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command-ssh.c: Fix saving of RSA keys (meaning of p/q/u was borked);

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correctly use secure memory for message requests.
This commit is contained in:
Moritz Schulte 2004-12-09 19:15:50 +00:00
parent c8fdb50dfb
commit fbf6eb0ada
1 changed files with 30 additions and 5 deletions
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35
agent/command-ssh.c
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@ -96,6 +96,21 @@ typedef struct ssh_key_type_spec
static uint32_t lifetime_default;
/* General utility functions. */
static void *
realloc_secure (void *a, size_t n)
{
void *p;
if (a)
p = gcry_realloc (a, n);
else
p = gcry_malloc_secure (n);
return p;
}
/* Primitive I/O functions. */
static gpg_error_t
@ -532,14 +547,14 @@ ssh_key_modifier_rsa (const char *elems, gcry_mpi_t *mpis)
/* Modifying only necessary for secret keys. */
goto out;
u = mpis[3];
p = mpis[4];
q = mpis[5];
u = mpis[3];
if (gcry_mpi_cmp (p, q))
if (gcry_mpi_cmp (p, q) > 0)
{
/* P shall be smaller then Q! Swap primes. iqmp becomes u. */
gcry_mpi_t tmp = NULL;
gcry_mpi_t tmp;
tmp = mpis[4];
mpis[4] = mpis[5];
@ -656,6 +671,7 @@ ssh_sexp_construct (gcry_sexp_t *sexp,
const char *elems;
size_t elems_n;
unsigned int i;
unsigned int j;
void **arg_list;
err = 0;
@ -687,7 +703,15 @@ ssh_sexp_construct (gcry_sexp_t *sexp,
for (i = 0; i < elems_n; i++)
{
sprintf (strchr (sexp_template, 0), "(%c %%m)", elems[i]);
arg_list[i] = &mpis[i];
if (secret)
{
for (j = 0; j < elems_n; j++)
if (key_spec.elems_key_secret[j] == elems[i])
break;
}
else
j = i;
arg_list[i] = &mpis[j];
}
arg_list[i] = &comment;
sprintf (strchr (sexp_template, 0), ") (comment %%s))");
@ -2230,7 +2254,8 @@ start_command_handler_ssh (int sock_client)
log_debug ("[ssh-agent] Received request of length: %u\n",
request_size);
stream_request = es_mopen (NULL, 0, 0, 1, NULL, NULL, "r+");
stream_request = es_mopen (NULL, 0, 0, 1,
realloc_secure, gcry_free, "r+");
if (! stream_request)
{
err = gpg_error_from_errno (errno);