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deltachat-core/libs/cyrussasl/lib/saslutil.c

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/* saslutil.c
* Rob Siemborski
* Tim Martin
* $Id: saslutil.c,v 1.52 2011/09/22 14:43:01 mel Exp $
*/
/*
* Copyright (c) 1998-2003 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any other legal
* details, please contact
* Office of Technology Transfer
* Carnegie Mellon University
* 5000 Forbes Avenue
* Pittsburgh, PA 15213-3890
* (412) 268-4387, fax: (412) 268-7395
* tech-transfer@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <config.h>
#include <stdio.h>
#if defined(WIN32)
#define _CRT_RAND_S
#endif
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#include "saslint.h"
#include <saslutil.h>
/* Contains:
*
* sasl_decode64
* sasl_encode64
* sasl_mkchal
* sasl_utf8verify
* sasl_randcreate
* sasl_randfree
* sasl_randseed
* sasl_rand
* sasl_churn
* sasl_erasebuffer
*/
#ifdef sun
/* gotta define gethostname ourselves on suns */
extern int gethostname(char *, int);
#endif
char *encode_table;
char *decode_table;
#define RPOOL_SIZE 3
struct sasl_rand_s {
unsigned short pool[RPOOL_SIZE];
/* since the init time might be really bad let's make this lazy */
int initialized;
};
#define CHAR64(c) (((c) < 0 || (c) > 127) ? -1 : index_64[(c)])
static char basis_64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????";
static char index_64[128] = {
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14,
15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
-1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
};
/* base64 encode
* in -- input data
* inlen -- input data length
* out -- output buffer (will be NUL terminated)
* outmax -- max size of output buffer
* result:
* outlen -- gets actual length of output buffer (optional)
*
* Returns SASL_OK on success, SASL_BUFOVER if result won't fit
*/
int sasl_encode64(const char *_in,
unsigned inlen,
char *_out,
unsigned outmax,
unsigned *outlen)
{
const unsigned char *in = (const unsigned char *)_in;
unsigned char *out = (unsigned char *)_out;
unsigned char oval;
char *blah;
unsigned olen;
/* check params */
if ((inlen > 0) && (in == NULL)) return SASL_BADPARAM;
/* Will it fit? */
olen = (inlen + 2) / 3 * 4;
if (outlen) {
*outlen = olen;
}
if (outmax <= olen) {
return SASL_BUFOVER;
}
/* Do the work... */
blah = (char *) out;
while (inlen >= 3) {
/* user provided max buffer size; make sure we don't go over it */
*out++ = basis_64[in[0] >> 2];
*out++ = basis_64[((in[0] << 4) & 0x30) | (in[1] >> 4)];
*out++ = basis_64[((in[1] << 2) & 0x3c) | (in[2] >> 6)];
*out++ = basis_64[in[2] & 0x3f];
in += 3;
inlen -= 3;
}
if (inlen > 0) {
/* user provided max buffer size; make sure we don't go over it */
*out++ = basis_64[in[0] >> 2];
oval = (in[0] << 4) & 0x30;
if (inlen > 1) oval |= in[1] >> 4;
*out++ = basis_64[oval];
*out++ = (inlen < 2) ? '=' : basis_64[(in[1] << 2) & 0x3c];
*out++ = '=';
}
*out = '\0';
return SASL_OK;
}
/* base64 decode
* in -- input data
* inlen -- length of input data
* out -- output data (may be same as in, must have enough space)
* outmax -- max size of output buffer
* result:
* outlen -- actual output length
*
* returns:
* SASL_BADPROT on bad base64,
* SASL_BUFOVER if result won't fit,
* SASL_CONTINUE on a partial block,
* SASL_OK on success
*/
int sasl_decode64(const char *in,
unsigned inlen,
char *out,
unsigned outmax, /* size of the buffer, not counting the NUL */
unsigned *outlen)
{
unsigned len = 0;
unsigned j;
int c[4];
int saw_equal = 0;
/* check parameters */
if (out == NULL) return SASL_FAIL;
if (inlen > 0 && *in == '\r') return SASL_FAIL;
while (inlen > 3) {
/* No data is valid after an '=' character */
if (saw_equal) {
return SASL_BADPROT;
}
for (j = 0; j < 4; j++) {
c[j] = in[0];
in++;
inlen--;
}
if (CHAR64(c[0]) == -1 || CHAR64(c[1]) == -1) return SASL_BADPROT;
if (c[2] != '=' && CHAR64(c[2]) == -1) return SASL_BADPROT;
if (c[3] != '=' && CHAR64(c[3]) == -1) return SASL_BADPROT;
/* No data is valid after a '=' character, unless it is another '=' */
if (c[2] == '=' && c[3] != '=') return SASL_BADPROT;
if (c[2] == '=' || c[3] == '=') {
saw_equal = 1;
}
*out++ = (CHAR64(c[0]) << 2) | (CHAR64(c[1]) >> 4);
if (++len >= outmax) return SASL_BUFOVER;
if (c[2] != '=') {
*out++ = ((CHAR64(c[1]) << 4) & 0xf0) | (CHAR64(c[2]) >> 2);
if (++len >= outmax) return SASL_BUFOVER;
if (c[3] != '=') {
*out++ = ((CHAR64(c[2]) << 6) & 0xc0) | CHAR64(c[3]);
if (++len >= outmax) return SASL_BUFOVER;
}
}
}
*out = '\0'; /* NUL terminate the output string */
if (outlen) *outlen = len;
if (inlen != 0) {
if (saw_equal) {
/* Unless there is CRLF at the end? */
return SASL_BADPROT;
} else {
return (SASL_CONTINUE);
}
}
return SASL_OK;
}
/* make a challenge string (NUL terminated)
* buf -- buffer for result
* maxlen -- max length of result
* hostflag -- 0 = don't include hostname, 1 = include hostname
* returns final length or 0 if not enough space
*/
int sasl_mkchal(sasl_conn_t *conn,
char *buf,
unsigned maxlen,
unsigned hostflag)
{
sasl_rand_t *pool = NULL;
unsigned long randnum;
int ret;
time_t now;
unsigned len;
len = 4 /* <.>\0 */
+ (2 * 20); /* 2 numbers, 20 => max size of 64bit
* ulong in base 10 */
if (hostflag && conn->serverFQDN)
len += (unsigned) strlen(conn->serverFQDN) + 1 /* for the @ */;
if (maxlen < len)
return 0;
ret = sasl_randcreate(&pool);
if(ret != SASL_OK) return 0; /* xxx sasl return code? */
sasl_rand(pool, (char *)&randnum, sizeof(randnum));
sasl_randfree(&pool);
time(&now);
if (hostflag && conn->serverFQDN)
snprintf(buf,maxlen, "<%lu.%lu@%s>", randnum, now, conn->serverFQDN);
else
snprintf(buf,maxlen, "<%lu.%lu>", randnum, now);
return (int) strlen(buf);
}
/* borrowed from larry. probably works :)
* probably is also in acap server somewhere
*/
int sasl_utf8verify(const char *str, unsigned len)
{
unsigned i;
for (i = 0; i < len; i++) {
/* how many octets? */
int seqlen = 0;
while (str[i] & (0x80 >> seqlen)) ++seqlen;
if (seqlen == 0) continue; /* this is a valid US-ASCII char */
if (seqlen == 1) return SASL_BADPROT; /* this shouldn't happen here */
if (seqlen > 6) return SASL_BADPROT; /* illegal */
while (--seqlen)
if ((str[++i] & 0xC0) != 0xF0) return SASL_BADPROT; /* needed a 10 octet */
}
return SASL_OK;
}
/*
* To see why this is really bad see RFC 1750
*
* unfortunatly there currently is no way to make
* cryptographically secure pseudo random numbers
* without specialized hardware etc...
* thus, this is for nonce use only
*/
void getranddata(unsigned short ret[RPOOL_SIZE])
{
long curtime;
memset(ret, 0, RPOOL_SIZE*sizeof(unsigned short));
#ifdef DEV_RANDOM
{
int fd;
fd = open(DEV_RANDOM, O_RDONLY);
if(fd != -1) {
unsigned char *buf = (unsigned char *)ret;
ssize_t bytesread = 0;
size_t bytesleft = RPOOL_SIZE*sizeof(unsigned short);
do {
bytesread = read(fd, buf, bytesleft);
if(bytesread == -1 && errno == EINTR) continue;
else if(bytesread <= 0) break;
bytesleft -= bytesread;
buf += bytesread;
} while(bytesleft != 0);
close(fd);
}
}
#endif
#ifdef HAVE_GETPID
ret[0] ^= (unsigned short) getpid();
#endif
#ifdef HAVE_GETTIMEOFDAY
{
struct timeval tv;
/* xxx autoconf macro */
#ifdef _SVID_GETTOD
if (!gettimeofday(&tv))
#else
if (!gettimeofday(&tv, NULL))
#endif
{
/* longs are guaranteed to be at least 32 bits; we need
16 bits in each short */
ret[0] ^= (unsigned short) (tv.tv_sec & 0xFFFF);
ret[1] ^= (unsigned short) (clock() & 0xFFFF);
ret[1] ^= (unsigned short) (tv.tv_usec >> 16);
ret[2] ^= (unsigned short) (tv.tv_usec & 0xFFFF);
return;
}
}
#endif /* HAVE_GETTIMEOFDAY */
/* if all else fails just use time() */
curtime = (long) time(NULL); /* better be at least 32 bits */
ret[0] ^= (unsigned short) (curtime >> 16);
ret[1] ^= (unsigned short) (curtime & 0xFFFF);
ret[2] ^= (unsigned short) (clock() & 0xFFFF);
return;
}
int sasl_randcreate(sasl_rand_t **rpool)
{
(*rpool)=sasl_ALLOC(sizeof(sasl_rand_t));
if ((*rpool) == NULL) return SASL_NOMEM;
/* init is lazy */
(*rpool)->initialized = 0;
return SASL_OK;
}
void sasl_randfree(sasl_rand_t **rpool)
{
sasl_FREE(*rpool);
}
void sasl_randseed (sasl_rand_t *rpool, const char *seed, unsigned len)
{
/* is it acceptable to just use the 1st 3 char's given??? */
unsigned int lup;
/* check params */
if (seed == NULL) return;
if (rpool == NULL) return;
rpool->initialized = 1;
if (len > sizeof(unsigned short)*RPOOL_SIZE)
len = sizeof(unsigned short)*RPOOL_SIZE;
for (lup = 0; lup < len; lup += 2)
rpool->pool[lup/2] = (seed[lup] << 8) + seed[lup + 1];
}
static void randinit(sasl_rand_t *rpool)
{
if (!rpool) return;
if (!rpool->initialized) {
getranddata(rpool->pool);
rpool->initialized = 1;
#if !(defined(WIN32)||defined(macintosh))
#ifndef HAVE_JRAND48
{
/* xxx varies by platform */
unsigned int *foo = (unsigned int *)rpool->pool;
srandom(*foo);
}
#endif /* HAVE_JRAND48 */
#elif defined(WIN32)
{
unsigned int *foo = (unsigned int *)rpool->pool;
srand(*foo);
}
#endif /* WIN32 */
}
}
void sasl_rand (sasl_rand_t *rpool, char *buf, unsigned len)
{
unsigned int lup;
#if defined(WIN32) && !defined(__MINGW32__)
unsigned int randomValue;
#endif
/* check params */
if (!rpool || !buf) return;
/* init if necessary */
randinit(rpool);
for (lup = 0; lup < len; lup++) {
#if defined(__MINGW32__)
buf[lup] = (char) (rand() >> 8);
#elif defined(WIN32)
if (rand_s(&randomValue) != 0) {
randomValue = rand();
}
buf[lup] = (char) (randomValue >> 8);
#elif defined(macintosh)
buf[lup] = (char) (rand() >> 8);
#else /* !WIN32 && !macintosh */
#ifdef HAVE_JRAND48
buf[lup] = (char) (jrand48(rpool->pool) >> 8);
#else
buf[lup] = (char) (random() >> 8);
#endif /* HAVE_JRAND48 */
#endif /* WIN32 */
}
}
/* this function is just a bad idea all around, since we're not trying to
implement a true random number generator */
void sasl_churn (sasl_rand_t *rpool, const char *data, unsigned len)
{
unsigned int lup;
/* check params */
if (!rpool || !data) return;
/* init if necessary */
randinit(rpool);
for (lup=0; lup<len; lup++)
rpool->pool[lup % RPOOL_SIZE] ^= data[lup];
}
void sasl_erasebuffer(char *buf, unsigned len) {
memset(buf, 0, len);
}
/* Lowercase string in place */
char *sasl_strlower (
char *val
)
{
int i;
if (val == NULL) {
return (NULL);
}
/* don't use tolower(), as it is locale dependent */
for (i = 0; val[i] != '\0'; i++) {
if (val[i] >= 'A' && val[i] <= 'Z') {
val[i] = val[i] - 'A' + 'a';
}
}
return (val);
}
/* A version of gethostname that tries hard to return a FQDN */
int get_fqhostname(
char *name,
int namelen,
int abort_if_no_fqdn
)
{
int return_value;
struct addrinfo hints;
struct addrinfo *result;
return_value = gethostname (name, namelen);
if (return_value != 0) {
return (return_value);
}
if (strchr (name, '.') != NULL) {
goto LOWERCASE;
}
/* gethostname hasn't returned a FQDN, we have to canonify it ourselves */
hints.ai_family = PF_UNSPEC;
hints.ai_flags = AI_CANONNAME;
hints.ai_socktype = SOCK_STREAM; /* TCP only */
/* A value of zero for ai_protocol indicates the caller will accept any protocol. or IPPROTO_TCP? */
hints.ai_protocol = 0; /* 0 or IPPROTO_xxx for IPv4 and IPv6 */
hints.ai_addrlen = 0;
hints.ai_canonname = NULL;
hints.ai_addr = NULL;
hints.ai_next = NULL;
if (getaddrinfo(name,
NULL, /* don't care abour service/port */
&hints,
&result) != 0) {
if (abort_if_no_fqdn) {
/* errno on Unix, WSASetLastError on Windows are already done by the function */
return (-1);
} else {
goto LOWERCASE;
}
}
if (result == NULL || result->ai_canonname == NULL) {
freeaddrinfo (result);
if (abort_if_no_fqdn) {
#ifdef WIN32
WSASetLastError (WSANO_DATA);
#elif defined(ENODATA)
errno = ENODATA;
#elif defined(EADDRNOTAVAIL)
errno = EADDRNOTAVAIL;
#endif
return (-1);
} else {
goto LOWERCASE;
}
}
if (strchr (result->ai_canonname, '.') == NULL) {
freeaddrinfo (result);
if (abort_if_no_fqdn) {
#ifdef WIN32
WSASetLastError (WSANO_DATA);
#elif defined(ENODATA)
errno = ENODATA;
#elif defined(EADDRNOTAVAIL)
errno = EADDRNOTAVAIL;
#endif
return (-1);
} else {
goto LOWERCASE;
}
}
/* Do we need to check for buffer overflow and set errno? */
strncpy (name, result->ai_canonname, namelen);
freeaddrinfo (result);
LOWERCASE:
sasl_strlower (name);
return (0);
}
#ifdef WIN32
/*****************************************************************************
*
* MODULE NAME : GETOPT.C
*
* COPYRIGHTS:
* This module contains code made available by IBM
* Corporation on an AS IS basis. Any one receiving the
* module is considered to be licensed under IBM copyrights
* to use the IBM-provided source code in any way he or she
* deems fit, including copying it, compiling it, modifying
* it, and redistributing it, with or without
* modifications. No license under any IBM patents or
* patent applications is to be implied from this copyright
* license.
*
* A user of the module should understand that IBM cannot
* provide technical support for the module and will not be
* responsible for any consequences of use of the program.
*
* Any notices, including this one, are not to be removed
* from the module without the prior written consent of
* IBM.
*
* AUTHOR: Original author:
* G. R. Blair (BOBBLAIR at AUSVM1)
* Internet: bobblair@bobblair.austin.ibm.com
*
* Extensively revised by:
* John Q. Walker II, Ph.D. (JOHHQ at RALVM6)
* Internet: johnq@ralvm6.vnet.ibm.com
*
*****************************************************************************/
/******************************************************************************
* getopt()
*
* The getopt() function is a command line parser. It returns the next
* option character in argv that matches an option character in opstring.
*
* The argv argument points to an array of argc+1 elements containing argc
* pointers to character strings followed by a null pointer.
*
* The opstring argument points to a string of option characters; if an
* option character is followed by a colon, the option is expected to have
* an argument that may or may not be separated from it by white space.
* The external variable optarg is set to point to the start of the option
* argument on return from getopt().
*
* The getopt() function places in optind the argv index of the next argument
* to be processed. The system initializes the external variable optind to
* 1 before the first call to getopt().
*
* When all options have been processed (that is, up to the first nonoption
* argument), getopt() returns EOF. The special option "--" may be used to
* delimit the end of the options; EOF will be returned, and "--" will be
* skipped.
*
* The getopt() function returns a question mark (?) when it encounters an
* option character not included in opstring. This error message can be
* disabled by setting opterr to zero. Otherwise, it returns the option
* character that was detected.
*
* If the special option "--" is detected, or all options have been
* processed, EOF is returned.
*
* Options are marked by either a minus sign (-) or a slash (/).
*
* No errors are defined.
*****************************************************************************/
#include <string.h> /* for strchr() */
/* static (global) variables that are specified as exported by getopt() */
__declspec(dllexport) char *optarg = NULL; /* pointer to the start of the option argument */
__declspec(dllexport) int optind = 1; /* number of the next argv[] to be evaluated */
__declspec(dllexport) int opterr = 1; /* non-zero if a question mark should be returned */
/* handle possible future character set concerns by putting this in a macro */
#define _next_char(string) (char)(*(string+1))
int getopt(int argc, char *argv[], char *opstring)
{
static char *pIndexPosition = NULL; /* place inside current argv string */
char *pArgString = NULL; /* where to start from next */
char *pOptString; /* the string in our program */
if (pIndexPosition != NULL) {
/* we last left off inside an argv string */
if (*(++pIndexPosition)) {
/* there is more to come in the most recent argv */
pArgString = pIndexPosition;
}
}
if (pArgString == NULL) {
/* we didn't leave off in the middle of an argv string */
if (optind >= argc) {
/* more command-line arguments than the argument count */
pIndexPosition = NULL; /* not in the middle of anything */
return EOF; /* used up all command-line arguments */
}
/*---------------------------------------------------------------------
* If the next argv[] is not an option, there can be no more options.
*-------------------------------------------------------------------*/
pArgString = argv[optind++]; /* set this to the next argument ptr */
if (('/' != *pArgString) && /* doesn't start with a slash or a dash? */
('-' != *pArgString)) {
--optind; /* point to current arg once we're done */
optarg = NULL; /* no argument follows the option */
pIndexPosition = NULL; /* not in the middle of anything */
return EOF; /* used up all the command-line flags */
}
/* check for special end-of-flags markers */
if ((strcmp(pArgString, "-") == 0) ||
(strcmp(pArgString, "--") == 0)) {
optarg = NULL; /* no argument follows the option */
pIndexPosition = NULL; /* not in the middle of anything */
return EOF; /* encountered the special flag */
}
pArgString++; /* look past the / or - */
}
if (':' == *pArgString) { /* is it a colon? */
/*---------------------------------------------------------------------
* Rare case: if opterr is non-zero, return a question mark;
* otherwise, just return the colon we're on.
*-------------------------------------------------------------------*/
return (opterr ? (int)'?' : (int)':');
}
else if ((pOptString = strchr(opstring, *pArgString)) == 0) {
/*---------------------------------------------------------------------
* The letter on the command-line wasn't any good.
*-------------------------------------------------------------------*/
optarg = NULL; /* no argument follows the option */
pIndexPosition = NULL; /* not in the middle of anything */
return (opterr ? (int)'?' : (int)*pArgString);
}
else {
/*---------------------------------------------------------------------
* The letter on the command-line matches one we expect to see
*-------------------------------------------------------------------*/
if (':' == _next_char(pOptString)) { /* is the next letter a colon? */
/* It is a colon. Look for an argument string. */
if ('\0' != _next_char(pArgString)) { /* argument in this argv? */
optarg = &pArgString[1]; /* Yes, it is */
}
else {
/*-------------------------------------------------------------
* The argument string must be in the next argv.
* But, what if there is none (bad input from the user)?
* In that case, return the letter, and optarg as NULL.
*-----------------------------------------------------------*/
if (optind < argc)
optarg = argv[optind++];
else {
optarg = NULL;
return (opterr ? (int)'?' : (int)*pArgString);
}
}
pIndexPosition = NULL; /* not in the middle of anything */
}
else {
/* it's not a colon, so just return the letter */
optarg = NULL; /* no argument follows the option */
pIndexPosition = pArgString; /* point to the letter we're on */
}
return (int)*pArgString; /* return the letter that matched */
}
}
#ifndef PASSWORD_MAX
# define PASSWORD_MAX 255
#endif
#include <conio.h>
char *
getpass(prompt)
const char *prompt;
{
register char *p;
register int c;
static char pbuf[PASSWORD_MAX];
fprintf(stderr, "%s", prompt); (void) fflush(stderr);
for (p=pbuf; (c = _getch())!=13 && c!=EOF;) {
if (p < &pbuf[sizeof(pbuf)-1])
*p++ = (char) c;
}
*p = '\0';
fprintf(stderr, "\n"); (void) fflush(stderr);
return(pbuf);
}
#endif /* WIN32 */
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