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Code Activity

gpg: Fix buffering problem in --list-config.

Browse Source 
* g10/gpg.c (list_config): Replace print_sanitized_string2 by
es_write_sanitized.

* common/stringhelp.c (print_sanitized_buffer2): Remove.
(print_sanitized_buffer, print_sanitized_utf8_buffer): Remove.
(print_sanitized_utf8_buffer, print_sanitized_utf8_string): Remove.
(print_sanitized_string): Remove.

* sm/certdump.c (print_dn_part, print_dn_parts): Remove arg FP.
(pretty_print_sexp, gpgsm_print_name2, gpgsm_print_name): Remove.
--

Mixing stdio and estream is never a good idea.  This fix also allows
us to remove a lot of garbage.

Reported-by: Jason A. Donenfeld <Jason@zx2c4.com>
GnuPG-bug-id: 1822
Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2015-01-28 20:12:21 +01:00
parent 0c2bfd9d5a
commit d8eea25b8b
4 changed files with 14 additions and 259 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

123
common/stringhelp.c
View File

@ -671,129 +671,6 @@ hextobyte (const char *s)
}
/* Print a BUFFER to stream FP while replacing all control characters
and the characters DELIM and DELIM2 with standard C escape
sequences. Returns the number of characters printed. */
size_t
print_sanitized_buffer2 (FILE *fp, const void *buffer, size_t length,
int delim, int delim2)
{
const unsigned char *p = buffer;
size_t count = 0;
for (; length; length--, p++, count++)
{
if (*p < 0x20
|| *p == 0x7f
|| *p == delim
|| *p == delim2
|| ((delim || delim2) && *p=='\\'))
{
putc ('\\', fp);
count++;
if (*p == '\n')
{
putc ('n', fp);
count++;
}
else if (*p == '\r')
{
putc ('r', fp);
count++;
}
else if (*p == '\f')
{
putc ('f', fp);
count++;
}
else if (*p == '\v')
{
putc ('v', fp);
count++;
}
else if (*p == '\b')
{
putc ('b', fp);
count++;
}
else if (!*p)
{
putc('0', fp);
count++;
}
else
{
fprintf (fp, "x%02x", *p);
count += 3;
}
}
else
{
putc (*p, fp);
count++;
}
}
return count;
}
/* Same as print_sanitized_buffer2 but with just one delimiter. */
size_t
print_sanitized_buffer (FILE *fp, const void *buffer, size_t length,
int delim)
{
return print_sanitized_buffer2 (fp, buffer, length, delim, 0);
}
size_t
print_sanitized_utf8_buffer (FILE *fp, const void *buffer,
size_t length, int delim)
{
const char *p = buffer;
size_t i;
/* We can handle plain ascii simpler, so check for it first. */
for (i=0; i < length; i++ )
{
if ( (p[i] & 0x80) )
break;
}
if (i < length)
{
char *buf = utf8_to_native (p, length, delim);
/*(utf8 conversion already does the control character quoting)*/
i = strlen (buf);
fputs (buf, fp);
jnlib_free (buf);
return i;
}
else
return print_sanitized_buffer (fp, p, length, delim);
}
size_t
print_sanitized_string2 (FILE *fp, const char *string, int delim, int delim2)
{
return string? print_sanitized_buffer2 (fp, string, strlen (string),
delim, delim2):0;
}
size_t
print_sanitized_string (FILE *fp, const char *string, int delim)
{
return string? print_sanitized_buffer (fp, string, strlen (string), delim):0;
}
size_t
print_sanitized_utf8_string (FILE *fp, const char *string, int delim)
{
return string? print_sanitized_utf8_buffer (fp,
string, strlen (string),
delim) : 0;
}
/* Create a string from the buffer P_ARG of length N which is suitable
for printing. Caller must release the created string using xfree.
This function terminates the process on memory shortage. */

10
common/stringhelp.h
View File

@ -60,16 +60,6 @@ int compare_filenames( const char *a, const char *b );
int hextobyte (const char *s);
size_t print_sanitized_buffer (FILE *fp, const void *buffer, size_t length,
int delim);
size_t print_sanitized_buffer2 (FILE *fp, const void *buffer, size_t length,
int delim, int delim2);
size_t print_sanitized_utf8_buffer (FILE *fp, const void *buffer,
size_t length, int delim);
size_t print_sanitized_string (FILE *fp, const char *string, int delim);
size_t print_sanitized_string2 (FILE *fp, const char *string,
int delim, int delim2);
size_t print_sanitized_utf8_string (FILE *fp, const char *string, int delim);
char *sanitize_buffer (const void *p, size_t n, int delim);

3
g10/gpg.c
View File

@ -1599,7 +1599,8 @@ list_config(char *items)
for(sl=iter->values;sl;sl=sl->next)
{
print_sanitized_string2 (stdout, sl->d, ':',';');
es_write_sanitized (es_stdout, sl->d, strlen (sl->d),
":;", NULL);
if(sl->next)
es_printf(";");
}

137
sm/certdump.c
View File

@ -479,9 +479,9 @@ parse_dn (const unsigned char *string)
}
/* Print a DN part to STREAM or if STREAM is NULL to FP. */
/* Print a DN part to STREAM. */
static void
print_dn_part (FILE *fp, estream_t stream,
print_dn_part (estream_t stream,
struct dn_array_s *dn, const char *key, int translate)
{
struct dn_array_s *first_dn = dn;
@ -500,24 +500,13 @@ print_dn_part (FILE *fp, estream_t stream,
next:
if (!dn->done && dn->value && *dn->value)
{
if (stream)
{
es_fprintf (stream, "/%s=", dn->key);
if (translate)
print_utf8_buffer3 (stream, dn->value, strlen (dn->value),
"/");
else
es_write_sanitized (stream, dn->value, strlen (dn->value),
"/", NULL);
}
es_fprintf (stream, "/%s=", dn->key);
if (translate)
print_utf8_buffer3 (stream, dn->value, strlen (dn->value),
"/");
else
{
fprintf (fp, "/%s=", dn->key);
if (translate)
print_sanitized_utf8_string (fp, dn->value, '/');
else
print_sanitized_string (fp, dn->value, '/');
}
es_write_sanitized (stream, dn->value, strlen (dn->value),
"/", NULL);
}
dn->done = 1;
if (dn > first_dn && dn[-1].multivalued)
@ -532,7 +521,7 @@ print_dn_part (FILE *fp, estream_t stream,
/* 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, estream_t stream,
print_dn_parts (estream_t stream,
struct dn_array_s *dn, int translate)
{
const char *stdpart[] = {
@ -541,59 +530,14 @@ print_dn_parts (FILE *fp, estream_t stream,
int i;
for (i=0; stdpart[i]; i++)
print_dn_part (fp, stream, dn, stdpart[i], translate);
print_dn_part (stream, dn, stdpart[i], translate);
/* Now print the rest without any specific ordering */
for (; dn->key; dn++)
print_dn_part (fp, stream, dn, dn->key, translate);
print_dn_part (stream, dn, dn->key, translate);
}
/* Print the S-Expression in BUF, which has a valid length of BUFLEN,
as a human readable string in one line to FP. */
static void
pretty_print_sexp (FILE *fp, const unsigned char *buf, size_t buflen)
{
size_t len;
gcry_sexp_t sexp;
char *result, *p;
if ( gcry_sexp_sscan (&sexp, NULL, (const char*)buf, buflen) )
{
fputs (_("[Error - invalid encoding]"), fp);
return;
}
len = gcry_sexp_sprint (sexp, GCRYSEXP_FMT_ADVANCED, NULL, 0);
assert (len);
result = xtrymalloc (len);
if (!result)
{
fputs (_("[Error - out of core]"), fp);
gcry_sexp_release (sexp);
return;
}
len = gcry_sexp_sprint (sexp, GCRYSEXP_FMT_ADVANCED, result, len);
assert (len);
for (p = result; len; len--, p++)
{
if (*p == '\n')
{
if (len > 1) /* Avoid printing the trailing LF. */
fputs ("\\n", fp);
}
else if (*p == '\r')
fputs ("\\r", fp);
else if (*p == '\v')
fputs ("\\v", fp);
else if (*p == '\t')
fputs ("\\t", fp);
else
putc (*p, fp);
}
xfree (result);
gcry_sexp_release (sexp);
}
/* Print the S-Expression in BUF to extended STREAM, which has a valid
length of BUFLEN, as a human readable string in one line to FP. */
static void
@ -640,63 +584,6 @@ pretty_es_print_sexp (estream_t fp, const unsigned char *buf, size_t buflen)
}
void
gpgsm_print_name2 (FILE *fp, const char *name, int translate)
{
const unsigned char *s = (const unsigned char *)name;
int i;
if (!s)
{
fputs (_("[Error - No name]"), fp);
}
else if (*s == '<')
{
const char *s2 = strchr ( (char*)s+1, '>');
if (s2)
{
if (translate)
print_sanitized_utf8_buffer (fp, s + 1, s2 - (char*)s - 1, 0);
else
print_sanitized_buffer (fp, s + 1, s2 - (char*)s - 1, 0);
}
}
else if (*s == '(')
{
pretty_print_sexp (fp, s, gcry_sexp_canon_len (s, 0, NULL, NULL));
}
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, NULL, dn, translate);
for (i=0; dn[i].key; i++)
{
xfree (dn[i].key);
xfree (dn[i].value);
}
xfree (dn);
}
}
}
void
gpgsm_print_name (FILE *fp, const char *name)
{
gpgsm_print_name2 (fp, name, 1);
}
/* This is a variant of gpgsm_print_name sending it output to an estream. */
void
gpgsm_es_print_name2 (estream_t fp, const char *name, int translate)
@ -736,7 +623,7 @@ gpgsm_es_print_name2 (estream_t fp, const char *name, int translate)
es_fputs (_("[Error - invalid DN]"), fp);
else
{
print_dn_parts (NULL, fp, dn, translate);
print_dn_parts (fp, dn, translate);
for (i=0; dn[i].key; i++)
{
xfree (dn[i].key);