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agent: Allow to pass a timestamp to genkey and import.

Browse Source 
* agent/command.c (cmd_genkey): Add option --timestamp.
(cmd_import_key): Ditto.
* agent/genkey.c (store_key): Add arg timestamp and change callers.
(agent_genkey): Ditto.
* agent/findkey.c (write_extended_private_key): Add args timestamp and
new key to write a Created line.
(agent_write_private_key): Add arg timestamp.
(agent_write_shadow_key): Ditto.
 agent/protect-tool.c (agent_write_private_key): Ditto as dummy arg.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2020-08-17 14:21:00 +02:00
parent 6bcb609e1b
commit 0da923a124
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
8 changed files with 109 additions and 38 deletions
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5
agent/agent.h
View File

@ -442,7 +442,8 @@ gpg_error_t agent_modify_description (const char *in, const char *comment,
const gcry_sexp_t key, char **result);
int agent_write_private_key (const unsigned char *grip,
const void *buffer, size_t length, int force,
const char *serialno, const char *keyref);
const char *serialno, const char *keyref,
time_t timestamp);
gpg_error_t agent_key_from_file (ctrl_t ctrl,
const char *cache_nonce,
const char *desc_text,
@ -522,7 +523,7 @@ int check_passphrase_constraints (ctrl_t ctrl, const char *pw, int no_empty,
char **failed_constraint);
gpg_error_t agent_ask_new_passphrase (ctrl_t ctrl, const char *prompt,
char **r_passphrase);
int agent_genkey (ctrl_t ctrl, const char *cache_nonce,
int agent_genkey (ctrl_t ctrl, const char *cache_nonce, time_t timestamp,
const char *keyparam, size_t keyparmlen,
int no_protection, const char *override_passphrase,
int preset, membuf_t *outbuf);

6
agent/command-ssh.c
View File

@ -3036,8 +3036,10 @@ ssh_identity_register (ctrl_t ctrl, ssh_key_type_spec_t *spec,
if (err)
goto out;
/* Store this key to our key storage. */
err = agent_write_private_key (key_grip_raw, buffer, buffer_n, 0, NULL, NULL);
/* Store this key to our key storage. We do not store a creation
* timestamp because we simply do not know. */
err = agent_write_private_key (key_grip_raw, buffer, buffer_n, 0,
NULL, NULL, 0);
if (err)
goto out;

66
agent/command.c
View File

@ -928,8 +928,8 @@ cmd_pkdecrypt (assuan_context_t ctx, char *line)
static const char hlp_genkey[] =
"GENKEY [--no-protection] [--preset] [--inq-passwd]\n"
" [--passwd-nonce=<s>] [<cache_nonce>]\n"
"GENKEY [--no-protection] [--preset] [--timestamp=<isodate>]\n"
" [--inq-passwd] [--passwd-nonce=<s>] [<cache_nonce>]\n"
"\n"
"Generate a new key, store the secret part and return the public\n"
"part. Here is an example transaction:\n"
@ -942,11 +942,13 @@ static const char hlp_genkey[] =
" S: D (rsa (n 326487324683264) (e 10001)))\n"
" S: OK key created\n"
"\n"
"When the --preset option is used the passphrase for the generated\n"
"key will be added to the cache. When --inq-passwd is used an inquire\n"
"If the --preset option is used the passphrase for the generated\n"
"key will be added to the cache. If --inq-passwd is used an inquire\n"
"with the keyword NEWPASSWD is used to request the passphrase for the\n"
"new key. When a --passwd-nonce is used, the corresponding cached\n"
"passphrase is used to protect the new key.";
"new key. If a --passwd-nonce is used, the corresponding cached\n"
"passphrase is used to protect the new key. If --timestamp is given\n"
"its value is recorded as the key's creation time; the value is\n"
"expected in ISO format (e.g. \"20030316T120000\").";
static gpg_error_t
cmd_genkey (assuan_context_t ctx, char *line)
{
@ -963,6 +965,8 @@ cmd_genkey (assuan_context_t ctx, char *line)
int opt_inq_passwd;
size_t n;
char *p, *pend;
const char *s;
time_t opt_timestamp;
int c;
if (ctrl->restricted)
@ -986,6 +990,22 @@ cmd_genkey (assuan_context_t ctx, char *line)
goto leave;
}
}
if ((s=has_option_name (line, "--timestamp")))
{
if (*s != '=')
{
rc = set_error (GPG_ERR_ASS_PARAMETER, "missing value for option");
goto leave;
}
opt_timestamp = isotime2epoch (s+1);
if (opt_timestamp < 1)
{
rc = set_error (GPG_ERR_ASS_PARAMETER, "invalid time value");
goto leave;
}
}
else
opt_timestamp = 0;
line = skip_options (line);
for (p=line; *p && *p != ' ' && *p != '\t'; p++)
@ -1027,7 +1047,8 @@ cmd_genkey (assuan_context_t ctx, char *line)
else if (passwd_nonce)
newpasswd = agent_get_cache (ctrl, passwd_nonce, CACHE_MODE_NONCE);
rc = agent_genkey (ctrl, cache_nonce, (char*)value, valuelen, no_protection,
rc = agent_genkey (ctrl, cache_nonce, opt_timestamp,
(char*)value, valuelen, no_protection,
newpasswd, opt_preset, &outbuf);
leave:
@ -2321,7 +2342,8 @@ cmd_keywrap_key (assuan_context_t ctx, char *line)
static const char hlp_import_key[] =
"IMPORT_KEY [--unattended] [--force] [<cache_nonce>]\n"
"IMPORT_KEY [--unattended] [--force] [--timestamp=<isodate>]\n"
" [<cache_nonce>]\n"
"\n"
"Import a secret key into the key store. The key is expected to be\n"
"encrypted using the current session's key wrapping key (cf. command\n"
@ -2329,13 +2351,16 @@ static const char hlp_import_key[] =
"no arguments but uses the inquiry \"KEYDATA\" to ask for the actual\n"
"key data. The unwrapped key must be a canonical S-expression. The\n"
"option --unattended tries to import the key as-is without any\n"
"re-encryption. Existing key can be overwritten with --force.";
"re-encryption. An existing key can be overwritten with --force.\n"
"If --timestamp is given its value is recorded as the key's creation\n"
"time; the value is expected in ISO format (e.g. \"20030316T120000\").";
static gpg_error_t
cmd_import_key (assuan_context_t ctx, char *line)
{
ctrl_t ctrl = assuan_get_pointer (ctx);
gpg_error_t err;
int opt_unattended;
time_t opt_timestamp;
int force;
unsigned char *wrappedkey = NULL;
size_t wrappedkeylen;
@ -2349,6 +2374,7 @@ cmd_import_key (assuan_context_t ctx, char *line)
gcry_sexp_t openpgp_sexp = NULL;
char *cache_nonce = NULL;
char *p;
const char *s;
if (ctrl->restricted)
return leave_cmd (ctx, gpg_error (GPG_ERR_FORBIDDEN));
@ -2361,6 +2387,22 @@ cmd_import_key (assuan_context_t ctx, char *line)
opt_unattended = has_option (line, "--unattended");
force = has_option (line, "--force");
if ((s=has_option_name (line, "--timestamp")))
{
if (*s != '=')
{
err = set_error (GPG_ERR_ASS_PARAMETER, "missing value for option");
goto leave;
}
opt_timestamp = isotime2epoch (s+1);
if (opt_timestamp < 1)
{
err = set_error (GPG_ERR_ASS_PARAMETER, "invalid time value");
goto leave;
}
}
else
opt_timestamp = 0;
line = skip_options (line);
for (p=line; *p && *p != ' ' && *p != '\t'; p++)
@ -2434,7 +2476,6 @@ cmd_import_key (assuan_context_t ctx, char *line)
goto leave; /* Note that ERR is still set. */
}
if (openpgp_sexp)
{
/* In most cases the key is encrypted and thus the conversion
@ -2499,10 +2540,11 @@ cmd_import_key (assuan_context_t ctx, char *line)
ctrl->s2k_count, -1);
if (!err)
err = agent_write_private_key (grip, finalkey, finalkeylen, force,
NULL, NULL);
NULL, NULL, opt_timestamp);
}
else
err = agent_write_private_key (grip, key, realkeylen, force, NULL, NULL);
err = agent_write_private_key (grip, key, realkeylen, force, NULL, NULL,
opt_timestamp);
leave:
gcry_sexp_release (openpgp_sexp);

4
agent/cvt-openpgp.c
View File

@ -1114,7 +1114,7 @@ convert_from_openpgp_native (ctrl_t ctrl,
&protectedkey, &protectedkeylen,
ctrl->s2k_count, -1))
agent_write_private_key (grip, protectedkey, protectedkeylen, 1,
NULL, NULL);
NULL, NULL, 0);
xfree (protectedkey);
}
else
@ -1123,7 +1123,7 @@ convert_from_openpgp_native (ctrl_t ctrl,
agent_write_private_key (grip,
*r_key,
gcry_sexp_canon_len (*r_key, 0, NULL,NULL),
1, NULL, NULL);
1, NULL, NULL, 0);
}
}

41
agent/findkey.c
View File

@ -82,9 +82,10 @@ linefeed_to_percent0A (const char *string)
/* Note: Ownership of FNAME and FP are moved to this function. */
static gpg_error_t
write_extended_private_key (char *fname, estream_t fp, int update,
write_extended_private_key (char *fname, estream_t fp, int update, int newkey,
const void *buf, size_t len,
const char *serialno, const char *keyref)
const char *serialno, const char *keyref,
time_t timestamp)
{
gpg_error_t err;
nvc_t pk = NULL;
@ -153,6 +154,19 @@ write_extended_private_key (char *fname, estream_t fp, int update,
}
}
/* If a timestamp has been supplied and the key is new write a
* creation timestamp. (We douple check that there is no Created
* item yet.)*/
if (timestamp && newkey && !nvc_lookup (pk, "Created:"))
{
gnupg_isotime_t timebuf;
epoch2isotime (timebuf, timestamp);
err = nvc_add (pk, "Created:", timebuf);
if (err)
goto leave;
}
err = es_fseek (fp, 0, SEEK_SET);
if (err)
@ -199,12 +213,15 @@ write_extended_private_key (char *fname, estream_t fp, int update,
/* Write an S-expression formatted key to our key storage. With FORCE
* passed as true an existing key with the given GRIP will get
* overwritten. If SERIALNO and KEYREF are given a Token line is added to
* the key if the extended format is used. */
* overwritten. If SERIALNO and KEYREF are given a Token line is
* added to the key if the extended format is used. If TIMESTAMP is
* not zero and the key doies not yet exists it will be recorded as
* creation date. */
int
agent_write_private_key (const unsigned char *grip,
const void *buffer, size_t length, int force,
const char *serialno, const char *keyref)
const char *serialno, const char *keyref,
time_t timestamp)
{
char *fname;
estream_t fp;
@ -272,20 +289,20 @@ agent_write_private_key (const unsigned char *grip,
if (first != '(')
{
/* Key is already in the extended format. */
return write_extended_private_key (fname, fp, 1, buffer, length,
serialno, keyref);
return write_extended_private_key (fname, fp, 1, 0, buffer, length,
serialno, keyref, timestamp);
}
if (first == '(' && opt.enable_extended_key_format)
{
/* Key is in the old format - but we want the extended format. */
return write_extended_private_key (fname, fp, 0, buffer, length,
serialno, keyref);
return write_extended_private_key (fname, fp, 0, 0, buffer, length,
serialno, keyref, timestamp);
}
}
if (opt.enable_extended_key_format)
return write_extended_private_key (fname, fp, 0, buffer, length,
serialno, keyref);
return write_extended_private_key (fname, fp, 0, 1, buffer, length,
serialno, keyref, timestamp);
if (es_fwrite (buffer, length, 1, fp) != 1)
{
@ -1552,7 +1569,7 @@ agent_write_shadow_key (const unsigned char *grip,
}
len = gcry_sexp_canon_len (shdkey, 0, NULL, NULL);
err = agent_write_private_key (grip, shdkey, len, force, serialno, keyid);
err = agent_write_private_key (grip, shdkey, len, force, serialno, keyid, 0);
xfree (shdkey);
if (err)
log_error ("error writing key: %s\n", gpg_strerror (err));

16
agent/genkey.c
View File

@ -32,7 +32,7 @@
static int
store_key (gcry_sexp_t private, const char *passphrase, int force,
unsigned long s2k_count)
unsigned long s2k_count, time_t timestamp)
{
int rc;
unsigned char *buf;
@ -67,7 +67,7 @@ store_key (gcry_sexp_t private, const char *passphrase, int force,
buf = p;
}
rc = agent_write_private_key (grip, buf, len, force, NULL, NULL);
rc = agent_write_private_key (grip, buf, len, force, NULL, NULL, timestamp);
xfree (buf);
return rc;
}
@ -423,9 +423,11 @@ agent_ask_new_passphrase (ctrl_t ctrl, const char *prompt,
KEYPARAM. If CACHE_NONCE is given first try to lookup a passphrase
using the cache nonce. If NO_PROTECTION is true the key will not
be protected by a passphrase. If OVERRIDE_PASSPHRASE is true that
passphrase will be used for the new key. */
passphrase will be used for the new key. If TIMESTAMP is not zero
it will be recorded as creation date of the key (unless extended
format is disabled) . */
int
agent_genkey (ctrl_t ctrl, const char *cache_nonce,
agent_genkey (ctrl_t ctrl, const char *cache_nonce, time_t timestamp,
const char *keyparam, size_t keyparamlen, int no_protection,
const char *override_passphrase, int preset, membuf_t *outbuf)
{
@ -499,7 +501,7 @@ agent_genkey (ctrl_t ctrl, const char *cache_nonce,
/* store the secret key */
if (DBG_CRYPTO)
log_debug ("storing private key\n");
rc = store_key (s_private, passphrase, 0, ctrl->s2k_count);
rc = store_key (s_private, passphrase, 0, ctrl->s2k_count, timestamp);
if (!rc)
{
if (!cache_nonce)
@ -573,7 +575,7 @@ agent_protect_and_store (ctrl_t ctrl, gcry_sexp_t s_skey,
{
/* Take an empty string as request not to protect the key. */
err = store_key (s_skey, **passphrase_addr? *passphrase_addr:NULL, 1,
ctrl->s2k_count);
ctrl->s2k_count, 0);
}
else
{
@ -588,7 +590,7 @@ agent_protect_and_store (ctrl_t ctrl, gcry_sexp_t s_skey,
L_("Please enter the new passphrase"),
&pass);
if (!err)
err = store_key (s_skey, pass, 1, ctrl->s2k_count);
err = store_key (s_skey, pass, 1, ctrl->s2k_count, 0);
if (!err && passphrase_addr)
*passphrase_addr = pass;
else

5
agent/keyformat.txt
View File

@ -86,6 +86,11 @@ Format' (GCRYSEXP_FMT_ADVANCED) that avoids non-printable characters
so that the file can be easily inspected and edited. See section
'Private Key Format' below for details.
*** Created
The UTC time the key was created in ISO compressed format
(yyyymmddThhmmss). This informarion can be used to re-create an
OpenPGP key.
*** Label
This is a short human readable description for the key which can be
used by the software to describe the key in a user interface. For

4
agent/protect-tool.c
View File

@ -816,7 +816,8 @@ agent_askpin (ctrl_t ctrl,
int
agent_write_private_key (const unsigned char *grip,
const void *buffer, size_t length, int force,
const char *serialno, const char *keyref)
const char *serialno, const char *keyref,
time_t timestamp)
{
char hexgrip[40+4+1];
char *p;
@ -824,6 +825,7 @@ agent_write_private_key (const unsigned char *grip,
(void)force;
(void)serialno;
(void)keyref;
(void)timestamp;
bin2hex (grip, 20, hexgrip);
strcpy (hexgrip+40, ".key");