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As promised a agent which already does some things. Not very useful

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yet but may be of help for using it in ther contexts.
This commit is contained in:
Werner Koch 2001-11-25 14:53:10 +00:00
parent f60dc501d2
commit 922cedfe58
5 changed files with 220 additions and 44 deletions
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1
agent/Makefile.am
View File

@ -29,6 +29,7 @@ gpg_agent_SOURCES = \
pksign.c
gpg_agent_LDADD = ../jnlib/libjnlib.a ../assuan/libassuan.a \
../common/libcommon.a \
../../libgcrypt/src/.libs/libgcrypt.so.1

3
agent/agent.h
View File

@ -55,10 +55,11 @@ struct server_local_s;
struct server_control_s {
struct server_local_s *server_local;
struct {
int algo;
unsigned char value[MAX_DIGEST_LEN];
int valuelen;
} digest;
char keygrip[20];
};
typedef struct server_control_s *CTRL;

87
agent/command.c
View File

@ -44,13 +44,55 @@
*(p) <= 'F'? (*(p)-'A'+10):(*(p)-'a'+10))
#define xtoi_2(p) ((xtoi_1(p) * 16) + xtoi_1((p)+1))
#if MAX_DIGEST_LEN < 20
#error MAX_DIGEST_LEN shorter than keygrip
#endif
/* Data used to associate an Assuan context with local server data */
struct server_local_s {
ASSUAN_CONTEXT assuan_ctx;
int message_fd;
};
/* SETHASH <hexstring>
static void
reset_notify (ASSUAN_CONTEXT ctx)
{
CTRL ctrl = assuan_get_pointer (ctx);
memset (ctrl->keygrip, 0, 20);
ctrl->digest.valuelen = 0;
}
/* SIGKEY <hexstring_with_keygrip>
Set the key used for a sign operation */
static int
cmd_sigkey (ASSUAN_CONTEXT ctx, char *line)
{
int n;
char *p;
CTRL ctrl = assuan_get_pointer (ctx);
unsigned char *buf;
/* parse the hash value */
for (p=line,n=0; hexdigitp (*p); p++, n++)
;
if (*p)
return set_error (Parameter_Error, "invalid hexstring");
if ((n&1))
return set_error (Parameter_Error, "odd number of digits");
n /= 2;
if (n != 20)
return set_error (Parameter_Error, "invalid length of keygrip");
buf = ctrl->keygrip;
for (p=line, n=0; n < 20; p += 2, n++)
buf[n] = xtoi_2 (p);
return 0;
}
/* SETHASH <algonumber> <hexstring>
The client can use this command to tell the server about the data
(which usually is a hash) to be signed. */
@ -61,6 +103,16 @@ cmd_sethash (ASSUAN_CONTEXT ctx, char *line)
char *p;
CTRL ctrl = assuan_get_pointer (ctx);
unsigned char *buf;
char *endp;
int algo;
/* parse the algo number and check it */
algo = (int)strtoul (line, &endp, 10);
for (line = endp; *line == ' ' || *line == '\t'; line++)
;
if (!algo || gcry_md_test_algo (algo))
return set_error (Unsupported_Algorithm, NULL);
ctrl->digest.algo = algo;
/* parse the hash value */
for (p=line,n=0; hexdigitp (*p); p++, n++)
@ -102,36 +154,6 @@ cmd_pksign (ASSUAN_CONTEXT ctx, char *line)
}
/* MESSAGE FD=<n>
Set the file descriptor to read a message which is used with
detached signatures */
static int
cmd_message (ASSUAN_CONTEXT ctx, char *line)
{
#if 0
char *endp;
int fd;
CTRL ctrl = assuan_get_pointer (ctx);
if (strncmp (line, "FD=", 3))
return set_error (Syntax_Error, "FD=<n> expected");
line += 3;
if (!digitp (*line))
return set_error (Syntax_Error, "number required");
fd = strtoul (line, &endp, 10);
if (*endp)
return set_error (Syntax_Error, "garbage found");
if (fd == -1)
return set_error (No_Input, NULL);
ctrl->server_local->message_fd = fd;
return 0;
#endif
return set_error (Not_Implemented, NULL);
}
/* Tell the assuan library about our commands */
static int
@ -142,11 +164,11 @@ register_commands (ASSUAN_CONTEXT ctx)
int cmd_id;
int (*handler)(ASSUAN_CONTEXT, char *line);
} table[] = {
{ "SIGKEY", 0, cmd_sigkey },
{ "SETHASH", 0, cmd_sethash },
{ "PKSIGN", 0, cmd_pksign },
{ "", ASSUAN_CMD_INPUT, NULL },
{ "", ASSUAN_CMD_OUTPUT, NULL },
{ "MESSAGE", 0, cmd_message },
{ NULL }
};
int i, j, rc;
@ -160,6 +182,7 @@ register_commands (ASSUAN_CONTEXT ctx)
if (rc)
return rc;
}
assuan_register_reset_notify (ctx, reset_notify);
return 0;
}

34
agent/gpg-agent.c
View File

@ -102,9 +102,13 @@ typedef struct {
#define MAX_CACHE_AGE 1000 /* should fit into an integer */
static volatile int caught_fatal_sig = 0;
static volatile int shut_me_down = 0;
static CACHE_SLOT the_cache[MAX_CACHE_ENTRIES];
/* static CACHE_SLOT the_cache[MAX_CACHE_ENTRIES]; */
static char *socket_name = NULL;
/* It is possible that we are currently running under setuid permissions */
static int maybe_setuid = 1;
#define buftou32( p ) ((*(byte*)(p) << 24) | (*((byte*)(p)+1)<< 16) | \
(*((byte*)(p)+2) << 8) | (*((byte*)(p)+3)))
#define u32tobuf( p, a ) do { \
@ -116,10 +120,7 @@ static char *socket_name = NULL;
static int start_listening ( const char *name );
static int writen ( int fd, const void *buf, size_t nbytes );
static int readn ( int fd, void *buf, size_t buflen, size_t *ret_nread );
static void process_request ( int fd );
static const char *
@ -204,6 +205,7 @@ main (int argc, char **argv )
{
ARGPARSE_ARGS pargs;
int orig_argc;
int may_coredump;
char **orig_argv;
FILE *configfp = NULL;
char *configname = NULL;
@ -223,6 +225,10 @@ main (int argc, char **argv )
char *logfile = NULL;
set_strusage( my_strusage );
gcry_control (GCRYCTL_SUSPEND_SECMEM_WARN);
/* Please note that we may running SUID(ROOT), so be very CAREFUL
when adding any stuff between here and the call to INIT_SECMEM()
somewhere after the option parsing */
/* log_set_name ("gpg-agent"); */
srand (time (NULL)); /* the about dialog uses rand() */
i18n_init ();
@ -236,10 +242,13 @@ main (int argc, char **argv )
}
assuan_set_malloc_hooks (gcry_malloc, gcry_realloc, gcry_free);
gcry_control (GCRYCTL_USE_SECURE_RNDPOOL);
may_coredump = 0/* FIXME: disable_core_dumps()*/;
shell = getenv("SHELL");
if (shell && strlen(shell) >= 3 && !strcmp(shell+strlen(shell)-3, "csh") )
shell = getenv ("SHELL");
if (shell && strlen (shell) >= 3 && !strcmp (shell+strlen (shell)-3, "csh") )
csh_style = 1;
opt.homedir = getenv("GNUPGHOME");
@ -275,6 +284,15 @@ main (int argc, char **argv )
opt.homedir = pargs.r.ret_str;
}
/* initialize the secure memory. */
gcry_control (GCRYCTL_INIT_SECMEM, 16384, 0);
maybe_setuid = 0;
/*
Now we are now working under our real uid
*/
if (default_config)
configname = make_filename (opt.homedir, "gpg-agent.conf", NULL );
@ -648,6 +666,7 @@ start_listening (const char *name)
return -1;
}
#if 0
/* Look for the passprase as given by the 20 bytes DATA and return it's
slot number. If this passphrase is not in the cache, return -1 */
static int
@ -751,7 +770,6 @@ passphrase_dialog ( const byte *fpr, const char *user_string )
}
static int
writen ( int fd, const void *buf, size_t nbytes )
{
@ -993,6 +1011,6 @@ process_request ( int fd )
return;
#endif
}
#endif

139
agent/pksign.c
View File

@ -24,16 +24,149 @@
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include <unistd.h>
#include "agent.h"
/* SIGN whatever information we have accumulated in CTRL and write it back to
OUTFP. */
static int
do_encode_md (const unsigned char *digest, size_t digestlen, int algo,
unsigned int nbits, GCRY_MPI *r_val)
{
int nframe = (nbits+7) / 8;
byte *frame;
int i, n;
byte asn[100];
size_t asnlen;
asnlen = DIM(asn);
if (gcry_md_algo_info (algo, GCRYCTL_GET_ASNOID, asn, &asnlen))
{
log_error ("No object identifier for algo %d\n", algo);
return GNUPG_Internal_Error;
}
if (digestlen + asnlen + 4 > nframe )
{
log_error ("can't encode a %d bit MD into a %d bits frame\n",
(int)(digestlen*8), (int)nbits);
return GNUPG_Internal_Error;
}
/* We encode the MD in this way:
*
* 0 A PAD(n bytes) 0 ASN(asnlen bytes) MD(len bytes)
*
* PAD consists of FF bytes.
*/
frame = xtrymalloc (nframe);
if (!frame)
return GNUPG_Out_Of_Core;
n = 0;
frame[n++] = 0;
frame[n++] = 1; /* block type */
i = nframe - digestlen - asnlen -3 ;
assert ( i > 1 );
memset ( frame+n, 0xff, i ); n += i;
frame[n++] = 0;
memcpy ( frame+n, asn, asnlen ); n += asnlen;
memcpy ( frame+n, digest, digestlen ); n += digestlen;
assert ( n == nframe );
if (DBG_CRYPTO)
{
int j;
log_debug ("encoded hash:");
for (j=0; j < nframe; j++)
log_printf (" %02X", frame[j]);
log_printf ("\n");
}
gcry_mpi_scan (r_val, GCRYMPI_FMT_USG, frame, &nframe);
xfree (frame);
return 0;
}
/* SIGN whatever information we have accumulated in CTRL and write it
back to OUTFP. */
int
agent_pksign (CTRL ctrl, FILE *outfp)
{
/* our sample key */
const char n[] = "#8732A669BB7C5057AD070EFA54E035C86DF474F7A7EBE2435"
"3DADEB86FFE74C32AEEF9E5C6BD7584CB572520167B3E8C89A1FA75C74FF9E938"
"2710F3B270B638EB96E7486491D81C53CA8A50B4E840B1C7458A4A1E52EC18D681"
"8A2805C9165827F77EF90D55014E4B2AF9386AE8F6462F46A547CB593ABD509311"
"4D3D16375F#";
const char e[] = "#11#";
const char d[] = "#07F3EBABDDDA22D7FB1E8869140D30571586D9B4370DE02213F"
"DD0DDAC3C24FC6BEFF0950BB0CAAD755F7AA788DA12BCF90987341AC8781CC7115"
"B59A115B05D9D99B3D7AF77854DC2EE6A36154512CC0EAD832601038A88E837112"
"AB2A39FD9FBE05E30D6FFA6F43D71C59F423CA43BC91C254A8C89673AB61F326B0"
"762FBC9#";
const char p[] = "#B2ABAD4328E66303E206C53CFBED17F18F712B1C47C966EE13DD"
"AA9AD3616A610ADF513F8376FA48BAE12FED64CECC1E73091A77B45119AF0FC1286A"
"85BD9BBD#";
const char q[] = "#C1B648B294BB9AEE7FEEB77C4F64E9333E4EA9A7C54D521356FB"
"BBB7558A0E7D6331EC7B42E3F0CD7BBBA9B7A013422F615F10DCC1E8462828BF8FC7"
"39C5E34B#";
const char u[] = "#A9B5EFF9C80A4A356B9A95EB63E381B262071E5CE9C1F32FF03"
"83AD8289BED8BC690555E54411FA2FDB9B49638A21B2046C325F5633B4B1ECABEBFD"
"1B3519072#";
return -1;
GCRY_SEXP s_skey, s_hash, s_sig;
GCRY_MPI frame;
int rc;
char *buf;
size_t len;
/* create a secret key as an sexp */
log_debug ("Using HARDWIRED secret key\n");
asprintf (&buf, "(private-key(oid.1.2.840.113549.1.1.1"
"(n %s)(e %s)(d %s)(p %s)(q %s)(u %s)))",
n, e, d, p, q, u);
/* asprintf does not use our allocation fucntions, so we can't
use our free */
rc = gcry_sexp_sscan (&s_skey, NULL, buf, strlen(buf));
free (buf);
if (rc)
{
log_error ("failed to build S-Exp: %s\n", gcry_strerror (rc));
return map_gcry_err (rc);
}
/* put the hash into a sexp */
rc = do_encode_md (ctrl->digest.value,
ctrl->digest.valuelen,
ctrl->digest.algo,
gcry_pk_get_nbits (s_skey),
&frame);
if (rc)
{
/* fixme: clean up some things */
return rc;
}
if ( gcry_sexp_build (&s_hash, NULL, "%m", frame) )
BUG ();
/* sign */
rc = gcry_pk_sign (&s_sig, s_hash, s_skey);
if (rc)
{
log_error ("signing failed: %s\n", gcry_strerror (rc));
return map_gcry_err (rc);
}
len = gcry_sexp_sprint (s_sig, GCRYSEXP_FMT_CANON, NULL, 0);
assert (len);
buf = xmalloc (len);
len = gcry_sexp_sprint (s_sig, GCRYSEXP_FMT_CANON, buf, len);
assert (len);
fwrite (buf, 1, strlen(buf), outfp);
return 0;
}