139 lines
3.8 KiB
Go
139 lines
3.8 KiB
Go
package httputil
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import (
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"crypto/x509"
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"fmt"
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"io/ioutil"
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"path/filepath"
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"github.com/github/git-lfs/config"
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"github.com/rubyist/tracerx"
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)
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// isCertVerificationDisabledForHost returns whether SSL certificate verification
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// has been disabled for the given host, or globally
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func isCertVerificationDisabledForHost(cfg *config.Configuration, host string) bool {
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hostSslVerify, _ := cfg.GitConfig(fmt.Sprintf("http.https://%v/.sslverify", host))
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if hostSslVerify == "false" {
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return true
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}
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globalSslVerify, _ := cfg.GitConfig("http.sslverify")
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if globalSslVerify == "false" || cfg.GetenvBool("GIT_SSL_NO_VERIFY", false) {
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return true
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}
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return false
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}
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// getRootCAsForHost returns a certificate pool for that specific host (which may
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// be "host:port" loaded from either the gitconfig or from a platform-specific
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// source which is not included by default in the golang certificate search)
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// May return nil if it doesn't have anything to add, in which case the default
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// RootCAs will be used if passed to TLSClientConfig.RootCAs
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func getRootCAsForHost(cfg *config.Configuration, host string) *x509.CertPool {
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// don't init pool, want to return nil not empty if none found; init only on successful add cert
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var pool *x509.CertPool
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// gitconfig first
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pool = appendRootCAsForHostFromGitconfig(cfg, pool, host)
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// Platform specific
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return appendRootCAsForHostFromPlatform(pool, host)
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}
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func appendRootCAsForHostFromGitconfig(cfg *config.Configuration, pool *x509.CertPool, host string) *x509.CertPool {
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// Accumulate certs from all these locations:
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// GIT_SSL_CAINFO first
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if cafile := cfg.Getenv("GIT_SSL_CAINFO"); len(cafile) > 0 {
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return appendCertsFromFile(pool, cafile)
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}
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// http.<url>.sslcainfo
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// we know we have simply "host" or "host:port"
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key := fmt.Sprintf("http.https://%v/.sslcainfo", host)
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if cafile, ok := cfg.GitConfig(key); ok {
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return appendCertsFromFile(pool, cafile)
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}
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// http.sslcainfo
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if cafile, ok := cfg.GitConfig("http.sslcainfo"); ok {
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return appendCertsFromFile(pool, cafile)
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}
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// GIT_SSL_CAPATH
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if cadir := cfg.Getenv("GIT_SSL_CAPATH"); len(cadir) > 0 {
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return appendCertsFromFilesInDir(pool, cadir)
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}
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// http.sslcapath
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if cadir, ok := cfg.GitConfig("http.sslcapath"); ok {
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return appendCertsFromFilesInDir(pool, cadir)
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}
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return pool
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}
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func appendCertsFromFilesInDir(pool *x509.CertPool, dir string) *x509.CertPool {
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files, err := ioutil.ReadDir(dir)
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if err != nil {
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tracerx.Printf("Error reading cert dir %q: %v", dir, err)
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return pool
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}
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for _, f := range files {
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pool = appendCertsFromFile(pool, filepath.Join(dir, f.Name()))
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}
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return pool
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}
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func appendCertsFromFile(pool *x509.CertPool, filename string) *x509.CertPool {
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data, err := ioutil.ReadFile(filename)
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if err != nil {
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tracerx.Printf("Error reading cert file %q: %v", filename, err)
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return pool
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}
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// Firstly, try parsing as binary certificate
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if certs, err := x509.ParseCertificates(data); err == nil {
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return appendCerts(pool, certs)
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}
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// If not binary certs, try PEM data
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return appendCertsFromPEMData(pool, data)
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}
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func appendCerts(pool *x509.CertPool, certs []*x509.Certificate) *x509.CertPool {
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if len(certs) == 0 {
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// important to return unmodified (may be nil)
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return pool
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}
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if pool == nil {
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pool = x509.NewCertPool()
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}
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for _, cert := range certs {
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pool.AddCert(cert)
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}
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return pool
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}
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func appendCertsFromPEMData(pool *x509.CertPool, data []byte) *x509.CertPool {
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if len(data) == 0 {
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return pool
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}
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// Bit of a dance, need to ensure if AppendCertsFromPEM fails we still return
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// nil and not an empty pool, so system roots still get used
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var ret *x509.CertPool
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if pool == nil {
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ret = x509.NewCertPool()
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} else {
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ret = pool
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}
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if !ret.AppendCertsFromPEM(data) {
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// Return unmodified input pool (may be nil, do not replace with empty)
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return pool
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}
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return ret
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}
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