BSD 4_1c_2 release

[unix-history] / usr / src / lib / libc / gen / ruserpass.c

/* Copyright (c) 1982 Regents of the University of California */

static char sccsid[] = "@(#)ruserpass.c 4.1 2/21/82";

#include <stdio.h>
#include <utmp.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>

char    *renvlook(), *malloc(), *index(), *getenv(), *getpass(), *getlogin();
struct  utmp *getutmp();
static  FILE *cfile;

ruserpass(host, aname, apass)
       char *host, **aname, **apass;
{

       renv(host, aname, apass);
       if (*aname == 0 || *apass == 0)
               rnetrc(host, aname, apass);
       if (*aname == 0) {
               char *myname = getlogin();
               *aname = malloc(16);
               printf("Name (%s:%s): ", host, myname);
               fflush(stdout);
               if (read(2, *aname, 16) <= 0)
                       exit(1);
               if ((*aname)[0] == '\n')
                       *aname = myname;
               else
                       if (index(*aname, '\n'))
                               *index(*aname, '\n') = 0;
       }
       if (*aname && *apass == 0) {
               printf("Password (%s:%s): ", host, *aname);
               fflush(stdout);
               *apass = getpass("");
       }
}

static
renv(host, aname, apass)
       char *host, **aname, **apass;
{
       register char *cp;
       char *stemp, fgetlogin, *comma;

       cp = renvlook(host);
       if (cp == NULL)
               return;
       if (!isalpha(cp[0]))
               return;
       comma = index(cp, ',');
       if (comma == 0)
               return;
       if (*aname == 0) {
               *aname = malloc(comma - cp + 1);
               strncpy(*aname, cp, comma - cp);
       } else
               if (strncmp(*aname, cp, comma - cp))
                       return;
       comma++;
       cp = malloc(strlen(comma)+1);
       strcpy(cp, comma);
       *apass = malloc(16);
       mkpwclear(cp, host[0], *apass);
}

static
char *
renvlook(host)
       char *host;
{
       register char *cp, **env;
       extern char **environ;

       env = environ;
       for (env = environ; *env != NULL; env++)
               if (!strncmp(*env, "MACH", 4)) {
                       cp = index(*env, '=');
                       if (cp == 0)
                               continue;
                       if (strncmp(*env+4, host, cp-(*env+4)))
                               continue;
                       return (cp+1);
               }
       return (NULL);
}

#define DEFAULT 1
#define LOGIN   2
#define PASSWD  3
#define NOTIFY  4
#define WRITE   5
#define YES     6
#define NO      7
#define COMMAND 8
#define FORCE   9
#define ID      10
#define MACHINE 11

static char tokval[100];

static struct toktab {
       char *tokstr;
       int tval;
} toktab[]= {
       "default",      DEFAULT,
       "login",        LOGIN,
       "password",     PASSWD,
       "notify",       NOTIFY,
       "write",        WRITE,
       "yes",          YES,
       "y",            YES,
       "no",           NO,
       "n",            NO,
       "command",      COMMAND,
       "force",        FORCE,
       "machine",      MACHINE,
       0,              0
};

static
rnetrc(host, aname, apass)
       char *host, **aname, **apass;
{
       char *hdir, buf[BUFSIZ];
       int t;
       struct stat stb;

       hdir = getenv("HOME");
       if (hdir == NULL)
               hdir = ".";
       sprintf(buf, "%s/.netrc", hdir);
       cfile = fopen(buf, "r");
       if (cfile == NULL) {
               perror(buf);
               return;
       }
next:
       while ((t = token())) switch(t) {

       case DEFAULT:
               (void) token();
               continue;

       case MACHINE:
               if (token() != ID || strcmp(host, tokval))
                       continue;
               while ((t = token()) && t != MACHINE) switch(t) {

               case LOGIN:
                       if (token())
                               if (*aname == 0) { 
                                       *aname = malloc(strlen(tokval) + 1);
                                       strcpy(*aname, tokval);
                               } else {
                                       if (strcmp(*aname, tokval))
                                               goto next;
                               }
                       break;
               case PASSWD:
                       if (fstat(fileno(cfile), &stb) >= 0
                           && (stb.st_mode & 077) != 0) {
       fprintf(stderr, "Error - .netrc file not correct mode.\n");
       fprintf(stderr, "Remove password or correct mode.\n");
                               exit(1);
                       }
                       if (token() && *apass == 0) {
                               *apass = malloc(strlen(tokval) + 1);
                               strcpy(*apass, tokval);
                       }
                       break;
               case COMMAND:
               case NOTIFY:
               case WRITE:
               case FORCE:
                       (void) token();
                       break;
               default:
       fprintf(stderr, "Unknown .netrc option %s\n", tokval);
                       break;
               }
               goto done;
       }
done:
       fclose(cfile);
}

static
token()
{
       char *cp;
       int c;
       struct toktab *t;

       if (feof(cfile))
               return (0);
       while ((c = getc(cfile)) != EOF &&
           (c == '\n' || c == '\t' || c == ' ' || c == ','))
               continue;
       if (c == EOF)
               return (0);
       cp = tokval;
       if (c == '"') {
               while ((c = getc(cfile)) != EOF && c != '"') {
                       if (c == '\\')
                               c = getc(cfile);
                       *cp++ = c;
               }
       } else {
               *cp++ = c;
               while ((c = getc(cfile)) != EOF
                   && c != '\n' && c != '\t' && c != ' ' && c != ',') {
                       if (c == '\\')
                               c = getc(cfile);
                       *cp++ = c;
               }
       }
       *cp = 0;
       if (tokval[0] == 0)
               return (0);
       for (t = toktab; t->tokstr; t++)
               if (!strcmp(t->tokstr, tokval))
                       return (t->tval);
       return (ID);
}
/* rest is nbs.c stolen from berknet */

char *deblknot(), *deblkclr();
char *nbs8decrypt(), *nbs8encrypt();
static char     E[48];

/*
* The E bit-selection table.
*/
static char     e[] = {
       32, 1, 2, 3, 4, 5,
        4, 5, 6, 7, 8, 9,
        8, 9,10,11,12,13,
       12,13,14,15,16,17,
       16,17,18,19,20,21,
       20,21,22,23,24,25,
       24,25,26,27,28,29,
       28,29,30,31,32, 1,
};
static
char *nbsencrypt(str,key,result)
 char *result;
 char *str, *key; {
       static char buf[20],oldbuf[20];
       register int j;
       result[0] = 0;
       strcpy(oldbuf,key);
       while(*str){
               for(j=0;j<10;j++)buf[j] = 0;
               for(j=0;j<8 && *str;j++)buf[j] = *str++;
               strcat(result,nbs8encrypt(buf,oldbuf));
               strcat(result,"$");
               strcpy(oldbuf,buf);
               }
       return(result);
       }
static
char *nbsdecrypt(cpt,key,result)
 char *result;
 char *cpt,*key; {
       char *s;
       char c,oldbuf[20];
       result[0] = 0;
       strcpy(oldbuf,key);
       while(*cpt){
               for(s = cpt;*s && *s != '$';s++);
               c = *s;
               *s = 0;
               strcpy(oldbuf,nbs8decrypt(cpt,oldbuf));
               strcat(result,oldbuf);
               if(c == 0)break;
               cpt = s + 1;
               }
       return(result);
       }

static
char *nbs8encrypt(str,key)
char *str, *key; {
       static char keyblk[100], blk[100];
       register int i;

       enblkclr(keyblk,key);
       nbssetkey(keyblk);

       for(i=0;i<48;i++) E[i] = e[i];
       enblkclr(blk,str);
       blkencrypt(blk,0);                      /* forward dir */

       return(deblknot(blk));
}

static
char *nbs8decrypt(crp,key)
char *crp, *key; {
       static char keyblk[100], blk[100];
       register int i;

       enblkclr(keyblk,key);
       nbssetkey(keyblk);

       for(i=0;i<48;i++) E[i] = e[i];
       enblknot(blk,crp);
       blkencrypt(blk,1);                      /* backward dir */

       return(deblkclr(blk));
}

static
enblkclr(blk,str)               /* ignores top bit of chars in string str */
char *blk,*str; {
       register int i,j;
       char c;
       for(i=0;i<70;i++)blk[i] = 0;
       for(i=0; (c= *str) && i<64; str++){
               for(j=0; j<7; j++, i++)
                       blk[i] = (c>>(6-j)) & 01;
               i++;
               }
       }

static
char *deblkclr(blk)
char *blk; {
       register int i,j;
       char c;
       static char iobuf[30];
       for(i=0; i<10; i++){
               c = 0;
               for(j=0; j<7; j++){
                       c <<= 1;
                       c |= blk[8*i+j];
                       }
               iobuf[i] = c;
       }
       iobuf[i] = 0;
       return(iobuf);
       }

static
enblknot(blk,crp)
char *blk;
char *crp; {
       register int i,j;
       char c;
       for(i=0;i<70;i++)blk[i] = 0;
       for(i=0; (c= *crp) && i<64; crp++){
               if(c>'Z') c -= 6;
               if(c>'9') c -= 7;
               c -= '.';
               for(j=0; j<6; j++, i++)
                       blk[i] = (c>>(5-j)) & 01;
               }
       }

static
char *deblknot(blk)
char *blk; {
       register int i,j;
       char c;
       static char iobuf[30];
       for(i=0; i<11; i++){
               c = 0;
               for(j=0; j<6; j++){
                       c <<= 1;
                       c |= blk[6*i+j];
                       }
               c += '.';
               if(c > '9')c += 7;
               if(c > 'Z')c += 6;
               iobuf[i] = c;
       }
       iobuf[i] = 0;
       return(iobuf);
}

/*
* This program implements the
* Proposed Federal Information Processing
*  Data Encryption Standard.
* See Federal Register, March 17, 1975 (40FR12134)
*/

/*
* Initial permutation,
*/
static  char    IP[] = {
       58,50,42,34,26,18,10, 2,
       60,52,44,36,28,20,12, 4,
       62,54,46,38,30,22,14, 6,
       64,56,48,40,32,24,16, 8,
       57,49,41,33,25,17, 9, 1,
       59,51,43,35,27,19,11, 3,
       61,53,45,37,29,21,13, 5,
       63,55,47,39,31,23,15, 7,
};

/*
* Final permutation, FP = IP^(-1)
*/
static  char    FP[] = {
       40, 8,48,16,56,24,64,32,
       39, 7,47,15,55,23,63,31,
       38, 6,46,14,54,22,62,30,
       37, 5,45,13,53,21,61,29,
       36, 4,44,12,52,20,60,28,
       35, 3,43,11,51,19,59,27,
       34, 2,42,10,50,18,58,26,
       33, 1,41, 9,49,17,57,25,
};

/*
* Permuted-choice 1 from the key bits
* to yield C and D.
* Note that bits 8,16... are left out:
* They are intended for a parity check.
*/
static  char    PC1_C[] = {
       57,49,41,33,25,17, 9,
        1,58,50,42,34,26,18,
       10, 2,59,51,43,35,27,
       19,11, 3,60,52,44,36,
};

static  char    PC1_D[] = {
       63,55,47,39,31,23,15,
        7,62,54,46,38,30,22,
       14, 6,61,53,45,37,29,
       21,13, 5,28,20,12, 4,
};

/*
* Sequence of shifts used for the key schedule.
*/
static  char    shifts[] = {
       1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1,
};

/*
* Permuted-choice 2, to pick out the bits from
* the CD array that generate the key schedule.
*/
static  char    PC2_C[] = {
       14,17,11,24, 1, 5,
        3,28,15, 6,21,10,
       23,19,12, 4,26, 8,
       16, 7,27,20,13, 2,
};

static  char    PC2_D[] = {
       41,52,31,37,47,55,
       30,40,51,45,33,48,
       44,49,39,56,34,53,
       46,42,50,36,29,32,
};

/*
* The C and D arrays used to calculate the key schedule.
*/

static  char    C[28];
static  char    D[28];
/*
* The key schedule.
* Generated from the key.
*/
static  char    KS[16][48];

/*
* Set up the key schedule from the key.
*/

static
nbssetkey(key)
char *key;
{
       register i, j, k;
       int t;

       /*
        * First, generate C and D by permuting
        * the key.  The low order bit of each
        * 8-bit char is not used, so C and D are only 28
        * bits apiece.
        */
       for (i=0; i<28; i++) {
               C[i] = key[PC1_C[i]-1];
               D[i] = key[PC1_D[i]-1];
       }
       /*
        * To generate Ki, rotate C and D according
        * to schedule and pick up a permutation
        * using PC2.
        */
       for (i=0; i<16; i++) {
               /*
                * rotate.
                */
               for (k=0; k<shifts[i]; k++) {
                       t = C[0];
                       for (j=0; j<28-1; j++)
                               C[j] = C[j+1];
                       C[27] = t;
                       t = D[0];
                       for (j=0; j<28-1; j++)
                               D[j] = D[j+1];
                       D[27] = t;
               }
               /*
                * get Ki. Note C and D are concatenated.
                */
               for (j=0; j<24; j++) {
                       KS[i][j] = C[PC2_C[j]-1];
                       KS[i][j+24] = D[PC2_D[j]-28-1];
               }
       }
}


/*
* The 8 selection functions.
* For some reason, they give a 0-origin
* index, unlike everything else.
*/
static  char    S[8][64] = {
       14, 4,13, 1, 2,15,11, 8, 3,10, 6,12, 5, 9, 0, 7,
        0,15, 7, 4,14, 2,13, 1,10, 6,12,11, 9, 5, 3, 8,
        4, 1,14, 8,13, 6, 2,11,15,12, 9, 7, 3,10, 5, 0,
       15,12, 8, 2, 4, 9, 1, 7, 5,11, 3,14,10, 0, 6,13,

       15, 1, 8,14, 6,11, 3, 4, 9, 7, 2,13,12, 0, 5,10,
        3,13, 4, 7,15, 2, 8,14,12, 0, 1,10, 6, 9,11, 5,
        0,14, 7,11,10, 4,13, 1, 5, 8,12, 6, 9, 3, 2,15,
       13, 8,10, 1, 3,15, 4, 2,11, 6, 7,12, 0, 5,14, 9,

       10, 0, 9,14, 6, 3,15, 5, 1,13,12, 7,11, 4, 2, 8,
       13, 7, 0, 9, 3, 4, 6,10, 2, 8, 5,14,12,11,15, 1,
       13, 6, 4, 9, 8,15, 3, 0,11, 1, 2,12, 5,10,14, 7,
        1,10,13, 0, 6, 9, 8, 7, 4,15,14, 3,11, 5, 2,12,

        7,13,14, 3, 0, 6, 9,10, 1, 2, 8, 5,11,12, 4,15,
       13, 8,11, 5, 6,15, 0, 3, 4, 7, 2,12, 1,10,14, 9,
       10, 6, 9, 0,12,11, 7,13,15, 1, 3,14, 5, 2, 8, 4,
        3,15, 0, 6,10, 1,13, 8, 9, 4, 5,11,12, 7, 2,14,

        2,12, 4, 1, 7,10,11, 6, 8, 5, 3,15,13, 0,14, 9,
       14,11, 2,12, 4, 7,13, 1, 5, 0,15,10, 3, 9, 8, 6,
        4, 2, 1,11,10,13, 7, 8,15, 9,12, 5, 6, 3, 0,14,
       11, 8,12, 7, 1,14, 2,13, 6,15, 0, 9,10, 4, 5, 3,

       12, 1,10,15, 9, 2, 6, 8, 0,13, 3, 4,14, 7, 5,11,
       10,15, 4, 2, 7,12, 9, 5, 6, 1,13,14, 0,11, 3, 8,
        9,14,15, 5, 2, 8,12, 3, 7, 0, 4,10, 1,13,11, 6,
        4, 3, 2,12, 9, 5,15,10,11,14, 1, 7, 6, 0, 8,13,

        4,11, 2,14,15, 0, 8,13, 3,12, 9, 7, 5,10, 6, 1,
       13, 0,11, 7, 4, 9, 1,10,14, 3, 5,12, 2,15, 8, 6,
        1, 4,11,13,12, 3, 7,14,10,15, 6, 8, 0, 5, 9, 2,
        6,11,13, 8, 1, 4,10, 7, 9, 5, 0,15,14, 2, 3,12,

       13, 2, 8, 4, 6,15,11, 1,10, 9, 3,14, 5, 0,12, 7,
        1,15,13, 8,10, 3, 7, 4,12, 5, 6,11, 0,14, 9, 2,
        7,11, 4, 1, 9,12,14, 2, 0, 6,10,13,15, 3, 5, 8,
        2, 1,14, 7, 4,10, 8,13,15,12, 9, 0, 3, 5, 6,11,
};

/*
* P is a permutation on the selected combination
* of the current L and key.
*/
static  char    P[] = {
       16, 7,20,21,
       29,12,28,17,
        1,15,23,26,
        5,18,31,10,
        2, 8,24,14,
       32,27, 3, 9,
       19,13,30, 6,
       22,11, 4,25,
};

/*
* The current block, divided into 2 halves.
*/
static  char    L[32], R[32];
static  char    tempL[32];
static  char    f[32];

/*
* The combination of the key and the input, before selection.
*/
static  char    preS[48];

/*
* The payoff: encrypt a block.
*/

static
blkencrypt(block, edflag)
char *block;
{
       int i, ii;
       register t, j, k;

       /*
        * First, permute the bits in the input
        */
       for (j=0; j<64; j++)
               L[j] = block[IP[j]-1];
       /*
        * Perform an encryption operation 16 times.
        */
       for (ii=0; ii<16; ii++) {
               /*
                * Set direction
                */
               if (edflag)
                       i = 15-ii;
               else
                       i = ii;
               /*
                * Save the R array,
                * which will be the new L.
                */
               for (j=0; j<32; j++)
                       tempL[j] = R[j];
               /*
                * Expand R to 48 bits using the E selector;
                * exclusive-or with the current key bits.
                */
               for (j=0; j<48; j++)
                       preS[j] = R[E[j]-1] ^ KS[i][j];
               /*
                * The pre-select bits are now considered
                * in 8 groups of 6 bits each.
                * The 8 selection functions map these
                * 6-bit quantities into 4-bit quantities
                * and the results permuted
                * to make an f(R, K).
                * The indexing into the selection functions
                * is peculiar; it could be simplified by
                * rewriting the tables.
                */
               for (j=0; j<8; j++) {
                       t = 6*j;
                       k = S[j][(preS[t+0]<<5)+
                               (preS[t+1]<<3)+
                               (preS[t+2]<<2)+
                               (preS[t+3]<<1)+
                               (preS[t+4]<<0)+
                               (preS[t+5]<<4)];
                       t = 4*j;
                       f[t+0] = (k>>3)&01;
                       f[t+1] = (k>>2)&01;
                       f[t+2] = (k>>1)&01;
                       f[t+3] = (k>>0)&01;
               }
               /*
                * The new R is L ^ f(R, K).
                * The f here has to be permuted first, though.
                */
               for (j=0; j<32; j++)
                       R[j] = L[j] ^ f[P[j]-1];
               /*
                * Finally, the new L (the original R)
                * is copied back.
                */
               for (j=0; j<32; j++)
                       L[j] = tempL[j];
       }
       /*
        * The output L and R are reversed.
        */
       for (j=0; j<32; j++) {
               t = L[j];
               L[j] = R[j];
               R[j] = t;
       }
       /*
        * The final output
        * gets the inverse permutation of the very original.
        */
       for (j=0; j<64; j++)
               block[j] = L[FP[j]-1];
}
/*
       getutmp()
       return a pointer to the system utmp structure associated with
       terminal sttyname, e.g. "/dev/tty3"
       Is version independent-- will work on v6 systems
       return NULL if error
*/
static
struct utmp *getutmp(sttyname)
char *sttyname;
{
       static struct utmp utmpstr;
       FILE *fdutmp;

       if(sttyname == NULL || sttyname[0] == 0)return(NULL);

       fdutmp = fopen("/etc/utmp","r");
       if(fdutmp == NULL)return(NULL);

       while(fread(&utmpstr,1,sizeof utmpstr,fdutmp) == sizeof utmpstr)
               if(strcmp(utmpstr.ut_line,sttyname+5) == 0){
                       fclose(fdutmp);
                       return(&utmpstr);
               }
       fclose(fdutmp);
       return(NULL);
}

static
sreverse(sto, sfrom)
       register char *sto, *sfrom;
{
       register int i;

       i = strlen(sfrom);
       while (i >= 0)
               *sto++ = sfrom[i--];
}

static
char *mkenvkey(mch)
       char mch;
{
       static char skey[40];
       register struct utmp *putmp;
       char stemp[40], stemp1[40], sttyname[30];
       register char *sk,*p;

       if (isatty(2))
               strcpy(sttyname,ttyname(2));
       else if (isatty(0))
               strcpy(sttyname,ttyname(0));
       else if (isatty(1))
               strcpy(sttyname,ttyname(1));
       else
               return (NULL);
       putmp = getutmp(sttyname);
       if (putmp == NULL)
               return (NULL);
       sk = skey;
       p = putmp->ut_line;
       while (*p)
               *sk++ = *p++;
       *sk++ = mch;
       sprintf(stemp, "%ld", putmp->ut_time);
       sreverse(stemp1, stemp);
       p = stemp1;
       while (*p)
               *sk++ = *p++;
       *sk = 0;
       return (skey);
}

mkpwunclear(spasswd,mch,sencpasswd)
       char mch, *spasswd, *sencpasswd;
{
       register char *skey;

       if (spasswd[0] == 0) {
               sencpasswd[0] = 0;
               return;
       }
       skey = mkenvkey(mch);
       if (skey == NULL) {
               fprintf(stderr, "Can't make key\n");
               exit(1);
       }
       nbsencrypt(spasswd, skey, sencpasswd);
}

mkpwclear(sencpasswd,mch,spasswd)
       char mch, *spasswd, *sencpasswd;
{
       register char *skey;

       if (sencpasswd[0] == 0) {
               spasswd[0] = 0;
               return;
       }
       skey = mkenvkey(mch);
       if (skey == NULL) {
               fprintf(stderr, "Can't make key\n");
               exit(1);
       }
       nbsdecrypt(sencpasswd, skey, spasswd);
}