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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright (C) 1992,1993 Trusted Information Systems, Inc.
*
* Permission to include this software in the Kerberos V5 distribution
* was graciously provided by Trusted Information Systems.
*
* Trusted Information Systems makes no representation about the
* suitability of this software for any purpose. It is provided
* "as is" without express or implied warranty.
*/
/*
* Copyright (C) 1994 Massachusetts Institute of Technology
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
/*****************************************************************************
* trval.c.c
*****************************************************************************/
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#define OK 0
#define NOTOK (-1)
/* IDENTIFIER OCTET = TAG CLASS | FORM OF ENCODING | TAG NUMBER */
/* TAG CLASSES */
#define ID_CLASS 0xc0 /* bits 8 and 7 */
#define CLASS_UNIV 0x00 /* 0 = universal */
#define CLASS_APPL 0x40 /* 1 = application */
#define CLASS_CONT 0x80 /* 2 = context-specific */
#define CLASS_PRIV 0xc0 /* 3 = private */
/* FORM OF ENCODING */
#define ID_FORM 0x20 /* bit 6 */
#define FORM_PRIM 0x00 /* 0 = primitive */
#define FORM_CONS 0x20 /* 1 = constructed */
/* TAG NUMBERS */
#define ID_TAG 0x1f /* bits 5-1 */
#define PRIM_BOOL 0x01 /* Boolean */
#define PRIM_INT 0x02 /* Integer */
#define PRIM_BITS 0x03 /* Bit String */
#define PRIM_OCTS 0x04 /* Octet String */
#define PRIM_NULL 0x05 /* Null */
#define PRIM_OID 0x06 /* Object Identifier */
#define PRIM_ODE 0x07 /* Object Descriptor */
#define CONS_EXTN 0x08 /* External */
#define PRIM_REAL 0x09 /* Real */
#define PRIM_ENUM 0x0a /* Enumerated type */
#define PRIM_ENCR 0x0b /* Encrypted */
#define CONS_SEQ 0x10 /* SEQUENCE/SEQUENCE OF */
#define CONS_SET 0x11 /* SET/SET OF */
#define DEFN_NUMS 0x12 /* Numeric String */
#define DEFN_PRTS 0x13 /* Printable String */
#define DEFN_T61S 0x14 /* T.61 String */
#define DEFN_VTXS 0x15 /* Videotex String */
#define DEFN_IA5S 0x16 /* IA5 String */
#define DEFN_UTCT 0x17 /* UTCTime */
#define DEFN_GENT 0x18 /* Generalized Time */
#define DEFN_GFXS 0x19 /* Graphics string (ISO2375) */
#define DEFN_VISS 0x1a /* Visible string */
#define DEFN_GENS 0x1b /* General string */
#define DEFN_CHRS 0x1c /* Character string */
#define LEN_XTND 0x80 /* long or indefinite form */
#define LEN_SMAX 127 /* largest short form */
#define LEN_MASK 0x7f /* mask to get number of bytes in length */
#define LEN_INDF (-1) /* indefinite length */
#define KRB5 /* Do krb5 application types */
int print_types = 0;
int print_id_and_len = 1;
int print_constructed_length = 1;
int print_primitive_length = 1;
int print_skip_context = 0;
int print_skip_tagnum = 1;
int print_context_shortcut = 0;
int do_hex = 0;
#ifdef KRB5
int print_krb5_types = 0;
#endif
int current_appl_type = -1;
int decode_len (FILE *, unsigned char *, int);
int do_prim (FILE *, int, unsigned char *, int, int);
int do_cons (FILE *, unsigned char *, int, int, int *);
int do_prim_bitstring (FILE *, int, unsigned char *, int, int);
int do_prim_int (FILE *, int, unsigned char *, int, int);
int do_prim_string (FILE *, int, unsigned char *, int, int);
void print_tag_type (FILE *, int, int);
int trval (FILE *, FILE *);
int trval2 (FILE *, unsigned char *, int, int, int *);
/****************************************************************************/
static int convert_nibble(int ch)
{
if (isdigit(ch))
return (ch - '0');
if (ch >= 'a' && ch <= 'f')
return (ch - 'a' + 10);
if (ch >= 'A' && ch <= 'F')
return (ch - 'A' + 10);
return -1;
}
int trval(fin, fout)
FILE *fin;
FILE *fout;
{
unsigned char *p;
unsigned int maxlen;
int len;
int cc, cc2, n1, n2;
int r;
int rlen;
maxlen = BUFSIZ;
p = (unsigned char *)malloc(maxlen);
len = 0;
while ((cc = fgetc(fin)) != EOF) {
if ((unsigned int) len == maxlen) {
maxlen += BUFSIZ;
p = (unsigned char *)realloc(p, maxlen);
}
if (do_hex) {
if (cc == ' ' || cc == '\n' || cc == '\t')
continue;
cc2 = fgetc(fin);
if (cc2 == EOF)
break;
n1 = convert_nibble(cc);
n2 = convert_nibble(cc2);
cc = (n1 << 4) + n2;
}
p[len++] = cc;
}
fprintf(fout, "<%d>", len);
r = trval2(fout, p, len, 0, &rlen);
fprintf(fout, "\n");
(void) free(p);
return(r);
}
int trval2(fp, enc, len, lev, rlen)
FILE *fp;
unsigned char *enc;
int len;
int lev;
int *rlen;
{
int l, eid, elen, xlen, r, rlen2 = 0;
int rlen_ext = 0;
r = OK;
if (len < 2) {
fprintf(fp, "missing id and length octets (%d)\n", len);
return(NOTOK);
}
fprintf(fp, "\n");
for (l=0; l<lev; l++) fprintf(fp, ". ");
context_restart:
eid = enc[0];
elen = enc[1];
if (print_id_and_len) {
fprintf(fp, "%02x ", eid);
fprintf(fp, "%02x ", elen);
}
if (elen == LEN_XTND) {
fprintf(fp,
"indefinite length encoding not implemented (0x%02x)\n", elen);
return(NOTOK);
}
xlen = 0;
if (elen & LEN_XTND) {
xlen = elen & LEN_MASK;
if (xlen > len - 2) {
fprintf(fp, "extended length too long (%d > %d - 2)\n", xlen, len);
return(NOTOK);
}
elen = decode_len(fp, enc+2, xlen);
}
if (elen > len - 2 - xlen) {
fprintf(fp, "length too long (%d > %d - 2 - %d)\n", elen, len, xlen);
return(NOTOK);
}
print_tag_type(fp, eid, lev);
if (print_context_shortcut && (eid & ID_CLASS) == CLASS_CONT &&
(eid & ID_FORM) == FORM_CONS && lev > 0) {
rlen_ext += 2 + xlen;
enc += 2 + xlen;
fprintf(fp, " ");
goto context_restart;
}
switch(eid & ID_FORM) {
case FORM_PRIM:
r = do_prim(fp, eid & ID_TAG, enc+2+xlen, elen, lev+1);
*rlen = 2 + xlen + elen + rlen_ext;
break;
case FORM_CONS:
if (print_constructed_length) {
fprintf(fp, " constr");
fprintf(fp, " <%d>", elen);
}
r = do_cons(fp, enc+2+xlen, elen, lev+1, &rlen2);
*rlen = 2 + xlen + rlen2 + rlen_ext;
break;
}
return(r);
}
int decode_len(fp, enc, len)
FILE *fp;
unsigned char *enc;
int len;
{
int rlen;
int i;
if (print_id_and_len)
fprintf(fp, "%02x ", enc[0]);
rlen = enc[0];
for (i=1; i<len; i++) {
if (print_id_and_len)
fprintf(fp, "%02x ", enc[i]);
rlen = (rlen * 0x100) + enc[i];
}
return(rlen);
}
/*
* This is the printing function for bit strings
*/
int do_prim_bitstring(fp, tag, enc, len, lev)
FILE *fp;
int tag;
unsigned char *enc;
int len;
int lev;
{
int i;
long num = 0;
if (tag != PRIM_BITS || len > 5)
return 0;
for (i=1; i < len; i++) {
num = num << 8;
num += enc[i];
}
fprintf(fp, " 0x%lx", num);
if (enc[0])
fprintf(fp, " (%d unused bits)", enc[0]);
return 1;
}
/*
* This is the printing function for integers
*/
int do_prim_int(fp, tag, enc, len, lev)
FILE *fp;
int tag;
unsigned char *enc;
int len;
int lev;
{
int i;
long num = 0;
if (tag != PRIM_INT || len > 4)
return 0;
if (enc[0] & 0x80)
num = -1;
for (i=0; i < len; i++) {
num = num << 8;
num += enc[i];
}
fprintf(fp, " %ld", num);
return 1;
}
/*
* This is the printing function which we use if it's a string or
* other other type which is best printed as a string
*/
int do_prim_string(fp, tag, enc, len, lev)
FILE *fp;
int tag;
unsigned char *enc;
int len;
int lev;
{
int i;
/*
* Only try this printing function with "reasonable" types
*/
if ((tag < DEFN_NUMS) && (tag != PRIM_OCTS))
return 0;
for (i=0; i < len; i++)
if (!isprint(enc[i]))
return 0;
fprintf(fp, " \"%.*s\"", len, enc);
return 1;
}
int do_prim(fp, tag, enc, len, lev)
FILE *fp;
int tag;
unsigned char *enc;
int len;
int lev;
{
int n;
int i;
int j;
int width;
if (do_prim_string(fp, tag, enc, len, lev))
return OK;
if (do_prim_int(fp, tag, enc, len, lev))
return OK;
if (do_prim_bitstring(fp, tag, enc, len, lev))
return OK;
if (print_primitive_length)
fprintf(fp, " <%d>", len);
width = (80 - (lev * 3) - 8) / 4;
for (n = 0; n < len; n++) {
if ((n % width) == 0) {
fprintf(fp, "\n");
for (i=0; i<lev; i++) fprintf(fp, " ");
}
fprintf(fp, "%02x ", enc[n]);
if ((n % width) == (width-1)) {
fprintf(fp, " ");
for (i=n-(width-1); i<=n; i++)
if (isprint(enc[i])) fprintf(fp, "%c", enc[i]);
else fprintf(fp, ".");
}
}
if ((j = (n % width)) != 0) {
fprintf(fp, " ");
for (i=0; i<width-j; i++) fprintf(fp, " ");
for (i=n-j; i<n; i++)
if (isprint(enc[i])) fprintf(fp, "%c", enc[i]);
else fprintf(fp, ".");
}
return(OK);
}
int do_cons(fp, enc, len, lev, rlen)
FILE *fp;
unsigned char *enc;
int len;
int lev;
int *rlen;
{
int n;
int r = 0;
int rlen2 = 0;
int rlent;
int save_appl;
save_appl = current_appl_type;
for (n = 0, rlent = 0; n < len; n+=rlen2, rlent+=rlen2) {
r = trval2(fp, enc+n, len-n, lev, &rlen2);
current_appl_type = save_appl;
if (r != OK) return(r);
}
if (rlent != len) {
fprintf(fp, "inconsistent constructed lengths (%d != %d)\n",
rlent, len);
return(NOTOK);
}
*rlen = rlent;
return(r);
}
struct typestring_table {
int k1, k2;
char *str;
int new_appl;
};
static char *lookup_typestring(table, key1, key2)
struct typestring_table *table;
int key1, key2;
{
struct typestring_table *ent;
for (ent = table; ent->k1 > 0; ent++) {
if ((ent->k1 == key1) &&
(ent->k2 == key2)) {
if (ent->new_appl)
current_appl_type = ent->new_appl;
return ent->str;
}
}
return 0;
}
struct typestring_table univ_types[] = {
{ PRIM_BOOL, -1, "Boolean"},
{ PRIM_INT, -1, "Integer"},
{ PRIM_BITS, -1, "Bit String"},
{ PRIM_OCTS, -1, "Octet String"},
{ PRIM_NULL, -1, "Null"},
{ PRIM_OID, -1, "Object Identifier"},
{ PRIM_ODE, -1, "Object Descriptor"},
{ CONS_EXTN, -1, "External"},
{ PRIM_REAL, -1, "Real"},
{ PRIM_ENUM, -1, "Enumerated type"},
{ PRIM_ENCR, -1, "Encrypted"},
{ CONS_SEQ, -1, "Sequence/Sequence Of"},
{ CONS_SET, -1, "Set/Set Of"},
{ DEFN_NUMS, -1, "Numeric String"},
{ DEFN_PRTS, -1, "Printable String"},
{ DEFN_T61S, -1, "T.61 String"},
{ DEFN_VTXS, -1, "Videotex String"},
{ DEFN_IA5S, -1, "IA5 String"},
{ DEFN_UTCT, -1, "UTCTime"},
{ DEFN_GENT, -1, "Generalized Time"},
{ DEFN_GFXS, -1, "Graphics string (ISO2375)"},
{ DEFN_VISS, -1, "Visible string"},
{ DEFN_GENS, -1, "General string"},
{ DEFN_CHRS, -1, "Character string"},
{ -1, -1, 0}
};
#ifdef KRB5
struct typestring_table krb5_types[] = {
{ 1, -1, "Krb5 Ticket"},
{ 2, -1, "Krb5 Authenticator"},
{ 3, -1, "Krb5 Encrypted ticket part"},
{ 10, -1, "Krb5 AS-REQ packet"},
{ 11, -1, "Krb5 AS-REP packet"},
{ 12, -1, "Krb5 TGS-REQ packet"},
{ 13, -1, "Krb5 TGS-REP packet"},
{ 14, -1, "Krb5 AP-REQ packet"},
{ 15, -1, "Krb5 AP-REP packet"},
{ 20, -1, "Krb5 SAFE packet"},
{ 21, -1, "Krb5 PRIV packet"},
{ 22, -1, "Krb5 CRED packet"},
{ 30, -1, "Krb5 ERROR packet"},
{ 25, -1, "Krb5 Encrypted AS-REP part"},
{ 26, -1, "Krb5 Encrypted TGS-REP part"},
{ 27, -1, "Krb5 Encrypted AP-REP part"},
{ 28, -1, "Krb5 Encrypted PRIV part"},
{ 29, -1, "Krb5 Encrypted CRED part"},
{ -1, -1, 0}
};
struct typestring_table krb5_fields[] = {
{ 1000, 0, "name-type"}, /* PrincipalName */
{ 1000, 1, "name-string"},
{ 1001, 0, "etype"}, /* Encrypted data */
{ 1001, 1, "kvno"},
{ 1001, 2, "cipher"},
{ 1002, 0, "addr-type"}, /* HostAddress */
{ 1002, 1, "address"},
{ 1003, 0, "addr-type"}, /* HostAddresses */
{ 1003, 1, "address"},
{ 1004, 0, "ad-type"}, /* AuthorizationData */
{ 1004, 1, "ad-data"},
{ 1005, 0, "keytype"}, /* EncryptionKey */
{ 1005, 1, "keyvalue"},
{ 1006, 0, "cksumtype"}, /* Checksum */
{ 1006, 1, "checksum"},
{ 1007, 0, "kdc-options"}, /* KDC-REQ-BODY */
{ 1007, 1, "cname", 1000},
{ 1007, 2, "realm"},
{ 1007, 3, "sname", 1000},
{ 1007, 4, "from"},
{ 1007, 5, "till"},
{ 1007, 6, "rtime"},
{ 1007, 7, "nonce"},
{ 1007, 8, "etype"},
{ 1007, 9, "addresses", 1003},
{ 1007, 10, "enc-authorization-data", 1001},
{ 1007, 11, "additional-tickets"},
{ 1008, 1, "padata-type"}, /* PA-DATA */
{ 1008, 2, "pa-data"},
{ 1009, 0, "user-data"}, /* KRB-SAFE-BODY */
{ 1009, 1, "timestamp"},
{ 1009, 2, "usec"},
{ 1009, 3, "seq-number"},
{ 1009, 4, "s-address", 1002},
{ 1009, 5, "r-address", 1002},
{ 1010, 0, "lr-type"}, /* LastReq */
{ 1010, 1, "lr-value"},
{ 1011, 0, "key", 1005}, /* KRB-CRED-INFO */
{ 1011, 1, "prealm"},
{ 1011, 2, "pname", 1000},
{ 1011, 3, "flags"},
{ 1011, 4, "authtime"},
{ 1011, 5, "startime"},
{ 1011, 6, "endtime"},
{ 1011, 7, "renew-till"},
{ 1011, 8, "srealm"},
{ 1011, 9, "sname", 1000},
{ 1011, 10, "caddr", 1002},
{ 1, 0, "tkt-vno"}, /* Ticket */
{ 1, 1, "realm"},
{ 1, 2, "sname", 1000},
{ 1, 3, "tkt-enc-part", 1001},
{ 2, 0, "authenticator-vno"}, /* Authenticator */
{ 2, 1, "crealm"},
{ 2, 2, "cname", 1000},
{ 2, 3, "cksum", 1006},
{ 2, 4, "cusec"},
{ 2, 5, "ctime"},
{ 2, 6, "subkey", 1005},
{ 2, 7, "seq-number"},
{ 2, 8, "authorization-data", 1004},
{ 3, 0, "flags"}, /* EncTicketPart */
{ 3, 1, "key", 1005},
{ 3, 2, "crealm"},
{ 3, 3, "cname", 1000},
{ 3, 4, "transited"},
{ 3, 5, "authtime"},
{ 3, 6, "starttime"},
{ 3, 7, "endtime"},
{ 3, 8, "renew-till"},
{ 3, 9, "caddr", 1003},
{ 3, 10, "authorization-data", 1004},
{ 10, 1, "pvno"}, /* AS-REQ */
{ 10, 2, "msg-type"},
{ 10, 3, "padata", 1008},
{ 10, 4, "req-body", 1007},
{ 11, 0, "pvno"}, /* AS-REP */
{ 11, 1, "msg-type"},
{ 11, 2, "padata", 1008},
{ 11, 3, "crealm"},
{ 11, 4, "cname", 1000},
{ 11, 5, "ticket"},
{ 11, 6, "enc-part", 1001},
{ 12, 1, "pvno"}, /* TGS-REQ */
{ 12, 2, "msg-type"},
{ 12, 3, "padata", 1008},
{ 12, 4, "req-body", 1007},
{ 13, 0, "pvno"}, /* TGS-REP */
{ 13, 1, "msg-type"},
{ 13, 2, "padata", 1008},
{ 13, 3, "crealm"},
{ 13, 4, "cname", 1000},
{ 13, 5, "ticket"},
{ 13, 6, "enc-part", 1001},
{ 14, 0, "pvno"}, /* AP-REQ */
{ 14, 1, "msg-type"},
{ 14, 2, "ap-options"},
{ 14, 3, "ticket"},
{ 14, 4, "authenticator", 1001},
{ 15, 0, "pvno"}, /* AP-REP */
{ 15, 1, "msg-type"},
{ 15, 2, "enc-part", 1001},
{ 20, 0, "pvno"}, /* KRB-SAFE */
{ 20, 1, "msg-type"},
{ 20, 2, "safe-body", 1009},
{ 20, 3, "cksum", 1006},
{ 21, 0, "pvno"}, /* KRB-PRIV */
{ 21, 1, "msg-type"},
{ 21, 2, "enc-part", 1001},
{ 22, 0, "pvno"}, /* KRB-CRED */
{ 22, 1, "msg-type"},
{ 22, 2, "tickets"},
{ 22, 3, "enc-part", 1001},
{ 25, 0, "key", 1005}, /* EncASRepPart */
{ 25, 1, "last-req", 1010},
{ 25, 2, "nonce"},
{ 25, 3, "key-expiration"},
{ 25, 4, "flags"},
{ 25, 5, "authtime"},
{ 25, 6, "starttime"},
{ 25, 7, "enddtime"},
{ 25, 8, "renew-till"},
{ 25, 9, "srealm"},
{ 25, 10, "sname", 1000},
{ 25, 11, "caddr", 1003},
{ 26, 0, "key", 1005}, /* EncTGSRepPart */
{ 26, 1, "last-req", 1010},
{ 26, 2, "nonce"},
{ 26, 3, "key-expiration"},
{ 26, 4, "flags"},
{ 26, 5, "authtime"},
{ 26, 6, "starttime"},
{ 26, 7, "enddtime"},
{ 26, 8, "renew-till"},
{ 26, 9, "srealm"},
{ 26, 10, "sname", 1000},
{ 26, 11, "caddr", 1003},
{ 27, 0, "ctime"}, /* EncApRepPart */
{ 27, 1, "cusec"},
{ 27, 2, "subkey", 1005},
{ 27, 3, "seq-number"},
{ 28, 0, "user-data"}, /* EncKrbPrivPart */
{ 28, 1, "timestamp"},
{ 28, 2, "usec"},
{ 28, 3, "seq-number"},
{ 28, 4, "s-address", 1002},
{ 28, 5, "r-address", 1002},
{ 29, 0, "ticket-info", 1011}, /* EncKrbCredPart */
{ 29, 1, "nonce"},
{ 29, 2, "timestamp"},
{ 29, 3, "usec"},
{ 29, 4, "s-address", 1002},
{ 29, 5, "r-address", 1002},
{ 30, 0, "pvno"}, /* KRB-ERROR */
{ 30, 1, "msg-type"},
{ 30, 2, "ctime"},
{ 30, 3, "cusec"},
{ 30, 4, "stime"},
{ 30, 5, "susec"},
{ 30, 6, "error-code"},
{ 30, 7, "crealm"},
{ 30, 8, "cname", 1000},
{ 30, 9, "realm"},
{ 30, 10, "sname", 1000},
{ 30, 11, "e-text"},
{ 30, 12, "e-data"},
{ -1, -1, 0}
};
#endif
void print_tag_type(fp, eid, lev)
FILE *fp;
int eid;
int lev;
{
int tag = eid & ID_TAG;
int do_space = 1;
char *str;
fprintf(fp, "[");
switch(eid & ID_CLASS) {
case CLASS_UNIV:
if (print_types && print_skip_tagnum)
do_space = 0;
else
fprintf(fp, "UNIV %d", tag);
break;
case CLASS_APPL:
current_appl_type = tag;
#ifdef KRB5
if (print_krb5_types) {
str = lookup_typestring(krb5_types, tag, -1);
if (str) {
fputs(str, fp);
break;
}
}
#endif
fprintf(fp, "APPL %d", tag);
break;
case CLASS_CONT:
#ifdef KRB5
if (print_krb5_types && current_appl_type) {
str = lookup_typestring(krb5_fields,
current_appl_type, tag);
if (str) {
fputs(str, fp);
break;
}
}
#endif
if (print_skip_context && lev)
fprintf(fp, "%d", tag);
else
fprintf(fp, "CONT %d", tag);
break;
case CLASS_PRIV:
fprintf(fp, "PRIV %d", tag);
break;
}
if (print_types && ((eid & ID_CLASS) == CLASS_UNIV)) {
if (do_space)
fputs(" ", fp);
str = lookup_typestring(univ_types, eid & ID_TAG, -1);
if (str)
fputs(str, fp);
else
fprintf(fp, "UNIV %d???", eid & ID_TAG);
}
fprintf(fp, "]");
}
/*****************************************************************************/
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