- stunnel-users - stunnel.org

STUNNEL --- How to chose the AES cipher with TLS v1.2
by Editor 14 Feb '13

14 Feb '13

Hi to all: In reading the FAQ and looking at the sample configuration file, I do not see an example of how to correctly configure the application to use the more current AES-256 or the AES-128 cipher configurations. I do have the current OpenSSL on the host (a Sun SPARC box). The idea is to use this host as a SSL proxy for a number of services. I did see this reference: options = CIPHER_SERVER_PREFERENCE But not how to then set the SSL cipher except as I found on Google. There was this on the MAN page but it seems to fail in my configuration: ciphers = cipherlist Select permitted SSL ciphers. A colon delimited list of the ciphers to allow in the SSL connection. For example DES-CBC3-SHA:IDEA-CBC-MD5 Thanks. Kevin Reference Ciphers supported by OpenSSL: http://www.openssl.org/docs/apps/ciphers.html

2 1

stunnel port question
by Stewart Anderson 13 Feb '13

13 Feb '13

Hi all, ty in advance for any help. I have a service that I can connect to a destination over stunnel, but I am not able to get the ack I expect. Internal sending service => stunnel => external listening service I think the problem may be that the firewall is blocking inbound traffic. I need to specify a specific port for the firewall team to open so that traffic can get back to my stunnel service, since every time stunnel starts it will be making a connection from a different port on the external facing side of the SSL encapsulation service/pipe/whatever you want to call it!! What would be the best way to configure stunnel for that scenario. I can see the INETD mode but that does not seem to be what I am looking for, I can also see the transparent option but not sure what that really does. Any advice appreciated. Regards Stewart Your Hospital needs YOU! We need you to register as a Public, Patient or Staff member and help shape the future of your healthcare. Call 0800 280 2581 to register by phone or you can email bradfordhospitals(a)capitaregistrars.com<mailto:[email protected]> and ask to be registered as a new member. For more information about our hospitals and Foundation Trust Membership please visit www.bradfordhospitals.nhs.uk<http://www.bradfordhospitals.nhs.uk> This message is confidential. It may also contain privileged information. The contents of this e-mail and any attachments are intended for the named addressee only. Unless you are the named addressee or authorised to receive the e-mail of the named addressee you may not disclose, use or copy the contents of the e-mail. If you are not the person for whom the message was intended, please notify the sender immediately at Bradford Teaching Hospitals NHS Foundation Trust and delete the material from your computer. You must not use the message for any other purpose, nor disclose its contents to any person other than the intended recipient. Bradford Teaching Hospitals NHS Foundation Trust does not accept responsibility for this message and any views or opinions contained in this e-mail are solely those of the author unless expressly stated otherwise.

1 0

Stunnel over a separate proxy?
by Alex Gottschalk 12 Feb '13

12 Feb '13

I've successfully deployed stunnel4 to wrap rsync for transferring data between remote sites and a central repository. The issue I'm running into, is that some of these sites mandate use of a proxy (HTTP or SOCKS5 usually) for outbound network connections. It seems like there is some proxy support in stunnel with the protocol{Host,Authentication,etc} configuration options, but I have had zero luck getting them to work. For example, I've tried making a simple SOCKS5 proxy using ssh, that I'm successfully able to send HTTP traffic over: ssh -g -D1080 proxy-host # create the proxy, open port 1080 on a public interface then in the client stunnel.conf: [rsync] protocol = connect protocolHost = proxy-host:1080 accept = 127.0.0.1:873 connect = rsync-destination:443 Keep in mind this is an already-working stunnel - the only difference is the addition of the protocol and protocolHost lines above. When I run stunnel in the foreground with that configuration change, I get the following error trying to run rsync: $ rsync -v dev.inst.kvpdata rsync://localhost/putdata/ rsync: read error: Connection reset by peer (104) rsync error: error in rsync protocol data stream (code 12) at io.c(605) [sender=2.6.9] And no log messages appear in stunnel's stderr whatsoever. What am I doing wrong? I get identical results using an HTTP proxy with squid, instead of the socks5 proxy. Thanks, please let me know if there's any more information I should include to help with figuring this out. Alex Gottschalk

3 4

transfer() loop executes not transferring any data and truncated data when using unix sockets
by Stephen Balukoff 08 Feb '13

08 Feb '13

Hello! Recently we started seeing some erroneous behavior in one of our load balancer configurations in which we're using stunnel for SSL tunnel termination with web clients. Specifically, the setup looks like the following: Web client ---(SSL)---> stunnel ---(unix socket)--> haproxy ---(tcp/http)---> web server After extensive troubleshooting we were able to determine that when the following parameters are present: * Client forces non-keepalive connection * Client generates a POST request, the response to which (generated by the back-end web server) is greater than about 8k * stunnel and haproxy communicate via unix socket ...then most responses end up being truncated by an extraneous TCP RST packet from stunnel, and the following log lines are generated: Jan 23 15:24:17 ds420a stunnel: LOG3[22586:139835614443264]: transfer() loop executes not transferring any data Jan 23 15:24:17 ds420a stunnel: LOG3[22586:139835614443264]: please report the problem to Michal.Trojnara(a)mirt.net Jan 23 15:24:17 ds420a stunnel: LOG3[22586:139835614443264]: stunnel 4.54 on x86_64-unknown-linux-gnu platform Jan 23 15:24:17 ds420a stunnel: LOG3[22586:139835614443264]: Compiled/running with OpenSSL 1.0.0-fips 29 Mar 2010 Jan 23 15:24:17 ds420a stunnel: LOG3[22586:139835614443264]: Threading:PTHREAD SSL:+ENGINE+OCSP+FIPS Auth:none Sockets:POLL+IPv6 Jan 23 15:24:17 ds420a stunnel: LOG3[22586:139835614443264]: protocol=TLSv1, SSL_pending=0 Jan 23 15:24:17 ds420a stunnel: LOG3[22586:139835614443264]: sock_open_rd=n, sock_open_wr=Y Jan 23 15:24:17 ds420a stunnel: LOG3[22586:139835614443264]: SSL_RECEIVED_SHUTDOWN=n, SSL_SENT_SHUTDOWN=Y Jan 23 15:24:17 ds420a stunnel: LOG3[22586:139835614443264]: sock_can_rd=Y, sock_can_wr=n Jan 23 15:24:17 ds420a stunnel: LOG3[22586:139835614443264]: ssl_can_rd=n, ssl_can_wr=n Jan 23 15:24:17 ds420a stunnel: LOG3[22586:139835614443264]: read_wants_read=Y, read_wants_write=n Jan 23 15:24:17 ds420a stunnel: LOG3[22586:139835614443264]: write_wants_read=n, write_wants_write=n Jan 23 15:24:17 ds420a stunnel: LOG3[22586:139835614443264]: shutdown_wants_read=n, shutdown_wants_write=n Jan 23 15:24:17 ds420a stunnel: LOG3[22586:139835614443264]: socket input buffer: 0 byte(s), ssl input buffer: 0 byte(s) The work arounds we have found are either: 1. Make stunnel and haproxy communicate over a TCP socket bound to the loopback interface (less ideal, as then we're limited to 65k connections) 2. Add the "reset=no" parameter to our stunnel.conf (which seems to fix the problem, but makes me wonder if we're not opening ourselves up to other problems-- like really getting stuck in an infinite loop that that watchdog is intended to avoid.) In any case based on what "reset=no" is supposed to do as well as where that first line of the error output above is being generated in the code, it's clear that the main client data transfer loop in client.c (starting line 519) is being called too often with no data to transfer, which triggers the infinite loop detection in the transfer() function (client.c, starting line 832). My best hypothesis at this point is that the transfer() code was written only with TCP sockets in mind, and that something about the unix socket in use here is triggering that loop too often. Maybe s_poll_wait on line 541 is being called with parameters which are right for a TCP socket but inappropriate for a unix socket? At this point though, we're at the limit of my socket programming ability, so I'm a little stuck. (Would like to have simply fixed this and submitted a patch... but cest la vie, eh.) We'd like to avoid using a TCP socket to communicate between stunnel and haproxy simply because it's a little less efficient, and because there's an artificial 65k limit on the number of back-end connections we can support per loopback IP if we do that. Alternatively, if someone could verify that "reset=no" is an acceptable / safe work around in this case, I'd appreciate that (though, of course, I'd prefer my logs not to get spammed on every connection. :P ) Is there any other data I can provide to help troubleshoot and fix this? Thanks, Stephen -- Stephen Balukoff Blue Box Group, LLC (800)613-4305 x807

3 3

LZ4
by Death Master 06 Feb '13

06 Feb '13

Do you plan adding LZ4(much faster than gzip) support to stunnel?

2 1

Re: [stunnel-users] fix resource leaks and potential null
by Arthur Mesh 05 Feb '13

05 Feb '13

dereferences in 4.54 Reply-To: In-Reply-To: <mailman.1.1359889202.25775.stunnel-users(a)stunnel.org> On Sun, Feb 03, 2013 at 12:00:02PM +0100, stunnel-users-request(a)stunnel.org wrote: > > - char line_text[CONFLINELEN], *errstr; > > + char line_text[CONFLINELEN], *errstr = NULL; > Were you able to identify a case where it's used without > initialization? This is interesting. > It would be a good idea to fix it there instead of implementing a > workaround here. Hi, I will provide the output of coverity run for these defect: int parse_conf(char *name, CONF_TYPE type) { 1997 DISK_FILE *df; At (1): Declaring variable "errstr" without initializer. 1998 char line_text[CONFLINELEN], *errstr; 1999 char config_line[CONFLINELEN], *config_opt, *config_arg; 2000 int line_number, i; 2001 SERVICE_OPTIONS *section, *new_section; 2002 static char *filename=NULL; /* a copy of config file name for reloading */ 2003#ifndef USE_WIN32 2004 int fd; 2005 char *tmpstr; 2006#endif 2007 At (2): Condition "name", taking true branch 2008 if(name) /* not reload */ 2009 filename=str_dup(name); 2010 At (3): Condition "type == 2U", taking true branch 2011 s_log(LOG_NOTICE, "Reading configuration from %s %s", 2012 type==CONF_FD ? "descriptor" : "file", filename); 2013#ifndef USE_WIN32 At (4): Condition "type == 2U", taking true branch 2014 if(type==CONF_FD) { /* file descriptor */ 2015 fd=strtol(filename, &tmpstr, 10); At (5): Condition "tmpstr == filename", taking false branch At (6): Condition "*tmpstr", taking false branch 2016 if(tmpstr==filename || *tmpstr) { /* not a number */ 2017 s_log(LOG_ERR, "Invalid file descriptor number"); 2018 print_syntax(); 2019 return 1; 2020 } 2021 df=file_fdopen(fd); At (7): Falling through to end of if statement 2022 } else 2023#endif 2024 df=file_open(filename, 0); At (8): Condition "!df", taking false branch 2025 if(!df) { 2026 s_log(LOG_ERR, "Cannot read configuration"); 2027 if(type!=CONF_RELOAD) 2028 print_syntax(); 2029 return 1; 2030 } 2031 2032 memset(&new_global_options, 0, sizeof(GLOBAL_OPTIONS)); /* reset global options */ 2033 memset(&new_service_options, 0, sizeof(SERVICE_OPTIONS)); /* reset local options */ 2034 new_service_options.next=NULL; 2035 section=&new_service_options; 2036 parse_global_option(CMD_BEGIN, NULL, NULL); 2037 parse_service_option(CMD_BEGIN, section, NULL, NULL); At (9): Condition "type != 0U", taking true branch 2038 if(type!=CONF_RELOAD) { /* provide defaults for gui.c */ 2039 memcpy(&global_options, &new_global_options, sizeof(GLOBAL_OPTIONS)); 2040 memcpy(&service_options, &new_service_options, sizeof(SERVICE_OPTIONS)); 2041 } 2042 2043 line_number=0; At (10): Condition "file_getline(df, line_text, 16384) >= 0", taking true branch At (19): Condition "file_getline(df, line_text, 16384) >= 0", taking false branch 2044 while(file_getline(df, line_text, CONFLINELEN)>=0) { 2045 memcpy(config_line, line_text, CONFLINELEN); 2046 ++line_number; 2047 config_opt=config_line; At (11): Condition "__istype((unsigned char)*config_opt, 16384UL)", taking true branch At (12): Condition "__istype((unsigned char)*config_opt, 16384UL)", taking false branch 2048 while(isspace((unsigned char)*config_opt)) 2049 ++config_opt; /* remove initial whitespaces */ At (13): Condition "i >= 0", taking true branch At (14): Condition "__istype((unsigned char)config_opt[i], 16384UL)", taking true branch At (15): Condition "i >= 0", taking true branch At (16): Condition "__istype((unsigned char)config_opt[i], 16384UL)", taking false branch 2050 for(i=strlen(config_opt)-1; i>=0 && isspace((unsigned char)config_opt[i]); --i) 2051 config_opt[i]='\0'; /* remove trailing whitespaces */ At (17): Condition "config_opt[0] == 0", taking true branch 2052 if(config_opt[0]=='\0' || config_opt[0]=='#' || config_opt[0]==';') /* empty or comment */ At (18): Continuing loop 2053 continue; 2054 if(config_opt[0]=='[' && config_opt[strlen(config_opt)-1]==']') { /* new section */ 2055 if(!new_service_options.next) { 2056 errstr=parse_global_option(CMD_END, NULL, NULL); 2057 if(errstr) { 2058 s_log(LOG_ERR, "Line %d: \"%s\": %s", line_number, line_text, errstr); 2059 file_close(df); 2060 return 1; 2061 } 2062 } 2063 ++config_opt; 2064 config_opt[strlen(config_opt)-1]='\0'; 2065 new_section=str_alloc(sizeof(SERVICE_OPTIONS)); 2066 memcpy(new_section, &new_service_options, sizeof(SERVICE_OPTIONS)); 2067 new_section->servname=str_dup(config_opt); 2068 new_section->session=NULL; 2069 new_section->next=NULL; 2070 section->next=new_section; 2071 section=new_section; 2072 continue; 2073 } 2074 config_arg=strchr(config_line, '='); 2075 if(!config_arg) { 2076 s_log(LOG_ERR, "Line %d: \"%s\": No '=' found", line_number, line_text); 2077 file_close(df); 2078 return 1; 2079 } 2080 *config_arg++='\0'; /* split into option name and argument value */ 2081 for(i=strlen(config_opt)-1; i>=0 && isspace((unsigned char)config_opt[i]); --i) 2082 config_opt[i]='\0'; /* remove trailing whitespaces */ 2083 while(isspace((unsigned char)*config_arg)) 2084 ++config_arg; /* remove initial whitespaces */ 2085 errstr=parse_service_option(CMD_EXEC, section, config_opt, config_arg); 2086 if(!new_service_options.next && errstr==option_not_found) 2087 errstr=parse_global_option(CMD_EXEC, config_opt, config_arg); 2088 if(errstr) { 2089 s_log(LOG_ERR, "Line %d: \"%s\": %s", line_number, line_text, errstr); 2090 file_close(df); 2091 return 1; 2092 } 2093 } 2094 file_close(df); 2095 At (20): Condition "new_service_options.next", taking true branch 2096 if(new_service_options.next) { /* daemon mode: initialize sections */ At (21): Condition "section", taking false branch 2097 for(section=new_service_options.next; section; section=section->next) { 2098 s_log(LOG_INFO, "Initializing service [%s]", section->servname); 2099 errstr=parse_service_option(CMD_END, section, NULL, NULL); 2100 if(errstr) 2101 break; 2102 } At (22): Falling through to end of if statement 2103 } else { /* inetd mode: need to initialize global options */ 2104 errstr=parse_global_option(CMD_END, NULL, NULL); 2105 if(errstr) { 2106 s_log(LOG_ERR, "Global options: %s", errstr); 2107 return 1; 2108 } 2109 s_log(LOG_INFO, "Initializing inetd mode configuration"); 2110 section=&new_service_options; 2111 errstr=parse_service_option(CMD_END, section, NULL, NULL); 2112 } CID 32706: Uninitialized pointer read (UNINIT)At (23): Using uninitialized value "errstr". 2113 if(errstr) { CID 32693: Dereference after null check (FORWARD_NULL) [select defect] 2114 s_log(LOG_ERR, "Service [%s]: %s", section->servname, errstr); 2115 return 1; 2116 } > > - s_log(LOG_ERR, "Service [%s]: %s", section->servname, errstr); > > + s_log(LOG_ERR, "Service [%s]: %s", section ? section->servname : "", > > + errstr); > Again it would be useful to fix the root cause instead of implementing a > workaround. Coverity output: At (1): Condition "name", taking true branch 2008 if(name) /* not reload */ 2009 filename=str_dup(name); 2010 At (2): Condition "type == 2U", taking true branch 2011 s_log(LOG_NOTICE, "Reading configuration from %s %s", 2012 type==CONF_FD ? "descriptor" : "file", filename); 2013#ifndef USE_WIN32 At (3): Condition "type == 2U", taking true branch 2014 if(type==CONF_FD) { /* file descriptor */ 2015 fd=strtol(filename, &tmpstr, 10); At (4): Condition "tmpstr == filename", taking false branch At (5): Condition "*tmpstr", taking false branch 2016 if(tmpstr==filename || *tmpstr) { /* not a number */ 2017 s_log(LOG_ERR, "Invalid file descriptor number"); 2018 print_syntax(); 2019 return 1; 2020 } 2021 df=file_fdopen(fd); At (6): Falling through to end of if statement 2022 } else 2023#endif 2024 df=file_open(filename, 0); At (7): Condition "!df", taking false branch 2025 if(!df) { 2026 s_log(LOG_ERR, "Cannot read configuration"); 2027 if(type!=CONF_RELOAD) 2028 print_syntax(); 2029 return 1; 2030 } 2031 2032 memset(&new_global_options, 0, sizeof(GLOBAL_OPTIONS)); /* reset global options */ 2033 memset(&new_service_options, 0, sizeof(SERVICE_OPTIONS)); /* reset local options */ 2034 new_service_options.next=NULL; 2035 section=&new_service_options; 2036 parse_global_option(CMD_BEGIN, NULL, NULL); 2037 parse_service_option(CMD_BEGIN, section, NULL, NULL); At (8): Condition "type != 0U", taking true branch 2038 if(type!=CONF_RELOAD) { /* provide defaults for gui.c */ 2039 memcpy(&global_options, &new_global_options, sizeof(GLOBAL_OPTIONS)); 2040 memcpy(&service_options, &new_service_options, sizeof(SERVICE_OPTIONS)); 2041 } 2042 2043 line_number=0; At (9): Condition "file_getline(df, line_text, 16384) >= 0", taking true branch At (18): Condition "file_getline(df, line_text, 16384) >= 0", taking false branch 2044 while(file_getline(df, line_text, CONFLINELEN)>=0) { 2045 memcpy(config_line, line_text, CONFLINELEN); 2046 ++line_number; 2047 config_opt=config_line; At (10): Condition "__istype((unsigned char)*config_opt, 16384UL)", taking true branch At (11): Condition "__istype((unsigned char)*config_opt, 16384UL)", taking false branch 2048 while(isspace((unsigned char)*config_opt)) 2049 ++config_opt; /* remove initial whitespaces */ At (12): Condition "i >= 0", taking true branch At (13): Condition "__istype((unsigned char)config_opt[i], 16384UL)", taking true branch At (14): Condition "i >= 0", taking true branch At (15): Condition "__istype((unsigned char)config_opt[i], 16384UL)", taking false branch 2050 for(i=strlen(config_opt)-1; i>=0 && isspace((unsigned char)config_opt[i]); --i) 2051 config_opt[i]='\0'; /* remove trailing whitespaces */ At (16): Condition "config_opt[0] == 0", taking true branch 2052 if(config_opt[0]=='\0' || config_opt[0]=='#' || config_opt[0]==';') /* empty or comment */ At (17): Continuing loop 2053 continue; 2054 if(config_opt[0]=='[' && config_opt[strlen(config_opt)-1]==']') { /* new section */ 2055 if(!new_service_options.next) { 2056 errstr=parse_global_option(CMD_END, NULL, NULL); 2057 if(errstr) { 2058 s_log(LOG_ERR, "Line %d: \"%s\": %s", line_number, line_text, errstr); 2059 file_close(df); 2060 return 1; 2061 } 2062 } 2063 ++config_opt; 2064 config_opt[strlen(config_opt)-1]='\0'; 2065 new_section=str_alloc(sizeof(SERVICE_OPTIONS)); 2066 memcpy(new_section, &new_service_options, sizeof(SERVICE_OPTIONS)); 2067 new_section->servname=str_dup(config_opt); 2068 new_section->session=NULL; 2069 new_section->next=NULL; 2070 section->next=new_section; 2071 section=new_section; 2072 continue; 2073 } 2074 config_arg=strchr(config_line, '='); 2075 if(!config_arg) { 2076 s_log(LOG_ERR, "Line %d: \"%s\": No '=' found", line_number, line_text); 2077 file_close(df); 2078 return 1; 2079 } 2080 *config_arg++='\0'; /* split into option name and argument value */ 2081 for(i=strlen(config_opt)-1; i>=0 && isspace((unsigned char)config_opt[i]); --i) 2082 config_opt[i]='\0'; /* remove trailing whitespaces */ 2083 while(isspace((unsigned char)*config_arg)) 2084 ++config_arg; /* remove initial whitespaces */ 2085 errstr=parse_service_option(CMD_EXEC, section, config_opt, config_arg); 2086 if(!new_service_options.next && errstr==option_not_found) 2087 errstr=parse_global_option(CMD_EXEC, config_opt, config_arg); 2088 if(errstr) { 2089 s_log(LOG_ERR, "Line %d: \"%s\": %s", line_number, line_text, errstr); 2090 file_close(df); 2091 return 1; 2092 } 2093 } 2094 file_close(df); 2095 At (19): Condition "new_service_options.next", taking true branch 2096 if(new_service_options.next) { /* daemon mode: initialize sections */ At (20): Comparing "section" to null implies that "section" might be null. At (21): Condition "section", taking false branch 2097 for(section=new_service_options.next; section; section=section->next) { 2098 s_log(LOG_INFO, "Initializing service [%s]", section->servname); 2099 errstr=parse_service_option(CMD_END, section, NULL, NULL); 2100 if(errstr) 2101 break; 2102 } At (22): Falling through to end of if statement 2103 } else { /* inetd mode: need to initialize global options */ 2104 errstr=parse_global_option(CMD_END, NULL, NULL); 2105 if(errstr) { 2106 s_log(LOG_ERR, "Global options: %s", errstr); 2107 return 1; 2108 } 2109 s_log(LOG_INFO, "Initializing inetd mode configuration"); 2110 section=&new_service_options; 2111 errstr=parse_service_option(CMD_END, section, NULL, NULL); 2112 } CID 32706: Uninitialized pointer read (UNINIT) [select defect] At (23): Condition "errstr", taking true branch 2113 if(errstr) { CID 32693: Dereference after null check (FORWARD_NULL)At (24): Dereferencing null pointer "section". 2114 s_log(LOG_ERR, "Service [%s]: %s", section->servname, errstr); 2115 return 1; 2116 } > > - if(!strcasecmp(fl->name, string)) { > > + if(string && !strcasecmp(fl->name, string)) { > Could you give an example parameter where "string" may be NULL here? 2238/* facilities only make sense on Unix */ 2239#if !defined (USE_WIN32) && !defined (__vms) At (1): Condition "strchr(string, 46)", taking true branch 2240 if(strchr(string, '.')) { /* we have a facility specified */ 2241 new_global_options.facility=-1; 2242 string=strtok(arg_copy, "."); /* break it up */ 2243 At (2): Condition "fl->name", taking true branch 2244 for(fl=facilities; fl->name; ++fl) { At (3): Condition "!strcasecmp(fl->name, string)", taking true branch 2245 if(!strcasecmp(fl->name, string)) { 2246 new_global_options.facility=fl->value; At (4): Breaking from loop 2247 break; 2248 } 2249 } At (5): Condition "new_global_options.facility == -1", taking false branch 2250 if(new_global_options.facility==-1) 2251 return 1; /* FAILED */ 2252 string=strtok(NULL, "."); /* set to the remainder */ 2253 } 2254#endif /* USE_WIN32, __vms */ 2255 2256 /* time to check the syslog level */ At (6): Comparing "string" to null implies that "string" might be null. At (7): Condition "string", taking false branch 2257 if(string && strlen(string)==1 && *string>='0' && *string<='7') { 2258 new_global_options.debug_level=*string-'0'; 2259 return 0; /* OK */ 2260 } 2261 new_global_options.debug_level=8; /* illegal level */ At (8): Condition "fl->name", taking true branch 2262 for(fl=levels; fl->name; ++fl) { CID 11183: Dereference after null check (FORWARD_NULL)At (9): Passing null pointer "string" to function "strcasecmp(char const *, char const *)", which dereferences it. 2263 if(!strcasecmp(fl->name, string)) { 2264 new_global_options.debug_level=fl->value; 2265 break; 2266 } 2267 } 2268 if(new_global_options.debug_level==8) 2269 return 1; /* FAILED */ 2270 return 0; /* OK */ 2271} Let me know if more info is required. Thanks

5 16

fix resource leaks and potential null dereferences in 4.54
by Arthur Mesh 03 Feb '13

03 Feb '13

Hi, I am trying to figure out where bug reports should be submitted. https://www.stunnel.org/lists.html references this mailing list, so here is my attempt at a bug report with a potential fix. If this is not an appropriate list, please redirect me. A coverity run has uncovered quite a few memory and other resource leaks, plus some potential NULL dereferences. Inline is an attempt to fix them. Imho, these are mostly self-explanatory, but if someone needs more details, I would be happy to provide those as well. Thanks diff -ru stunnel-4.54/src/options.c stunnel-4.54.p/src/options.c --- stunnel-4.54/src/options.c 2012-10-09 01:50:54.000000000 -0700 +++ stunnel-4.54.p/src/options.c 2013-01-29 16:26:00.000000000 -0800 @@ -1988,7 +1988,7 @@ int parse_conf(char *name, CONF_TYPE type) { DISK_FILE *df; - char line_text[CONFLINELEN], *errstr; + char line_text[CONFLINELEN], *errstr = NULL; char config_line[CONFLINELEN], *config_opt, *config_arg; int line_number, i; SERVICE_OPTIONS *section, *new_section; @@ -2104,7 +2104,8 @@ errstr=parse_service_option(CMD_END, section, NULL, NULL); } if(errstr) { - s_log(LOG_ERR, "Service [%s]: %s", section->servname, errstr); + s_log(LOG_ERR, "Service [%s]: %s", section ? section->servname : "", + errstr); return 1; } @@ -2253,7 +2254,7 @@ } new_global_options.debug_level=8; /* illegal level */ for(fl=levels; fl->name; ++fl) { - if(!strcasecmp(fl->name, string)) { + if(string && !strcasecmp(fl->name, string)) { new_global_options.debug_level=fl->value; break; } @@ -2428,6 +2429,7 @@ if(get_last_socket_error()!=S_ENOPROTOOPT) { s_log(LOG_ERR, "Failed to get %s OS default", ptr->opt_str); sockerror("getsockopt"); + close(fd); return 1; /* FAILED */ } td=str_dup("write-only"); @@ -2442,6 +2444,7 @@ ptr->opt_str, ta, tl, tr, td); str_free(ta); str_free(tl); str_free(tr); str_free(td); } + close(fd); return 0; /* OK */ } Only in stunnel-4.54.p/src: options.c.orig diff -ru stunnel-4.54/src/protocol.c stunnel-4.54.p/src/protocol.c --- stunnel-4.54/src/protocol.c 2012-10-09 01:46:47.000000000 -0700 +++ stunnel-4.54.p/src/protocol.c 2013-01-29 16:26:00.000000000 -0800 @@ -244,30 +244,36 @@ /**************************************** smtp */ static void smtp_client(CLI *c) { - char *line; + char *line = NULL; do { /* copy multiline greeting */ + str_free(line); /* okay to str_free(NULL) */ line=fd_getline(c, c->remote_fd.fd); fd_putline(c, c->local_wfd.fd, line); } while(isprefix(line, "220-")); fd_putline(c, c->remote_fd.fd, "EHLO localhost"); do { /* skip multiline reply */ + str_free(line); line=fd_getline(c, c->remote_fd.fd); } while(isprefix(line, "250-")); if(!isprefix(line, "250 ")) { /* error */ + str_free(line); s_log(LOG_ERR, "Remote server is not RFC 1425 compliant"); longjmp(c->err, 1); } fd_putline(c, c->remote_fd.fd, "STARTTLS"); do { /* skip multiline reply */ + str_free(line); line=fd_getline(c, c->remote_fd.fd); } while(isprefix(line, "220-")); if(!isprefix(line, "220 ")) { /* error */ + str_free(line); s_log(LOG_ERR, "Remote server is not RFC 2487 compliant"); longjmp(c->err, 1); } + str_free(line); } static void smtp_server(CLI *c) { @@ -290,21 +296,27 @@ line=fd_getline(c, c->remote_fd.fd); if(!isprefix(line, "220")) { s_log(LOG_ERR, "Unknown server welcome"); + str_free(line); longjmp(c->err, 1); } fd_printf(c, c->local_wfd.fd, "%s + stunnel", line); + str_free(line); line=fd_getline(c, c->local_rfd.fd); if(!isprefix(line, "EHLO ")) { s_log(LOG_ERR, "Unknown client EHLO"); + str_free(line); longjmp(c->err, 1); } fd_printf(c, c->local_wfd.fd, "250-%s Welcome", line); + str_free(line); fd_putline(c, c->local_wfd.fd, "250 STARTTLS"); line=fd_getline(c, c->local_rfd.fd); if(!isprefix(line, "STARTTLS")) { s_log(LOG_ERR, "STARTTLS expected"); + str_free(line); longjmp(c->err, 1); } + str_free(line); fd_putline(c, c->local_wfd.fd, "220 Go ahead"); } @@ -316,15 +328,19 @@ line=fd_getline(c, c->remote_fd.fd); if(!isprefix(line, "+OK ")) { s_log(LOG_ERR, "Unknown server welcome"); + str_free(line); longjmp(c->err, 1); } fd_putline(c, c->local_wfd.fd, line); + str_free(line); fd_putline(c, c->remote_fd.fd, "STLS"); line=fd_getline(c, c->remote_fd.fd); if(!isprefix(line, "+OK ")) { s_log(LOG_ERR, "Server does not support TLS"); + str_free(line); longjmp(c->err, 1); } + str_free(line); } static void pop3_server(CLI *c) { @@ -332,17 +348,21 @@ line=fd_getline(c, c->remote_fd.fd); fd_printf(c, c->local_wfd.fd, "%s + stunnel", line); + str_free(line); line=fd_getline(c, c->local_rfd.fd); if(isprefix(line, "CAPA")) { /* client wants RFC 2449 extensions */ fd_putline(c, c->local_wfd.fd, "+OK Stunnel capability list follows"); fd_putline(c, c->local_wfd.fd, "STLS"); fd_putline(c, c->local_wfd.fd, "."); + str_free(line); line=fd_getline(c, c->local_rfd.fd); } if(!isprefix(line, "STLS")) { + str_free(line); s_log(LOG_ERR, "Client does not want TLS"); longjmp(c->err, 1); } + str_free(line); fd_putline(c, c->local_wfd.fd, "+OK Stunnel starts TLS negotiation"); } @@ -353,18 +373,22 @@ line=fd_getline(c, c->remote_fd.fd); if(!isprefix(line, "* OK")) { + str_free(line); s_log(LOG_ERR, "Unknown server welcome"); longjmp(c->err, 1); } fd_putline(c, c->local_wfd.fd, line); + str_free(line); fd_putline(c, c->remote_fd.fd, "stunnel STARTTLS"); line=fd_getline(c, c->remote_fd.fd); if(!isprefix(line, "stunnel OK")) { + str_free(line); fd_putline(c, c->local_wfd.fd, "* BYE stunnel: Server does not support TLS"); s_log(LOG_ERR, "Server does not support TLS"); longjmp(c->err, 2); /* don't reset */ } + str_free(line); } static void imap_server(CLI *c) { @@ -387,6 +411,7 @@ /* process server welcome and send it to client */ line=fd_getline(c, c->remote_fd.fd); if(!isprefix(line, "* OK")) { + str_free(line); s_log(LOG_ERR, "Unknown server welcome"); longjmp(c->err, 1); } @@ -396,22 +421,29 @@ if(capa) *capa='K'; /* disable CAPABILITY within greeting */ fd_printf(c, c->local_wfd.fd, "%s (stunnel)", line); + str_free(line); while(1) { /* process client commands */ line=fd_getline(c, c->local_rfd.fd); /* split line into id and tail */ id=str_dup(line); tail=strchr(id, ' '); - if(!tail) + if(!tail) { + str_free(line); + str_free(id); break; + } *tail++='\0'; if(isprefix(tail, "STARTTLS")) { fd_printf(c, c->local_wfd.fd, "%s OK Begin TLS negotiation now", id); + str_free(line); + str_free(id); return; /* success */ } else if(isprefix(tail, "CAPABILITY")) { fd_putline(c, c->remote_fd.fd, line); /* send it to server */ + str_free(line); line=fd_getline(c, c->remote_fd.fd); /* get the capabilites */ if(*line=='*') { /* @@ -421,6 +453,7 @@ * LOGIN would fail as "unexpected command", anyway */ fd_printf(c, c->local_wfd.fd, "%s STARTTLS", line); + str_free(line); line=fd_getline(c, c->remote_fd.fd); /* next line */ } fd_putline(c, c->local_wfd.fd, line); /* forward to the client */ @@ -429,24 +462,35 @@ fd_putline(c, c->local_wfd.fd, "* BYE unexpected server response"); s_log(LOG_ERR, "Unexpected server response: %s", line); + str_free(line); + str_free(id); break; } + str_free(line); + str_free(id); } else if(isprefix(tail, "LOGOUT")) { fd_putline(c, c->local_wfd.fd, "* BYE server terminating"); fd_printf(c, c->local_wfd.fd, "%s OK LOGOUT completed", id); + str_free(id); + str_free(line); break; } else { fd_putline(c, c->local_wfd.fd, "* BYE stunnel: unexpected command"); fd_printf(c, c->local_wfd.fd, "%s BAD %s unexpected", id, tail); s_log(LOG_ERR, "Unexpected client command %s", tail); + str_free(line); + str_free(id); break; } } /* clean server shutdown */ fd_putline(c, c->remote_fd.fd, "stunnel LOGOUT"); line=fd_getline(c, c->remote_fd.fd); - if(*line=='*') + if(*line=='*') { + str_free(line); line=fd_getline(c, c->remote_fd.fd); + } + str_free(line); longjmp(c->err, 2); /* don't reset */ } @@ -458,15 +502,19 @@ line=fd_getline(c, c->remote_fd.fd); if(!isprefix(line, "200 ") && !isprefix(line, "201 ")) { s_log(LOG_ERR, "Unknown server welcome"); + str_free(line); longjmp(c->err, 1); } fd_putline(c, c->local_wfd.fd, line); fd_putline(c, c->remote_fd.fd, "STARTTLS"); + str_free(line); line=fd_getline(c, c->remote_fd.fd); if(!isprefix(line, "382 ")) { s_log(LOG_ERR, "Server does not support TLS"); + str_free(line); longjmp(c->err, 1); } + str_free(line); } /**************************************** connect */ @@ -548,13 +596,17 @@ /* not "HTTP/1.0 200 Connection established" */ s_log(LOG_ERR, "CONNECT request rejected"); do { /* read all headers */ + str_free(line); line=fd_getline(c, c->remote_fd.fd); } while(*line); + str_free(line); longjmp(c->err, 1); } + str_free(line); s_log(LOG_INFO, "CONNECT request accepted"); do { line=fd_getline(c, c->remote_fd.fd); /* read all headers */ + str_free(line); } while(*line); } @@ -588,10 +640,13 @@ if(line[9]!='4' || line[10]!='0' || line[11]!='7') { /* code 407 */ s_log(LOG_ERR, "NTLM authorization request rejected"); do { /* read all headers */ + str_free(line); line=fd_getline(c, c->remote_fd.fd); } while(*line); + str_free(line); longjmp(c->err, 1); } + str_free(line); ntlm2_txt=NULL; do { /* read all headers */ line=fd_getline(c, c->remote_fd.fd); @@ -599,6 +654,7 @@ ntlm2_txt=str_dup(line+25); else if(isprefix(line, "Content-Length: ")) content_length=atol(line+16); + str_free(line); } while(*line); if(!ntlm2_txt) { /* no Proxy-Authenticate: NTLM header */ s_log(LOG_ERR, "Proxy-Authenticate: NTLM header not found"); Only in stunnel-4.54.p/src: protocol.c.orig diff -ru stunnel-4.54/src/stunnel.c stunnel-4.54.p/src/stunnel.c --- stunnel-4.54/src/stunnel.c 2012-08-18 14:11:53.000000000 -0700 +++ stunnel-4.54.p/src/stunnel.c 2013-01-29 16:26:00.000000000 -0800 @@ -119,12 +119,16 @@ fatal("Could not open /dev/null"); #endif /* standard Unix */ main_initialize(); - if(main_configure(argc>1 ? argv[1] : NULL, argc>2 ? argv[2] : NULL)) + if(main_configure(argc>1 ? argv[1] : NULL, argc>2 ? argv[2] : NULL)) { + close(fd); return 1; + } if(service_options.next) { /* there are service sections -> daemon mode */ #if !defined(__vms) && !defined(USE_OS2) - if(daemonize(fd)) + if(daemonize(fd)) { + close(fd); return 1; + } close(fd); /* create_pid() must be called after drop_privileges() * or it won't be possible to remove the file on exit */ Only in stunnel-4.54.p/src: stunnel.c.orig

3 4

X509 certificate info extract and use
by Pierre-Yves Bonnetain 03 Feb '13

03 Feb '13

Hello, We're looking for a way to add some kind of cross-control between an application and the TLS tunnelling tool that protects the data. I'll give an example, that may be easier to understand. My BigDatabase has it's login/password authentication process. Since my customers want to access the database through bad Internet, we set up a SSL/TLS frontend. Each customer has his own X509 certificate, with all proper bells and jingles in it. The frontend checks the certificate (CA sig, validity, revocation, etc.) and then, as it should, passes the unencrypted flow to the application. There is no way (or, rather, we have not found any way) to cross-check that the certificate AND the requested, application-level login, are linked together. This means that my evil neighbour, which bribed my gullible cat to get my login and password, could connect to my account (app-level auth) using his X509 cert (TLS tunnel auth). We would like to perform this cross-check between X509 certificate AND application-level auth. >From our point of view, this means that we need to "extract and send" some parts of the certificate (DN, validity dates, etc.) to some secondary tool/proxy. This one will check if the data is coherent wrt application credentials. M. Henrik Riomar sent a patch (http://www.stunnel.org/pipermail/stunnel-users/2012-October/003909.html) on the list last october that is one step closer to what we are looking for. We could build from it. Maybe some of you have already solved this kind of problem, or know of a tool that answer to this kind of needs ? Tia, -- Pierre-Yves Bonnetain-Nesterenko B&A Consultants - Sécurité informatique - www.ba-consultants.fr Tel. : +33 (0) 563 277 241 - Fax : +33 (0) 567 737 829

2 5

inetd mode endpoint count check
by Michael Weiser 03 Feb '13

03 Feb '13

Hello, a client setup such as this: client = yes foreground = yes connect = example.com:80 exec = cat execargs = cat causes stunnel-4.54 to fail with error: Service [stunnel]: Inetd mode must define one endpoint The attached patch fixes the problem for me. Dunno if the endpoint check is too lax for other cases then, though. -- Thanks, Micha

2 1

transparent proxy ssl for a socket server
by Alex Needham 29 Jan '13

29 Jan '13

Hi I have to figure out how to get some ssl encapsulation for an application we have that only servs on obscure ports, the app needs to retain the source ip adress of the client requests. So i looked at stunnel, its working great in transparent mode where the stunnel server is the default gateway of the socket server, but I would like to get the stunnel server onto the same machine as the socket server and keep the client src ip. Testing with a apache as a backend as its easy to test. running centos 6.3 (2.6.32-279.19.1.el6.x86_64), updated an hour ago, built stunnel 4.54 from src.rpm. The players stunnel-boxen external=192.168.0.1, internal=192.168.1.1 web/socket-boxen internal=192.168.1.11, dg=192.168.1.1 The configs Config A - works ok debug = 7 foreground = yes #not chrooted runnnig as root no setuid,setguid [socket-1234] cert=blarg.crt key=blarg.key accept = 192.168.0.1:1234 connect = 192.168.1.11:80 transparent = source Config B - Not so good connect = 192.168.1.1:80 <- inside interface of stunnel box iptables -t mangle -N DIVERT iptables -t mangle -A PREROUTING -p tcp -m socket -j DIVERT iptables -t mangle -A DIVERT -j MARK --set-mark 1 iptables -t mangle -A DIVERT -j ACCEPT ip rule add fwmark 1 lookup 100 ip route add local 0.0.0.0/0 dev lo table 100 /etc/sysctl.conf no route filtering and forwarding is on am i trying something impossible? or am i missing something? Any help greatly appreciated, if I get this going I'll happily do a nice neater write up for others. Cheers Alex

2 1