root_unix.go

Documentation: crypto/x509

     1  // Copyright 2011 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  // +build dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
     6  
     7  package x509
     8  
     9  import (
    10  	"io/ioutil"
    11  	"os"
    12  )
    13  
    14  // Possible directories with certificate files; stop after successfully
    15  // reading at least one file from a directory.
    16  var certDirectories = []string{
    17  	"/etc/ssl/certs",               // SLES10/SLES11, https://golang.org/issue/12139
    18  	"/system/etc/security/cacerts", // Android
    19  	"/usr/local/share/certs",       // FreeBSD
    20  	"/etc/pki/tls/certs",           // Fedora/RHEL
    21  	"/etc/openssl/certs",           // NetBSD
    22  }
    23  
    24  const (
    25  	// certFileEnv is the environment variable which identifies where to locate
    26  	// the SSL certificate file. If set this overrides the system default.
    27  	certFileEnv = "SSL_CERT_FILE"
    28  
    29  	// certDirEnv is the environment variable which identifies which directory
    30  	// to check for SSL certificate files. If set this overrides the system default.
    31  	certDirEnv = "SSL_CERT_DIR"
    32  )
    33  
    34  func (c *Certificate) systemVerify(opts *VerifyOptions) (chains [][]*Certificate, err error) {
    35  	return nil, nil
    36  }
    37  
    38  func loadSystemRoots() (*CertPool, error) {
    39  	roots := NewCertPool()
    40  
    41  	files := certFiles
    42  	if f := os.Getenv(certFileEnv); f != "" {
    43  		files = []string{f}
    44  	}
    45  
    46  	var firstErr error
    47  	for _, file := range files {
    48  		data, err := ioutil.ReadFile(file)
    49  		if err == nil {
    50  			roots.AppendCertsFromPEM(data)
    51  			break
    52  		}
    53  		if firstErr == nil && !os.IsNotExist(err) {
    54  			firstErr = err
    55  		}
    56  	}
    57  
    58  	dirs := certDirectories
    59  	if d := os.Getenv(certDirEnv); d != "" {
    60  		dirs = []string{d}
    61  	}
    62  
    63  	for _, directory := range dirs {
    64  		fis, err := ioutil.ReadDir(directory)
    65  		if err != nil {
    66  			if firstErr == nil && !os.IsNotExist(err) {
    67  				firstErr = err
    68  			}
    69  			continue
    70  		}
    71  		rootsAdded := false
    72  		for _, fi := range fis {
    73  			data, err := ioutil.ReadFile(directory + "/" + fi.Name())
    74  			if err == nil && roots.AppendCertsFromPEM(data) {
    75  				rootsAdded = true
    76  			}
    77  		}
    78  		if rootsAdded {
    79  			return roots, nil
    80  		}
    81  	}
    82  
    83  	if len(roots.certs) > 0 || firstErr == nil {
    84  		return roots, nil
    85  	}
    86  
    87  	return nil, firstErr
    88  }
    89
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