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339
COPYING Normal file
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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
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How to Apply These Terms to Your New Programs
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Gnomovision version 69, Copyright (C) year name of author
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The hypothetical commands `show w' and `show c' should show the appropriate
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Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
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consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License.

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CC = gcc
CFLAGS = -O2 -s -D_GNU_SOURCE
LDLIBS = -lcrypt
PREFIX =
BINDIR = $(PREFIX)/usr/sbin
all: sessmgr
@echo "All done!"
sessmgr: sessmgr.o sha256.o
$(CC) $(CFLAGS) $(LDLIBS) sessmgr.o sha256.o -o sessmgr
sessmgr.o: sessmgr.c
$(CC) $(CFLAGS) -c sessmgr.c
sha256.o: sha256.c
$(CC) $(CFLAGS) -c sha256.c
install:
mkdir -p $(BINDIR)
cp sessmgr $(BINDIR)
@echo "All done!"
uninstall:
rm -f $(BINDIR)/sessmgr
@echo "All done!"
clean:
rm -f sessmgr *.o
@echo "All done!"

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Session Manager
===============
SessMgr is a small utility for Kagera Firmware Administrator's WebUI session validation.
Its task is to check password, validate sessions and authorize administrator access.
For security reasons, it also saves all success authorization in system logger and allows
to easily log out from Web Interface.
It is based on Gargoyle Session Validator <http://www.gargoyle-router.com/>

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sessmgr
=======
Kagera Session Manager

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/**
* @PROJECT Session Manager
* @COPYRIGHT See COPYING in the top level directory
* @FILE sessmgr.h
* @PURPOSE WebUI session manager
* @DEVELOPERS Eric Bishop <eric@gargoyle-router.com>
* Rafal Kupiec <belliash@asiotec.eu.org>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include <stdarg.h>
#include <time.h>
#include "sessmgr.h"
#include "sha256.h"
char* get_cookie_time(time_t t) {
struct tm* utc = gmtime(&t);
char wday[4];
char month[4];
switch(utc->tm_wday) {
case 0:
sprintf(wday, "Sun");
break;
case 1:
sprintf(wday, "Mon");
break;
case 2:
sprintf(wday, "Tue");
break;
case 3:
sprintf(wday, "Wed");
break;
case 4:
sprintf(wday, "Thu");
break;
case 5:
sprintf(wday, "Fri");
break;
case 6:
sprintf(wday, "Sat");
break;
}
switch(utc->tm_mon) {
case 0:
sprintf(month, "Jan");
break;
case 1:
sprintf(month, "Feb");
break;
case 2:
sprintf(month, "Mar");
break;
case 3:
sprintf(month, "Apr");
break;
case 4:
sprintf(month, "May");
break;
case 5:
sprintf(month, "Jun");
break;
case 6:
sprintf(month, "Jul");
break;
case 7:
sprintf(month, "Aug");
break;
case 8:
sprintf(month, "Sep");
break;
case 9:
sprintf(month, "Oct");
break;
case 10:
sprintf(month, "Nov");
break;
case 11:
sprintf(month, "Dec");
break;
}
char utc_str[200];
sprintf(utc_str, "%s, %d %s %d %02d:%02d:%02d UTC", wday, utc->tm_mday, month, (utc->tm_year + 1900), utc->tm_hour, utc->tm_min, utc->tm_sec);
return safe_strdup(utc_str);
}
char* get_root_hash(void) {
char* root_hash = get_root_hash_from_file("/etc/shadow");
if(root_hash == NULL) {
root_hash = get_root_hash_from_file("/etc/passwd");
}
return root_hash;
}
char* get_root_hash_from_file(const char* passwd_file) {
int found = 0;
FILE *pw = fopen(passwd_file, "r");
char* root_hash = NULL;
if(pw != NULL) {
char line[512];
char* test = fgets(line, 511, pw);
while(test != NULL && !found) {
if(strlen(test) > 5) {
test[4] = '\0';
if(strcmp(test, "root") == 0) {
char* hash_end;
found = 1;
test = test + 5;
hash_end = strchr(test, ':');
*hash_end = '\0';
root_hash = safe_strdup(test);
}
}
test = fgets(line, 511, pw);
}
fclose(pw);
}
return root_hash;
}
int main(int argc, char **argv) {
char *password = NULL;
char *cookie_hash = NULL;
char *cookie_exp = NULL;
char *user_agent = NULL;
char *src_ip = NULL;
char *redirect = NULL;
int timeout_minutes = DEFAULT_SESSION_TIMEOUT;
unsigned long browser_time = 0;
int loggedout = 0;
int unconditionally_generate = 0;
int next_opt;
int read;
while((next_opt = getopt(argc, argv, "p:P:c:C:e:E:a:A:i:I:r:R:t:T:b:B:lL:gG")) != -1) {
switch(next_opt) {
case 'p':
case 'P':
password = safe_strdup(optarg);
break;
case 'c':
case 'C':
cookie_hash = safe_strdup(optarg);
break;
case 'e':
case 'E':
cookie_exp = safe_strdup(optarg);
break;
case 'a':
case 'A':
user_agent = safe_strdup(optarg);
break;
case 'i':
case 'I':
src_ip = safe_strdup(optarg);
break;
case 'r':
case 'R':
redirect = safe_strdup(optarg);
break;
case 't':
case 'T':
read = sscanf(optarg, "%d", &timeout_minutes);
if(read > 0) {
timeout_minutes = timeout_minutes > 0 ? timeout_minutes : DEFAULT_SESSION_TIMEOUT;
} else {
timeout_minutes = DEFAULT_SESSION_TIMEOUT;
}
timeout_minutes *= 60;
break;
case 'b':
case 'B':
read = sscanf(optarg, "%ld", &browser_time);
browser_time = read > 0 ? browser_time : 0;
break;
case 'l':
case 'L':
loggedout = 1;
break;
case 'g':
case 'G':
unconditionally_generate = 1;
break;
}
}
int expired = 0;
int valid = 0;
char* root_hash = get_root_hash();
if(loggedout == 1) {
printf("echo \"Set-Cookie:kagera_sid=loggedout;\"; ");
} else if(root_hash != NULL) {
time_t now;
time(&now);
if(password != NULL) {
valid = strcmp(crypt(password, root_hash), root_hash) == 0 ? 1 : 0;
if(valid) {
printf("logger -t webui \"Kagera Administration Interface authorization succeeded from ${REMOTE_ADDR}\"; ");
}
} else if(cookie_hash != NULL && cookie_exp != NULL && user_agent != NULL && src_ip != NULL) {
time_t exp_time;
int read = sscanf(cookie_exp, "%ld", &exp_time);
if(read > 0) {
expired = 1;
if(exp_time > now && (exp_time - (timeout_minutes) - 2) <= now) {
expired = 0;
}
}
char *combined = safe_strcat(4, root_hash, cookie_exp, user_agent, src_ip);
char* hashed = get_sha256_hash_hex_str(combined);
if(strcmp(hashed, cookie_hash) == 0) {
if(expired == 0 && read > 0) {
valid = 1;
}
} else {
expired = 0;
}
free(hashed);
free(combined);
}
if(unconditionally_generate == 1) {
valid = 1;
}
if(valid == 1 && src_ip != NULL && user_agent != NULL) {
char* new_hash;
char* combined;
char new_exp[100] = "";
time_t new_exp_t = now + (timeout_minutes);
sprintf(new_exp, "%ld", new_exp_t);
char* cookie_exp;
if(browser_time > 0 && ((browser_time - now) < (-5*60) || (browser_time - now) > (5*60))) {
time_t cookie_exp_t = browser_time+(timeout_minutes);
cookie_exp = get_cookie_time(cookie_exp_t);
} else {
cookie_exp = get_cookie_time(new_exp_t);
}
combined = safe_strcat(4, root_hash, new_exp, user_agent, src_ip);
new_hash = get_sha256_hash_hex_str(combined);
if(browser_time == 0) {
printf("echo \"Set-Cookie:kagera_sid=%s; Path=/;\"; echo \"Set-Cookie:kagera_exp=%s; Path=/;\"; ", new_hash, new_exp);
} else {
printf("echo \"Set-Cookie:kagera_sid=%s; Expires=%s; Path=/;\"; echo \"Set-Cookie:kagera_exp=%s; Expires=%s; Path=/;\"; ", new_hash, cookie_exp, new_exp, cookie_exp);
}
free(new_hash);
free(combined);
free(cookie_exp);
} else {
printf("KAGERA_LOGGEDOUT=1\n");
}
free(root_hash);
}
if(redirect != NULL) {
char str[20] = "";
if(expired == 1) {
sprintf(str, "&expired=1");
} else if(loggedout == 1) {
sprintf(str, "&loggedout=1");
}
printf("echo \"HTTP/1.1 301 Moved Permanently;\"; echo \"Location: %s%s\"; exit", redirect, str);
}
return 0;
}
void* safe_malloc(size_t size) {
void* val = malloc(size);
if(val == NULL) {
fprintf(stderr, "ERROR: MALLOC FAILURE!\n");
exit(1);
}
return val;
}
char* safe_strcat(int num_strs, ...) {
va_list strs;
int new_length = 0;
int i;
int next_start;
char* new_str;
va_start(strs, num_strs);
for(i=0; i < num_strs; i++) {
char* next_arg = va_arg(strs, char*);
if(next_arg != NULL) {
new_length = new_length + strlen(next_arg);
}
}
va_end(strs);
new_str = safe_malloc((1 + new_length) * sizeof(char));
va_start(strs, num_strs);
next_start = 0;
for(i=0; i < num_strs; i++) {
char* next_arg = va_arg(strs, char*);
if(next_arg != NULL) {
int next_length = strlen(next_arg);
memcpy(new_str+next_start,next_arg, next_length);
next_start = next_start+next_length;
}
}
new_str[next_start] = '\0';
return new_str;
}
char* safe_strdup(const char* str) {
char* new_str = NULL;
if(str != NULL) {
new_str = strdup(str);
if(new_str == NULL) {
fprintf(stderr, "ERROR: MALLOC FAILURE!\n");
exit(1);
}
}
return new_str;
}

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/**
* @PROJECT Session Manager
* @COPYRIGHT See COPYING in the top level directory
* @FILE sessmgr.h
* @PURPOSE WebUI session manager
* @DEVELOPERS Eric Bishop <eric@gargoyle-router.com>
* Rafal Kupiec <belliash@asiotec.eu.org>
*/
#ifndef __SESSMGR_H
#define __SESSMGR_H
#define DEFAULT_SESSION_TIMEOUT 15
extern char* crypt(const char* key, const char* setting);
char* get_cookie_time(time_t t);
char* get_root_hash(void);
char* get_root_hash_from_file(const char* passwd_file);
void* safe_malloc(size_t size);
char* safe_strcat(int num_strs, ...);
char* safe_strdup(const char* str);
#endif

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/*
* sha256.c - Implementation of the Secure Hash Algorithm-256 (SHA-256).
*
* Implemented from the description on the NIST Web site:
* http://csrc.nist.gov/cryptval/shs.html
*
*
* Copyright (C) 2012 Rafal Kupiec (customized for sessmgr)
* Copyright (C) 2009 Eric Bishop (adapted as standalone utility)
* Copyright (C) 2002 Southern Storm Software, Pty Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include "sha256.h"
static void ProcessBlock(SHA256Context *sha, const unsigned char *block) {
u_int32_t W[64];
u_int32_t a, b, c, d, e, f, g, h;
u_int32_t temp, temp2;
int t;
for(t = 0; t < 16; ++t) {
W[t] = (((u_int32_t) (block[t * 4 + 0])) << 24) | (((u_int32_t) (block[t * 4 + 1])) << 16) | (((u_int32_t) (block[t * 4 + 2])) << 8) | ((u_int32_t) (block[t * 4 + 3]));
}
for(t = 16; t < 64; ++t) {
W[t] = TRUNCLONG(RHO1(W[t - 2]) + W[t - 7] + RHO0(W[t - 15]) + W[t - 16]);
}
a = sha->A;
b = sha->B;
c = sha->C;
d = sha->D;
e = sha->E;
f = sha->F;
g = sha->G;
h = sha->H;
for(t = 0; t < 64; ++t) {
temp = TRUNCLONG(h + SUM1(e) + CH(e, f, g) + K[t] + W[t]);
temp2 = TRUNCLONG(SUM0(a) + MAJ(a, b, c));
h = g;
g = f;
f = e;
e = TRUNCLONG(d + temp);
d = c;
c = b;
b = a;
a = TRUNCLONG(temp + temp2);
}
sha->A = TRUNCLONG(sha->A + a);
sha->B = TRUNCLONG(sha->B + b);
sha->C = TRUNCLONG(sha->C + c);
sha->D = TRUNCLONG(sha->D + d);
sha->E = TRUNCLONG(sha->E + e);
sha->F = TRUNCLONG(sha->F + f);
sha->G = TRUNCLONG(sha->G + g);
sha->H = TRUNCLONG(sha->H + h);
DoMemZero(W, sizeof(u_int32_t) * 64);
a = b = c = d = e = f = g = h = temp = temp2 = 0;
}
void SHA256Data(SHA256Context *sha, const void *buffer, unsigned long len) {
unsigned long templen;
sha->totalLen += (u_int64_t)len;
while(len > 0) {
if(!(sha->inputLen) && len >= 64) {
ProcessBlock(sha, (const unsigned char *) buffer);
buffer = (const void *) (((const unsigned char *) buffer) + 64);
len -= 64;
} else {
templen = len;
if(templen > (64 - sha->inputLen)) {
templen = 64 - sha->inputLen;
}
memcpy(sha->input + sha->inputLen, buffer, templen);
if((sha->inputLen += templen) >= 64) {
ProcessBlock(sha, sha->input);
sha->inputLen = 0;
}
buffer = (const void *) (((const unsigned char *) buffer) + templen);
len -= templen;
}
}
}
void SHA256Finalize(SHA256Context *sha, unsigned char hash[SHA256_HASH_SIZE]) {
u_int64_t totalBits;
if(hash) {
if(sha->inputLen >= 56) {
sha->input[(sha->inputLen)++] = (unsigned char) 0x80;
while(sha->inputLen < 64) {
sha->input[(sha->inputLen)++] = (unsigned char) 0x00;
}
ProcessBlock(sha, sha->input);
sha->inputLen = 0;
} else {
sha->input[(sha->inputLen)++] = (unsigned char) 0x80;
}
while(sha->inputLen < 56) {
sha->input[(sha->inputLen)++] = (unsigned char) 0x00;
}
totalBits = (sha->totalLen << 3);
WriteLong(sha->input + 56, (u_int32_t) (totalBits >> 32));
WriteLong(sha->input + 60, (u_int32_t) totalBits);
ProcessBlock(sha, sha->input);
WriteLong(hash, sha->A);
WriteLong(hash + 4, sha->B);
WriteLong(hash + 8, sha->C);
WriteLong(hash + 12, sha->D);
WriteLong(hash + 16, sha->E);
WriteLong(hash + 20, sha->F);
WriteLong(hash + 24, sha->G);
WriteLong(hash + 28, sha->H);
}
DoMemZero(sha, sizeof(SHA256Context));
}
void SHA256Init(SHA256Context *sha) {
sha->inputLen = 0;
sha->A = 0x6a09e667;
sha->B = 0xbb67ae85;
sha->C = 0x3c6ef372;
sha->D = 0xa54ff53a;
sha->E = 0x510e527f;
sha->F = 0x9b05688c;
sha->G = 0x1f83d9ab;
sha->H = 0x5be0cd19;
sha->totalLen = 0;
}
static void WriteLong(unsigned char *buf, u_int32_t value) {
buf[0] = (unsigned char)(value >> 24);
buf[1] = (unsigned char)(value >> 16);
buf[2] = (unsigned char)(value >> 8);
buf[3] = (unsigned char)value;
}
unsigned char* get_sha256_hash(const char* unhashed) {
SHA256Context sha;
unsigned char* hash = (unsigned char*) malloc(32);
SHA256Init(&sha);
SHA256Data(&sha, unhashed, strlen(unhashed));
SHA256Finalize(&sha, hash);
return hash;
}
char* get_sha256_hash_hex_str(const char* unhashed) {
unsigned char* hashed = get_sha256_hash(unhashed);
char* hashed_hex = (char*) malloc(65);
char next_hex[3];
int index =0;
hashed_hex[0] = '\0';
for(index=0; index < 32; index++) {
sprintf(next_hex, "%02X", hashed[index]);
strcat(hashed_hex, next_hex);
}
free(hashed);
return hashed_hex;
}

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#ifndef __SHA256_H
#define __SHA256_H
#define DoMemZero(dest,len) (memset((dest), 0, (len)))
#if SIZEOF_LONG > 4
#define TRUNCLONG(x) ((x) & IL_MAX_UINT32)
#define ROTATE(x,n) (TRUNCLONG(((x) >> (n))) | ((x) << (32 - (n))))
#define SHIFT(x,n) (TRUNCLONG(((x) >> (n))))
#else
#define TRUNCLONG(x) (x)
#define ROTATE(x,n) (((x) >> (n)) | ((x) << (32 - (n))))
#define SHIFT(x,n) ((x) >> (n))
#endif
#define CH(x,y,z) (((x) & (y)) ^ (TRUNCLONG(~(x)) & (z)))
#define MAJ(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
#define SUM0(x) (ROTATE((x), 2) ^ ROTATE((x), 13) ^ ROTATE((x), 22))
#define SUM1(x) (ROTATE((x), 6) ^ ROTATE((x), 11) ^ ROTATE((x), 25))
#define RHO0(x) (ROTATE((x), 7) ^ ROTATE((x), 18) ^ SHIFT((x), 3))
#define RHO1(x) (ROTATE((x), 17) ^ ROTATE((x), 19) ^ SHIFT((x), 10))
#define SHA256_HASH_SIZE 32
typedef struct _tagSHA256Context {
unsigned char input[64];
u_int32_t inputLen;
u_int32_t A, B, C, D, E, F, G, H;
u_int64_t totalLen;
} SHA256Context;
static u_int32_t const K[64] = {
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
static void ProcessBlock(SHA256Context *sha, const unsigned char *block);
void SHA256Data(SHA256Context *sha, const void *buffer, unsigned long len);
void SHA256Finalize(SHA256Context *sha, unsigned char hash[SHA256_HASH_SIZE]);
void SHA256Init(SHA256Context *sha);
static void WriteLong(unsigned char *buf, u_int32_t value);
extern unsigned char* get_sha256_hash(const char* unhashed);
extern char* get_sha256_hash_hex_str(const char* unhashed);
#endif