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Fix usage of SHA-2 algorithm with OpenPGP cards.

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This was a regression in 2.1 introduced due to having the agent do the
signing in contrast to the old "SCD PKSIGN" command which accesses the
scdaemon directly and passed the hash algorithm.  The hash algorithm
is used by app-openpgp.c only for a sanity check.
This commit is contained in:
Werner Koch 2011-03-02 15:35:10 +01:00
parent b7f74f5b46
commit 1c09def22d
7 changed files with 39 additions and 154 deletions
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5
agent/ChangeLog
View File

@ -1,3 +1,8 @@
2011-03-02 Werner Koch <wk@g10code.com>
* call-scd.c (hash_algo_option): New.
(agent_card_pksign): Use it with PKSIGN.
2011-03-02 Ben Kibbey <bjk@luxsci.net> (wk)
* command.c (cmd_clear_passphrase): Add option --mode=normal.

1
agent/agent.h
View File

@ -365,6 +365,7 @@ int agent_card_pksign (ctrl_t ctrl,
const char *keyid,
int (*getpin_cb)(void *, const char *, char*, size_t),
void *getpin_cb_arg,
int mdalgo,
const unsigned char *indata, size_t indatalen,
unsigned char **r_buf, size_t *r_buflen);
int agent_card_pkdecrypt (ctrl_t ctrl,

30
agent/call-scd.c
View File

@ -796,13 +796,33 @@ inq_needpin (void *opaque, const char *line)
}
/* Helper returning a command option to describe the used hash
algorithm. See scd/command.c:cmd_pksign. */
static const char *
hash_algo_option (int algo)
{
switch (algo)
{
case GCRY_MD_MD5 : return "--hash=md5";
case GCRY_MD_RMD160: return "--hash=rmd160";
case GCRY_MD_SHA1 : return "--hash=sha1";
case GCRY_MD_SHA224: return "--hash=sha224";
case GCRY_MD_SHA256: return "--hash=sha256";
case GCRY_MD_SHA384: return "--hash=sha384";
case GCRY_MD_SHA512: return "--hash=sha512";
default: return "";
}
}
/* Create a signature using the current card */
/* Create a signature using the current card. MDALGO is either 0 or
gives the digest algorithm. */
int
agent_card_pksign (ctrl_t ctrl,
const char *keyid,
int (*getpin_cb)(void *, const char *, char*, size_t),
void *getpin_cb_arg,
int mdalgo,
const unsigned char *indata, size_t indatalen,
unsigned char **r_buf, size_t *r_buflen)
{
@ -837,9 +857,11 @@ agent_card_pksign (ctrl_t ctrl,
inqparm.getpin_cb = getpin_cb;
inqparm.getpin_cb_arg = getpin_cb_arg;
inqparm.passthru = 0;
snprintf (line, DIM(line)-1,
ctrl->use_auth_call? "PKAUTH %s":"PKSIGN %s", keyid);
line[DIM(line)-1] = 0;
if (ctrl->use_auth_call)
snprintf (line, sizeof line, "PKAUTH %s", keyid);
else
snprintf (line, sizeof line, "PKSIGN %s %s",
hash_algo_option (mdalgo), keyid);
rc = assuan_transact (ctrl->scd_local->ctx, line,
membuf_data_cb, &data,
inq_needpin, &inqparm,

4
agent/divert-scd.c
View File

@ -347,7 +347,7 @@ divert_pksign (ctrl_t ctrl,
int save = ctrl->use_auth_call;
ctrl->use_auth_call = 1;
rc = agent_card_pksign (ctrl, kid, getpin_cb, ctrl,
digest, digestlen, &sigval, &siglen);
algo, digest, digestlen, &sigval, &siglen);
ctrl->use_auth_call = save;
}
else
@ -359,7 +359,7 @@ divert_pksign (ctrl_t ctrl,
if (!rc)
{
rc = agent_card_pksign (ctrl, kid, getpin_cb, ctrl,
data, ndata, &sigval, &siglen);
algo, data, ndata, &sigval, &siglen);
xfree (data);
}
}

5
g10/ChangeLog
View File

@ -1,3 +1,8 @@
2011-03-02 Werner Koch <wk@g10code.com>
* call-agent.c (agent_scd_pksign, agent_scd_pkdecrypt)
(hash_algo_option): Remove these unused functions.
2011-02-10 Werner Koch <wk@g10code.com>
* seskey.c (encode_md_value): Change last fix to avoid a

138
g10/call-agent.c
View File

@ -914,144 +914,6 @@ membuf_data_cb (void *opaque, const void *buffer, size_t length)
}
/* Helper returning a command option to describe the used hash
algorithm. See scd/command.c:cmd_pksign. */
static const char *
hash_algo_option (int algo)
{
switch (algo)
{
case GCRY_MD_RMD160: return "--hash=rmd160";
case GCRY_MD_SHA1 : return "--hash=sha1";
case GCRY_MD_SHA224: return "--hash=sha224";
case GCRY_MD_SHA256: return "--hash=sha256";
case GCRY_MD_SHA384: return "--hash=sha384";
case GCRY_MD_SHA512: return "--hash=sha512";
case GCRY_MD_MD5 : return "--hash=md5";
default: return "";
}
}
/* Send a sign command to the scdaemon via gpg-agent's pass thru
mechanism. */
int
agent_scd_pksign (const char *serialno, int hashalgo,
const unsigned char *indata, size_t indatalen,
unsigned char **r_buf, size_t *r_buflen)
{
int rc;
char line[ASSUAN_LINELENGTH];
membuf_t data;
size_t len;
/* Note, hashalgo is not yet used but hardwired to SHA1 in SCdaemon. */
*r_buf = NULL;
*r_buflen = 0;
rc = start_agent (NULL, 1);
if (gpg_err_code (rc) == GPG_ERR_CARD_NOT_PRESENT
|| gpg_err_code (rc) == GPG_ERR_NOT_SUPPORTED)
rc = 0; /* We check later. */
if (rc)
return rc;
if (indatalen*2 + 50 > DIM(line))
return gpg_error (GPG_ERR_GENERAL);
rc = select_openpgp (serialno);
if (rc)
return rc;
strcpy (line, "SCD SETDATA ");
bin2hex (indata, indatalen, line + strlen (line));
rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return rc;
init_membuf (&data, 1024);
/* if (!hashalgo) /\* Temporary test hack. *\/ */
/* snprintf (line, DIM(line)-1, "SCD PKAUTH %s", serialno); */
/* else */
snprintf (line, DIM(line)-1, "SCD PKSIGN %s %s",
hash_algo_option (hashalgo), serialno);
line[DIM(line)-1] = 0;
rc = assuan_transact (agent_ctx, line, membuf_data_cb, &data,
default_inq_cb, NULL, NULL, NULL);
if (rc)
{
xfree (get_membuf (&data, &len));
}
else
*r_buf = get_membuf (&data, r_buflen);
status_sc_op_failure (rc);
return rc;
}
/* Decrypt INDATA of length INDATALEN using the card identified by
SERIALNO. Return the plaintext in a nwly allocated buffer stored
at the address of R_BUF.
Note, we currently support only RSA or more exactly algorithms
taking one input data element. */
int
agent_scd_pkdecrypt (const char *serialno,
const unsigned char *indata, size_t indatalen,
unsigned char **r_buf, size_t *r_buflen)
{
int rc;
char line[ASSUAN_LINELENGTH];
membuf_t data;
size_t len;
*r_buf = NULL;
rc = start_agent (NULL, 1);
if (gpg_err_code (rc) == GPG_ERR_CARD_NOT_PRESENT
|| gpg_err_code (rc) == GPG_ERR_NOT_SUPPORTED)
rc = 0; /* We check later. */
if (rc)
return rc;
/* FIXME: use secure memory where appropriate */
if (indatalen*2 + 50 > DIM(line))
return gpg_error (GPG_ERR_GENERAL);
rc = select_openpgp (serialno);
if (rc)
return rc;
strcpy (line, "SCD SETDATA ");
bin2hex (indata, indatalen, line + strlen (line));
rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return rc;
init_membuf (&data, 1024);
snprintf (line, DIM(line)-1, "SCD PKDECRYPT %s", serialno);
line[DIM(line)-1] = 0;
rc = assuan_transact (agent_ctx, line,
membuf_data_cb, &data,
default_inq_cb, NULL, NULL, NULL);
if (rc)
{
xfree (get_membuf (&data, &len));
}
else
{
*r_buf = get_membuf (&data, r_buflen);
if (!*r_buf)
rc = gpg_error (GPG_ERR_ENOMEM);
}
status_sc_op_failure (rc);
return rc;
}
/* Send a READCERT command to the SCdaemon. */

10
g10/call-agent.h
View File

@ -98,16 +98,6 @@ int agent_scd_writekey (int keyno, const char *serialno,
int agent_scd_genkey (struct agent_card_genkey_s *info, int keyno, int force,
const char *serialno, u32 createtime);
/* Send a PKSIGN command to the SCdaemon. */
int agent_scd_pksign (const char *keyid, int hashalgo,
const unsigned char *indata, size_t indatalen,
unsigned char **r_buf, size_t *r_buflen);
/* Send a PKDECRYPT command to the SCdaemon. */
int agent_scd_pkdecrypt (const char *serialno,
const unsigned char *indata, size_t indatalen,
unsigned char **r_buf, size_t *r_buflen);
/* Send a READKEY command to the SCdaemon. */
int agent_scd_readcert (const char *certidstr,
void **r_buf, size_t *r_buflen);