54 lines
1.5 KiB
Go
54 lines
1.5 KiB
Go
package basic
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import (
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"crypto/sha1"
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"encoding/base64"
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"encoding/csv"
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"errors"
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"os"
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)
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// ErrSHARequired - returned in error field of challenge when the htpasswd was not made using SHA1 algorithm.
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// (SHA1 is considered obsolete but the alternative for htpasswd is MD5, or system crypt...)
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var ErrSHARequired = errors.New("htpasswd file must use SHA (htpasswd -s)")
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// HTPasswd - holds a path to a system .htpasswd file and the machinery to parse it.
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type HTPasswd struct {
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path string
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reader *csv.Reader
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}
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// NewHTPasswd - Create a new HTPasswd with the given path to .htpasswd file.
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func NewHTPasswd(htpath string) *HTPasswd {
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return &HTPasswd{path: htpath}
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}
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// AuthenticateUser - Check a given user:password credential against the receiving HTPasswd's file.
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func (htpasswd *HTPasswd) AuthenticateUser(user string, pwd string) (bool, error) {
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// Hash the credential.
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sha := sha1.New()
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sha.Write([]byte(pwd))
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hash := base64.StdEncoding.EncodeToString(sha.Sum(nil))
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// Open the file.
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in, err := os.Open(htpasswd.path)
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if err != nil {
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return false, err
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}
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// Parse the contents of the standard .htpasswd until we hit the end or find a match.
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reader := csv.NewReader(in)
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reader.Comma = ':'
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reader.Comment = '#'
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reader.TrimLeadingSpace = true
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for entry, readerr := reader.Read(); entry != nil || readerr != nil; entry, readerr = reader.Read() {
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if entry[0] == user {
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if len(entry[1]) < 6 || entry[1][0:5] != "{SHA}" {
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return false, ErrSHARequired
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}
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return entry[1][5:] == hash, nil
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}
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}
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return false, nil
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}
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