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The agent does now work and read the secret keys from the directory

Browse Source 
~/.gnupg-test/private-keys-v1.d/<keygrip-as-20-byte-hex-number>. I
will post a sample key to gpa-dev.
This commit is contained in:
Werner Koch 2001-11-25 18:23:06 +00:00
parent 8cf367848a
commit 0e36c4c6a7
7 changed files with 668 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

102
agent/pksign.c
View File

@ -26,6 +26,7 @@
#include <ctype.h>
#include <assert.h>
#include <unistd.h>
#include <sys/stat.h>
#include "agent.h"
@ -88,52 +89,82 @@ do_encode_md (const unsigned char *digest, size_t digestlen, int algo,
}
static GCRY_SEXP
key_from_file (const unsigned char *grip)
{
int i, rc;
char *fname;
FILE *fp;
struct stat st;
char *buf;
size_t buflen, erroff;
GCRY_SEXP s_skey;
char hexgrip[41];
for (i=0; i < 20; i++)
sprintf (hexgrip+2*i, "%02X", grip[i]);
hexgrip[40] = 0;
fname = make_filename (opt.homedir, "private-keys-v1.d", hexgrip, NULL );
fp = fopen (fname, "rb");
if (!fp)
{
log_error ("can't open `%s': %s\n", fname, strerror (errno));
xfree (fname);
return NULL;
}
if (fstat (fileno(fp), &st))
{
log_error ("can't stat `%s': %s\n", fname, strerror (errno));
xfree (fname);
fclose (fp);
return NULL;
}
buflen = st.st_size;
buf = xmalloc (buflen+1);
if (fread (buf, buflen, 1, fp) != 1)
{
log_error ("error reading `%s': %s\n", fname, strerror (errno));
xfree (fname);
fclose (fp);
xfree (buf);
return NULL;
}
rc = gcry_sexp_sscan (&s_skey, &erroff, buf, buflen);
xfree (fname);
fclose (fp);
xfree (buf);
if (rc)
{
log_error ("failed to build S-Exp (off=%u): %s\n",
(unsigned int)erroff, gcry_strerror (rc));
return NULL;
}
return s_skey;
}
/* 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#";
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)
s_skey = key_from_file (ctrl->keygrip);
if (!s_skey)
{
log_error ("failed to build S-Exp: %s\n", gcry_strerror (rc));
return map_gcry_err (rc);
log_error ("failed to read the secret key\n");
return seterr (No_Secret_Key);
}
/* put the hash into a sexp */
@ -165,6 +196,9 @@ agent_pksign (CTRL ctrl, FILE *outfp)
len = gcry_sexp_sprint (s_sig, GCRYSEXP_FMT_CANON, buf, len);
assert (len);
/* FIXME: we must make sure that no buffering takes place or we are
in full control of the buffer memory (easy to do) - should go
into assuan. */
fwrite (buf, 1, strlen(buf), outfp);
return 0;
}

10
common/errors.h
View File

@ -40,7 +40,15 @@ enum {
GNUPG_Bad_Signature = 11,
GNUPG_Not_Implemented = 12,
GNUPG_Conflict = 13,
GNUPG_Bug = 14
GNUPG_Bug = 14,
GNUPG_Read_Error = 15,
GNUPG_Write_Error = 16,
GNUPG_Incomplete_Line = 17,
GNUPG_Invalid_Response = 18,
GNUPG_No_Agent = 19,
GNUPG_Agent_Error = 20,
GNUPG_No_Public_Key = 21,
GNUPG_No_Secret_Key = 22,
};
/* Status codes - fixme: should go into another file */

1
sm/Makefile.am
View File

@ -29,6 +29,7 @@ gpgsm_SOURCES = \
misc.c \
keydb.c keydb.h \
server.c \
call-agent.c \
fingerprint.c \
certdump.c \
certcheck.c \

556
sm/call-agent.c Normal file
View File

@ -0,0 +1,556 @@
/* call-agent.c - divert operations to the agent
* Copyright (C) 2001 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>
#include <gcrypt.h>
#include "gpgsm.h"
#include "../assuan/assuan.h"
#include "i18n.h"
#ifdef _POSIX_OPEN_MAX
#define MAX_OPEN_FDS _POSIX_OPEN_MAX
#else
#define MAX_OPEN_FDS 20
#endif
#define LINELENGTH 1002 /* 1000 + [CR,]LF */
#define xtoi_1(p) (*(p) <= '9'? (*(p)- '0'): \
*(p) <= 'F'? (*(p)-'A'+10):(*(p)-'a'+10))
#define xtoi_2(p) ((xtoi_1(p) * 16) + xtoi_1((p)+1))
static pid_t agent_pid = -1;
/* fixme: replace this code by calling assuna functions */
static int inbound_fd = -1;
static int outbound_fd = -1;
static struct {
int eof;
char line[LINELENGTH];
int linelen; /* w/o CR, LF - might not be the same as
strlen(line) due to embedded nuls. However a nul
is always written at this pos */
struct {
char line[LINELENGTH];
int linelen ;
} attic;
} inbound;
struct membuf {
size_t len;
size_t size;
char *buf;
int out_of_core;
};
/* A simple implemnation of a dynamic buffer. Use init_membuf() to
create a buffer, put_membuf to append bytes and get_membuf to
release and return the buffer. Allocation errors are detected but
only returned at the final get_membuf(), this helps not to clutter
the code with out of core checks. */
static void
init_membuf (struct membuf *mb, int initiallen)
{
mb->len = 0;
mb->size = initiallen;
mb->out_of_core = 0;
mb->buf = xtrymalloc (initiallen);
if (!mb->buf)
mb->out_of_core = 1;
}
static void
put_membuf (struct membuf *mb, const void *buf, size_t len)
{
if (mb->out_of_core)
return;
if (mb->len + len >= mb->size)
{
char *p;
mb->size += len + 1024;
p = xtryrealloc (mb->buf, mb->size);
if (!p)
{
mb->out_of_core = 1;
return;
}
mb->buf = p;
}
memcpy (mb->buf + mb->len, buf, len);
mb->len += len;
}
static void *
get_membuf (struct membuf *mb, size_t *len)
{
char *p;
if (mb->out_of_core)
{
xfree (mb->buf);
mb->buf = NULL;
return NULL;
}
p = mb->buf;
*len = mb->len;
mb->buf = NULL;
mb->out_of_core = 1; /* don't allow a reuse */
return p;
}
static int
writen (int fd, const void *buf, size_t nbytes)
{
size_t nleft = nbytes;
int nwritten;
while (nleft > 0)
{
nwritten = write (fd, buf, nleft);
if (nwritten < 0)
{
if (errno == EINTR)
nwritten = 0;
else
{
log_error ("write() failed: %s\n", strerror (errno));
return seterr (Write_Error);
}
}
nleft -= nwritten;
buf = (const char*)buf + nwritten;
}
return 0;
}
/* read an entire line */
static int
readline (int fd, char *buf, size_t buflen, int *r_nread, int *eof)
{
size_t nleft = buflen;
int n;
char *p;
*eof = 0;
*r_nread = 0;
while (nleft > 0)
{
do
n = read (fd, buf, nleft);
while (n < 0 && errno == EINTR);
if (n < 0)
{
log_error ("read() error: %s\n", strerror (errno) );
return seterr (Read_Error);
}
if (!n)
{
*eof = 1;
break; /* allow incomplete lines */
}
p = buf;
nleft -= n;
buf += n;
*r_nread += n;
for (; n && *p != '\n'; n--, p++)
;
if (n)
break; /* at least one full line available - that's enough for now */
}
return 0;
}
static int
read_from_agent (int *okay)
{
char *line = inbound.line;
int n, nread;
int rc;
*okay = 0;
restart:
if (inbound.eof)
return -1;
if (inbound.attic.linelen)
{
memcpy (line, inbound.attic.line, inbound.attic.linelen);
nread = inbound.attic.linelen;
inbound.attic.linelen = 0;
for (n=0; n < nread && line[n] != '\n'; n++)
;
if (n < nread)
rc = 0; /* found another line in the attic */
else
{ /* read the rest */
n = nread;
assert (n < LINELENGTH);
rc = readline (inbound_fd, line + n, LINELENGTH - n,
&nread, &inbound.eof);
}
}
else
rc = readline (inbound_fd, line, LINELENGTH,
&nread, &inbound.eof);
if (rc)
return seterr(Read_Error);
if (!nread)
{
assert (inbound.eof);
return -1; /* eof */
}
for (n=0; n < nread; n++)
{
if (line[n] == '\n')
{
if (n+1 < nread)
{
n++;
/* we have to copy the rest because the handlers are
allowed to modify the passed buffer */
memcpy (inbound.attic.line, line+n, nread-n);
inbound.attic.linelen = nread-n;
n--;
}
if (n && line[n-1] == '\r')
n--;
line[n] = 0;
inbound.linelen = n;
if (n && *line == '#')
goto restart;
rc = 0;
if (n >= 1
&& line[0] == 'D' && line[1] == ' ')
*okay = 2; /* data line */
else if (n >= 2
&& line[0] == 'O' && line[1] == 'K'
&& (line[2] == '\0' || line[2] == ' '))
*okay = 1;
else if (n >= 3
&& line[0] == 'E' && line[1] == 'R' && line[2] == 'R'
&& (line[3] == '\0' || line[3] == ' '))
*okay = 0;
else
rc = seterr (Invalid_Response);
return rc;
}
}
*line = 0;
inbound.linelen = 0;
return inbound.eof? seterr (Incomplete_Line):seterr (Invalid_Response);
}
/* Try to connect to the agent via socket or fork it off and work by
pipes. Handle the server's initial greeting */
static int
start_agent (void)
{
int rc;
char *infostr, *p;
int okay;
if (agent_pid != -1)
return 0;
infostr = getenv ("GPG_AGENT_INFO");
if (!infostr)
{
pid_t pid;
int inpipe[2], outpipe[2];
log_info (_("no running gpg-agent - starting one\n"));
if (fflush (NULL))
{
log_error ("error flushing pending output: %s\n", strerror (errno));
return seterr (Write_Error);
}
if (pipe (inpipe))
{
log_error ("error creating pipe: %s\n", strerror (errno));
return seterr (General_Error);
}
if (pipe (outpipe))
{
log_error ("error creating pipe: %s\n", strerror (errno));
close (inpipe[0]);
close (inpipe[1]);
return seterr (General_Error);
}
pid = fork ();
if (pid == -1)
return seterr (General_Error);
if (!pid)
{ /* child */
int i, n;
char errbuf[100];
int log_fd = log_get_fd ();
/* close all files which will not be duped but keep stderr
and log_stream for now */
n = sysconf (_SC_OPEN_MAX);
if (n < 0)
n = MAX_OPEN_FDS;
for (i=0; i < n; i++)
{
if (i != fileno (stderr) && i != log_fd
&& i != inpipe[1] && i != outpipe[0])
close(i);
}
errno = 0;
if (inpipe[1] != 1)
{
if (dup2 (inpipe[1], 1) == -1)
{
log_error ("dup2 failed in child: %s\n", strerror (errno));
_exit (4);
}
close (inpipe[1]);
}
if (outpipe[0] != 0)
{
if (dup2 (outpipe[0], 0) == -1)
{
log_error ("dup2 failed in child: %s\n", strerror (errno));
_exit (4);
}
close (outpipe[0]);
}
/* and start it */
execl ("../agent/gpg-agent", "gpg-agent", "--server", NULL);
/* oops - tell the parent about it */
snprintf (errbuf, DIM(errbuf)-1, "ERR %d execl failed: %.50s\n",
ASSUAN_Problem_Starting_Server, strerror (errno));
errbuf[DIM(errbuf)-1] = 0;
writen (1, errbuf, strlen (errbuf));
_exit (4);
} /* end child */
agent_pid = pid;
inbound_fd = inpipe[0];
close (inpipe[1]);
close (outpipe[0]);
outbound_fd = outpipe[1];
}
else
{
infostr = xstrdup (infostr);
if ( !(p = strchr (infostr, ':')) || p == infostr
/* || (p-infostr)+1 >= sizeof client_addr.sun_path */)
{
log_error (_("malformed GPG_AGENT_INFO environment variable\n"));
xfree (infostr);
return seterr (General_Error);
}
*p = 0;
log_error (_("socket based agent communication not yet implemented\n"));
return seterr (Not_Implemented);
}
inbound.eof = 0;
inbound.linelen = 0;
inbound.attic.linelen = 0;
/* The server is available - read the greeting */
rc = read_from_agent (&okay);
if (rc)
{
log_error ("can't connect to the agent: %s\n", gnupg_strerror (rc));
}
else if (!okay)
{
log_error ("can't connect to the agent: %s\n", inbound.line);
rc = seterr (No_Agent);
}
else
log_debug ("connection to agent established\n");
return 0;
}
static int
request_reply (const char *line, struct membuf *membuf)
{
int rc, okay;
if (DBG_AGENT)
log_debug ("agent-request=`%.*s'", (int)(*line? strlen(line)-1:0), line);
rc = writen (outbound_fd, line, strlen (line));
if (rc)
return rc;
again:
rc = read_from_agent (&okay);
if (rc)
log_error ("error reading from agent: %s\n", gnupg_strerror (rc));
else if (!okay)
{
log_error ("got error from agent: %s\n", inbound.line);
rc = seterr (Agent_Error);
}
else if (okay == 2 && !membuf)
{
log_error ("got unexpected data line\n");
rc = seterr (Agent_Error);
}
else
{
if (DBG_AGENT)
log_debug ("agent-reply=`%s'", inbound.line);
}
if (!rc && okay == 2 && inbound.linelen >= 2)
{ /* handle data line */
unsigned char *buf = inbound.line;
size_t len = inbound.linelen;
unsigned char *p;
buf += 2;
len -= 2;
p = buf;
while (len)
{
for (;len && *p != '%'; len--, p++)
;
put_membuf (membuf, buf, p-buf);
buf = p;
if (len>2)
{ /* handle escaping */
unsigned char tmp[1];
buf++;
*tmp = xtoi_2 (buf);
buf += 2;
len -= 3;
put_membuf (membuf, tmp, 1);
}
}
goto again;
}
return rc;
}
/* Call the agent to do a sign operation using the key identified by
the hex string KEYGRIP. */
int
gpgsm_agent_pksign (const char *keygrip,
unsigned char *digest, size_t digestlen, int digestalgo,
char **r_buf, size_t *r_buflen )
{
int rc, i;
char *p, line[LINELENGTH];
struct membuf data;
size_t len;
*r_buf = NULL;
rc = start_agent ();
if (rc)
return rc;
if (digestlen*2 + 50 > DIM(line))
return seterr (General_Error);
rc = request_reply ("RESET\n", NULL);
if (rc)
return rc;
snprintf (line, DIM(line)-1, "SIGKEY %s\n", keygrip);
line[DIM(line)-1] = 0;
rc = request_reply (line, NULL);
if (rc)
return rc;
sprintf (line, "SETHASH %d ", digestalgo);
p = line + strlen (line);
for (i=0; i < digestlen ; i++, p += 2 )
sprintf (p, "%02X", digest[i]);
strcpy (p, "\n");
rc = request_reply (line, NULL);
if (rc)
return rc;
init_membuf (&data, 1024);
rc = request_reply ("PKSIGN\n", &data);
if (rc)
{
xfree (get_membuf (&data, &len));
return rc;
}
*r_buf = get_membuf (&data, r_buflen);
/* if (DBG_AGENT && *r_buf) */
/* { */
/* FILE *fp; */
/* char fname[100]; */
/* memcpy (fname, keygrip, 40); */
/* strcpy (fname+40, "_pksign-dump.tmp"); */
/* fp = fopen (fname, "wb"); */
/* fwrite (*r_buf, *r_buflen, 1, fp); */
/* fclose (fp); */
/* } */
return *r_buf? 0 : GNUPG_Out_Of_Core;
}

23
sm/certcheck.c
View File

@ -244,6 +244,8 @@ int
gpgsm_create_cms_signature (KsbaCert cert, GCRY_MD_HD md, int mdalgo,
char **r_sigval)
{
#if 0
/* our sample key */
const char n[] = "#8732A669BB7C5057AD070EFA54E035C86DF474F7A7EBE2435"
"3DADEB86FFE74C32AEEF9E5C6BD7584CB572520167B3E8C89A1FA75C74FF9E938"
@ -313,7 +315,26 @@ gpgsm_create_cms_signature (KsbaCert cert, GCRY_MD_HD md, int mdalgo,
assert (len);
*r_sigval = buf;
return 0;
#else
int rc;
char *grip;
size_t siglen;
grip = gpgsm_get_keygrip_hexstring (cert);
if (!grip)
return seterr (Bad_Certificate);
rc = gpgsm_agent_pksign (grip, gcry_md_read(md, mdalgo),
gcry_md_get_algo_dlen (mdalgo), mdalgo,
r_sigval, &siglen);
xfree (grip);
/* FIXME: we should check that the returnes S-Exp is valid fits int
siglen. It ould probaly be a good idea to scan and print it
again to make this sure and be sure that we have canocical
encoding */
#endif
return rc;
}

18
sm/gpgsm.h
View File

@ -18,8 +18,8 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifndef GNUPG_H
#define GNUPG_H
#ifndef GPGSM_H
#define GPGSM_H
#include <ksba.h>
#include "../common/util.h"
@ -72,12 +72,14 @@ struct {
#define DBG_CACHE_VALUE 64 /* debug the caching */
#define DBG_MEMSTAT_VALUE 128 /* show memory statistics */
#define DBG_HASHING_VALUE 512 /* debug hashing operations */
#define DBG_AGENT_VALUE 1024 /* debug communication with the agent */
#define DBG_X509 (opt.debug & DBG_X509_VALUE)
#define DBG_CRYPTO (opt.debug & DBG_CRYPTO_VALUE)
#define DBG_MEMORY (opt.debug & DBG_MEMORY_VALUE)
#define DBG_CACHE (opt.debug & DBG_CACHE_VALUE)
#define DBG_HASHING (opt.debug & DBG_HASHING_VALUE)
#define DBG_AGENT (opt.debug & DBG_AGENT_VALUE)
struct server_local_s;
@ -134,9 +136,11 @@ int gpgsm_verify (CTRL ctrl, int in_fd, int data_fd);
int gpgsm_sign (CTRL ctrl, int data_fd, int detached, FILE *out_fp);
/*-- call-agent.c --*/
int gpgsm_agent_pksign (const char *keygrip,
unsigned char *digest,
size_t digestlen,
int digestalgo,
char **r_buf, size_t *r_buflen);
/*-- errors.c (built) --*/
const char *gnupg_strerror (int err);
#endif /*GNUPG_H*/
#endif /*GPGSM_H*/

1
sm/verify.c
View File

@ -319,7 +319,6 @@ gpgsm_verify (CTRL ctrl, int in_fd, int data_fd)
unsigned char *serial;
char *msgdigest = NULL;
size_t msgdigestlen;
time_t sigcreated;
err = ksba_cms_get_issuer_serial (cms, signer, &issuer, &serial);
if (err)