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763 lines
20 KiB
C
763 lines
20 KiB
C
/* kska-io-support.c - Supporting functions for ksba reader and writer
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* Copyright (C) 2001-2005, 2007, 2010-2011, 2017 Werner Koch
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* Copyright (C) 2006 g10 Code GmbH
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*
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* This file is part of GnuPG.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of either
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*
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* - the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* or
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*
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* - the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* or both in parallel, as here.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <time.h>
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#include <assert.h>
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#include <ksba.h>
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#include "util.h"
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#include "i18n.h"
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#include "ksba-io-support.h"
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#ifdef HAVE_DOSISH_SYSTEM
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#define LF "\r\n"
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#else
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#define LF "\n"
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#endif
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/* Data used by the reader callbacks. */
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struct reader_cb_parm_s
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{
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estream_t fp;
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unsigned char line[1024];
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int linelen;
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int readpos;
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int have_lf;
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unsigned long line_counter;
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int allow_multi_pem; /* Allow processing of multiple PEM objects. */
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int autodetect; /* Try to detect the input encoding. */
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int assume_pem; /* Assume input encoding is PEM. */
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int assume_base64; /* Assume input is base64 encoded. */
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int identified;
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int is_pem;
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int is_base64;
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int stop_seen;
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int might_be_smime;
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int eof_seen;
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struct {
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int idx;
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unsigned char val;
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int stop_seen;
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} base64;
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};
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/* Data used by the writer callbacks. */
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struct writer_cb_parm_s
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{
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estream_t stream; /* Output stream. */
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char *pem_name; /* Malloced. */
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int wrote_begin;
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int did_finish;
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struct {
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int idx;
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int quad_count;
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unsigned char radbuf[4];
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} base64;
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};
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/* Context for this module's functions. */
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struct gnupg_ksba_io_s {
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union {
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struct reader_cb_parm_s rparm;
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struct writer_cb_parm_s wparm;
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} u;
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union {
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ksba_reader_t reader;
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ksba_writer_t writer;
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} u2;
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};
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/* The base-64 character list */
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static char bintoasc[64] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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/* The reverse base-64 list */
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static unsigned char asctobin[256] = {
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
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0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
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0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12,
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0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24,
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0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
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0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff
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};
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static int
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has_only_base64 (const unsigned char *line, int linelen)
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{
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if (linelen < 20)
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return 0;
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for (; linelen; line++, linelen--)
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{
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if (*line == '\n' || (linelen > 1 && *line == '\r' && line[1] == '\n'))
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break;
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if ( !strchr (bintoasc, *line) )
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return 0;
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}
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return 1; /* yes */
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}
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static int
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is_empty_line (const unsigned char *line, int linelen)
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{
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if (linelen >= 2 && *line == '\r' && line[1] == '\n')
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return 1;
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if (linelen >= 1 && *line == '\n')
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return 1;
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return 0;
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}
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static int
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base64_reader_cb (void *cb_value, char *buffer, size_t count, size_t *nread)
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{
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struct reader_cb_parm_s *parm = cb_value;
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size_t n;
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int c, c2;
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*nread = 0;
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if (!buffer)
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return -1; /* not supported */
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next:
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if (!parm->linelen)
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{
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/* read an entire line or up to the size of the buffer */
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parm->line_counter++;
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parm->have_lf = 0;
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for (n=0; n < DIM(parm->line);)
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{
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c = es_getc (parm->fp);
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if (c == EOF)
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{
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parm->eof_seen = 1;
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if (es_ferror (parm->fp))
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return -1;
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break;
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}
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parm->line[n++] = c;
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if (c == '\n')
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{
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parm->have_lf = 1;
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/* Fixme: we need to skip overlong lines while detecting
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the dashed lines */
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break;
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}
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}
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parm->linelen = n;
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if (!n)
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return -1; /* eof */
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parm->readpos = 0;
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}
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if (!parm->identified)
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{
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if (!parm->autodetect)
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{
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if (parm->assume_pem)
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{
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/* wait for the header line */
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parm->linelen = parm->readpos = 0;
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if (!parm->have_lf
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|| strncmp ((char*)parm->line, "-----BEGIN ", 11)
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|| !strncmp ((char*)parm->line+11, "PGP ", 4))
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goto next;
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parm->is_pem = 1;
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}
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else if (parm->assume_base64)
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parm->is_base64 = 1;
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}
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else if (parm->line_counter == 1 && !parm->have_lf)
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{
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/* first line too long - assume DER encoding */
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parm->is_pem = 0;
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}
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else if (parm->line_counter == 1 && parm->linelen && *parm->line == 0x30)
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{
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/* the very first byte does pretty much look like a SEQUENCE tag*/
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parm->is_pem = 0;
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}
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else if ( parm->have_lf
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&& !strncmp ((char*)parm->line, "-----BEGIN ", 11)
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&& strncmp ((char *)parm->line+11, "PGP ", 4) )
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{
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/* Fixme: we must only compare if the line really starts at
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the beginning */
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parm->is_pem = 1;
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parm->linelen = parm->readpos = 0;
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}
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else if ( parm->have_lf && parm->line_counter == 1
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&& parm->linelen >= 13
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&& !ascii_memcasecmp (parm->line, "Content-Type:", 13))
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{ /* might be a S/MIME body */
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parm->might_be_smime = 1;
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parm->linelen = parm->readpos = 0;
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goto next;
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}
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else if (parm->might_be_smime == 1
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&& is_empty_line (parm->line, parm->linelen))
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{
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parm->might_be_smime = 2;
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parm->linelen = parm->readpos = 0;
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goto next;
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}
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else if (parm->might_be_smime == 2)
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{
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parm->might_be_smime = 0;
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if ( !has_only_base64 (parm->line, parm->linelen))
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{
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parm->linelen = parm->readpos = 0;
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goto next;
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}
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parm->is_pem = 1;
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}
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else
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{
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parm->linelen = parm->readpos = 0;
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goto next;
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}
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parm->identified = 1;
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parm->base64.stop_seen = 0;
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parm->base64.idx = 0;
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}
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n = 0;
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if (parm->is_pem || parm->is_base64)
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{
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if (parm->is_pem && parm->have_lf
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&& !strncmp ((char*)parm->line, "-----END ", 9))
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{
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parm->identified = 0;
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parm->linelen = parm->readpos = 0;
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/* If the caller want to read multiple PEM objects from one
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file, we have to reset our internal state and return a
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EOF immediately. The caller is the expected to use
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ksba_reader_clear to clear the EOF condition and continue
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to read. If we don't want to do that we just return 0
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bytes which will force the ksba_reader to skip until
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EOF. */
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if (parm->allow_multi_pem)
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{
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parm->identified = 0;
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parm->autodetect = 0;
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parm->assume_pem = 1;
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parm->stop_seen = 0;
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return -1; /* Send EOF now. */
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}
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}
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else if (parm->stop_seen)
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{ /* skip the rest of the line */
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parm->linelen = parm->readpos = 0;
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}
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else
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{
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int idx = parm->base64.idx;
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unsigned char val = parm->base64.val;
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while (n < count && parm->readpos < parm->linelen )
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{
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c = parm->line[parm->readpos++];
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if (c == '\n' || c == ' ' || c == '\r' || c == '\t')
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continue;
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if ((c = asctobin[(c2=c)]) == 255)
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{
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if (c2 == '=')
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{ /* pad character: stop */
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if (idx == 1)
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buffer[n++] = val;
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parm->stop_seen = 1;
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break;
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}
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else if (c2 == '-'
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&& parm->readpos == 1
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&& parm->readpos-1+9 < parm->linelen
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&& !strncmp ((char*)parm->line + parm->readpos-1,
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"-----END ", 9))
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{ /* END line seen (padding was not needed). */
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parm->stop_seen = 1;
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break;
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}
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log_error (_("invalid radix64 character %02x skipped\n"),
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c2);
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continue;
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}
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switch (idx)
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{
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case 0:
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val = c << 2;
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break;
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case 1:
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val |= (c>>4)&3;
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buffer[n++] = val;
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val = (c<<4)&0xf0;
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break;
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case 2:
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val |= (c>>2)&15;
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buffer[n++] = val;
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val = (c<<6)&0xc0;
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break;
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case 3:
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val |= c&0x3f;
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buffer[n++] = val;
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break;
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}
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idx = (idx+1) % 4;
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}
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if (parm->readpos == parm->linelen)
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parm->linelen = parm->readpos = 0;
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parm->base64.idx = idx;
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parm->base64.val = val;
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}
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}
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else
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{ /* DER encoded */
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while (n < count && parm->readpos < parm->linelen)
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buffer[n++] = parm->line[parm->readpos++];
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if (parm->readpos == parm->linelen)
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parm->linelen = parm->readpos = 0;
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}
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*nread = n;
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return 0;
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}
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static int
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simple_reader_cb (void *cb_value, char *buffer, size_t count, size_t *nread)
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{
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struct reader_cb_parm_s *parm = cb_value;
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size_t n;
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int c = 0;
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*nread = 0;
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if (!buffer)
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return -1; /* not supported */
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for (n=0; n < count; n++)
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{
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c = es_getc (parm->fp);
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if (c == EOF)
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{
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parm->eof_seen = 1;
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if (es_ferror (parm->fp))
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return -1;
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if (n)
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break; /* Return what we have before an EOF. */
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return -1;
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}
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*(byte *)buffer++ = c;
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}
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*nread = n;
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return 0;
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}
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static int
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base64_writer_cb (void *cb_value, const void *buffer, size_t count)
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{
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struct writer_cb_parm_s *parm = cb_value;
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unsigned char radbuf[4];
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int i, c, idx, quad_count;
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const unsigned char *p;
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estream_t stream = parm->stream;
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if (!count)
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return 0;
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if (!parm->wrote_begin)
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{
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if (parm->pem_name)
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{
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es_fputs ("-----BEGIN ", stream);
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es_fputs (parm->pem_name, stream);
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es_fputs ("-----\n", stream);
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}
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parm->wrote_begin = 1;
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parm->base64.idx = 0;
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parm->base64.quad_count = 0;
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}
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idx = parm->base64.idx;
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quad_count = parm->base64.quad_count;
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for (i=0; i < idx; i++)
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radbuf[i] = parm->base64.radbuf[i];
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for (p=buffer; count; p++, count--)
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{
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radbuf[idx++] = *p;
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if (idx > 2)
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{
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idx = 0;
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c = bintoasc[(*radbuf >> 2) & 077];
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es_putc (c, stream);
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c = bintoasc[(((*radbuf<<4)&060)|((radbuf[1] >> 4)&017))&077];
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es_putc (c, stream);
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c = bintoasc[(((radbuf[1]<<2)&074)|((radbuf[2]>>6)&03))&077];
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es_putc (c, stream);
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c = bintoasc[radbuf[2]&077];
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es_putc (c, stream);
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if (++quad_count >= (64/4))
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{
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es_fputs (LF, stream);
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quad_count = 0;
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}
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}
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}
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for (i=0; i < idx; i++)
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parm->base64.radbuf[i] = radbuf[i];
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parm->base64.idx = idx;
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parm->base64.quad_count = quad_count;
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return es_ferror (stream)? gpg_error_from_syserror () : 0;
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}
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/* This callback is only used in stream mode. However, we don't
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restrict it to this. */
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static int
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plain_writer_cb (void *cb_value, const void *buffer, size_t count)
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{
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struct writer_cb_parm_s *parm = cb_value;
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estream_t stream = parm->stream;
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if (!count)
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return 0;
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es_write (stream, buffer, count, NULL);
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return es_ferror (stream)? gpg_error_from_syserror () : 0;
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}
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static int
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||
base64_finish_write (struct writer_cb_parm_s *parm)
|
||
{
|
||
unsigned char *radbuf;
|
||
int c, idx, quad_count;
|
||
estream_t stream = parm->stream;
|
||
|
||
if (!parm->wrote_begin)
|
||
return 0; /* Nothing written or we are not called in base-64 mode. */
|
||
|
||
/* flush the base64 encoding */
|
||
idx = parm->base64.idx;
|
||
quad_count = parm->base64.quad_count;
|
||
if (idx)
|
||
{
|
||
radbuf = parm->base64.radbuf;
|
||
|
||
c = bintoasc[(*radbuf>>2)&077];
|
||
es_putc (c, stream);
|
||
if (idx == 1)
|
||
{
|
||
c = bintoasc[((*radbuf << 4) & 060) & 077];
|
||
es_putc (c, stream);
|
||
es_putc ('=', stream);
|
||
es_putc ('=', stream);
|
||
}
|
||
else
|
||
{
|
||
c = bintoasc[(((*radbuf<<4)&060)|((radbuf[1]>>4)&017))&077];
|
||
es_putc (c, stream);
|
||
c = bintoasc[((radbuf[1] << 2) & 074) & 077];
|
||
es_putc (c, stream);
|
||
es_putc ('=', stream);
|
||
|
||
}
|
||
if (++quad_count >= (64/4))
|
||
{
|
||
es_fputs (LF, stream);
|
||
quad_count = 0;
|
||
}
|
||
}
|
||
|
||
if (quad_count)
|
||
es_fputs (LF, stream);
|
||
|
||
if (parm->pem_name)
|
||
{
|
||
es_fputs ("-----END ", stream);
|
||
es_fputs (parm->pem_name, stream);
|
||
es_fputs ("-----\n", stream);
|
||
}
|
||
|
||
return es_ferror (stream)? gpg_error_from_syserror () : 0;
|
||
}
|
||
|
||
|
||
|
||
|
||
/* Create a reader for the stream FP. FLAGS can be used to specify
|
||
* the expected input encoding.
|
||
*
|
||
* The function returns a gnupg_ksba_io_t object which must be passed to
|
||
* the gpgme_destroy_reader function. The created ksba_reader_t
|
||
* object is stored at R_READER - the caller must not call the
|
||
* ksba_reader_release function on.
|
||
*
|
||
* The supported flags are:
|
||
*
|
||
* GNUPG_KSBA_IO_PEM - Assume the input is PEM encoded
|
||
* GNUPG_KSBA_IO_BASE64 - Assume the input is Base64 encoded.
|
||
* GNUPG_KSBA_IO_AUTODETECT - The reader tries to detect the encoding.
|
||
* GNUPG_KSBA_IO_MULTIPEM - The reader expects that the caller uses
|
||
* ksba_reader_clear after EOF until no more
|
||
* objects were found.
|
||
*
|
||
* Note that the PEM flag has a higher priority than the BASE64 flag
|
||
* which in turn has a gight priority than the AUTODETECT flag.
|
||
*/
|
||
gpg_error_t
|
||
gnupg_ksba_create_reader (gnupg_ksba_io_t *ctx,
|
||
unsigned int flags, estream_t fp,
|
||
ksba_reader_t *r_reader)
|
||
{
|
||
int rc;
|
||
ksba_reader_t r;
|
||
|
||
*r_reader = NULL;
|
||
*ctx = xtrycalloc (1, sizeof **ctx);
|
||
if (!*ctx)
|
||
return out_of_core ();
|
||
(*ctx)->u.rparm.allow_multi_pem = !!(flags & GNUPG_KSBA_IO_MULTIPEM);
|
||
|
||
rc = ksba_reader_new (&r);
|
||
if (rc)
|
||
{
|
||
xfree (*ctx); *ctx = NULL;
|
||
return rc;
|
||
}
|
||
|
||
(*ctx)->u.rparm.fp = fp;
|
||
if ((flags & GNUPG_KSBA_IO_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 ((flags & GNUPG_KSBA_IO_BASE64))
|
||
{
|
||
(*ctx)->u.rparm.assume_base64 = 1;
|
||
rc = ksba_reader_set_cb (r, base64_reader_cb, &(*ctx)->u.rparm);
|
||
}
|
||
else if ((flags & GNUPG_KSBA_IO_AUTODETECT))
|
||
{
|
||
(*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 rc;
|
||
}
|
||
|
||
(*ctx)->u2.reader = r;
|
||
*r_reader = r;
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Return True if an EOF as been seen. */
|
||
int
|
||
gnupg_ksba_reader_eof_seen (gnupg_ksba_io_t ctx)
|
||
{
|
||
return ctx && ctx->u.rparm.eof_seen;
|
||
}
|
||
|
||
|
||
/* Destroy a reader object. */
|
||
void
|
||
gnupg_ksba_destroy_reader (gnupg_ksba_io_t ctx)
|
||
{
|
||
if (!ctx)
|
||
return;
|
||
|
||
ksba_reader_release (ctx->u2.reader);
|
||
xfree (ctx);
|
||
}
|
||
|
||
|
||
|
||
/* Create a writer for the given STREAM. Depending on FLAGS an output
|
||
* encoding is chosen. In PEM mode PEM_NAME is used for the header
|
||
* and footer lines; if PEM_NAME is NULL the string "CMS OBJECT" is
|
||
* used.
|
||
*
|
||
* The function returns a gnupg_ksba_io_t object which must be passed to
|
||
* the gpgme_destroy_writer function. The created ksba_writer_t
|
||
* object is stored at R_WRITER - the caller must not call the
|
||
* ksba_reader_release function on it.
|
||
*
|
||
* The supported flags are:
|
||
*
|
||
* GNUPG_KSBA_IO_PEM - Write output as PEM
|
||
* GNUPG_KSBA_IO_BASE64 - Write output as plain Base64; note that the PEM
|
||
* flag overrides this flag.
|
||
*
|
||
*/
|
||
gpg_error_t
|
||
gnupg_ksba_create_writer (gnupg_ksba_io_t *ctx, unsigned int flags,
|
||
const char *pem_name, estream_t stream,
|
||
ksba_writer_t *r_writer)
|
||
{
|
||
int rc;
|
||
ksba_writer_t w;
|
||
|
||
*r_writer = NULL;
|
||
*ctx = xtrycalloc (1, sizeof **ctx);
|
||
if (!*ctx)
|
||
return gpg_error_from_syserror ();
|
||
|
||
rc = ksba_writer_new (&w);
|
||
if (rc)
|
||
{
|
||
xfree (*ctx); *ctx = NULL;
|
||
return rc;
|
||
}
|
||
|
||
if ((flags & GNUPG_KSBA_IO_PEM) || (flags & GNUPG_KSBA_IO_BASE64))
|
||
{
|
||
(*ctx)->u.wparm.stream = stream;
|
||
if ((flags & GNUPG_KSBA_IO_PEM))
|
||
{
|
||
(*ctx)->u.wparm.pem_name = xtrystrdup (pem_name
|
||
? pem_name
|
||
: "CMS OBJECT");
|
||
if (!(*ctx)->u.wparm.pem_name)
|
||
{
|
||
rc = gpg_error_from_syserror ();
|
||
ksba_writer_release (w);
|
||
xfree (*ctx); *ctx = NULL;
|
||
return rc;
|
||
}
|
||
}
|
||
rc = ksba_writer_set_cb (w, base64_writer_cb, &(*ctx)->u.wparm);
|
||
}
|
||
else if (stream)
|
||
{
|
||
(*ctx)->u.wparm.stream = stream;
|
||
rc = ksba_writer_set_cb (w, plain_writer_cb, &(*ctx)->u.wparm);
|
||
}
|
||
else
|
||
rc = gpg_error (GPG_ERR_INV_ARG);
|
||
|
||
if (rc)
|
||
{
|
||
ksba_writer_release (w);
|
||
xfree (*ctx); *ctx = NULL;
|
||
return rc;
|
||
}
|
||
|
||
(*ctx)->u2.writer = w;
|
||
*r_writer = w;
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Flush a writer. This is for example required to write the padding
|
||
* or the PEM footer. */
|
||
gpg_error_t
|
||
gnupg_ksba_finish_writer (gnupg_ksba_io_t ctx)
|
||
{
|
||
struct writer_cb_parm_s *parm;
|
||
|
||
if (!ctx)
|
||
return gpg_error (GPG_ERR_INV_VALUE);
|
||
parm = &ctx->u.wparm;
|
||
if (parm->did_finish)
|
||
return 0; /* Already done. */
|
||
parm->did_finish = 1;
|
||
if (!parm->stream)
|
||
return 0; /* Callback was not used. */
|
||
return base64_finish_write (parm);
|
||
}
|
||
|
||
|
||
/* Destroy a writer object. */
|
||
void
|
||
gnupg_ksba_destroy_writer (gnupg_ksba_io_t ctx)
|
||
{
|
||
if (!ctx)
|
||
return;
|
||
|
||
ksba_writer_release (ctx->u2.writer);
|
||
xfree (ctx->u.wparm.pem_name);
|
||
xfree (ctx);
|
||
}
|