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wget: run s_client helper with -servername HOST

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This is necessary for multi-hosted TLSed web sites.

function                                             old     new   delta
spawn_https_helper_openssl                           334     441    +107

Based on a patch by Jeremy Chadwick <jdc@koitsu.org>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2016-07-25 21:34:57 +02:00
parent 9d20297ba8
commit ed72761843
1 changed files with 44 additions and 5 deletions
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49
networking/wget.c
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@ -62,9 +62,10 @@
//config: a helper program to talk over HTTPS.
//config:
//config: OpenSSL has a simple SSL client for debug purposes.
//config: If you select "openssl" helper, wget will effectively call
//config: "openssl s_client -quiet -connect IP:443 2>/dev/null"
//config: and pipe its data through it.
//config: If you select "openssl" helper, wget will effectively run:
//config: "openssl s_client -quiet -connect hostname:443
//config: -servername hostname 2>/dev/null" and pipe its data
//config: through it. -servername is not used if hostname is numeric.
//config: Note inconvenient API: host resolution is done twice,
//config: and there is no guarantee openssl's idea of IPv6 address
//config: format is the same as ours.
@ -349,6 +350,30 @@ static void set_alarm(void)
# define clear_alarm() ((void)0)
#endif
#if ENABLE_FEATURE_WGET_OPENSSL
/*
* is_ip_address() attempts to verify whether or not a string
* contains an IPv4 or IPv6 address (vs. an FQDN). The result
* of inet_pton() can be used to determine this.
*
* TODO add proper error checking when inet_pton() returns -1
* (some form of system error has occurred, and errno is set)
*/
static int is_ip_address(const char *string)
{
struct sockaddr_in sa;
int result = inet_pton(AF_INET, string, &(sa.sin_addr));
# if ENABLE_FEATURE_IPV6
if (result == 0) {
struct sockaddr_in6 sa6;
result = inet_pton(AF_INET6, string, &(sa6.sin6_addr));
}
# endif
return (result == 1);
}
#endif
static FILE *open_socket(len_and_sockaddr *lsa)
{
int fd;
@ -629,6 +654,7 @@ static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_
static int spawn_https_helper_openssl(const char *host, unsigned port)
{
char *allocated = NULL;
char *servername;
int sp[2];
int pid;
IF_FEATURE_WGET_SSL_HELPER(volatile int child_failed = 0;)
@ -639,12 +665,14 @@ static int spawn_https_helper_openssl(const char *host, unsigned port)
if (!strchr(host, ':'))
host = allocated = xasprintf("%s:%u", host, port);
servername = xstrdup(host);
strrchr(servername, ':')[0] = '\0';
fflush_all();
pid = xvfork();
if (pid == 0) {
/* Child */
char *argv[6];
char *argv[8];
close(sp[0]);
xmove_fd(sp[1], 0);
@ -656,12 +684,22 @@ static int spawn_https_helper_openssl(const char *host, unsigned port)
*/
xmove_fd(2, 3);
xopen("/dev/null", O_RDWR);
memset(&argv, 0, sizeof(argv));
argv[0] = (char*)"openssl";
argv[1] = (char*)"s_client";
argv[2] = (char*)"-quiet";
argv[3] = (char*)"-connect";
argv[4] = (char*)host;
argv[5] = NULL;
/*
* Per RFC 6066 Section 3, the only permitted values in the
* TLS server_name (SNI) field are FQDNs (DNS hostnames).
* IPv4 and IPv6 addresses, port numbers are not allowed.
*/
if (!is_ip_address(servername)) {
argv[5] = (char*)"-servername";
argv[6] = (char*)servername;
}
BB_EXECVP(argv[0], argv);
xmove_fd(3, 2);
# if ENABLE_FEATURE_WGET_SSL_HELPER
@ -674,6 +712,7 @@ static int spawn_https_helper_openssl(const char *host, unsigned port)
}
/* Parent */
free(servername);
free(allocated);
close(sp[1]);
# if ENABLE_FEATURE_WGET_SSL_HELPER