commit 0e453929d21b030832b0c48fceac0c5688657e15 Author: rl1987 rl1987@sdf.lonestar.org Date: Sun Feb 11 15:22:41 2018 +0100

Allow IPv6 address strings to be used as hostnames in SOCKS5 requests --- src/common/util.c | 11 +++++++++++ src/common/util.h | 1 + src/or/proto_socks.c | 4 ++-- src/test/test_socks.c | 9 +++++---- 4 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/src/common/util.c b/src/common/util.c index 90204befc..1818b4f19 100644 --- a/src/common/util.c +++ b/src/common/util.c @@ -1071,6 +1071,17 @@ string_is_valid_ipv6_address(const char *string) return (tor_inet_pton(AF_INET6,string,&addr) == 1); }

+/** Return true iff <b>string</b> is a valid destination address, + * i.e. either a DNS hostname or IPv4/IPv6 address string. + */ +int +string_is_valid_dest(const char *string) +{ + return string_is_valid_ipv4_address(string) || + string_is_valid_ipv6_address(string) || + string_is_valid_hostname(string); +} + /** Return true iff <b>string</b> matches a pattern of DNS names * that we allow Tor clients to connect to. * diff --git a/src/common/util.h b/src/common/util.h index 2ee0ea28c..d6bda8036 100644 --- a/src/common/util.h +++ b/src/common/util.h @@ -233,6 +233,7 @@ const char *find_str_at_start_of_line(const char *haystack, const char *needle); int string_is_C_identifier(const char *string); int string_is_key_value(int severity, const char *string); +int string_is_valid_dest(const char *string); int string_is_valid_hostname(const char *string); int string_is_valid_ipv4_address(const char *string); int string_is_valid_ipv6_address(const char *string); diff --git a/src/or/proto_socks.c b/src/or/proto_socks.c index 91633d02a..8700fe126 100644 --- a/src/or/proto_socks.c +++ b/src/or/proto_socks.c @@ -393,7 +393,7 @@ parse_socks(const char *data, size_t datalen, socks_request_t *req, req->port = ntohs(get_uint16(data+5+len)); *drain_out = 5+len+2;

- if (!string_is_valid_hostname(req->address)) { + if (!string_is_valid_dest(req->address)) { socks_request_set_socks5_error(req, SOCKS5_GENERAL_ERROR);

log_warn(LD_PROTOCOL, @@ -518,7 +518,7 @@ parse_socks(const char *data, size_t datalen, socks_request_t *req, log_debug(LD_APP,"socks4: Everything is here. Success."); strlcpy(req->address, startaddr ? startaddr : tmpbuf, sizeof(req->address)); - if (!string_is_valid_hostname(req->address)) { + if (!string_is_valid_dest(req->address)) { log_warn(LD_PROTOCOL, "Your application (using socks4 to port %d) gave Tor " "a malformed hostname: %s. Rejecting the connection.", diff --git a/src/test/test_socks.c b/src/test/test_socks.c index 9ae7530e2..70509e43e 100644 --- a/src/test/test_socks.c +++ b/src/test/test_socks.c @@ -347,17 +347,18 @@ test_socks_5_supported_commands(void *ptr)

socks_request_clear(socks);

- /* SOCKS 5 should NOT reject RESOLVE [F0] reject for IPv6 address + /* SOCKS 5 should NOT reject RESOLVE [F0] request for IPv6 address * string if SafeSocks is enabled. */

ADD_DATA(buf, "\x05\x01\x00"); - ADD_DATA(buf, "\x05\xF0\x00\x03\x27"); - ADD_DATA(buf, "2001:0db8:85a3:0000:0000:8a2e:0370:7334"); + ADD_DATA(buf, "\x05\xF0\x00\x03\x29"); + ADD_DATA(buf, "[2001:0db8:85a3:0000:0000:8a2e:0370:7334]"); ADD_DATA(buf, "\x01\x02"); tt_int_op(fetch_from_buf_socks(buf, socks, get_options()->TestSocks, 1), OP_EQ, -1);

- tt_str_op("2001:0db8:85a3:0000:0000:8a2e:0370:7334", OP_EQ, socks->address); + tt_str_op("[2001:0db8:85a3:0000:0000:8a2e:0370:7334]", OP_EQ, + socks->address); tt_int_op(258, OP_EQ, socks->port);

tt_int_op(0, OP_EQ, buf_datalen(buf));