src->urls[i].doc);
if (dst->urls[j].doc == NULL) {
while (i-- > 0)
free(dst->urls[j].doc);
fetch_syserr();
return -1;
}
}
dst->length = len;
return 0;
}
void
fetchFreeURLList(struct url_list *ue)
{
size_t i;
for (i = 0; i < ue->length; ++i)
free(ue->urls[i].doc);
free(ue->urls);
ue->length = ue->alloc_size = 0;
}
/*** Authentication-related utility functions ********************************/
static const char *
fetch_read_word(FILE *f)
{
static char word[1024];
if (fscanf(f, " %1023s ", word) != 1)
return (NULL);
return (word);
}
/*
* Get authentication data for a URL from .netrc
*/
int
fetch_netrc_auth(struct url *url)
{
char fn[PATH_MAX];
const char *word;
char *p;
FILE *f;
if ((p = getenv("NETRC")) != NULL) {
if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) {
fetch_info("$NETRC specifies a file name "
"longer than PATH_MAX");
return (-1);
}
} else {
if ((p = getenv("HOME")) != NULL) {
struct passwd *pwd;
if ((pwd = getpwuid(getuid())) == NULL ||
(p = pwd->pw_dir) == NULL)
return (-1);
}
if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn))
return (-1);
}
if ((f = fopen(fn, "r")) == NULL)
return (-1);
while ((word = fetch_read_word(f)) != NULL) {
if (strcmp(word, "default") == 0)
break;
if (strcmp(word, "machine") == 0 &&
(word = fetch_read_word(f)) != NULL &&
strcasecmp(word, url->host) == 0) {
break;
}
}
if (word == NULL)
goto ferr;
while ((word = fetch_read_word(f)) != NULL) {
if (strcmp(word, "login") == 0) {
if ((word = fetch_read_word(f)) == NULL)
goto ferr;
if (snprintf(url->user, sizeof(url->user),
"%s", word) > (int)sizeof(url->user)) {
fetch_info("login name in .netrc is too long");
url->user[0] = '\0';
}
} else if (strcmp(word, "password") == 0) {
if ((word = fetch_read_word(f)) == NULL)
goto ferr;
if (snprintf(url->pwd, sizeof(url->pwd),
"%s", word) > (int)sizeof(url->pwd)) {
fetch_info("password in .netrc is too long");
url->pwd[0] = '\0';
}
} else if (strcmp(word, "account") == 0) {
if ((word = fetch_read_word(f)) == NULL)
goto ferr;
/* XXX not supported! */
} else {
break;
}
}
fclose(f);
return (0);
ferr:
fclose(f);
return (-1);
}
/*
* The no_proxy environment variable specifies a set of domains for
* which the proxy should not be consulted; the contents is a comma-,
* or space-separated list of domain names. A single asterisk will
* override all proxy variables and no transactions will be proxied
* (for compatability with lynx and curl, see the discussion at
* <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>).
*/
int
fetch_no_proxy_match(const char *host)
{
const char *no_proxy, *p, *q;
size_t h_len, d_len;
if ((no_proxy = getenv("NO_PROXY")) == NULL &&
(no_proxy = getenv("no_proxy")) == NULL)
return (0);
/* asterisk matches any hostname */
if (strcmp(no_proxy, "*") == 0)
return (1);
h_len = strlen(host);
p = no_proxy;
do {
/* position p at the beginning of a domain suffix */
while (*p == ',' || isspace((unsigned char)*p))
p++;
/* position q at the first separator character */
for (q = p; *q; ++q)
if (*q == ',' || isspace((unsigned char)*q))
break;
d_len = q - p;
if (d_len > 0 && h_len > d_len &&
strncasecmp(host + h_len - d_len,
p, d_len) == 0) {
/* domain name matches */
return (1);
}
p = q + 1;
} while (*q);
return (0);
}
struct fetchIO {
void *io_cookie;
ssize_t (*io_read)(void *, void *, size_t);
ssize_t (*io_write)(void *, const void *, size_t);
void (*io_close)(void *);
};
void
fetchIO_close(fetchIO *f)
{
if (f->io_close != NULL)
(*f->io_close)(f->io_cookie);
free(f);
}
fetchIO *
fetchIO_unopen(void *io_cookie, ssize_t (*io_read)(void *, void *, size_t),
ssize_t (*io_write)(void *, const void *, size_t),
void (*io_close)(void *))
{
fetchIO *f;
f = malloc(sizeof(*f));
if (f == NULL)
return f;
f->io_cookie = io_cookie;
f->io_read = io_read;
f->io_write = io_write;
f->io_close = io_close;
return f;
}
ssize_t
fetchIO_read(fetchIO *f, void *buf, size_t len)
{
if (f->io_read == NULL)
return EBADF;
return (*f->io_read)(f->io_cookie, buf, len);
}
ssize_t
fetchIO_write(fetchIO *f, const void *buf, size_t len)
{
if (f->io_read == NULL)
return EBADF;
return (*f->io_write)(f->io_cookie, buf, len);
}
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