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gnupg/sm/base64.c

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/* base64.c
* Copyright (C) 2001 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <assert.h>
#include <ksba.h>
#include "gpgsm.h"
#include "i18n.h"
#ifdef HAVE_DOSISH_SYSTEM
#define LF "\r\n"
#else
#define LF "\n"
#endif
/* data used by the reader callbacks */
struct reader_cb_parm_s {
FILE *fp;
unsigned char line[1024];
int linelen;
int readpos;
int have_lf;
unsigned long line_counter;
int autodetect; /* try to detect the input encoding */
int assume_pem; /* assume input encoding is PEM */
int assume_base64; /* assume input is base64 encoded */
int identified;
int is_pem;
int is_base64;
int stop_seen;
int might_be_smime;
struct {
int idx;
unsigned char val;
int stop_seen;
} base64;
};
/* data used by the writer callbacks */
struct writer_cb_parm_s {
FILE *fp;
const char *pem_name;
int wrote_begin;
int did_finish;
struct {
int idx;
int quad_count;
unsigned char radbuf[4];
} base64;
};
/* context for this module's functions */
struct base64_context_s {
union {
struct reader_cb_parm_s rparm;
struct writer_cb_parm_s wparm;
} u;
};
/* The base-64 character list */
static unsigned char bintoasc[64] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
/* The reverse base-64 list */
static unsigned char asctobin[256] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12,
0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24,
0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff
};
static int
has_only_base64 (const unsigned char *line, int linelen)
{
if (linelen < 20)
return 0;
for (; linelen; line++, linelen--)
{
if (*line == '\n' || (linelen > 1 && *line == '\r' && line[1] == '\n'))
break;
if ( !strchr (bintoasc, *line) )
return 0;
}
return 1; /* yes */
}
static int
is_empty_line (const unsigned char *line, int linelen)
{
if (linelen >= 2 && *line == '\r' && line[1] == '\n')
return 1;
if (linelen >= 1 && *line == '\n')
return 1;
return 0;
}
static int
base64_reader_cb (void *cb_value, char *buffer, size_t count, size_t *nread)
{
struct reader_cb_parm_s *parm = cb_value;
size_t n;
int c, c2;
*nread = 0;
if (!buffer)
return -1; /* not supported */
next:
if (!parm->linelen)
{
/* read an entire line or up to the size of the buffer */
parm->line_counter++;
parm->have_lf = 0;
for (n=0; n < DIM(parm->line);)
{
c = getc (parm->fp);
if (c == EOF)
{
if (ferror (parm->fp))
return -1;
break;
}
parm->line[n++] = c;
if (c == '\n')
{
parm->have_lf = 1;
/* Fixme: we need to skip overlong lines while detecting
the dashed lines */
break;
}
}
parm->linelen = n;
if (!n)
return -1; /* eof */
parm->readpos = 0;
}
if (!parm->identified)
{
if (!parm->autodetect)
{
if (parm->assume_pem)
{
/* wait for the header line */
parm->linelen = parm->readpos = 0;
if (!parm->have_lf || strncmp (parm->line, "-----BEGIN ", 11)
|| !strncmp (parm->line+11, "PGP ", 4))
goto next;
parm->is_pem = 1;
}
else if (parm->assume_base64)
parm->is_base64 = 1;
}
else if (parm->line_counter == 1 && !parm->have_lf)
{
/* first line too long - assume DER encoding */
parm->is_pem = 0;
}
else if (parm->line_counter == 1 && parm->linelen && *parm->line == 0x30)
{
/* the very first byte does pretty much look like a SEQUENCE tag*/
parm->is_pem = 0;
}
else if ( parm->have_lf && !strncmp (parm->line, "-----BEGIN ", 11)
&& strncmp (parm->line+11, "PGP ", 4) )
{
/* Fixme: we must only compare if the line really starts at
the beginning */
parm->is_pem = 1;
parm->linelen = parm->readpos = 0;
}
else if ( parm->have_lf && parm->line_counter == 1
&& parm->linelen >= 13
&& !ascii_memcasecmp (parm->line, "Content-Type:", 13))
{ /* might be a S/MIME body */
parm->might_be_smime = 1;
parm->linelen = parm->readpos = 0;
goto next;
}
else if (parm->might_be_smime == 1
&& is_empty_line (parm->line, parm->linelen))
{
parm->might_be_smime = 2;
parm->linelen = parm->readpos = 0;
goto next;
}
else if (parm->might_be_smime == 2)
{
parm->might_be_smime = 0;
if ( !has_only_base64 (parm->line, parm->linelen))
{
parm->linelen = parm->readpos = 0;
goto next;
}
parm->is_pem = 1;
}
else
{
parm->linelen = parm->readpos = 0;
goto next;
}
parm->identified = 1;
parm->base64.stop_seen = 0;
parm->base64.idx = 0;
}
n = 0;
if (parm->is_pem || parm->is_base64)
{
if (parm->is_pem && parm->have_lf
&& !strncmp (parm->line, "-----END ", 9))
{
parm->identified = 0;
parm->linelen = parm->readpos = 0;
/* let us return 0 */
}
else if (parm->stop_seen)
{ /* skip the rest of the line */
parm->linelen = parm->readpos = 0;
}
else
{
int idx = parm->base64.idx;
unsigned char val = parm->base64.val;
while (n < count && parm->readpos < parm->linelen )
{
c = parm->line[parm->readpos++];
if (c == '\n' || c == ' ' || c == '\r' || c == '\t')
continue;
if (c == '=')
{ /* pad character: stop */
if (idx == 1)
buffer[n++] = val;
parm->stop_seen = 1;
break;
}
if( (c = asctobin[(c2=c)]) == 255 )
{
log_error (_("invalid radix64 character %02x skipped\n"),
c2);
continue;
}
switch (idx)
{
case 0:
val = c << 2;
break;
case 1:
val |= (c>>4)&3;
buffer[n++] = val;
val = (c<<4)&0xf0;
break;
case 2:
val |= (c>>2)&15;
buffer[n++] = val;
val = (c<<6)&0xc0;
break;
case 3:
val |= c&0x3f;
buffer[n++] = val;
break;
}
idx = (idx+1) % 4;
}
if (parm->readpos == parm->linelen)
parm->linelen = parm->readpos = 0;
parm->base64.idx = idx;
parm->base64.val = val;
}
}
else
{ /* DER encoded */
while (n < count && parm->readpos < parm->linelen)
buffer[n++] = parm->line[parm->readpos++];
if (parm->readpos == parm->linelen)
parm->linelen = parm->readpos = 0;
}
*nread = n;
return 0;
}
static int
simple_reader_cb (void *cb_value, char *buffer, size_t count, size_t *nread)
{
struct reader_cb_parm_s *parm = cb_value;
size_t n;
int c = 0;
*nread = 0;
if (!buffer)
return -1; /* not supported */
for (n=0; n < count; n++)
{
c = getc (parm->fp);
if (c == EOF)
{
if ( ferror (parm->fp) )
return -1;
if (n)
break; /* return what we have before an EOF */
return -1;
}
*(byte *)buffer++ = c;
}
*nread = n;
return 0;
}
static int
base64_writer_cb (void *cb_value, const void *buffer, size_t count)
{
struct writer_cb_parm_s *parm = cb_value;
unsigned char radbuf[4];
int i, c, idx, quad_count;
const unsigned char *p;
FILE *fp = parm->fp;
if (!count)
return 0;
if (!parm->wrote_begin)
{
if (parm->pem_name)
{
fputs ("-----BEGIN ", fp);
fputs (parm->pem_name, fp);
fputs ("-----\n", fp);
}
parm->wrote_begin = 1;
parm->base64.idx = 0;
parm->base64.quad_count = 0;
}
idx = parm->base64.idx;
quad_count = parm->base64.quad_count;
for (i=0; i < idx; i++)
radbuf[i] = parm->base64.radbuf[i];
for (p=buffer; count; p++, count--)
{
radbuf[idx++] = *p;
if (idx > 2)
{
idx = 0;
c = bintoasc[(*radbuf >> 2) & 077];
putc (c, fp);
c = bintoasc[(((*radbuf<<4)&060)|((radbuf[1] >> 4)&017))&077];
putc (c, fp);
c = bintoasc[(((radbuf[1]<<2)&074)|((radbuf[2]>>6)&03))&077];
putc (c, fp);
c = bintoasc[radbuf[2]&077];
putc (c, fp);
if (++quad_count >= (64/4))
{
fputs (LF, fp);
quad_count = 0;
}
}
}
for (i=0; i < idx; i++)
parm->base64.radbuf[i] = radbuf[i];
parm->base64.idx = idx;
parm->base64.quad_count = quad_count;
return ferror (fp) ? KSBA_Write_Error:0;
}
static int
base64_finish_write (struct writer_cb_parm_s *parm)
{
unsigned char radbuf[4];
int i, c, idx, quad_count;
FILE *fp = parm->fp;
if (!parm->wrote_begin)
return 0; /* nothing written */
/* flush the base64 encoding */
idx = parm->base64.idx;
quad_count = parm->base64.quad_count;
for (i=0; i < idx; i++)
radbuf[i] = parm->base64.radbuf[i];
if (idx)
{
c = bintoasc[(*radbuf>>2)&077];
putc (c, fp);
if (idx == 1)
{
c = bintoasc[((*radbuf << 4) & 060) & 077];
putc (c, fp);
putc ('=', fp);
putc ('=', fp);
}
else
{
c = bintoasc[(((*radbuf<<4)&060)|((radbuf[1]>>4)&017))&077];
putc (c, fp);
c = bintoasc[((radbuf[1] << 2) & 074) & 077];
putc (c, fp);
putc ('=', fp);
}
if (++quad_count >= (64/4))
{
fputs (LF, fp);
quad_count = 0;
}
}
if (quad_count)
fputs (LF, fp);
if (parm->pem_name)
{
fputs ("-----END ", fp);
fputs (parm->pem_name, fp);
fputs ("-----\n", fp);
}
return ferror (fp)? GNUPG_Write_Error : 0;
}
/* Create a reader for the given file descriptor. Depending on the
control information an input decoding is automagically choosen.
The function returns a Base64Context object which must be passed to
the gpgme_destroy_reader function. The created KsbaReader object
is also returned, but the caller must not call the
ksba_reader_release function on. */
int
gpgsm_create_reader (Base64Context *ctx,
CTRL ctrl, FILE *fp, KsbaReader *r_reader)
{
int rc;
KsbaReader r;
*r_reader = NULL;
*ctx = xtrycalloc (1, sizeof **ctx);
if (!*ctx)
return seterr (Out_Of_Core);
r = ksba_reader_new ();
if (!r)
{
xfree (*ctx); *ctx = NULL;
return seterr (Out_Of_Core);
}
(*ctx)->u.rparm.fp = fp;
if (ctrl->is_pem)
{
(*ctx)->u.rparm.assume_pem = 1;
(*ctx)->u.rparm.assume_base64 = 1;
rc = ksba_reader_set_cb (r, base64_reader_cb, &(*ctx)->u.rparm);
}
else if (ctrl->is_base64)
{
(*ctx)->u.rparm.assume_base64 = 1;
rc = ksba_reader_set_cb (r, base64_reader_cb, &(*ctx)->u.rparm);
}
else if (ctrl->autodetect_encoding)
{
(*ctx)->u.rparm.autodetect = 1;
rc = ksba_reader_set_cb (r, base64_reader_cb, &(*ctx)->u.rparm);
}
else
rc = ksba_reader_set_cb (r, simple_reader_cb, &(*ctx)->u.rparm);
if (rc)
{
ksba_reader_release (r);
xfree (*ctx); *ctx = NULL;
return map_ksba_err (rc);
}
*r_reader = r;
return 0;
}
void
gpgsm_destroy_reader (Base64Context ctx)
{
xfree (ctx);
}
/* Create a writer for the given stream. Depending on the control
information an output encoding is automagically choosen. The
function returns a Base64Context object which must be passed to the
gpgme_destroy_writer function. The created KsbaWriter object is
also returned, but the caller must not call the ksba_reader_release
function on. */
int
gpgsm_create_writer (Base64Context *ctx,
CTRL ctrl, FILE *fp, KsbaWriter *r_writer)
{
int rc;
KsbaWriter w;
*r_writer = NULL;
*ctx = xtrycalloc (1, sizeof **ctx);
if (!*ctx)
return seterr (Out_Of_Core);
w = ksba_writer_new ();
if (!w)
{
xfree (*ctx); *ctx = NULL;
return seterr (Out_Of_Core);
}
if (ctrl->create_pem || ctrl->create_base64)
{
(*ctx)->u.wparm.fp = fp;
if (ctrl->create_pem)
(*ctx)->u.wparm.pem_name = ctrl->pem_name? ctrl->pem_name
: "CMS OBJECT";
rc = ksba_writer_set_cb (w, base64_writer_cb, &(*ctx)->u.wparm);
}
else
rc = ksba_writer_set_file (w, fp);
if (rc)
{
ksba_writer_release (w);
xfree (*ctx); *ctx = NULL;
return map_ksba_err (rc);
}
*r_writer = w;
return 0;
}
int
gpgsm_finish_writer (Base64Context ctx)
{
struct writer_cb_parm_s *parm;
if (!ctx)
return GNUPG_Invalid_Value;
parm = &ctx->u.wparm;
if (parm->did_finish)
return 0; /* already done */
parm->did_finish = 1;
if (!parm->fp)
return 0; /* callback was not used */
return base64_finish_write (parm);
}
void
gpgsm_destroy_writer (Base64Context ctx)
{
xfree (ctx);
}
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