Source from upstream; imap-2007f.tar.gz
MD5 2126fd125ea26b73b20f01fcd5940369
This commit is contained in:
Chris
495
src/c-client/auth_md5.c
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495
src/c-client/auth_md5.c
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/* ========================================================================
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* Copyright 1988-2007 University of Washington
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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*
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* ========================================================================
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*/
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/*
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* Program: CRAM-MD5 authenticator
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*
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* Author: Mark Crispin
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* Networks and Distributed Computing
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* Computing & Communications
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* University of Washington
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* Administration Building, AG-44
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* Seattle, WA 98195
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* Internet: MRC@CAC.Washington.EDU
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*
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* Date: 21 October 1998
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* Last Edited: 30 January 2007
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*/
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/* MD5 context */
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#define MD5BLKLEN 64 /* MD5 block length */
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#define MD5DIGLEN 16 /* MD5 digest length */
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typedef struct {
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unsigned long chigh; /* high 32bits of byte count */
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unsigned long clow; /* low 32bits of byte count */
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unsigned long state[4]; /* state (ABCD) */
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unsigned char buf[MD5BLKLEN]; /* input buffer */
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unsigned char *ptr; /* buffer position */
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} MD5CONTEXT;
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/* Prototypes */
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long auth_md5_valid (void);
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long auth_md5_client (authchallenge_t challenger,authrespond_t responder,
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char *service,NETMBX *mb,void *stream,
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unsigned long *trial,char *user);
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char *auth_md5_server (authresponse_t responder,int argc,char *argv[]);
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char *auth_md5_pwd (char *user);
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char *apop_login (char *chal,char *user,char *md5,int argc,char *argv[]);
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char *hmac_md5 (char *text,unsigned long tl,char *key,unsigned long kl);
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void md5_init (MD5CONTEXT *ctx);
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void md5_update (MD5CONTEXT *ctx,unsigned char *data,unsigned long len);
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void md5_final (unsigned char *digest,MD5CONTEXT *ctx);
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static void md5_transform (unsigned long *state,unsigned char *block);
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static void md5_encode (unsigned char *dst,unsigned long *src,int len);
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static void md5_decode (unsigned long *dst,unsigned char *src,int len);
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/* Authenticator linkage */
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AUTHENTICATOR auth_md5 = {
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AU_SECURE, /* secure authenticator */
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"CRAM-MD5", /* authenticator name */
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auth_md5_valid, /* check if valid */
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auth_md5_client, /* client method */
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auth_md5_server, /* server method */
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NIL /* next authenticator */
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};
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/* Check if CRAM-MD5 valid on this system
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* Returns: T, always
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*/
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long auth_md5_valid (void)
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{
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struct stat sbuf;
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/* server forbids MD5 if no MD5 enable file */
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if (stat (MD5ENABLE,&sbuf)) auth_md5.server = NIL;
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return T; /* MD5 is otherwise valid */
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}
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/* Client authenticator
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* Accepts: challenger function
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* responder function
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* SASL service name
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* parsed network mailbox structure
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* stream argument for functions
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* pointer to current trial count
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* returned user name
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* Returns: T if success, NIL otherwise, number of trials incremented if retry
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*/
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long auth_md5_client (authchallenge_t challenger,authrespond_t responder,
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char *service,NETMBX *mb,void *stream,
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unsigned long *trial,char *user)
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{
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char pwd[MAILTMPLEN];
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void *challenge;
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unsigned long clen;
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long ret = NIL;
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/* get challenge */
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if (challenge = (*challenger) (stream,&clen)) {
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pwd[0] = NIL; /* prompt user */
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mm_login (mb,user,pwd,*trial);
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if (!pwd[0]) { /* user requested abort */
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fs_give ((void **) &challenge);
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(*responder) (stream,NIL,0);
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*trial = 0; /* cancel subsequent attempts */
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ret = LONGT; /* will get a BAD response back */
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}
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else { /* got password, build response */
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sprintf (pwd,"%.65s %.33s",user,hmac_md5 (challenge,clen,
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pwd,strlen (pwd)));
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fs_give ((void **) &challenge);
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/* send credentials, allow retry if OK */
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if ((*responder) (stream,pwd,strlen (pwd))) {
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if (challenge = (*challenger) (stream,&clen))
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fs_give ((void **) &challenge);
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else {
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++*trial; /* can try again if necessary */
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ret = LONGT; /* check the authentication */
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}
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}
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}
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}
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memset (pwd,0,MAILTMPLEN); /* erase password in case not overwritten */
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if (!ret) *trial = 65535; /* don't retry if bad protocol */
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return ret;
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}
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/* Server authenticator
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* Accepts: responder function
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* argument count
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* argument vector
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* Returns: authenticated user name or NIL
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*
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* This is much hairier than it needs to be due to the necessary of zapping
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* the password data.
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*/
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static int md5try = MAXLOGINTRIALS;
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char *auth_md5_server (authresponse_t responder,int argc,char *argv[])
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{
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char *ret = NIL;
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char *p,*u,*user,*authuser,*hash,chal[MAILTMPLEN];
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unsigned long cl,pl;
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/* generate challenge */
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sprintf (chal,"<%lu.%lu@%s>",(unsigned long) getpid (),
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(unsigned long) time (0),mylocalhost ());
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/* send challenge, get user and hash */
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if (user = (*responder) (chal,cl = strlen (chal),NIL)) {
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/* got user, locate hash */
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if (hash = strrchr (user,' ')) {
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*hash++ = '\0'; /* tie off user */
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/* see if authentication user */
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if (authuser = strchr (user,'*')) *authuser++ = '\0';
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/* get password */
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if (p = auth_md5_pwd ((authuser && *authuser) ? authuser : user)) {
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pl = strlen (p);
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u = (md5try && !strcmp (hash,hmac_md5 (chal,cl,p,pl))) ? user : NIL;
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memset (p,0,pl); /* erase sensitive information */
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fs_give ((void **) &p); /* flush erased password */
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/* now log in for real */
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if (u && authserver_login (u,authuser,argc,argv)) ret = myusername ();
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else if (md5try) --md5try;
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}
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}
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fs_give ((void **) &user);
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}
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if (!ret) sleep (3); /* slow down possible cracker */
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return ret;
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}
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/* Return MD5 password for user
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* Accepts: user name
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* Returns: plaintext password if success, else NIL
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*
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* This is much hairier than it needs to be due to the necessary of zapping
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* the password data. That's why we don't use stdio here.
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*/
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char *auth_md5_pwd (char *user)
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{
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struct stat sbuf;
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int fd = open (MD5ENABLE,O_RDONLY,NIL);
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unsigned char *s,*t,*buf,*lusr,*lret;
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char *r;
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char *ret = NIL;
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if (fd >= 0) { /* found the file? */
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fstat (fd,&sbuf); /* yes, slurp it into memory */
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read (fd,buf = (char *) fs_get (sbuf.st_size + 1),sbuf.st_size);
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/* see if any uppercase characters in user */
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for (s = user; *s && ((*s < 'A') || (*s > 'Z')); s++);
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/* yes, make lowercase copy */
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lusr = *s ? lcase (cpystr (user)) : NIL;
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for (s = strtok_r ((char *) buf,"\015\012",&r),lret = NIL; s;
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s = ret ? NIL : strtok_r (NIL,"\015\012",&r))
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/* must be valid entry line */
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if (*s && (*s != '#') && (t = strchr (s,'\t')) && t[1]) {
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*t++ = '\0'; /* found tab, tie off user, point to pwd */
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if (!strcmp (s,user)) ret = cpystr (t);
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else if (lusr && !lret) if (!strcmp (s,lusr)) lret = t;
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}
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/* accept case-independent name */
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if (!ret && lret) ret = cpystr (lret);
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/* don't need lowercase copy any more */
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if (lusr) fs_give ((void **) &lusr);
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/* erase sensitive information from buffer */
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memset (buf,0,sbuf.st_size + 1);
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fs_give ((void **) &buf); /* flush the buffer */
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close (fd); /* don't need file any longer */
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}
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return ret; /* return password */
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}
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/* APOP server login
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* Accepts: challenge
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* desired user name
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* purported MD5
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* argument count
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* argument vector
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* Returns: authenticated user name or NIL
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*/
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char *apop_login (char *chal,char *user,char *md5,int argc,char *argv[])
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{
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int i,j;
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char *ret = NIL;
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char *s,*authuser,tmp[MAILTMPLEN];
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unsigned char digest[MD5DIGLEN];
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MD5CONTEXT ctx;
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char *hex = "0123456789abcdef";
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/* see if authentication user */
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if (authuser = strchr (user,'*')) *authuser++ = '\0';
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/* get password */
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if (s = auth_md5_pwd ((authuser && *authuser) ? authuser : user)) {
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md5_init (&ctx); /* initialize MD5 context */
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/* build string to get MD5 digest */
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sprintf (tmp,"%.128s%.128s",chal,s);
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memset (s,0,strlen (s)); /* erase sensitive information */
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fs_give ((void **) &s); /* flush erased password */
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md5_update (&ctx,(unsigned char *) tmp,strlen (tmp));
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memset (tmp,0,MAILTMPLEN); /* erase sensitive information */
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md5_final (digest,&ctx);
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/* convert to printable hex */
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for (i = 0, s = tmp; i < MD5DIGLEN; i++) {
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*s++ = hex[(j = digest[i]) >> 4];
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*s++ = hex[j & 0xf];
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}
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*s = '\0'; /* tie off hash text */
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memset (digest,0,MD5DIGLEN);/* erase sensitive information */
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if (md5try && !strcmp (md5,tmp) &&
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authserver_login (user,authuser,argc,argv))
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ret = cpystr (myusername ());
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else if (md5try) --md5try;
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memset (tmp,0,MAILTMPLEN); /* erase sensitive information */
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}
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if (!ret) sleep (3); /* slow down possible cracker */
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return ret;
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}
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/*
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* RFC 2104 HMAC hashing
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* Accepts: text to hash
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* text length
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* key
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* key length
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* Returns: hash as text, always
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*/
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char *hmac_md5 (char *text,unsigned long tl,char *key,unsigned long kl)
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{
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int i,j;
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static char hshbuf[2*MD5DIGLEN + 1];
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char *s;
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MD5CONTEXT ctx;
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char *hex = "0123456789abcdef";
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unsigned char digest[MD5DIGLEN],k_ipad[MD5BLKLEN+1],k_opad[MD5BLKLEN+1];
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if (kl > MD5BLKLEN) { /* key longer than pad length? */
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md5_init (&ctx); /* yes, set key as MD5(key) */
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md5_update (&ctx,(unsigned char *) key,kl);
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md5_final (digest,&ctx);
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key = (char *) digest;
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kl = MD5DIGLEN;
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}
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memcpy (k_ipad,key,kl); /* store key in pads */
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memset (k_ipad+kl,0,(MD5BLKLEN+1)-kl);
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memcpy (k_opad,k_ipad,MD5BLKLEN+1);
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/* XOR key with ipad and opad values */
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for (i = 0; i < MD5BLKLEN; i++) {
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k_ipad[i] ^= 0x36;
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k_opad[i] ^= 0x5c;
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}
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md5_init (&ctx); /* inner MD5: hash ipad and text */
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md5_update (&ctx,k_ipad,MD5BLKLEN);
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md5_update (&ctx,(unsigned char *) text,tl);
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md5_final (digest,&ctx);
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md5_init (&ctx); /* outer MD5: hash opad and inner results */
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md5_update (&ctx,k_opad,MD5BLKLEN);
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md5_update (&ctx,digest,MD5DIGLEN);
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md5_final (digest,&ctx);
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/* convert to printable hex */
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for (i = 0, s = hshbuf; i < MD5DIGLEN; i++) {
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*s++ = hex[(j = digest[i]) >> 4];
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*s++ = hex[j & 0xf];
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}
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*s = '\0'; /* tie off hash text */
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return hshbuf;
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}
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/* Everything after this point is derived from the RSA Data Security, Inc.
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* MD5 Message-Digest Algorithm
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*/
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/* You may wonder why these strange "a &= 0xffffffff;" statements are here.
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* This is to ensure correct results on machines with a unsigned long size of
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* larger than 32 bits.
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*/
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#define RND1(a,b,c,d,x,s,ac) \
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a += ((b & c) | (d & ~b)) + x + (unsigned long) ac; \
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a &= 0xffffffff; \
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a = b + ((a << s) | (a >> (32 - s)));
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#define RND2(a,b,c,d,x,s,ac) \
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a += ((b & d) | (c & ~d)) + x + (unsigned long) ac; \
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a &= 0xffffffff; \
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a = b + ((a << s) | (a >> (32 - s)));
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#define RND3(a,b,c,d,x,s,ac) \
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a += (b ^ c ^ d) + x + (unsigned long) ac; \
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a &= 0xffffffff; \
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a = b + ((a << s) | (a >> (32 - s)));
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#define RND4(a,b,c,d,x,s,ac) \
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a += (c ^ (b | ~d)) + x + (unsigned long) ac; \
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a &= 0xffffffff; \
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a = b + ((a << s) | (a >> (32 - s)));
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/* Initialize MD5 context
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* Accepts: context to initialize
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*/
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void md5_init (MD5CONTEXT *ctx)
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{
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ctx->clow = ctx->chigh = 0; /* initialize byte count to zero */
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/* initialization constants */
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ctx->state[0] = 0x67452301; ctx->state[1] = 0xefcdab89;
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ctx->state[2] = 0x98badcfe; ctx->state[3] = 0x10325476;
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ctx->ptr = ctx->buf; /* reset buffer pointer */
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}
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/* MD5 add data to context
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* Accepts: context
|
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* input data
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* length of data
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*/
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void md5_update (MD5CONTEXT *ctx,unsigned char *data,unsigned long len)
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{
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unsigned long i = (ctx->buf + MD5BLKLEN) - ctx->ptr;
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/* update double precision number of bytes */
|
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if ((ctx->clow += len) < len) ctx->chigh++;
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while (i <= len) { /* copy/transform data, 64 bytes at a time */
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memcpy (ctx->ptr,data,i); /* fill up 64 byte chunk */
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md5_transform (ctx->state,ctx->ptr = ctx->buf);
|
||||
data += i,len -= i,i = MD5BLKLEN;
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}
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memcpy (ctx->ptr,data,len); /* copy final bit of data in buffer */
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||||
ctx->ptr += len; /* update buffer pointer */
|
||||
}
|
||||
|
||||
/* MD5 Finalization
|
||||
* Accepts: destination digest
|
||||
* context
|
||||
*/
|
||||
|
||||
void md5_final (unsigned char *digest,MD5CONTEXT *ctx)
|
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{
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||||
unsigned long i,bits[2];
|
||||
bits[0] = ctx->clow << 3; /* calculate length in bits (before padding) */
|
||||
bits[1] = (ctx->chigh << 3) + (ctx->clow >> 29);
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*ctx->ptr++ = 0x80; /* padding byte */
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if ((i = (ctx->buf + MD5BLKLEN) - ctx->ptr) < 8) {
|
||||
memset (ctx->ptr,0,i); /* pad out buffer with zeros */
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md5_transform (ctx->state,ctx->buf);
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||||
/* pad out with zeros, leaving 8 bytes */
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memset (ctx->buf,0,MD5BLKLEN - 8);
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ctx->ptr = ctx->buf + MD5BLKLEN - 8;
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}
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else if (i -= 8) { /* need to pad this buffer? */
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memset (ctx->ptr,0,i); /* yes, pad out with zeros, leaving 8 bytes */
|
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ctx->ptr += i;
|
||||
}
|
||||
md5_encode (ctx->ptr,bits,2); /* make LSB-first length */
|
||||
md5_transform (ctx->state,ctx->buf);
|
||||
/* store state in digest */
|
||||
md5_encode (digest,ctx->state,4);
|
||||
/* erase context */
|
||||
memset (ctx,0,sizeof (MD5CONTEXT));
|
||||
}
|
||||
|
||||
/* MD5 basic transformation
|
||||
* Accepts: state vector
|
||||
* current 64-byte block
|
||||
*/
|
||||
|
||||
static void md5_transform (unsigned long *state,unsigned char *block)
|
||||
{
|
||||
unsigned long a = state[0],b = state[1],c = state[2],d = state[3],x[16];
|
||||
md5_decode (x,block,16); /* decode into 16 longs */
|
||||
/* round 1 */
|
||||
RND1 (a,b,c,d,x[ 0], 7,0xd76aa478); RND1 (d,a,b,c,x[ 1],12,0xe8c7b756);
|
||||
RND1 (c,d,a,b,x[ 2],17,0x242070db); RND1 (b,c,d,a,x[ 3],22,0xc1bdceee);
|
||||
RND1 (a,b,c,d,x[ 4], 7,0xf57c0faf); RND1 (d,a,b,c,x[ 5],12,0x4787c62a);
|
||||
RND1 (c,d,a,b,x[ 6],17,0xa8304613); RND1 (b,c,d,a,x[ 7],22,0xfd469501);
|
||||
RND1 (a,b,c,d,x[ 8], 7,0x698098d8); RND1 (d,a,b,c,x[ 9],12,0x8b44f7af);
|
||||
RND1 (c,d,a,b,x[10],17,0xffff5bb1); RND1 (b,c,d,a,x[11],22,0x895cd7be);
|
||||
RND1 (a,b,c,d,x[12], 7,0x6b901122); RND1 (d,a,b,c,x[13],12,0xfd987193);
|
||||
RND1 (c,d,a,b,x[14],17,0xa679438e); RND1 (b,c,d,a,x[15],22,0x49b40821);
|
||||
/* round 2 */
|
||||
RND2 (a,b,c,d,x[ 1], 5,0xf61e2562); RND2 (d,a,b,c,x[ 6], 9,0xc040b340);
|
||||
RND2 (c,d,a,b,x[11],14,0x265e5a51); RND2 (b,c,d,a,x[ 0],20,0xe9b6c7aa);
|
||||
RND2 (a,b,c,d,x[ 5], 5,0xd62f105d); RND2 (d,a,b,c,x[10], 9, 0x2441453);
|
||||
RND2 (c,d,a,b,x[15],14,0xd8a1e681); RND2 (b,c,d,a,x[ 4],20,0xe7d3fbc8);
|
||||
RND2 (a,b,c,d,x[ 9], 5,0x21e1cde6); RND2 (d,a,b,c,x[14], 9,0xc33707d6);
|
||||
RND2 (c,d,a,b,x[ 3],14,0xf4d50d87); RND2 (b,c,d,a,x[ 8],20,0x455a14ed);
|
||||
RND2 (a,b,c,d,x[13], 5,0xa9e3e905); RND2 (d,a,b,c,x[ 2], 9,0xfcefa3f8);
|
||||
RND2 (c,d,a,b,x[ 7],14,0x676f02d9); RND2 (b,c,d,a,x[12],20,0x8d2a4c8a);
|
||||
/* round 3 */
|
||||
RND3 (a,b,c,d,x[ 5], 4,0xfffa3942); RND3 (d,a,b,c,x[ 8],11,0x8771f681);
|
||||
RND3 (c,d,a,b,x[11],16,0x6d9d6122); RND3 (b,c,d,a,x[14],23,0xfde5380c);
|
||||
RND3 (a,b,c,d,x[ 1], 4,0xa4beea44); RND3 (d,a,b,c,x[ 4],11,0x4bdecfa9);
|
||||
RND3 (c,d,a,b,x[ 7],16,0xf6bb4b60); RND3 (b,c,d,a,x[10],23,0xbebfbc70);
|
||||
RND3 (a,b,c,d,x[13], 4,0x289b7ec6); RND3 (d,a,b,c,x[ 0],11,0xeaa127fa);
|
||||
RND3 (c,d,a,b,x[ 3],16,0xd4ef3085); RND3 (b,c,d,a,x[ 6],23, 0x4881d05);
|
||||
RND3 (a,b,c,d,x[ 9], 4,0xd9d4d039); RND3 (d,a,b,c,x[12],11,0xe6db99e5);
|
||||
RND3 (c,d,a,b,x[15],16,0x1fa27cf8); RND3 (b,c,d,a,x[ 2],23,0xc4ac5665);
|
||||
/* round 4 */
|
||||
RND4 (a,b,c,d,x[ 0], 6,0xf4292244); RND4 (d,a,b,c,x[ 7],10,0x432aff97);
|
||||
RND4 (c,d,a,b,x[14],15,0xab9423a7); RND4 (b,c,d,a,x[ 5],21,0xfc93a039);
|
||||
RND4 (a,b,c,d,x[12], 6,0x655b59c3); RND4 (d,a,b,c,x[ 3],10,0x8f0ccc92);
|
||||
RND4 (c,d,a,b,x[10],15,0xffeff47d); RND4 (b,c,d,a,x[ 1],21,0x85845dd1);
|
||||
RND4 (a,b,c,d,x[ 8], 6,0x6fa87e4f); RND4 (d,a,b,c,x[15],10,0xfe2ce6e0);
|
||||
RND4 (c,d,a,b,x[ 6],15,0xa3014314); RND4 (b,c,d,a,x[13],21,0x4e0811a1);
|
||||
RND4 (a,b,c,d,x[ 4], 6,0xf7537e82); RND4 (d,a,b,c,x[11],10,0xbd3af235);
|
||||
RND4 (c,d,a,b,x[ 2],15,0x2ad7d2bb); RND4 (b,c,d,a,x[ 9],21,0xeb86d391);
|
||||
/* update state */
|
||||
state[0] += a; state[1] += b; state[2] += c; state[3] += d;
|
||||
memset (x,0,sizeof (x)); /* erase sensitive data */
|
||||
}
|
||||
|
||||
/* You may wonder why these strange "& 0xff" maskings are here. This is to
|
||||
* ensure correct results on machines with a char size of larger than 8 bits.
|
||||
* For example, the KCC compiler on the PDP-10 uses 9-bit chars.
|
||||
*/
|
||||
|
||||
/* MD5 encode unsigned long into LSB-first bytes
|
||||
* Accepts: destination pointer
|
||||
* source
|
||||
* length of source
|
||||
*/
|
||||
|
||||
static void md5_encode (unsigned char *dst,unsigned long *src,int len)
|
||||
{
|
||||
int i;
|
||||
for (i = 0; i < len; i++) {
|
||||
*dst++ = (unsigned char) (src[i] & 0xff);
|
||||
*dst++ = (unsigned char) ((src[i] >> 8) & 0xff);
|
||||
*dst++ = (unsigned char) ((src[i] >> 16) & 0xff);
|
||||
*dst++ = (unsigned char) ((src[i] >> 24) & 0xff);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/* MD5 decode LSB-first bytes into unsigned long
|
||||
* Accepts: destination pointer
|
||||
* source
|
||||
* length of destination
|
||||
*/
|
||||
|
||||
static void md5_decode (unsigned long *dst,unsigned char *src,int len)
|
||||
{
|
||||
int i, j;
|
||||
for (i = 0, j = 0; i < len; i++, j += 4)
|
||||
dst[i] = ((unsigned long) (src[j] & 0xff)) |
|
||||
(((unsigned long) (src[j+1] & 0xff)) << 8) |
|
||||
(((unsigned long) (src[j+2] & 0xff)) << 16) |
|
||||
(((unsigned long) (src[j+3] & 0xff)) << 24);
|
||||
}
|
||||
Reference in New Issue
Block a user