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Merge remote-tracking branch 'fristonio/ticket-6236'

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This commit is contained in:
Nick Mathewson 2018-03-19 06:42:10 -04:00
commit b0f0c0f550
2 changed files with 76 additions and 112 deletions
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changes/ticket6236 Normal file
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@ -0,0 +1,4 @@
o Minor bugfixes (Duplicate code):
- Remove duplicate code in parse_{c,s}method_line and bootstrap
their functionalities into a single function. Fixes
bug 6236; bugfix on 0.2.3.6-alpha.

184
src/or/transports.c
View File

@ -1025,48 +1025,71 @@ parse_method_error(const char *line, int is_server)
line+strlen(error)+1); line+strlen(error)+1);
} }
/** Parses an SMETHOD <b>line</b> and if well-formed it registers the /** A helper for parse_{c,s}method_line(), bootstraps its
* new transport in <b>mp</b>. */ * functionalities. If <b>is_smethod</b> is true then the
STATIC int * the line to parse is a SMETHOD line otherwise it is a
parse_smethod_line(const char *line, managed_proxy_t *mp) * CMETHOD line*/
static int
parse_method_line_helper(const char *line,
managed_proxy_t *mp,
int is_smethod)
{ {
int item_index = 0;
int r; int r;
smartlist_t *items = NULL;
char *method_name=NULL; char *transport_name=NULL;
char *args_string=NULL; char *args_string=NULL;
char *addrport=NULL; char *addrport=NULL;
tor_addr_t tor_addr; int socks_ver=PROXY_NONE;
char *address=NULL; char *address=NULL;
uint16_t port = 0; uint16_t port = 0;
transport_t *transport=NULL; const char *method_str = is_smethod ? PROTO_SMETHOD : PROTO_CMETHOD;
const int min_args_count = is_smethod ? 3 : 4;
tor_addr_t tor_addr;
transport_t *transport=NULL;
smartlist_t *items= smartlist_new();
items = smartlist_new();
smartlist_split_string(items, line, NULL, smartlist_split_string(items, line, NULL,
SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1); SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);
if (smartlist_len(items) < 3) { if (smartlist_len(items) < min_args_count) {
log_warn(LD_CONFIG, "Server managed proxy sent us a SMETHOD line " log_warn(LD_CONFIG, "Managed proxy sent us a %s line "
"with too few arguments."); "with too few arguments.", method_str);
goto err; goto err;
} }
/* Example of legit SMETHOD line: tor_assert(!strcmp(smartlist_get(items, item_index),method_str));
SMETHOD obfs2 0.0.0.0:25612 ARGS:secret=supersekrit,key=superkey */ ++item_index;
tor_assert(!strcmp(smartlist_get(items,0),PROTO_SMETHOD)); transport_name = smartlist_get(items,item_index);
++item_index;
method_name = smartlist_get(items,1); if (!string_is_C_identifier(transport_name)) {
if (!string_is_C_identifier(method_name)) {
log_warn(LD_CONFIG, "Transport name is not a C identifier (%s).", log_warn(LD_CONFIG, "Transport name is not a C identifier (%s).",
method_name); transport_name);
goto err; goto err;
} }
addrport = smartlist_get(items, 2); /** Check for the proxy method sent to us in CMETHOD line. */
if (!is_smethod) {
const char *socks_ver_str = smartlist_get(items,item_index);
++item_index;
if (!strcmp(socks_ver_str,"socks4")) {
socks_ver = PROXY_SOCKS4;
} else if (!strcmp(socks_ver_str,"socks5")) {
socks_ver = PROXY_SOCKS5;
} else {
log_warn(LD_CONFIG, "Client managed proxy sent us a proxy protocol "
"we don't recognize. (%s)", socks_ver_str);
goto err;
}
}
addrport = smartlist_get(items, item_index);
++item_index;
if (tor_addr_port_split(LOG_WARN, addrport, &address, &port)<0) { if (tor_addr_port_split(LOG_WARN, addrport, &address, &port)<0) {
log_warn(LD_CONFIG, "Error parsing transport " log_warn(LD_CONFIG, "Error parsing transport address '%s'", addrport);
"address '%s'", addrport);
goto err; goto err;
} }
@ -1081,10 +1104,11 @@ parse_smethod_line(const char *line, managed_proxy_t *mp)
goto err; goto err;
} }
if (smartlist_len(items) > 3) { /** Check for options in the SMETHOD line. */
if (is_smethod && smartlist_len(items) > min_args_count) {
/* Seems like there are also some [options] in the SMETHOD line. /* Seems like there are also some [options] in the SMETHOD line.
Let's see if we can parse them. */ Let's see if we can parse them. */
char *options_string = smartlist_get(items, 3); char *options_string = smartlist_get(items, item_index);
log_debug(LD_CONFIG, "Got options_string: %s", options_string); log_debug(LD_CONFIG, "Got options_string: %s", options_string);
if (!strcmpstart(options_string, "ARGS:")) { if (!strcmpstart(options_string, "ARGS:")) {
args_string = options_string+strlen("ARGS:"); args_string = options_string+strlen("ARGS:");
@ -1092,15 +1116,20 @@ parse_smethod_line(const char *line, managed_proxy_t *mp)
} }
} }
transport = transport_new(&tor_addr, port, method_name, transport = transport_new(&tor_addr, port, transport_name,
PROXY_NONE, args_string); socks_ver, args_string);
smartlist_add(mp->transports, transport); smartlist_add(mp->transports, transport);
/* For now, notify the user so that they know where the server /** Logs info about line parsing success for client or server */
transport is listening. */ if (is_smethod) {
log_info(LD_CONFIG, "Server transport %s at %s:%d.", log_info(LD_CONFIG, "Server transport %s at %s:%d.",
method_name, address, (int)port); transport_name, address, (int)port);
} else {
log_info(LD_CONFIG, "Transport %s at %s:%d with SOCKS %d. "
"Attached to managed proxy.",
transport_name, address, (int)port, socks_ver);
}
r=0; r=0;
goto done; goto done;
@ -1115,93 +1144,24 @@ parse_smethod_line(const char *line, managed_proxy_t *mp)
return r; return r;
} }
/** Parses an SMETHOD <b>line</b> and if well-formed it registers the
* new transport in <b>mp</b>. */
STATIC int
parse_smethod_line(const char *line, managed_proxy_t *mp)
{
/* Example of legit SMETHOD line:
SMETHOD obfs2 0.0.0.0:25612 ARGS:secret=supersekrit,key=superkey */
return parse_method_line_helper(line, mp, 1);
}
/** Parses a CMETHOD <b>line</b>, and if well-formed it registers /** Parses a CMETHOD <b>line</b>, and if well-formed it registers
* the new transport in <b>mp</b>. */ * the new transport in <b>mp</b>. */
STATIC int STATIC int
parse_cmethod_line(const char *line, managed_proxy_t *mp) parse_cmethod_line(const char *line, managed_proxy_t *mp)
{ {
int r; /* Example of legit CMETHOD line:
smartlist_t *items = NULL; CMETHOD obfs2 socks5 127.0.0.1:35713 */
return parse_method_line_helper(line, mp, 0);
char *method_name=NULL;
char *socks_ver_str=NULL;
int socks_ver=PROXY_NONE;
char *addrport=NULL;
tor_addr_t tor_addr;
char *address=NULL;
uint16_t port = 0;
transport_t *transport=NULL;
items = smartlist_new();
smartlist_split_string(items, line, NULL,
SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);
if (smartlist_len(items) < 4) {
log_warn(LD_CONFIG, "Client managed proxy sent us a CMETHOD line "
"with too few arguments.");
goto err;
}
tor_assert(!strcmp(smartlist_get(items,0),PROTO_CMETHOD));
method_name = smartlist_get(items,1);
if (!string_is_C_identifier(method_name)) {
log_warn(LD_CONFIG, "Transport name is not a C identifier (%s).",
method_name);
goto err;
}
socks_ver_str = smartlist_get(items,2);
if (!strcmp(socks_ver_str,"socks4")) {
socks_ver = PROXY_SOCKS4;
} else if (!strcmp(socks_ver_str,"socks5")) {
socks_ver = PROXY_SOCKS5;
} else {
log_warn(LD_CONFIG, "Client managed proxy sent us a proxy protocol "
"we don't recognize. (%s)", socks_ver_str);
goto err;
}
addrport = smartlist_get(items, 3);
if (tor_addr_port_split(LOG_WARN, addrport, &address, &port)<0) {
log_warn(LD_CONFIG, "Error parsing transport "
"address '%s'", addrport);
goto err;
}
if (!port) {
log_warn(LD_CONFIG,
"Transport address '%s' has no port.", addrport);
goto err;
}
if (tor_addr_parse(&tor_addr, address) < 0) {
log_warn(LD_CONFIG, "Error parsing transport address '%s'", address);
goto err;
}
transport = transport_new(&tor_addr, port, method_name, socks_ver, NULL);
smartlist_add(mp->transports, transport);
log_info(LD_CONFIG, "Transport %s at %s:%d with SOCKS %d. "
"Attached to managed proxy.",
method_name, address, (int)port, socks_ver);
r=0;
goto done;
err:
r = -1;
done:
SMARTLIST_FOREACH(items, char*, s, tor_free(s));
smartlist_free(items);
tor_free(address);
return r;
} }
/** Parses an PROXY-ERROR <b>line</b> and warns the user accordingly. */ /** Parses an PROXY-ERROR <b>line</b> and warns the user accordingly. */