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/* certdump.c - Dump a certificate for debugging
* Copyright (C) 2001, 2004 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>
#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif
#ifdef HAVE_LANGINFO_CODESET
#include <langinfo.h>
#endif
#include "gpgsm.h"
#include <gcrypt.h>
#include <ksba.h>
#include "keydb.h"
#include "i18n.h"
struct dn_array_s {
char *key;
char *value;
int multivalued;
int done;
};
/* print the first element of an S-Expression */
void
gpgsm_print_serial (FILE *fp, ksba_const_sexp_t p)
{
unsigned long n;
char *endp;
if (!p)
fputs (_("none"), fp);
else if (*p != '(')
fputs ("[Internal error - not an S-expression]", fp);
else
{
p++;
n = strtoul (p, &endp, 10);
p = endp;
if (*p!=':')
fputs ("[Internal Error - invalid S-expression]", fp);
else
{
for (p++; n; n--, p++)
fprintf (fp, "%02X", *p);
}
}
}
void
gpgsm_dump_serial (ksba_const_sexp_t p)
{
unsigned long n;
char *endp;
if (!p)
log_printf ("none");
else if (*p != '(')
log_printf ("ERROR - not an S-expression");
else
{
p++;
n = strtoul (p, &endp, 10);
p = endp;
if (*p!=':')
log_printf ("ERROR - invalid S-expression");
else
{
for (p++; n; n--, p++)
log_printf ("%02X", *p);
}
}
}
char *
gpgsm_format_serial (ksba_const_sexp_t p)
{
unsigned long n;
char *endp;
char *buffer;
int i;
if (!p)
return NULL;
if (*p != '(')
BUG (); /* Not a valid S-expression. */
p++;
n = strtoul (p, &endp, 10);
p = endp;
if (*p!=':')
BUG (); /* Not a valid S-expression. */
p++;
buffer = xtrymalloc (n*2+1);
if (buffer)
{
for (i=0; n; n--, p++, i+=2)
sprintf (buffer+i, "%02X", *(unsigned char *)p);
buffer[i] = 0;
}
return buffer;
}
void
gpgsm_print_time (FILE *fp, ksba_isotime_t t)
{
if (!t || !*t)
fputs (_("none"), fp);
else
fprintf (fp, "%.4s-%.2s-%.2s %.2s:%.2s:%s", t, t+4, t+6, t+9, t+11, t+13);
}
void
gpgsm_dump_time (ksba_isotime_t t)
{
if (!t || !*t)
log_printf (_("[none]"));
else
log_printf ("%.4s-%.2s-%.2s %.2s:%.2s:%s",
t, t+4, t+6, t+9, t+11, t+13);
}
void
gpgsm_dump_string (const char *string)
{
if (!string)
log_printf ("[error]");
else
{
const unsigned char *s;
for (s=string; *s; s++)
{
if (*s < ' ' || (*s >= 0x7f && *s <= 0xa0))
break;
}
if (!*s && *string != '[')
log_printf ("%s", string);
else
{
log_printf ( "[ ");
log_printhex (NULL, string, strlen (string));
log_printf ( " ]");
}
}
}
void
gpgsm_dump_cert (const char *text, ksba_cert_t cert)
{
ksba_sexp_t sexp;
unsigned char *p;
char *dn;
ksba_isotime_t t;
log_debug ("BEGIN Certificate `%s':\n", text? text:"");
if (cert)
{
sexp = ksba_cert_get_serial (cert);
log_debug (" serial: ");
gpgsm_dump_serial (sexp);
ksba_free (sexp);
log_printf ("\n");
ksba_cert_get_validity (cert, 0, t);
log_debug (" notBefore: ");
gpgsm_dump_time (t);
log_printf ("\n");
ksba_cert_get_validity (cert, 1, t);
log_debug (" notAfter: ");
gpgsm_dump_time (t);
log_printf ("\n");
dn = ksba_cert_get_issuer (cert, 0);
log_debug (" issuer: ");
gpgsm_dump_string (dn);
ksba_free (dn);
log_printf ("\n");
dn = ksba_cert_get_subject (cert, 0);
log_debug (" subject: ");
gpgsm_dump_string (dn);
ksba_free (dn);
log_printf ("\n");
log_debug (" hash algo: %s\n", ksba_cert_get_digest_algo (cert));
p = gpgsm_get_fingerprint_string (cert, 0);
log_debug (" SHA1 Fingerprint: %s\n", p);
xfree (p);
}
log_debug ("END Certificate\n");
}
/* helper for the rfc2253 string parser */
static const unsigned char *
parse_dn_part (struct dn_array_s *array, const unsigned char *string)
{
static struct {
const char *label;
const char *oid;
} label_map[] = {
/* Warning: When adding new labels, make sure that the buffer
below we be allocated large enough. */
{"EMail", "1.2.840.113549.1.9.1" },
{"T", "2.5.4.12" },
{"GN", "2.5.4.42" },
{"SN", "2.5.4.4" },
{"NameDistinguisher", "0.2.262.1.10.7.20"},
{"ADDR", "2.5.4.16" },
{"BC", "2.5.4.15" },
{"D", "2.5.4.13" },
{"PostalCode", "2.5.4.17" },
{"Pseudo", "2.5.4.65" },
{"SerialNumber", "2.5.4.5" },
{NULL, NULL}
};
const unsigned char *s, *s1;
size_t n;
unsigned char *p;
int i;
/* Parse attributeType */
for (s = string+1; *s && *s != '='; s++)
;
if (!*s)
return NULL; /* error */
n = s - string;
if (!n)
return NULL; /* empty key */
/* We need to allocate a few bytes more due to the possible mapping
from the shorter OID to the longer label. */
array->key = p = xtrymalloc (n+10);
if (!array->key)
return NULL;
memcpy (p, string, n);
p[n] = 0;
trim_trailing_spaces (p);
if (digitp (p))
{
for (i=0; label_map[i].label; i++ )
if ( !strcmp (p, label_map[i].oid) )
{
strcpy (p, label_map[i].label);
break;
}
}
string = s + 1;
if (*string == '#')
{ /* hexstring */
string++;
for (s=string; hexdigitp (s); s++)
s++;
n = s - string;
if (!n || (n & 1))
return NULL; /* Empty or odd number of digits. */
n /= 2;
array->value = p = xtrymalloc (n+1);
if (!p)
return NULL;
for (s1=string; n; s1 += 2, n--, p++)
{
*p = xtoi_2 (s1);
if (!*p)
*p = 0x01; /* Better print a wrong value than truncating
the string. */
}
*p = 0;
}
else
{ /* regular v3 quoted string */
for (n=0, s=string; *s; s++)
{
if (*s == '\\')
{ /* pair */
s++;
if (*s == ',' || *s == '=' || *s == '+'
|| *s == '<' || *s == '>' || *s == '#' || *s == ';'
|| *s == '\\' || *s == '\"' || *s == ' ')
n++;
else if (hexdigitp (s) && hexdigitp (s+1))
{
s++;
n++;
}
else
return NULL; /* invalid escape sequence */
}
else if (*s == '\"')
return NULL; /* invalid encoding */
else if (*s == ',' || *s == '=' || *s == '+'
|| *s == '<' || *s == '>' || *s == '#' || *s == ';' )
break;
else
n++;
}
array->value = p = xtrymalloc (n+1);
if (!p)
return NULL;
for (s=string; n; s++, n--)
{
if (*s == '\\')
{
s++;
if (hexdigitp (s))
{
*p++ = xtoi_2 (s);
s++;
}
else
*p++ = *s;
}
else
*p++ = *s;
}
*p = 0;
}
return s;
}
/* Parse a DN and return an array-ized one. This is not a validating
parser and it does not support any old-stylish syntax; KSBA is
expected to return only rfc2253 compatible strings. */
static struct dn_array_s *
parse_dn (const unsigned char *string)
{
struct dn_array_s *array;
size_t arrayidx, arraysize;
int i;
arraysize = 7; /* C,ST,L,O,OU,CN,email */
arrayidx = 0;
array = xtrymalloc ((arraysize+1) * sizeof *array);
if (!array)
return NULL;
while (*string)
{
while (*string == ' ')
string++;
if (!*string)
break; /* ready */
if (arrayidx >= arraysize)
{
struct dn_array_s *a2;
arraysize += 5;
a2 = xtryrealloc (array, (arraysize+1) * sizeof *array);
if (!a2)
goto failure;
array = a2;
}
array[arrayidx].key = NULL;
array[arrayidx].value = NULL;
string = parse_dn_part (array+arrayidx, string);
if (!string)
goto failure;
while (*string == ' ')
string++;
array[arrayidx].multivalued = (*string == '+');
array[arrayidx].done = 0;
arrayidx++;
if (*string && *string != ',' && *string != ';' && *string != '+')
goto failure; /* invalid delimiter */
if (*string)
string++;
}
array[arrayidx].key = NULL;
array[arrayidx].value = NULL;
return array;
failure:
for (i=0; i < arrayidx; i++)
{
xfree (array[i].key);
xfree (array[i].value);
}
xfree (array);
return NULL;
}
static void
print_dn_part (FILE *fp, struct dn_array_s *dn, const char *key)
{
struct dn_array_s *first_dn = dn;
for (; dn->key; dn++)
{
if (!dn->done && !strcmp (dn->key, key))
{
/* Forward to the last multi-valued RDN, so that we can
print them all in reverse in the correct order. Note
that this overrides the the standard sequence but that
seems to a reasonable thing to do with multi-valued
RDNs. */
while (dn->multivalued && dn[1].key)
dn++;
next:
if (!dn->done && dn->value && *dn->value)
{
fprintf (fp, "/%s=", dn->key);
print_sanitized_utf8_string (fp, dn->value, '/');
}
dn->done = 1;
if (dn > first_dn && dn[-1].multivalued)
{
dn--;
goto next;
}
}
}
}
/* Print all parts of a DN in a "standard" sequence. We first print
all the known parts, followed by the uncommon ones */
static void
print_dn_parts (FILE *fp, struct dn_array_s *dn)
{
const char *stdpart[] = {
"CN", "OU", "O", "STREET", "L", "ST", "C", "EMail", NULL
};
int i;
for (i=0; stdpart[i]; i++)
print_dn_part (fp, dn, stdpart[i]);
/* Now print the rest without any specific ordering */
for (; dn->key; dn++)
print_dn_part (fp, dn, dn->key);
}
void
gpgsm_print_name (FILE *fp, const char *name)
{
const unsigned char *s;
int i;
s = name;
if (!s)
{
fputs (_("[Error - No name]"), fp);
}
else if (*s == '<')
{
const unsigned char *s2 = strchr (s+1, '>');
if (s2)
print_sanitized_utf8_buffer (fp, s + 1, s2 - s - 1, 0);
}
else if (*s == '(')
fputs (_("[Error - unknown encoding]"), fp);
else if (!((*s >= '0' && *s < '9')
|| (*s >= 'A' && *s <= 'Z')
|| (*s >= 'a' && *s <= 'z')))
fputs (_("[Error - invalid encoding]"), fp);
else
{
struct dn_array_s *dn = parse_dn (s);
if (!dn)
fputs (_("[Error - invalid DN]"), fp);
else
{
print_dn_parts (fp, dn);
for (i=0; dn[i].key; i++)
{
xfree (dn[i].key);
xfree (dn[i].value);
}
xfree (dn);
}
}
}
/* A cookie structure used for the memory stream. */
struct format_name_cookie
{
char *buffer; /* Malloced buffer with the data to deliver. */
size_t size; /* Allocated size of this buffer. */
size_t len; /* strlen (buffer). */
int error; /* system error code if any. */
};
/* The writer function for the memory stream. */
static int
format_name_writer (void *cookie, const char *buffer, size_t size)
{
struct format_name_cookie *c = cookie;
char *p;
if (c->buffer)
p = xtryrealloc (c->buffer, c->size + size + 1);
else
p = xtrymalloc (size + 1);
if (!p)
{
c->error = errno;
xfree (c->buffer);
errno = c->error;
return -1;
}
c->buffer = p;
memcpy (p + c->len, buffer, size);
c->len += size;
p[c->len] = 0; /* Terminate string. */
return size;
}
/* Format NAME which is expected to be in rfc2253 format into a better
human readable format. Caller must free the returned string. NULL
is returned in case of an error. */
char *
gpgsm_format_name (const char *name)
{
#if defined (HAVE_FOPENCOOKIE) || defined (HAVE_FUNOPEN)
FILE *fp;
struct format_name_cookie cookie;
memset (&cookie, 0, sizeof cookie);
#ifdef HAVE_FOPENCOOKIE
{
cookie_io_functions_t io = { NULL };
io.write = format_name_writer;
fp = fopencookie (&cookie, "w", io);
}
#else /*!HAVE_FOPENCOOKIE*/
{
fp = funopen (&cookie, NULL, format_name_writer, NULL, NULL);
}
#endif /*!HAVE_FOPENCOOKIE*/
if (!fp)
{
int save_errno = errno;
log_error ("error creating memory stream: %s\n", strerror (errno));
errno = save_errno;
return NULL;
}
gpgsm_print_name (fp, name);
fclose (fp);
if (cookie.error || !cookie.buffer)
{
xfree (cookie.buffer);
errno = cookie.error;
return NULL;
}
return cookie.buffer;
#else /* No fun - use the name verbatim. */
return xtrystrdup (name);
#endif /* No fun. */
}
/* Create a key description for the CERT, this may be passed to the
pinentry. The caller must free the returned string. NULL may be
returned on error. */
char *
gpgsm_format_keydesc (ksba_cert_t cert)
{
int rc;
char *name, *subject, *buffer, *p;
const char *s;
ksba_isotime_t t;
char created[20];
char *sn;
ksba_sexp_t sexp;
char *orig_codeset = NULL;
name = ksba_cert_get_subject (cert, 0);
subject = name? gpgsm_format_name (name) : NULL;
ksba_free (name); name = NULL;
sexp = ksba_cert_get_serial (cert);
sn = sexp? gpgsm_format_serial (sexp) : NULL;
ksba_free (sexp);
ksba_cert_get_validity (cert, 0, t);
if (t && *t)
sprintf (created, "%.4s-%.2s-%.2s", t, t+4, t+6);
else
*created = 0;
#ifdef ENABLE_NLS
/* The Assuan agent protol requires us to transmit utf-8 strings */
orig_codeset = bind_textdomain_codeset (PACKAGE_GT, NULL);
#ifdef HAVE_LANGINFO_CODESET
if (!orig_codeset)
orig_codeset = nl_langinfo (CODESET);
#endif
if (orig_codeset)
{ /* We only switch when we are able to restore the codeset later. */
orig_codeset = xstrdup (orig_codeset);
if (!bind_textdomain_codeset (PACKAGE_GT, "utf-8"))
orig_codeset = NULL;
}
#endif
rc = asprintf (&name,
_("Please enter the passphrase to unlock the"
" secret key for:\n"
"\"%s\"\n"
"S/N %s, ID %08lX, created %s" ),
subject? subject:"?",
sn? sn: "?",
gpgsm_get_short_fingerprint (cert),
created);
#ifdef ENABLE_NLS
if (orig_codeset)
bind_textdomain_codeset (PACKAGE_GT, orig_codeset);
#endif
xfree (orig_codeset);
if (rc < 0)
{
int save_errno = errno;
xfree (subject);
xfree (sn);
errno = save_errno;
return NULL;
}
xfree (subject);
xfree (sn);
buffer = p = xtrymalloc (strlen (name) * 3 + 1);
for (s=name; *s; s++)
{
if (*s < ' ' || *s == '+')
{
sprintf (p, "%%%02X", *(unsigned char *)s);
p += 3;
}
else if (*s == ' ')
*p++ = '+';
else
*p++ = *s;
}
*p = 0;
free (name);
return buffer;
}

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