root_darwin.go

     1  // Copyright 2020 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package x509
     6  
     7  import (
     8  	macOS "crypto/x509/internal/macos"
     9  	"errors"
    10  	"fmt"
    11  )
    12  
    13  func (c *Certificate) systemVerify(opts *VerifyOptions) (chains [][]*Certificate, err error) {
    14  	certs := macOS.CFArrayCreateMutable()
    15  	defer macOS.ReleaseCFArray(certs)
    16  	leaf, err := macOS.SecCertificateCreateWithData(c.Raw)
    17  	if err != nil {
    18  		return nil, errors.New("invalid leaf certificate")
    19  	}
    20  	macOS.CFArrayAppendValue(certs, leaf)
    21  	if opts.Intermediates != nil {
    22  		for _, lc := range opts.Intermediates.lazyCerts {
    23  			c, err := lc.getCert()
    24  			if err != nil {
    25  				return nil, err
    26  			}
    27  			sc, err := macOS.SecCertificateCreateWithData(c.Raw)
    28  			if err != nil {
    29  				return nil, err
    30  			}
    31  			macOS.CFArrayAppendValue(certs, sc)
    32  		}
    33  	}
    34  
    35  	policies := macOS.CFArrayCreateMutable()
    36  	defer macOS.ReleaseCFArray(policies)
    37  	sslPolicy, err := macOS.SecPolicyCreateSSL(opts.DNSName)
    38  	if err != nil {
    39  		return nil, err
    40  	}
    41  	macOS.CFArrayAppendValue(policies, sslPolicy)
    42  
    43  	trustObj, err := macOS.SecTrustCreateWithCertificates(certs, policies)
    44  	if err != nil {
    45  		return nil, err
    46  	}
    47  	defer macOS.CFRelease(trustObj)
    48  
    49  	if !opts.CurrentTime.IsZero() {
    50  		dateRef := macOS.TimeToCFDateRef(opts.CurrentTime)
    51  		defer macOS.CFRelease(dateRef)
    52  		if err := macOS.SecTrustSetVerifyDate(trustObj, dateRef); err != nil {
    53  			return nil, err
    54  		}
    55  	}
    56  
    57  	// TODO(roland): we may want to allow passing in SCTs via VerifyOptions and
    58  	// set them via SecTrustSetSignedCertificateTimestamps, since Apple will
    59  	// always enforce its SCT requirements, and there are still _some_ people
    60  	// using TLS or OCSP for that.
    61  
    62  	if ret, err := macOS.SecTrustEvaluateWithError(trustObj); err != nil {
    63  		switch ret {
    64  		case macOS.ErrSecCertificateExpired:
    65  			return nil, CertificateInvalidError{c, Expired, err.Error()}
    66  		case macOS.ErrSecHostNameMismatch:
    67  			return nil, HostnameError{c, opts.DNSName}
    68  		case macOS.ErrSecNotTrusted:
    69  			return nil, UnknownAuthorityError{Cert: c}
    70  		default:
    71  			return nil, fmt.Errorf("x509: %s", err)
    72  		}
    73  	}
    74  
    75  	chain := [][]*Certificate{{}}
    76  	numCerts := macOS.SecTrustGetCertificateCount(trustObj)
    77  	for i := 0; i < numCerts; i++ {
    78  		certRef, err := macOS.SecTrustGetCertificateAtIndex(trustObj, i)
    79  		if err != nil {
    80  			return nil, err
    81  		}
    82  		cert, err := exportCertificate(certRef)
    83  		if err != nil {
    84  			return nil, err
    85  		}
    86  		chain[0] = append(chain[0], cert)
    87  	}
    88  	if len(chain[0]) == 0 {
    89  		// This should _never_ happen, but to be safe
    90  		return nil, errors.New("x509: macOS certificate verification internal error")
    91  	}
    92  
    93  	if opts.DNSName != "" {
    94  		// If we have a DNS name, apply our own name verification
    95  		if err := chain[0][0].VerifyHostname(opts.DNSName); err != nil {
    96  			return nil, err
    97  		}
    98  	}
    99  
   100  	keyUsages := opts.KeyUsages
   101  	if len(keyUsages) == 0 {
   102  		keyUsages = []ExtKeyUsage{ExtKeyUsageServerAuth}
   103  	}
   104  
   105  	// If any key usage is acceptable then we're done.
   106  	for _, usage := range keyUsages {
   107  		if usage == ExtKeyUsageAny {
   108  			return chain, nil
   109  		}
   110  	}
   111  
   112  	if !checkChainForKeyUsage(chain[0], keyUsages) {
   113  		return nil, CertificateInvalidError{c, IncompatibleUsage, ""}
   114  	}
   115  
   116  	return chain, nil
   117  }
   118  
   119  // exportCertificate returns a *Certificate for a SecCertificateRef.
   120  func exportCertificate(cert macOS.CFRef) (*Certificate, error) {
   121  	data, err := macOS.SecCertificateCopyData(cert)
   122  	if err != nil {
   123  		return nil, err
   124  	}
   125  	return ParseCertificate(data)
   126  }
   127  
   128  func loadSystemRoots() (*CertPool, error) {
   129  	return &CertPool{systemPool: true}, nil
   130  }
   131
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