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scd:openpgp: Allow keygrip to be used to reference a key

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* scd/app-openpgp.c (struct app_local_s): Add keygrip_str.
(store_keygrip): New.
(read_public_key): Store the keygrip.
(get_public_key): Sitto.
(send_keypair_info): USe the stored keygrip.
(check_keyidstr): New.  Factored out from other functions and
extended.
(do_sign): Use check_keyidstr.
(do_auth): Ditto.
(do_decipher): Ditto.
(do_check_pin): Ditto.
--

This code is a backport of commits:

b0f0791e4ade845b2a0e2a94dbda4f3bf1ceb039
cd: Factor out a function to check keyidstr.

4c4999b8185ace55eb5f3a6fa7d3dc0a77267b63
scd:openpgp: Allow PKSIGN with keygrip also for OPENPGP.3.

e769609cd3c12d2e26955538399172016f78d2d4
scd: Allow KEYGRIP as KEYIDSTR.

Co-authored-by: NIIBE Yutaka <gniibe@fsij.org>
Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2020-11-16 17:05:27 +01:00
parent 5d98f95aa9
commit 1049f06c6d
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
1 changed files with 129 additions and 141 deletions
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262
scd/app-openpgp.c
View File

@ -1,6 +1,7 @@
/* app-openpgp.c - The OpenPGP card application.
* Copyright (C) 2003, 2004, 2005, 2007, 2008,
* 2009, 2013, 2014, 2015 Free Software Foundation, Inc.
* Copyright (C) 2003-2005, 2007-2009,
* 2013-2015 Free Software Foundation, Inc.
* Copyright (C) 2003-2005, 2007-2009, 2013-2015, 2020 g10 Code GmbH
*
* This file is part of GnuPG.
*
@ -176,6 +177,7 @@ struct app_local_s {
is usually only required for cross checks
because the length of an S-expression is
implicitly available. */
unsigned char keygrip_str[41]; /* The keygrip, null terminated */
} pk[3];
unsigned char status_indicator; /* The card status indicator. */
@ -1638,6 +1640,24 @@ ecc_read_pubkey (app_t app, ctrl_t ctrl, u32 created_at, int keyno,
}
/* Compute the keygrip form the local info and store it there. */
static gpg_error_t
store_keygrip (app_t app, int keyno)
{
gpg_error_t err;
unsigned char grip[20];
err = keygrip_from_canon_sexp (app->app_local->pk[keyno].key,
app->app_local->pk[keyno].keylen,
grip);
if (err)
return err;
bin2hex (grip, 20, app->app_local->pk[keyno].keygrip_str);
return 0;
}
/* Parse tag-length-value data for public key in BUFFER of BUFLEN
length. Key of KEYNO in APP is updated with an S-expression of
public key. When CTRL is not NULL, fingerprint is computed with
@ -1689,6 +1709,8 @@ read_public_key (app_t app, ctrl_t ctrl, u32 created_at, int keyno,
app->app_local->pk[keyno].key = keybuf;
/* Decrement for trailing '\0' */
app->app_local->pk[keyno].keylen = len - 1;
err = store_keygrip (app, keyno);
}
return err;
@ -1842,10 +1864,13 @@ get_public_key (app_t app, int keyno)
app->app_local->pk[keyno].key = (unsigned char*)keybuf;
/* Decrement for trailing '\0' */
app->app_local->pk[keyno].keylen = len - 1;
err = store_keygrip (app, keyno);
}
leave:
/* Set a flag to indicate that we tried to read the key. */
if (!err)
app->app_local->pk[keyno].read_done = 1;
xfree (buffer);
@ -1865,8 +1890,6 @@ send_keypair_info (app_t app, ctrl_t ctrl, int key)
/* Note that GnuPG 1.x does not need this and it would be too time
consuming to send it just for the fun of it. */
#if GNUPG_MAJOR_VERSION > 1
unsigned char grip[20];
char gripstr[41];
char idbuf[50];
const char *usage;
@ -1878,14 +1901,6 @@ send_keypair_info (app_t app, ctrl_t ctrl, int key)
if (!app->app_local->pk[keyno].key)
goto leave; /* No such key - ignore. */
err = keygrip_from_canon_sexp (app->app_local->pk[keyno].key,
app->app_local->pk[keyno].keylen,
grip);
if (err)
goto leave;
bin2hex (grip, 20, gripstr);
switch (keyno)
{
case 0: usage = "sc"; break;
@ -1896,7 +1911,7 @@ send_keypair_info (app_t app, ctrl_t ctrl, int key)
sprintf (idbuf, "OPENPGP.%d", keyno+1);
send_status_info (ctrl, "KEYPAIRINFO",
gripstr, 40,
app->app_local->pk[keyno].keygrip_str, 40,
idbuf, strlen (idbuf),
usage, strlen (usage),
NULL, (size_t)0);
@ -4390,6 +4405,89 @@ check_against_given_fingerprint (app_t app, const char *fpr, int key)
}
/* Check KEYIDSTR, if it's valid.
When KEYNO is 0, it means it's for PIN check.
Otherwise, KEYNO corresponds to the slot (signing, decipher and auth).
KEYIDSTR is either:
(1) Serial number
(2) Serial number "/" fingerprint
(3) Serial number "[CHV3]"
(4) keygrip
When KEYNO is 0 and KEYIDSTR is for a keygrip, the keygrip should
be to be compared is the first one (keygrip for signing).
When KEYNO is 1, KEYIDSTR is for a keygrip, and R_USE_AUTH is not
NULL, OpenPGP.1 is first tested and then OpenPGP.3. In the latter
case 1 is stored at R_USE_AUTH
*/
static int
check_keyidstr (app_t app, const char *keyidstr, int keyno, int *r_use_auth)
{
int rc;
const char *s;
int n;
const char *fpr = NULL;
if (r_use_auth)
*r_use_auth = 0;
if (strlen (keyidstr) < 32)
return gpg_error (GPG_ERR_INV_ID);
else
{
char *serial;
for (s=keyidstr, n=0; hexdigitp (s); s++, n++)
;
/* Check if it's a keygrip */
if (n == 40)
{
const unsigned char *keygrip_str;
keygrip_str = app->app_local->pk[keyno?keyno-1:0].keygrip_str;
if (!strncmp (keygrip_str, keyidstr, 40))
return 0;
else if (keyno == 1 && r_use_auth
&& !strncmp (app->app_local->pk[2].keygrip_str,
keyidstr, 40))
{
*r_use_auth = 1;
return 0;
}
else
return gpg_error (GPG_ERR_INV_ID);
}
if (n != 32 || strncmp (keyidstr, "D27600012401", 12))
return gpg_error (GPG_ERR_INV_ID);
else if (!*s)
; /* no fingerprint given: we allow this for now. */
else if (*s == '/')
fpr = s + 1;
serial = app_get_serialno (app);
if (strncmp (serial, keyidstr, 32))
{
xfree (serial);
return gpg_error (GPG_ERR_WRONG_CARD);
}
xfree (serial);
}
/* If a fingerprint has been specified check it against the one on
the card. This is allows for a meaningful error message in case
the key on the card has been replaced but the shadow information
known to gpg was not updated. If there is no fingerprint, gpg
will detect a bogus signature anyway due to the
verify-after-signing feature. */
rc = (fpr&&keyno)? check_against_given_fingerprint (app, fpr, keyno) : 0;
return rc;
}
/* Compute a digital signature on INDATA which is expected to be the
raw message digest. For this application the KEYIDSTR consists of
the serialnumber and the fingerprint delimited by a slash.
@ -4434,10 +4532,6 @@ do_sign (app_t app, const char *keyidstr, int hashalgo,
int rc;
unsigned char data[19+64];
size_t datalen;
unsigned char tmp_sn[20]; /* Actually 16 bytes but also for the fpr. */
const char *s;
int n;
const char *fpr = NULL;
unsigned long sigcount;
int use_auth = 0;
int exmode, le_value;
@ -4482,39 +4576,12 @@ do_sign (app_t app, const char *keyidstr, int hashalgo,
;
else if (!strcmp (keyidstr, "OPENPGP.3"))
use_auth = 1;
else if (strlen (keyidstr) < 32 || strncmp (keyidstr, "D27600012401", 12))
return gpg_error (GPG_ERR_INV_ID);
else
{
for (s=keyidstr, n=0; hexdigitp (s); s++, n++)
;
if (n != 32)
return gpg_error (GPG_ERR_INV_ID);
else if (!*s)
; /* no fingerprint given: we allow this for now. */
else if (*s == '/')
fpr = s + 1;
else
return gpg_error (GPG_ERR_INV_ID);
for (s=keyidstr, n=0; n < 16; s += 2, n++)
tmp_sn[n] = xtoi_2 (s);
if (app->serialnolen != 16)
return gpg_error (GPG_ERR_INV_CARD);
if (memcmp (app->serialno, tmp_sn, 16))
return gpg_error (GPG_ERR_WRONG_CARD);
}
/* If a fingerprint has been specified check it against the one on
the card. This is allows for a meaningful error message in case
the key on the card has been replaced but the shadow information
known to gpg was not updated. If there is no fingerprint, gpg
will detect a bogus signature anyway due to the
verify-after-signing feature. */
rc = fpr? check_against_given_fingerprint (app, fpr, 1) : 0;
rc = check_keyidstr (app, keyidstr, 1, &use_auth);
if (rc)
return rc;
}
/* Concatenate prefix and digest. */
#define X(a,b,d) \
@ -4630,10 +4697,6 @@ do_auth (app_t app, const char *keyidstr,
unsigned char **outdata, size_t *outdatalen )
{
int rc;
unsigned char tmp_sn[20]; /* Actually 16 but we use it also for the fpr. */
const char *s;
int n;
const char *fpr = NULL;
if (!keyidstr || !*keyidstr)
return gpg_error (GPG_ERR_INV_VALUE);
@ -4659,41 +4722,14 @@ do_auth (app_t app, const char *keyidstr,
}
/* Check whether an OpenPGP card of any version has been requested. */
if (!strcmp (keyidstr, "OPENPGP.3"))
if (!ascii_strcasecmp (keyidstr, "OPENPGP.3"))
;
else if (strlen (keyidstr) < 32 || strncmp (keyidstr, "D27600012401", 12))
return gpg_error (GPG_ERR_INV_ID);
else
{
for (s=keyidstr, n=0; hexdigitp (s); s++, n++)
;
if (n != 32)
return gpg_error (GPG_ERR_INV_ID);
else if (!*s)
; /* no fingerprint given: we allow this for now. */
else if (*s == '/')
fpr = s + 1;
else
return gpg_error (GPG_ERR_INV_ID);
for (s=keyidstr, n=0; n < 16; s += 2, n++)
tmp_sn[n] = xtoi_2 (s);
if (app->serialnolen != 16)
return gpg_error (GPG_ERR_INV_CARD);
if (memcmp (app->serialno, tmp_sn, 16))
return gpg_error (GPG_ERR_WRONG_CARD);
}
/* If a fingerprint has been specified check it against the one on
the card. This is allows for a meaningful error message in case
the key on the card has been replaced but the shadow information
known to gpg was not updated. If there is no fingerprint, gpg
will detect a bogus signature anyway due to the
verify-after-signing feature. */
rc = fpr? check_against_given_fingerprint (app, fpr, 3) : 0;
rc = check_keyidstr (app, keyidstr, 3, NULL);
if (rc)
return rc;
}
rc = verify_chv2 (app, pincb, pincb_arg);
if (!rc)
@ -4729,10 +4765,7 @@ do_decipher (app_t app, const char *keyidstr,
unsigned int *r_info)
{
int rc;
unsigned char tmp_sn[20]; /* actually 16 but we use it also for the fpr. */
const char *s;
int n;
const char *fpr = NULL;
int exmode, le_value;
unsigned char *fixbuf = NULL;
int padind = 0;
@ -4742,40 +4775,14 @@ do_decipher (app_t app, const char *keyidstr,
return gpg_error (GPG_ERR_INV_VALUE);
/* Check whether an OpenPGP card of any version has been requested. */
if (!strcmp (keyidstr, "OPENPGP.2"))
if (!ascii_strcasecmp (keyidstr, "OPENPGP.2"))
;
else if (strlen (keyidstr) < 32 || strncmp (keyidstr, "D27600012401", 12))
return gpg_error (GPG_ERR_INV_ID);
else
{
for (s=keyidstr, n=0; hexdigitp (s); s++, n++)
;
if (n != 32)
return gpg_error (GPG_ERR_INV_ID);
else if (!*s)
; /* no fingerprint given: we allow this for now. */
else if (*s == '/')
fpr = s + 1;
else
return gpg_error (GPG_ERR_INV_ID);
for (s=keyidstr, n=0; n < 16; s += 2, n++)
tmp_sn[n] = xtoi_2 (s);
if (app->serialnolen != 16)
return gpg_error (GPG_ERR_INV_CARD);
if (memcmp (app->serialno, tmp_sn, 16))
return gpg_error (GPG_ERR_WRONG_CARD);
}
/* If a fingerprint has been specified check it against the one on
the card. This is allows for a meaningful error message in case
the key on the card has been replaced but the shadow information
known to gpg was not updated. If there is no fingerprint, the
decryption won't produce the right plaintext anyway. */
rc = fpr? check_against_given_fingerprint (app, fpr, 2) : 0;
rc = check_keyidstr (app, keyidstr, 2, NULL);
if (rc)
return rc;
}
rc = verify_chv2 (app, pincb, pincb_arg);
if (rc)
@ -4990,38 +4997,19 @@ do_check_pin (app_t app, const char *keyidstr,
gpg_error_t (*pincb)(void*, const char *, char **),
void *pincb_arg)
{
unsigned char tmp_sn[20];
const char *s;
int n;
int rc;
int admin_pin = 0;
if (!keyidstr || !*keyidstr)
return gpg_error (GPG_ERR_INV_VALUE);
/* Check whether an OpenPGP card of any version has been requested. */
if (strlen (keyidstr) < 32 || strncmp (keyidstr, "D27600012401", 12))
return gpg_error (GPG_ERR_INV_ID);
rc = check_keyidstr (app, keyidstr, 0, NULL);
if (rc)
return rc;
for (s=keyidstr, n=0; hexdigitp (s); s++, n++)
;
if (n != 32)
return gpg_error (GPG_ERR_INV_ID);
else if (!*s)
; /* No fingerprint given: we allow this for now. */
else if (*s == '/')
; /* We ignore a fingerprint. */
else if (!strcmp (s, "[CHV3]") )
if ((strlen (keyidstr) >= 32+6 && !strcmp (keyidstr+32, "[CHV3]"))
|| (strlen (keyidstr) >= 40+6 && !strcmp (keyidstr+40, "[CHV3]")))
admin_pin = 1;
else
return gpg_error (GPG_ERR_INV_ID);
for (s=keyidstr, n=0; n < 16; s += 2, n++)
tmp_sn[n] = xtoi_2 (s);
if (app->serialnolen != 16)
return gpg_error (GPG_ERR_INV_CARD);
if (memcmp (app->serialno, tmp_sn, 16))
return gpg_error (GPG_ERR_WRONG_CARD);
/* Yes, there is a race conditions: The user might pull the card
right here and we won't notice that. However this is not a