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dirmngr: Remove use of hardcoded numbers in validate.
* dirmngr/validate.c (enum cert_usage_modes): New. (cert_usage_p): Change type of arg MODE. Use enums instead of hardwired values. Use a switch instead of tricky bit tests. (cert_use_cert_p, cert_use_ocsp_p, cert_use_crl_p): Adjust. * dirmngr/validate.c (cert_usage_p): Rename to check_cert_usage. (cert_use_cert_p): Rename to check_cert_use_cert. (cert_use_ocsp_p): Rename to check_cert_use_ocsp. (cert_use_crl_p): Rename to check_cert_use_crl. * dirmngr/validate.h (VALIDATE_MODE_CERT_SYSTRUST): New. (VALIDATE_MODE_TLS, VALIDATE_MODE_TLS_SYSTRUST): New. -- A function with a "_p" suffix return 0 for a True just looks weird. We now use names which better indicate that an error code is returned. Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch
parent
dea4b3c742
commit
ed99af030d
@ -1,6 +1,6 @@
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/* validate.c - Validate a certificate chain.
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* Copyright (C) 2001, 2003, 2004, 2008 Free Software Foundation, Inc.
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* Copyright (C) 2004, 2006, 2008 g10 Code GmbH
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* Copyright (C) 2004, 2006, 2008, 2017 g10 Code GmbH
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*
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* This file is part of DirMngr.
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*
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@ -33,6 +33,20 @@
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#include "validate.h"
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#include "misc.h"
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/* Mode parameters for cert_check_usage(). */
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enum cert_usage_modes
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{
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CERT_USAGE_MODE_SIGN, /* Usable for encryption. */
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CERT_USAGE_MODE_ENCR, /* Usable for signing. */
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CERT_USAGE_MODE_VRFY, /* Usable for verification. */
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CERT_USAGE_MODE_DECR, /* Usable for decryption. */
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CERT_USAGE_MODE_CERT, /* Usable for cert signing. */
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CERT_USAGE_MODE_OCSP, /* Usable for OCSP respone signing. */
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CERT_USAGE_MODE_CRL /* Usable for CRL signing. */
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};
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/* While running the validation function we need to keep track of the
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certificates and the validation outcome of each. We use this type
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for it. */
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@ -394,11 +408,11 @@ validate_cert_chain (ctrl_t ctrl, ksba_cert_t cert, ksba_isotime_t r_exptime,
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switch (mode)
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{
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case VALIDATE_MODE_OCSP:
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err = cert_use_ocsp_p (cert);
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err = check_cert_use_ocsp (cert);
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break;
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case VALIDATE_MODE_CRL:
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case VALIDATE_MODE_CRL_RECURSIVE:
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err = cert_use_crl_p (cert);
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err = check_cert_use_crl (cert);
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break;
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default:
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err = 0;
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@ -694,7 +708,7 @@ validate_cert_chain (ctrl_t ctrl, ksba_cert_t cert, ksba_isotime_t r_exptime,
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}
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/* May that certificate be used for certification? */
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err = cert_use_cert_p (issuer_cert);
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err = check_cert_use_cert (issuer_cert);
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if (err)
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goto leave; /* No. */
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@ -1001,13 +1015,9 @@ check_cert_sig (ksba_cert_t issuer_cert, ksba_cert_t cert)
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/* Return 0 if the cert is usable for encryption. A MODE of 0 checks
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for signing, a MODE of 1 checks for encryption, a MODE of 2 checks
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for verification and a MODE of 3 for decryption (just for
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debugging). MODE 4 is for certificate signing, MODE 5 for OCSP
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response signing, MODE 6 is for CRL signing. */
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static int
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cert_usage_p (ksba_cert_t cert, int mode)
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/* Return 0 if CERT is usable for MODE. */
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static gpg_error_t
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check_cert_usage (ksba_cert_t cert, enum cert_usage_modes mode)
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{
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gpg_error_t err;
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unsigned int use;
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@ -1077,7 +1087,8 @@ cert_usage_p (ksba_cert_t cert, int mode)
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if (gpg_err_code (err) == GPG_ERR_NO_DATA)
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{
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err = 0;
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if (opt.verbose && mode < 2)
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if (opt.verbose && (mode == CERT_USAGE_MODE_SIGN
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|| mode == CERT_USAGE_MODE_ENCR))
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log_info (_("no key usage specified - assuming all usages\n"));
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use = ~0;
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}
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@ -1094,17 +1105,36 @@ cert_usage_p (ksba_cert_t cert, int mode)
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return err;
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}
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if (mode == 4)
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switch (mode)
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{
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case CERT_USAGE_MODE_SIGN:
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case CERT_USAGE_MODE_VRFY:
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if ((use & (KSBA_KEYUSAGE_DIGITAL_SIGNATURE
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| KSBA_KEYUSAGE_NON_REPUDIATION)))
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return 0;
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log_info (mode == CERT_USAGE_MODE_VRFY
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? _("certificate should not have been used for signing\n")
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: _("certificate is not usable for signing\n"));
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break;
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case CERT_USAGE_MODE_ENCR:
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case CERT_USAGE_MODE_DECR:
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if ((use & (KSBA_KEYUSAGE_KEY_ENCIPHERMENT
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| KSBA_KEYUSAGE_DATA_ENCIPHERMENT)))
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return 0;
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log_info (mode == CERT_USAGE_MODE_DECR
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? _("certificate should not have been used for encryption\n")
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: _("certificate is not usable for encryption\n"));
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break;
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case CERT_USAGE_MODE_CERT:
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if ((use & (KSBA_KEYUSAGE_KEY_CERT_SIGN)))
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return 0;
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log_info (_("certificate should not have "
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"been used for certification\n"));
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return gpg_error (GPG_ERR_WRONG_KEY_USAGE);
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}
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break;
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if (mode == 5)
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{
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case CERT_USAGE_MODE_OCSP:
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if (use != ~0
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&& (have_ocsp_signing
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|| (use & (KSBA_KEYUSAGE_KEY_CERT_SIGN
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@ -1112,50 +1142,38 @@ cert_usage_p (ksba_cert_t cert, int mode)
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return 0;
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log_info (_("certificate should not have "
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"been used for OCSP response signing\n"));
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return gpg_error (GPG_ERR_WRONG_KEY_USAGE);
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}
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break;
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if (mode == 6)
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{
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case CERT_USAGE_MODE_CRL:
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if ((use & (KSBA_KEYUSAGE_CRL_SIGN)))
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return 0;
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log_info (_("certificate should not have "
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"been used for CRL signing\n"));
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return gpg_error (GPG_ERR_WRONG_KEY_USAGE);
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break;
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}
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if ((use & ((mode&1)?
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(KSBA_KEYUSAGE_KEY_ENCIPHERMENT|KSBA_KEYUSAGE_DATA_ENCIPHERMENT):
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(KSBA_KEYUSAGE_DIGITAL_SIGNATURE|KSBA_KEYUSAGE_NON_REPUDIATION)))
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)
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return 0;
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log_info (mode==3? _("certificate should not have been used "
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"for encryption\n"):
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mode==2? _("certificate should not have been used for signing\n"):
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mode==1? _("certificate is not usable for encryption\n"):
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_("certificate is not usable for signing\n"));
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return gpg_error (GPG_ERR_WRONG_KEY_USAGE);
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}
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/* Return 0 if the certificate CERT is usable for certification. */
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gpg_error_t
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cert_use_cert_p (ksba_cert_t cert)
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check_cert_use_cert (ksba_cert_t cert)
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{
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return cert_usage_p (cert, 4);
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return check_cert_usage (cert, CERT_USAGE_MODE_CERT);
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}
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/* Return 0 if the certificate CERT is usable for signing OCSP
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responses. */
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gpg_error_t
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cert_use_ocsp_p (ksba_cert_t cert)
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check_cert_use_ocsp (ksba_cert_t cert)
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{
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return cert_usage_p (cert, 5);
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return check_cert_usage (cert, CERT_USAGE_MODE_OCSP);
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}
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/* Return 0 if the certificate CERT is usable for signing CRLs. */
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gpg_error_t
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cert_use_crl_p (ksba_cert_t cert)
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check_cert_use_crl (ksba_cert_t cert)
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{
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return cert_usage_p (cert, 6);
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return check_cert_usage (cert, CERT_USAGE_MODE_CRL);
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}
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@ -25,13 +25,27 @@
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enum {
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/* Simple certificate validation mode. */
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VALIDATE_MODE_CERT = 0,
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/* Same as MODE_CERT but using the system provided root
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* certificates. */
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VALIDATE_MODE_CERT_SYSTRUST,
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/* Same as MODE_CERT but uses a provided list of certificates. */
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VALIDATE_MODE_TLS,
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/* Same as MODE_TLS but using the system provided root
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* certificates. */
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VALIDATE_MODE_TLS_SYSTRUST,
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/* Standard CRL issuer certificate validation; i.e. CRLs are not
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considered for CRL issuer certificates. */
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VALIDATE_MODE_CRL = 1,
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VALIDATE_MODE_CRL,
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/* Full CRL validation. */
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VALIDATE_MODE_CRL_RECURSIVE = 2,
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VALIDATE_MODE_CRL_RECURSIVE,
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/* Validation as used for OCSP. */
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VALIDATE_MODE_OCSP = 3
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VALIDATE_MODE_OCSP
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};
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@ -42,14 +56,14 @@ gpg_error_t validate_cert_chain (ctrl_t ctrl,
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int mode, char **r_trust_anchor);
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/* Return 0 if the certificate CERT is usable for certification. */
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gpg_error_t cert_use_cert_p (ksba_cert_t cert);
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gpg_error_t check_cert_use_cert (ksba_cert_t cert);
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/* Return 0 if the certificate CERT is usable for signing OCSP
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responses. */
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gpg_error_t cert_use_ocsp_p (ksba_cert_t cert);
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gpg_error_t check_cert_use_ocsp (ksba_cert_t cert);
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/* Return 0 if the certificate CERT is usable for signing CRLs. */
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gpg_error_t cert_use_crl_p (ksba_cert_t cert);
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gpg_error_t check_cert_use_crl (ksba_cert_t cert);
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#endif /*VALIDATE_H*/
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