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service_scan.cc
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/***************************************************************************
* service_scan.cc -- Routines used for service fingerprinting to determine *
* what application-level protocol is listening on a given port *
* (e.g. snmp, http, ftp, smtp, etc.) *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
* *
* The Nmap Security Scanner is (C) 1996-2006 Insecure.Com LLC. Nmap is *
* also a registered trademark of Insecure.Com LLC. This program is free *
* software; you may redistribute and/or modify it under the terms of the *
* GNU General Public License as published by the Free Software *
* Foundation; Version 2 with the clarifications and exceptions described *
* below. This guarantees your right to use, modify, and redistribute *
* this software under certain conditions. If you wish to embed Nmap *
* technology into proprietary software, we sell alternative licenses *
* (contact sales@insecure.com). Dozens of software vendors already *
* license Nmap technology such as host discovery, port scanning, OS *
* detection, and version detection. *
* *
* Note that the GPL places important restrictions on "derived works", yet *
* it does not provide a detailed definition of that term. To avoid *
* misunderstandings, we consider an application to constitute a *
* "derivative work" for the purpose of this license if it does any of the *
* following: *
* o Integrates source code from Nmap *
* o Reads or includes Nmap copyrighted data files, such as *
* nmap-os-fingerprints or nmap-service-probes. *
* o Executes Nmap and parses the results (as opposed to typical shell or *
* execution-menu apps, which simply display raw Nmap output and so are *
* not derivative works.) *
* o Integrates/includes/aggregates Nmap into a proprietary executable *
* installer, such as those produced by InstallShield. *
* o Links to a library or executes a program that does any of the above *
* *
* The term "Nmap" should be taken to also include any portions or derived *
* works of Nmap. This list is not exclusive, but is just meant to *
* clarify our interpretation of derived works with some common examples. *
* These restrictions only apply when you actually redistribute Nmap. For *
* example, nothing stops you from writing and selling a proprietary *
* front-end to Nmap. Just distribute it by itself, and point people to *
* http://insecure.org/nmap/ to download Nmap. *
* *
* We don't consider these to be added restrictions on top of the GPL, but *
* just a clarification of how we interpret "derived works" as it applies *
* to our GPL-licensed Nmap product. This is similar to the way Linus *
* Torvalds has announced his interpretation of how "derived works" *
* applies to Linux kernel modules. Our interpretation refers only to *
* Nmap - we don't speak for any other GPL products. *
* *
* If you have any questions about the GPL licensing restrictions on using *
* Nmap in non-GPL works, we would be happy to help. As mentioned above, *
* we also offer alternative license to integrate Nmap into proprietary *
* applications and appliances. These contracts have been sold to dozens *
* of software vendors, and generally include a perpetual license as well *
* as providing for priority support and updates as well as helping to *
* fund the continued development of Nmap technology. Please email *
* sales@insecure.com for further information. *
* *
* As a special exception to the GPL terms, Insecure.Com LLC grants *
* permission to link the code of this program with any version of the *
* OpenSSL library which is distributed under a license identical to that *
* listed in the included Copying.OpenSSL file, and distribute linked *
* combinations including the two. You must obey the GNU GPL in all *
* respects for all of the code used other than OpenSSL. If you modify *
* this file, you may extend this exception to your version of the file, *
* but you are not obligated to do so. *
* *
* If you received these files with a written license agreement or *
* contract stating terms other than the terms above, then that *
* alternative license agreement takes precedence over these comments. *
* *
* Source is provided to this software because we believe users have a *
* right to know exactly what a program is going to do before they run it. *
* This also allows you to audit the software for security holes (none *
* have been found so far). *
* *
* Source code also allows you to port Nmap to new platforms, fix bugs, *
* and add new features. You are highly encouraged to send your changes *
* to fyodor@insecure.org for possible incorporation into the main *
* distribution. By sending these changes to Fyodor or one the *
* Insecure.Org development mailing lists, it is assumed that you are *
* offering Fyodor and Insecure.Com LLC the unlimited, non-exclusive right *
* to reuse, modify, and relicense the code. Nmap will always be *
* available Open Source, but this is important because the inability to *
* relicense code has caused devastating problems for other Free Software *
* projects (such as KDE and NASM). We also occasionally relicense the *
* code to third parties as discussed above. If you wish to specify *
* special license conditions of your contributions, just say so when you *
* send them. *
* *
* This program is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details at *
* http://www.gnu.org/copyleft/gpl.html , or in the COPYING file included *
* with Nmap. *
* *
***************************************************************************/
/* $Id$ */
#include "service_scan.h"
#include "timing.h"
#include "NmapOps.h"
#include "nsock.h"
#include "nmap_tty.h"
#if HAVE_OPENSSL
#include <openssl/ssl.h>
#endif
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#include <algorithm>
#include <list>
/* Workaround for lack of namespace std on HP-UX 11.00 */
namespace std {};
using namespace std;
// Because this file uses assert()s for some security checking, we can't
// have anyone turning off debugging.
#undef NDEBUG
extern NmapOps o;
// Details on a particular service (open port) we are trying to match
class ServiceNFO {
public:
ServiceNFO(AllProbes *AP);
~ServiceNFO();
// If a service response to a given probeName, this function adds
// the response the the fingerprint for that service. The
// fingerprint can be printed when nothing matches the service. You
// can obtain the fingerprint (if any) via getServiceFingerprint();
void addToServiceFingerprint(const char *probeName, const u8 *resp,
int resplen);
// Get the service fingerprint. It is NULL if there is none, such
// as if there was a match before any other probes were finished (or
// if no probes gave back data). Note that this is plain
// NUL-terminated ASCII data, although the length is optionally
// available anyway. This function terminates the service fingerprint
// with a semi-colon
const char *getServiceFingerprint(int *flen);
// Note that the next 2 members are for convenience and are not destroyed w/the ServiceNFO
Target *target; // the port belongs to this target host
Port *port; // The Port that this service represents (this copy is taken from inside Target)
// if a match is found, it is placed here. Otherwise NULL
const char *probe_matched;
// If a match is found, any product/version/info/hostname/ostype/devicetype
// is placed in these 6 strings. Otherwise the string will be 0 length.
char product_matched[80];
char version_matched[80];
char extrainfo_matched[128];
char hostname_matched[128];
char ostype_matched[64];
char devicetype_matched[64];
enum service_tunnel_type tunnel; /* SERVICE_TUNNEL_NONE, SERVICE_TUNNEL_SSL */
// This stores our SSL session id, which will help speed up subsequent
// SSL connections. It's overwritten each time. void* is used so we don't
// need to #ifdef HAVE_OPENSSL all over. We'll cast later as needed.
void *ssl_session;
// if a match was found (see above), this tells whether it was a "soft"
// or hard match. It is always false if no match has been found.
bool softMatchFound;
// most recent probe executed (or in progress). If there has been a match
// (probe_matched != NULL), this will be the corresponding ServiceProbe.
ServiceProbe *currentProbe();
// computes the next probe to test, and ALSO CHANGES currentProbe() to
// that! If newresp is true, the old response info will be lost and
// invalidated. Otherwise it remains as if it had been received by
// the current probe (useful after a NULL probe).
ServiceProbe *nextProbe(bool newresp);
// Resets the probes back to the first one. One case where this is useful is
// when SSL is detected -- we redo all probes through SSL. If freeFP, any
// service fingerprint is freed too.
void resetProbes(bool freefp);
// Number of milliseconds left to complete the present probe, or 0 if
// the probe is already expired. Timeval can omitted, it is just there
// as an optimization in case you have it handy.
int currentprobe_timemsleft(const struct timeval *now = NULL);
enum serviceprobestate probe_state; // defined in portlist.h
nsock_iod niod; // The IO Descriptor being used in this probe (or NULL)
u16 portno; // in host byte order
u8 proto; // IPPROTO_TCP or IPPROTO_UDP
// The time that the current probe was executed (meaning TCP connection
// made or first UDP packet sent
struct timeval currentprobe_exec_time;
// Append newly-received data to the current response string (if any)
void appendtocurrentproberesponse(const u8 *respstr, int respstrlen);
// Get the full current response string. Note that this pointer is
// INVALIDATED if you call appendtocurrentproberesponse() or nextProbe()
u8 *getcurrentproberesponse(int *respstrlen);
AllProbes *AP;
private:
// Adds a character to servicefp. Takes care of word wrapping if
// necessary at the given (wrapat) column. Chars will only be
// written if there is enough space. Otherwise it exits.
void addServiceChar(char c, int wrapat);
// Like addServiceChar, but for a whole zero-terminated string
void addServiceString(char *s, int wrapat);
vector<ServiceProbe *>::iterator current_probe;
u8 *currentresp;
int currentresplen;
char *servicefp;
int servicefplen;
int servicefpalloc;
};
// This holds the service information for a group of Targets being service scanned.
class ServiceGroup {
public:
ServiceGroup(vector<Target *> &Targets, AllProbes *AP);
~ServiceGroup();
list<ServiceNFO *> services_finished; // Services finished (discovered or not)
list<ServiceNFO *> services_in_progress; // Services currently being probed
list<ServiceNFO *> services_remaining; // Probes not started yet
unsigned int ideal_parallelism; // Max (and desired) number of probes out at once.
ScanProgressMeter *SPM;
int num_hosts_timedout; // # of hosts timed out during (or before) scan
private:
};
#define SUBSTARGS_MAX_ARGS 5
#define SUBSTARGS_STRLEN 128
#define SUBSTARGS_ARGTYPE_NONE 0
#define SUBSTARGS_ARGTYPE_STRING 1
#define SUBSTARGS_ARGTYPE_INT 2
struct substargs {
int num_args; // Total number of arguments found
char str_args[SUBSTARGS_MAX_ARGS][SUBSTARGS_STRLEN];
// This is the length of each string arg, since they can contain zeros.
// The str_args[] are zero-terminated for convenience in the cases where
// you know they won't contain zero.
int str_args_len[SUBSTARGS_MAX_ARGS];
int int_args[SUBSTARGS_MAX_ARGS];
// The type of each argument -- see #define's above.
int arg_types[SUBSTARGS_MAX_ARGS];
};
/******************** PROTOTYPES *******************/
static void servicescan_read_handler(nsock_pool nsp, nsock_event nse, void *mydata);
static void servicescan_write_handler(nsock_pool nsp, nsock_event nse, void *mydata);
static void servicescan_connect_handler(nsock_pool nsp, nsock_event nse, void *mydata);
static void end_svcprobe(nsock_pool nsp, enum serviceprobestate probe_state, ServiceGroup *SG, ServiceNFO *svc, nsock_iod nsi);
ServiceProbeMatch::ServiceProbeMatch() {
deflineno = -1;
servicename = NULL;
matchstr = NULL;
product_template = version_template = info_template = NULL;
hostname_template = ostype_template = devicetype_template = NULL;
regex_compiled = NULL;
regex_extra = NULL;
isInitialized = false;
matchops_ignorecase = false;
matchops_dotall = false;
isSoft = false;
}
ServiceProbeMatch::~ServiceProbeMatch() {
if (!isInitialized) return;
if (servicename) free(servicename);
if (matchstr) free(matchstr);
if (product_template) free(product_template);
if (version_template) free(version_template);
if (info_template) free(info_template);
if (hostname_template) free(hostname_template);
if (ostype_template) free(ostype_template);
if (devicetype_template) free(devicetype_template);
matchstrlen = 0;
if (regex_compiled) pcre_free(regex_compiled);
if (regex_extra) pcre_free(regex_extra);
isInitialized = false;
matchops_anchor = -1;
}
// match text from the nmap-service-probes file. This must be called
// before you try and do anything with this match. This function
// should be passed the whole line starting with "match" or
// "softmatch" in nmap-service-probes. The line number that the text
// is provided so that it can be reported in error messages. This
// function will abort the program if there is a syntax problem.
void ServiceProbeMatch::InitMatch(const char *matchtext, int lineno) {
const char *p;
char *tmptemplate;
char delimchar, modechar;
int pcre_compile_ops = 0;
const char *pcre_errptr = NULL;
int pcre_erroffset = 0;
unsigned int tmpbuflen = 0;
char **curr_tmp = NULL;
if (isInitialized) fatal("Sorry ... ServiceProbeMatch::InitMatch does not yet support reinitializion");
if (!matchtext || !*matchtext)
fatal("ServiceProbeMatch::InitMatch: no matchtext passed in (line %d of nmap-service-probes)", lineno);
isInitialized = true;
deflineno = lineno;
while(isspace(*matchtext)) matchtext++;
// first we find whether this is a "soft" or normal match
if (strncmp(matchtext, "softmatch ", 10) == 0) {
isSoft = true;
matchtext += 10;
} else if (strncmp(matchtext, "match ", 6) == 0) {
isSoft = false;
matchtext += 6;
} else
fatal("ServiceProbeMatch::InitMatch: parse error on line %d of nmap-service-probes - must begin with \"match\" or \"softmatch\"", lineno);
// next comes the service name
p = strchr(matchtext, ' ');
if (!p) fatal("ServiceProbeMatch::InitMatch: parse error on line %d of nmap-service-probes: could not find service name", lineno);
servicename = (char *) safe_malloc(p - matchtext + 1);
memcpy(servicename, matchtext, p - matchtext);
servicename[p - matchtext] = '\0';
// The next part is a perl style regular expression specifier, like:
// m/^220 .*smtp/i Where 'm' means a normal regular expressions is
// used, the char after m can be anything (within reason, slash in
// this case) and tells us what delieates the end of the regex.
// After the delineating character are any single-character
// options. ('i' means "case insensitive", 's' means that . matches
// newlines (both are just as in perl)
matchtext = p;
while(isspace(*matchtext)) matchtext++;
if (*matchtext == 'm') {
if (!*(matchtext+1))
fatal("ServiceProbeMatch::InitMatch: parse error on line %d of nmap-service-probes: matchtext must begin with 'm'", lineno);
matchtype = SERVICEMATCH_REGEX;
delimchar = *(++matchtext);
++matchtext;
// find the end of the regex
p = strchr(matchtext, delimchar);
if (!p) fatal("ServiceProbeMatch::InitMatch: parse error on line %d of nmap-service-probes: could not find end delimiter for regex", lineno);
matchstrlen = p - matchtext;
matchstr = (char *) safe_malloc(matchstrlen + 1);
memcpy(matchstr, matchtext, matchstrlen);
matchstr[matchstrlen] = '\0';
matchtext = p + 1; // skip past the delim
// any options?
while(*matchtext && !isspace(*matchtext)) {
if (*matchtext == 'i')
matchops_ignorecase = true;
else if (*matchtext == 's')
matchops_dotall = true;
else fatal("ServiceProbeMatch::InitMatch: illegal regexp option on line %d of nmap-service-probes", lineno);
matchtext++;
}
// Next we compile and study the regular expression to match
if (matchops_ignorecase)
pcre_compile_ops |= PCRE_CASELESS;
if (matchops_dotall)
pcre_compile_ops |= PCRE_DOTALL;
regex_compiled = pcre_compile(matchstr, pcre_compile_ops, &pcre_errptr,
&pcre_erroffset, NULL);
if (regex_compiled == NULL)
fatal("ServiceProbeMatch::InitMatch: illegal regexp on line %d of nmap-service-probes (at regexp offset %d): %s\n", lineno, pcre_erroffset, pcre_errptr);
// Now study the regexp for greater efficiency
regex_extra = pcre_study(regex_compiled, 0, &pcre_errptr);
if (pcre_errptr != NULL)
fatal("ServiceProbeMatch::InitMatch: failed to pcre_study regexp on line %d of nmap-service-probes: %s\n", lineno, pcre_errptr);
} else {
/* Invalid matchtext */
fatal("ServiceProbeMatch::InitMatch: parse error on line %d of nmap-service-probes: match string must begin with 'm'", lineno);
}
/* OK! Now we look for any templates of the form ?/.../
* where ? is either p, v, i, h, o, or d. / is any
* delimiter character and ... is a template */
while(1) {
while(isspace(*matchtext)) matchtext++;
if (*matchtext == '\0' || *matchtext == '\r' || *matchtext == '\n') break;
modechar = *(matchtext++);
if (*matchtext == 0 || *matchtext == '\r' || *matchtext == '\n')
fatal("ServiceProbeMatch::InitMatch: parse error on line %d of nmap-service-probes", lineno);
delimchar = *(matchtext++);
p = strchr(matchtext, delimchar);
if (!p) fatal("ServiceProbeMatch::InitMatch: parse error on line %d of nmap-service-probes", lineno);
tmptemplate = NULL;
tmpbuflen = p - matchtext;
if (tmpbuflen > 0) {
tmptemplate = (char *) safe_malloc(tmpbuflen + 1);
memcpy(tmptemplate, matchtext, tmpbuflen);
tmptemplate[tmpbuflen] = '\0';
}
switch(modechar){
case 'p': curr_tmp = &product_template; break;
case 'v': curr_tmp = &version_template; break;
case 'i': curr_tmp = &info_template; break;
case 'h': curr_tmp = &hostname_template; break;
case 'o': curr_tmp = &ostype_template; break;
case 'd': curr_tmp = &devicetype_template; break;
default:
fatal("ServiceProbeMatch::InitMatch: Unknown template specifier '%c' on line %d of nmap-service-probes", modechar, lineno);
}
if(*curr_tmp){
if(o.debugging)
error("WARNING: Template \"%c/%s/\" replaced with \"%c/%s/\" on line %d of nmap-service-probes",
modechar,
*curr_tmp,
modechar,
tmptemplate,
lineno);
free(*curr_tmp);
}
*curr_tmp = tmptemplate;
matchtext = p + 1;
}
isInitialized = 1;
}
// If the buf (of length buflen) match the regex in this
// ServiceProbeMatch, returns the details of the match (service
// name, version number if applicable, and whether this is a "soft"
// match. If the buf doesn't match, the serviceName field in the
// structure will be NULL. The MatchDetails sructure returned is
// only valid until the next time this function is called. The only
// exception is that the serviceName field can be saved throughought
// program execution. If no version matched, that field will be
// NULL.
const struct MatchDetails *ServiceProbeMatch::testMatch(const u8 *buf, int buflen) {
int rc;
int i;
static char product[80];
static char version[80];
static char info[128];
static char hostname[80];
static char ostype[32];
static char devicetype[32];
char *bufc = (char *) buf;
int ovector[150]; // allows 50 substring matches (including the overall match)
assert(isInitialized);
assert (matchtype == SERVICEMATCH_REGEX);
// Clear out the output struct
memset(&MD_return, 0, sizeof(MD_return));
MD_return.isSoft = isSoft;
rc = pcre_exec(regex_compiled, regex_extra, bufc, buflen, 0, 0, ovector, sizeof(ovector) / sizeof(*ovector));
if (rc < 0) {
#ifdef PCRE_ERROR_MATCHLIMIT // earlier PCRE versions lack this
if (rc == PCRE_ERROR_MATCHLIMIT) {
if (o.debugging || o.verbose > 1)
error("Warning: Hit PCRE_ERROR_MATCHLIMIT when probing for service %s with the regex '%s'", servicename, matchstr);
} else
#endif // PCRE_ERROR_MATCHLIMIT
if (rc != PCRE_ERROR_NOMATCH) {
fatal("Unexpected PCRE error (%d) when probing for service %s with the regex '%s'", rc, servicename, matchstr);
}
} else {
// Yeah! Match apparently succeeded.
// Now lets get the version number if available
i = getVersionStr(buf, buflen, ovector, rc, product, sizeof(product), version, sizeof(version), info, sizeof(info),
hostname, sizeof(hostname), ostype, sizeof(ostype), devicetype, sizeof(devicetype));
if (*product) MD_return.product = product;
if (*version) MD_return.version = version;
if (*info) MD_return.info = info;
if (*hostname) MD_return.hostname = hostname;
if (*ostype) MD_return.ostype = ostype;
if (*devicetype) MD_return.devicetype = devicetype;
MD_return.serviceName = servicename;
}
return &MD_return;
}
// This simple function parses arguments out of a string. The string
// starts with the first argument. Each argument can be a string or
// an integer. Strings must be enclosed in double quotes (""). Most
// standard C-style escapes are supported. If this is successful, the
// number of args found is returned, args is filled appropriately, and
// args_end (if non-null) is set to the character after the closing
// ')'. Otherwise we return -1 and the values of args and args_end
// are undefined.
static int getsubstcommandargs(struct substargs *args, char *args_start,
char **args_end) {
char *p;
unsigned int len;
if (!args || !args_start) return -1;
memset(args, 0, sizeof(*args));
while(*args_start && *args_start != ')') {
// Find the next argument.
while(isspace(*args_start)) args_start++;
if (*args_start == ')')
break;
else if (*args_start == '"') {
// OK - it is a string
// Do we have space for another arg?
if (args->num_args == SUBSTARGS_MAX_ARGS)
return -1;
do {
args_start++;
if (*args_start == '"' && (*(args_start - 1) != '\\' || *(args_start - 2) == '\\'))
break;
len = args->str_args_len[args->num_args];
if (len >= SUBSTARGS_STRLEN - 1)
return -1;
args->str_args[args->num_args][len] = *args_start;
args->str_args_len[args->num_args]++;
} while(*args_start);
len = args->str_args_len[args->num_args];
args->str_args[args->num_args][len] = '\0';
// Now handle escaped characters and such
if (!cstring_unescape(args->str_args[args->num_args], &len))
return -1;
args->str_args_len[args->num_args] = len;
args->arg_types[args->num_args] = SUBSTARGS_ARGTYPE_STRING;
args->num_args++;
args_start++;
args_start = strpbrk(args_start, ",)");
if (!args_start) return -1;
if (*args_start == ',') args_start++;
} else {
// Must be an integer argument
args->int_args[args->num_args] = (int) strtol(args_start, &p, 0);
if (p <= args_start) return -1;
args_start = p;
args->arg_types[args->num_args] = SUBSTARGS_ARGTYPE_INT;
args->num_args++;
args_start = strpbrk(args_start, ",)");
if (!args_start) return -1;
if (*args_start == ',') args_start++;
}
}
if (*args_start == ')') args_start++;
if (args_end) *args_end = args_start;
return args->num_args;
}
// This function does the actual substitution of a placeholder like $2
// or $U(4) into the given buffer. It returns the number of chars
// written, or -1 if it fails. tmplvar is a template variable, such
// as "$U(2)". We determine the appropriate string representing that,
// and place it in newstr (as long as it doesn't exceed newstrlen).
// We then set *tmplvarend to the character after the
// variable. subject, subjectlen, ovector, and nummatches mean the
// same as in dotmplsubst().
static int substvar(char *tmplvar, char **tmplvarend, char *newstr,
int newstrlen, const u8 *subject, int subjectlen, int *ovector,
int nummatches) {
char substcommand[16];
char *p = NULL;
char *p_end;
int len;
int subnum = 0;
int offstart, offend;
int byteswritten = 0; // for return val
int rc;
int i;
struct substargs command_args;
// skip the '$'
if (*tmplvar != '$') return -1;
tmplvar++;
if (!isdigit(*tmplvar)) {
p = strchr(tmplvar, '(');
if (!p) return -1;
len = p - tmplvar;
if (!len || len >= (int) sizeof(substcommand))
return -1;
memcpy(substcommand, tmplvar, len);
substcommand[len] = '\0';
tmplvar = p+1;
// Now we grab the arguments.
rc = getsubstcommandargs(&command_args, tmplvar, &p_end);
if (rc <= 0) return -1;
tmplvar = p_end;
} else {
substcommand[0] = '\0';
subnum = *tmplvar - '0';
tmplvar++;
}
if (tmplvarend) *tmplvarend = tmplvar;
if (!*substcommand) {
if (subnum > 9 || subnum <= 0) return -1;
if (subnum >= nummatches) return -1;
offstart = ovector[subnum * 2];
offend = ovector[subnum * 2 + 1];
assert(offstart >= 0 && offstart < subjectlen);
assert(offend >= 0 && offend <= subjectlen);
len = offend - offstart;
// A plain-jane copy
if (newstrlen <= len - 1)
return -1;
memcpy(newstr, subject + offstart, len);
byteswritten = len;
} else if (strcmp(substcommand, "P") == 0) {
if (command_args.arg_types[0] != SUBSTARGS_ARGTYPE_INT)
return -1;
subnum = command_args.int_args[0];
if (subnum > 9 || subnum <= 0) return -1;
if (subnum >= nummatches) return -1;
offstart = ovector[subnum * 2];
offend = ovector[subnum * 2 + 1];
assert(offstart >= 0 && offstart < subjectlen);
assert(offend >= 0 && offend <= subjectlen);
// This filter only includes printable characters. It is particularly
// useful for collapsing unicode text that looks like
// "W\0O\0R\0K\0G\0R\0O\0U\0P\0"
for(i=offstart; i < offend; i++)
if (isprint((int) subject[i])) {
if (byteswritten >= newstrlen - 1)
return -1;
newstr[byteswritten++] = subject[i];
}
} else if (strcmp(substcommand, "SUBST") == 0) {
char *findstr, *replstr;
int findstrlen, replstrlen;
if (command_args.arg_types[0] != SUBSTARGS_ARGTYPE_INT)
return -1;
subnum = command_args.int_args[0];
if (subnum > 9 || subnum <= 0) return -1;
if (subnum >= nummatches) return -1;
offstart = ovector[subnum * 2];
offend = ovector[subnum * 2 + 1];
assert(offstart >= 0 && offstart < subjectlen);
assert(offend >= 0 && offend <= subjectlen);
if (command_args.arg_types[1] != SUBSTARGS_ARGTYPE_STRING ||
command_args.arg_types[2] != SUBSTARGS_ARGTYPE_STRING)
return -1;
findstr = command_args.str_args[1];
findstrlen = command_args.str_args_len[1];
replstr = command_args.str_args[2];
replstrlen = command_args.str_args_len[2];
for(i=offstart; i < offend; ) {
if (byteswritten >= newstrlen - 1)
return -1;
if (offend - i < findstrlen)
newstr[byteswritten++] = subject[i++]; // No room for match
else if (memcmp(subject + i, findstr, findstrlen) != 0)
newstr[byteswritten++] = subject[i++]; // no match
else {
// The find string was found, copy it to newstring
if (newstrlen - 1 - byteswritten < replstrlen)
return -1;
memcpy(newstr + byteswritten, replstr, replstrlen);
byteswritten += replstrlen;
i += findstrlen;
}
}
} else return -1; // Unknown command
if (byteswritten >= newstrlen) return -1;
newstr[byteswritten] = '\0';
return byteswritten;
}
// This function takes a template string (tmpl) which can have
// placeholders in it such as $1 for substring matches in a regexp
// that was run against subject, and subjectlen, with the 'nummatches'
// matches in ovector. The NUL-terminated newly composted string is
// placed into 'newstr', as long as it doesn't exceed 'newstrlen'
// bytes. Trailing whitespace and commas are removed. Returns zero for success
static int dotmplsubst(const u8 *subject, int subjectlen,
int *ovector, int nummatches, char *tmpl, char *newstr,
int newstrlen) {
int newlen;
char *srcstart=tmpl, *srcend;
char *dst = newstr;
char *newstrend = newstr + newstrlen; // Right after the final char
if (!newstr || !tmpl) return -1;
if (newstrlen < 3) return -1; // fuck this!
while(*srcstart) {
// First do any literal text before '$'
srcend = strchr(srcstart, '$');
if (!srcend) {
// Only literal text remain!
while(*srcstart) {
if (dst >= newstrend - 1)
return -1;
*dst++ = *srcstart++;
}
*dst = '\0';
while (--dst >= newstr) {
if (isspace(*dst) || *dst == ',')
*dst = '\0';
else break;
}
return 0;
} else {
// Copy the literal text up to the '$', then do the substitution
newlen = srcend - srcstart;
if (newlen > 0) {
if (newstrend - dst <= newlen - 1)
return -1;
memcpy(dst, srcstart, newlen);
dst += newlen;
}
srcstart = srcend;
newlen = substvar(srcstart, &srcend, dst, newstrend - dst, subject,
subjectlen, ovector, nummatches);
if (newlen == -1) return -1;
dst += newlen;
srcstart = srcend;
}
}
if (dst >= newstrend - 1)
return -1;
*dst = '\0';
while (--dst >= newstr) {
if (isspace(*dst) || *dst == ',')
*dst = '\0';
else break;
}
return 0;
}
// Use the six version templates and the match data included here
// to put the version info into the given strings, (as long as the sizes
// are sufficient). Returns zero for success. If no template is available
// for a string, that string will have zero length after the function
// call (assuming the corresponding length passed in is at least 1)
int ServiceProbeMatch::getVersionStr(const u8 *subject, int subjectlen,
int *ovector, int nummatches, char *product, int productlen,
char *version, int versionlen, char *info, int infolen,
char *hostname, int hostnamelen, char *ostype, int ostypelen,
char *devicetype, int devicetypelen) {
int rc;
assert(productlen >= 0 && versionlen >= 0 && infolen >= 0 &&
hostnamelen >= 0 && ostypelen >= 0 && devicetypelen >= 0);
if (productlen > 0) *product = '\0';
if (versionlen > 0) *version = '\0';
if (infolen > 0) *info = '\0';
if (hostnamelen > 0) *hostname = '\0';
if (ostypelen > 0) *ostype = '\0';
if (devicetypelen > 0) *devicetype = '\0';
int retval = 0;
// Now lets get this started! We begin with the product name
if (product_template) {
rc = dotmplsubst(subject, subjectlen, ovector, nummatches, product_template, product, productlen);
if (rc != 0) {
error("Warning: Servicescan failed to fill product_template (subjectlen: %d). Too long? Match string was line %d: v/%s/%s/%s", subjectlen, deflineno, (product_template)? product_template : "",
(version_template)? version_template : "", (info_template)? info_template : "");
if (productlen > 0) *product = '\0';
retval = -1;
}
}
if (version_template) {
rc = dotmplsubst(subject, subjectlen, ovector, nummatches, version_template, version, versionlen);
if (rc != 0) {
error("Warning: Servicescan failed to fill version_template (subjectlen: %d). Too long? Match string was line %d: v/%s/%s/%s", subjectlen, deflineno, (product_template)? product_template : "",
(version_template)? version_template : "", (info_template)? info_template : "");
if (versionlen > 0) *version = '\0';
retval = -1;
}
}
if (info_template) {
rc = dotmplsubst(subject, subjectlen, ovector, nummatches, info_template, info, infolen);
if (rc != 0) {
error("Warning: Servicescan failed to fill info_template (subjectlen: %d). Too long? Match string was line %d: v/%s/%s/%s", subjectlen, deflineno, (product_template)? product_template : "",
(version_template)? version_template : "", (info_template)? info_template : "");
if (infolen > 0) *info = '\0';
retval = -1;
}
}
if (hostname_template) {
rc = dotmplsubst(subject, subjectlen, ovector, nummatches, hostname_template, hostname, hostnamelen);
if (rc != 0) {
error("Warning: Servicescan failed to fill hostname_template (subjectlen: %d). Too long? Match string was line %d: h/%s/", subjectlen, deflineno, (hostname_template)? hostname_template : "");
if (hostnamelen > 0) *hostname = '\0';
retval = -1;
}
}
if (ostype_template) {
rc = dotmplsubst(subject, subjectlen, ovector, nummatches, ostype_template, ostype, ostypelen);
if (rc != 0) {
error("Warning: Servicescan failed to fill ostype_template (subjectlen: %d). Too long? Match string was line %d: p/%s/", subjectlen, deflineno, (ostype_template)? ostype_template : "");
if (ostypelen > 0) *ostype = '\0';
retval = -1;
}
}
if (devicetype_template) {
rc = dotmplsubst(subject, subjectlen, ovector, nummatches, devicetype_template, devicetype, devicetypelen);
if (rc != 0) {
error("Warning: Servicescan failed to fill devicetype_template (subjectlen: %d). Too long? Match string was line %d: d/%s/", subjectlen, deflineno, (devicetype_template)? devicetype_template : "");
if (devicetypelen > 0) *devicetype = '\0';
retval = -1;
}
}
return retval;
}
ServiceProbe::ServiceProbe() {
int i;
probename = NULL;
probestring = NULL;
totalwaitms = DEFAULT_SERVICEWAITMS;
probestringlen = 0; probeprotocol = -1;
// The default rarity level for a probe without a rarity
// directive - should almost never have to be relied upon.
rarity = 5;
fallbackStr = NULL;
for (i=0; i<MAXFALLBACKS+1; i++) fallbacks[i] = NULL;
}
ServiceProbe::~ServiceProbe() {
vector<ServiceProbeMatch *>::iterator vi;
if (probename) free(probename);
if (probestring) free(probestring);
for(vi = matches.begin(); vi != matches.end(); vi++) {
delete *vi;
}
if (fallbackStr) free(fallbackStr);
}
// Parses the "probe " line in the nmap-service-probes file. Pass the rest of the line
// after "probe ". The format better be:
// [TCP|UDP] [probename] q|probetext|
// Note that the delimiter (|) of the probetext can be anything (within reason)
// the lineno is requested because this function will bail with an error
// (giving the line number) if it fails to parse the string.
void ServiceProbe::setProbeDetails(char *pd, int lineno) {
char *p;
unsigned int len;
char delimiter;
if (!pd || !*pd)
fatal("Parse error on line %d of nmap-service-probes: no arguments found!", lineno);
// First the protocol
if (strncmp(pd, "TCP ", 4) == 0)
probeprotocol = IPPROTO_TCP;
else if (strncmp(pd, "UDP ", 4) == 0)
probeprotocol = IPPROTO_UDP;
else fatal("Parse error on line %d of nmap-service-probes: invalid protocol", lineno);
pd += 4;
// Next the service name
if (!isalnum(*pd)) fatal("Parse error on line %d of nmap-service-probes - bad probe name", lineno);
p = strchr(pd, ' ');
if (!p) fatal("Parse error on line %d of nmap-service-probes - nothing after probe name", lineno);
len = p - pd;
probename = (char *) safe_malloc(len + 1);
memcpy(probename, pd, len);
probename[len] = '\0';
// Now for the probe itself
pd = p+1;
if (*pd != 'q') fatal("Parse error on line %d of nmap-service-probes - probe string must begin with 'q'", lineno);
delimiter = *(++pd);
p = strchr(++pd, delimiter);
if (!p) fatal("Parse error on line %d of nmap-service-probes -- no ending delimiter for probe string", lineno);
*p = '\0';
if (!cstring_unescape(pd, &len)) {
fatal("Parse error on line %d of nmap-service-probes: bad probe string escaping", lineno);
}
setProbeString((const u8 *)pd, len);
}
void ServiceProbe::setProbeString(const u8 *ps, int stringlen) {
if (probestringlen) free(probestring);
probestringlen = stringlen;
if (stringlen > 0) {
probestring = (u8 *) safe_malloc(stringlen + 1);
memcpy(probestring, ps, stringlen);
probestring[stringlen] = '\0'; // but note that other \0 may be in string
} else probestring = NULL;
}
void ServiceProbe::setPortVector(vector<u16> *portv, const char *portstr,
int lineno) {
const char *current_range;
char *endptr;
long int rangestart = 0, rangeend = 0;
current_range = portstr;
do {
while(*current_range && isspace(*current_range)) current_range++;
if (isdigit((int) *current_range)) {
rangestart = strtol(current_range, &endptr, 10);
if (rangestart < 0 || rangestart > 65535) {
fatal("Parse error on line %d of nmap-service-probes: Ports must be between 0 and 65535 inclusive", lineno);
}
current_range = endptr;
while(isspace((int) *current_range)) current_range++;
} else {
fatal("Parse error on line %d of nmap-service-probes: An example of proper portlist form is \"21-25,53,80\"", lineno);
}
/* Now I have a rangestart, time to go after rangeend */
if (!*current_range || *current_range == ',') {
/* Single port specification */
rangeend = rangestart;
} else if (*current_range == '-') {
current_range++;
if (isdigit((int) *current_range)) {
rangeend = strtol(current_range, &endptr, 10);
if (rangeend < 0 || rangeend > 65535 || rangeend < rangestart) {
fatal("Parse error on line %d of nmap-service-probes: Ports must be between 0 and 65535 inclusive", lineno);
}
current_range = endptr;
} else {
fatal("Parse error on line %d of nmap-service-probes: An example of proper portlist form is \"21-25,53,80\"", lineno);
}
} else {
fatal("Parse error on line %d of nmap-service-probes: An example of proper portlist form is \"21-25,53,80\"", lineno);
}
/* Now I have a rangestart and a rangeend, so I can add these ports */
while(rangestart <= rangeend) {
portv->push_back(rangestart);
rangestart++;
}
/* Find the next range */
while(isspace((int) *current_range)) current_range++;
if (*current_range && *current_range != ',') {
fatal("Parse error on line %d of nmap-service-probes: An example of proper portlist form is \"21-25,53,80\"", lineno);
}
if (*current_range == ',')
current_range++;
} while(current_range && *current_range);
}
// Takes a string as given in the 'ports '/'sslports ' line of
// nmap-service-probes. Pass in the list from the appropriate
// line. For 'sslports', tunnel should be specified as
// SERVICE_TUNNEL_SSL. Otherwise use SERVICE_TUNNEL_NONE. The line
// number is requested because this function will bail with an error
// (giving the line number) if it fails to parse the string. Ports
// are a comma separated list of ports and ranges
// (e.g. 53,80,6000-6010).
void ServiceProbe::setProbablePorts(enum service_tunnel_type tunnel,
const char *portstr, int lineno) {
if (tunnel == SERVICE_TUNNEL_NONE)
setPortVector(&probableports, portstr, lineno);
else {
assert(tunnel == SERVICE_TUNNEL_SSL);
setPortVector(&probablesslports, portstr, lineno);
}
}
/* Returns true if the passed in port is on the list of probable
ports for this probe and tunnel type. Use a tunnel of
SERVICE_TUNNEL_SSL or SERVICE_TUNNEL_NONE as appropriate */