-If everything compiles cleanly, but fails at authentication time, then
-it might be a case of the MD4 or DES code screwing up. The following
-small program can be used to test the MS-CHAP code to see if it
-produces a known response:
-
------------------
-#include <stdio.h>
-
-#include "pppd.h"
-#include "chap.h"
-#include "chap_ms.h"
-
-int main(argc, argv)
- int argc;
- char *argv[];
-{
- u_char challenge[8];
- int challengeInt[sizeof(challenge)];
- chap_state cstate;
- int i;
-
- if (argc != 3) {
- fprintf(stderr, "Usage: %s <16-hexchar challenge> <password>\n",
- argv[0]); exit(1);
- }
-
- sscanf(argv[1], "%2x%2x%2x%2x%2x%2x%2x%2x",
- challengeInt + 0, challengeInt + 1, challengeInt + 2,
- challengeInt + 3, challengeInt + 4, challengeInt + 5,
- challengeInt + 6, challengeInt + 7);
-
- for (i = 0; i < sizeof(challenge); i++)
- challenge[i] = (u_char)challengeInt[i];
-
- ChapMS(&cstate, challenge, argv[2], strlen(argv[2]),
- (MS_ChapResponse *)&cstate.response);
- printf("Response length is %d, response is:", cstate.resp_length);
-
- for (i = 0; i < cstate.resp_length; i++) {
- if (i % 8 == 0)
- putchar('\n');
- printf("%02X ", (unsigned int)cstate.response[i]);
- }
-
- putchar('\n');
-
- exit(0);
-}
--------------
-
-This needs to link against chap_ms.o, md4.o, sha1.o and the DES library.
-When you run it with the command line:
-
- $ testchap 00000000000000000000000000000000 hello
-
-it should output the following:
-
- Response length is 49, response is:
- 00 00 00 00 00 00 00 00
- 00 00 00 00 00 00 00 00
- 00 00 00 00 00 00 00 00
- F4 D9 9D AF 82 64 DC 3C
- 53 F9 BC 92 14 B5 5D 9E
- 78 C4 21 48 9D B7 A8 B4
- 01
-
-if not, then either the DES library is not working, the MD4 code isn't
-working, or there are some problems with the port of the code in
-chap_ms.c.
-
-
projects / ppp.git / commitdiff