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scd:p15: Factor PIN verification out to a new function.
* scd/app-p15.c (do_sign): Factor code out to ... (prepare_verify_pin, verify_pin): new functions. -- Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch
parent
c7ff8c59b9
commit
375b145487
416
scd/app-p15.c
416
scd/app-p15.c
@ -3094,6 +3094,220 @@ micardo_mse (app_t app, unsigned short fid)
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/* Prepare the verification of the PIN for the key PRKDF by checking
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* the AODF and selecting the key file. KEYREF is used for error
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* messages. */
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static gpg_error_t
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prepare_verify_pin (app_t app, const char *keyref,
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prkdf_object_t prkdf, aodf_object_t aodf)
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{
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gpg_error_t err;
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int i;
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if (opt.verbose)
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{
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log_info ("p15: using AODF %04hX id=", aodf->fid);
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for (i=0; i < aodf->objidlen; i++)
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log_printf ("%02X", aodf->objid[i]);
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log_printf ("\n");
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}
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if (aodf->authid && opt.verbose)
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log_info ("p15: PIN is controlled by another authentication token\n");
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if (aodf->pinflags.integrity_protected
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|| aodf->pinflags.confidentiality_protected)
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{
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log_error ("p15: "
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"PIN verification requires unsupported protection method\n");
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return gpg_error (GPG_ERR_BAD_PIN_METHOD);
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}
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if (!aodf->stored_length && aodf->pinflags.needs_padding)
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{
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log_error ("p15: "
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"PIN verification requires padding but no length known\n");
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return gpg_error (GPG_ERR_INV_CARD);
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}
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/* Select the key file. Note that this may change the security
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* environment thus we need to do it before PIN verification. */
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err = select_ef_by_path (app, prkdf->path, prkdf->pathlen);
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if (err)
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log_error ("p15: error selecting file for key %s: %s\n",
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keyref, gpg_strerror (err));
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return err;
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}
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/* Given the private key object PRKDF and its authentication object
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* AODF ask for the PIN and verify that PIN. */
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static gpg_error_t
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verify_pin (app_t app,
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gpg_error_t (*pincb)(void*, const char *, char **), void *pincb_arg,
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prkdf_object_t prkdf, aodf_object_t aodf)
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{
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gpg_error_t err;
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char *pinvalue;
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size_t pinvaluelen;
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const char *errstr;
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const char *s;
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int i;
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if (prkdf->usageflags.non_repudiation
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&& app->app_local->card_type == CARD_TYPE_BELPIC)
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err = pincb (pincb_arg, "PIN (qualified signature!)", &pinvalue);
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else
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err = pincb (pincb_arg, "PIN", &pinvalue);
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if (err)
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{
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log_info ("p15: PIN callback returned error: %s\n",
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gpg_strerror (err));
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return err;
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}
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/* We might need to cope with UTF8 things here. Not sure how
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min_length etc. are exactly defined, for now we take them as
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a plain octet count. */
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if (strlen (pinvalue) < aodf->min_length)
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{
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log_error ("p15: PIN is too short; minimum length is %lu\n",
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aodf->min_length);
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err = gpg_error (GPG_ERR_BAD_PIN);
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}
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else if (aodf->stored_length && strlen (pinvalue) > aodf->stored_length)
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{
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/* This would otherwise truncate the PIN silently. */
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log_error ("p15: PIN is too large; maximum length is %lu\n",
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aodf->stored_length);
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err = gpg_error (GPG_ERR_BAD_PIN);
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}
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else if (aodf->max_length_valid && strlen (pinvalue) > aodf->max_length)
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{
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log_error ("p15: PIN is too large; maximum length is %lu\n",
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aodf->max_length);
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err = gpg_error (GPG_ERR_BAD_PIN);
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}
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if (err)
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{
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xfree (pinvalue);
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return err;
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}
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errstr = NULL;
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err = 0;
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switch (aodf->pintype)
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{
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case PIN_TYPE_BCD:
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case PIN_TYPE_ASCII_NUMERIC:
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for (s=pinvalue; digitp (s); s++)
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;
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if (*s)
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{
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errstr = "Non-numeric digits found in PIN";
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err = gpg_error (GPG_ERR_BAD_PIN);
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}
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break;
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case PIN_TYPE_UTF8:
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break;
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case PIN_TYPE_HALF_NIBBLE_BCD:
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errstr = "PIN type Half-Nibble-BCD is not supported";
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break;
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case PIN_TYPE_ISO9564_1:
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errstr = "PIN type ISO9564-1 is not supported";
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break;
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default:
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errstr = "Unknown PIN type";
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break;
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}
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if (errstr)
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{
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log_error ("p15: can't verify PIN: %s\n", errstr);
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xfree (pinvalue);
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return err? err : gpg_error (GPG_ERR_BAD_PIN_METHOD);
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}
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if (aodf->pintype == PIN_TYPE_BCD )
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{
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char *paddedpin;
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int ndigits;
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for (ndigits=0, s=pinvalue; *s; ndigits++, s++)
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;
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paddedpin = xtrymalloc (aodf->stored_length+1);
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if (!paddedpin)
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{
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err = gpg_error_from_syserror ();
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xfree (pinvalue);
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return err;
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}
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i = 0;
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paddedpin[i++] = 0x20 | (ndigits & 0x0f);
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for (s=pinvalue; i < aodf->stored_length && *s && s[1]; s = s+2 )
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paddedpin[i++] = (((*s - '0') << 4) | ((s[1] - '0') & 0x0f));
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if (i < aodf->stored_length && *s)
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paddedpin[i++] = (((*s - '0') << 4)
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|((aodf->pad_char_valid?aodf->pad_char:0)&0x0f));
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if (aodf->pinflags.needs_padding)
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{
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while (i < aodf->stored_length)
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paddedpin[i++] = aodf->pad_char_valid? aodf->pad_char : 0;
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}
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xfree (pinvalue);
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pinvalue = paddedpin;
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pinvaluelen = i;
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}
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else if (aodf->pinflags.needs_padding)
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{
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char *paddedpin;
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paddedpin = xtrymalloc (aodf->stored_length+1);
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if (!paddedpin)
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{
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err = gpg_error_from_syserror ();
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xfree (pinvalue);
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return err;
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}
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for (i=0, s=pinvalue; i < aodf->stored_length && *s; i++, s++)
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paddedpin[i] = *s;
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/* Not sure what padding char to use if none has been set.
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For now we use 0x00; maybe a space would be better. */
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for (; i < aodf->stored_length; i++)
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paddedpin[i] = aodf->pad_char_valid? aodf->pad_char : 0;
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paddedpin[i] = 0;
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pinvaluelen = i;
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xfree (pinvalue);
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pinvalue = paddedpin;
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}
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else
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pinvaluelen = strlen (pinvalue);
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/* log_printhex (pinvalue, pinvaluelen, */
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/* "about to verify with ref %lu pin:", */
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/* aodf->pin_reference_valid? aodf->pin_reference : 0); */
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err = iso7816_verify (app_get_slot (app),
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aodf->pin_reference_valid? aodf->pin_reference : 0,
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pinvalue, pinvaluelen);
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xfree (pinvalue);
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if (err)
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{
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log_error ("p15: PIN verification failed: %s\n", gpg_strerror (err));
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return err;
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}
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if (opt.verbose)
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log_info ("p15: PIN verification succeeded\n");
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return 0;
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}
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/* Handler for the PKSIGN command.
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Create the signature and return the allocated result in OUTDATA.
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@ -3118,7 +3332,6 @@ do_sign (app_t app, ctrl_t ctrl, const char *keyidstr, int hashalgo,
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0x02, 0x01, 0x05, 0x00, 0x04, 0x14 };
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gpg_error_t err;
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int i;
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unsigned char data[32+19]; /* Must be large enough for a SHA-256 digest
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* + the largest OID prefix above and also
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* fit the 36 bytes of md5sha1. */
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@ -3133,7 +3346,6 @@ do_sign (app_t app, ctrl_t ctrl, const char *keyidstr, int hashalgo,
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(void)ctrl;
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log_debug ("p15:sign: keyidstr='%s' indatalen=%zu\n", keyidstr, indatalen);
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if (!keyidstr || !*keyidstr)
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return gpg_error (GPG_ERR_INV_VALUE);
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if (indatalen != 20 && indatalen != 16
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@ -3171,41 +3383,12 @@ do_sign (app_t app, ctrl_t ctrl, const char *keyidstr, int hashalgo,
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}
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if (opt.verbose)
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{
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log_info ("p15: using AODF %04hX id=", aodf->fid);
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for (i=0; i < aodf->objidlen; i++)
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log_printf ("%02X", aodf->objid[i]);
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log_printf ("\n");
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}
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if (aodf->authid && opt.verbose)
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log_info ("p15: PIN is controlled by another authentication token\n");
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if (aodf->pinflags.integrity_protected
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|| aodf->pinflags.confidentiality_protected)
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{
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log_error ("p15: "
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"PIN verification requires unsupported protection method\n");
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return gpg_error (GPG_ERR_BAD_PIN_METHOD);
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}
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if (!aodf->stored_length && aodf->pinflags.needs_padding)
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{
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log_error ("p15: "
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"PIN verification requires padding but no length known\n");
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return gpg_error (GPG_ERR_INV_CARD);
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}
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/* Select the key file. Note that this may change the security
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environment thus we do it before PIN verification. */
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err = select_ef_by_path (app, prkdf->path, prkdf->pathlen);
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/* Prepare PIN verification. This is split so that we can do
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* MSE operation for some task after having selected the key file but
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* before sending the verify APDU. */
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err = prepare_verify_pin (app, keyidstr, prkdf, aodf);
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if (err)
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{
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log_error ("p15: error selecting file for key %s: %s\n",
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keyidstr, gpg_strerror (errno));
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return err;
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}
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return err;
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/* Due to the fact that the non-repudiation signature on a BELPIC
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card requires a verify immediately before the DSO we set the
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@ -3237,163 +3420,12 @@ do_sign (app_t app, ctrl_t ctrl, const char *keyidstr, int hashalgo,
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return err;
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}
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/* Now that we have all the information available run the actual PIN
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* verification.*/
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err = verify_pin (app, pincb, pincb_arg, prkdf, aodf);
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if (err)
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return err;
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/* Now that we have all the information available, prepare and run
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the PIN verification.*/
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if (1)
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{
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char *pinvalue;
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size_t pinvaluelen;
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const char *errstr;
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const char *s;
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if (prkdf->usageflags.non_repudiation
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&& app->app_local->card_type == CARD_TYPE_BELPIC)
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err = pincb (pincb_arg, "PIN (qualified signature!)", &pinvalue);
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else
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err = pincb (pincb_arg, "PIN", &pinvalue);
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if (err)
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{
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log_info ("p15: PIN callback returned error: %s\n",
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gpg_strerror (err));
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return err;
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}
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/* We might need to cope with UTF8 things here. Not sure how
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min_length etc. are exactly defined, for now we take them as
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a plain octet count. */
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if (strlen (pinvalue) < aodf->min_length)
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{
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log_error ("p15: PIN is too short; minimum length is %lu\n",
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aodf->min_length);
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err = gpg_error (GPG_ERR_BAD_PIN);
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}
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else if (aodf->stored_length && strlen (pinvalue) > aodf->stored_length)
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{
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/* This would otherwise truncate the PIN silently. */
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log_error ("p15: PIN is too large; maximum length is %lu\n",
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aodf->stored_length);
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err = gpg_error (GPG_ERR_BAD_PIN);
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}
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else if (aodf->max_length_valid && strlen (pinvalue) > aodf->max_length)
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{
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log_error ("p15: PIN is too large; maximum length is %lu\n",
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aodf->max_length);
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err = gpg_error (GPG_ERR_BAD_PIN);
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}
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if (err)
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{
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xfree (pinvalue);
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return err;
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}
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errstr = NULL;
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err = 0;
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switch (aodf->pintype)
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{
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case PIN_TYPE_BCD:
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case PIN_TYPE_ASCII_NUMERIC:
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for (s=pinvalue; digitp (s); s++)
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;
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if (*s)
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{
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errstr = "Non-numeric digits found in PIN";
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err = gpg_error (GPG_ERR_BAD_PIN);
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}
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break;
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case PIN_TYPE_UTF8:
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break;
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case PIN_TYPE_HALF_NIBBLE_BCD:
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errstr = "PIN type Half-Nibble-BCD is not supported";
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break;
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case PIN_TYPE_ISO9564_1:
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errstr = "PIN type ISO9564-1 is not supported";
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break;
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default:
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errstr = "Unknown PIN type";
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break;
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}
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if (errstr)
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{
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log_error ("p15: can't verify PIN: %s\n", errstr);
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xfree (pinvalue);
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return err? err : gpg_error (GPG_ERR_BAD_PIN_METHOD);
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}
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if (aodf->pintype == PIN_TYPE_BCD )
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{
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char *paddedpin;
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int ndigits;
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for (ndigits=0, s=pinvalue; *s; ndigits++, s++)
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;
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paddedpin = xtrymalloc (aodf->stored_length+1);
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if (!paddedpin)
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{
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err = gpg_error_from_syserror ();
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xfree (pinvalue);
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return err;
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}
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i = 0;
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paddedpin[i++] = 0x20 | (ndigits & 0x0f);
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for (s=pinvalue; i < aodf->stored_length && *s && s[1]; s = s+2 )
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paddedpin[i++] = (((*s - '0') << 4) | ((s[1] - '0') & 0x0f));
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if (i < aodf->stored_length && *s)
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paddedpin[i++] = (((*s - '0') << 4)
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|((aodf->pad_char_valid?aodf->pad_char:0)&0x0f));
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if (aodf->pinflags.needs_padding)
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while (i < aodf->stored_length)
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paddedpin[i++] = aodf->pad_char_valid? aodf->pad_char : 0;
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xfree (pinvalue);
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pinvalue = paddedpin;
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pinvaluelen = i;
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}
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else if (aodf->pinflags.needs_padding)
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{
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char *paddedpin;
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paddedpin = xtrymalloc (aodf->stored_length+1);
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if (!paddedpin)
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{
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err = gpg_error_from_syserror ();
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xfree (pinvalue);
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return err;
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}
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for (i=0, s=pinvalue; i < aodf->stored_length && *s; i++, s++)
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paddedpin[i] = *s;
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/* Not sure what padding char to use if none has been set.
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For now we use 0x00; maybe a space would be better. */
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for (; i < aodf->stored_length; i++)
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paddedpin[i] = aodf->pad_char_valid? aodf->pad_char : 0;
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paddedpin[i] = 0;
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pinvaluelen = i;
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xfree (pinvalue);
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pinvalue = paddedpin;
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}
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else
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pinvaluelen = strlen (pinvalue);
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log_printhex (pinvalue, pinvaluelen,
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"about to verify with ref %lu pin:",
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aodf->pin_reference_valid? aodf->pin_reference : 0);
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err = iso7816_verify (app_get_slot (app),
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aodf->pin_reference_valid? aodf->pin_reference : 0,
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pinvalue, pinvaluelen);
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xfree (pinvalue);
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if (err)
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{
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log_error ("p15: PIN verification failed: %s\n", gpg_strerror (err));
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return err;
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}
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if (opt.verbose)
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log_info ("p15: PIN verification succeeded\n");
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}
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/* Prepare the DER object from INDATA. */
|
||||
if (indatalen == 36)
|
||||
|
||||
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Reference in New Issue
Block a user