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moby--moby/registry/authchallenge.go
Josh Hawn 41e20cecb9 Adds support for v2 registry login
summary of changes:

registry/auth.go
  - More logging around the login functions
  - split Login() out to handle different code paths for v1 (unchanged logic)
    and v2 (does not currently do account creation)
  - handling for either basic or token based login attempts
registry/authchallenge.go
  - New File
  - credit to Brian Bland <brian.bland@docker.com> (github: BrianBland)
  - handles parsing of WWW-Authenticate response headers
registry/endpoint.go
  - EVEN MOAR LOGGING
  - Many edits throught to make the coad less dense. Sparse code is more
    readable code.
  - slit Ping() out to handle different code paths for v1 (unchanged logic)
    and v2.
  - Updated Endpoint struct type to include an entry for authorization
    challenges discovered during ping of a v2 registry.
  - If registry endpoint version is unknown, v2 code path is first attempted,
    then fallback to v1 upon failure.
registry/service.go
  - STILL MOAR LOGGING
  - simplified the logic around starting the 'auth' job.
registry/session.go
  - updated use of a registry.Endpoint struct field.
registry/token.go
  - New File
  - Handles getting token from the parameters of a token auth challenge.
  - Modified from function written by Brian Bland (see above credit).
registry/types.go
  - Removed 'DefaultAPIVersion' in lieu of 'APIVersionUnknown = 0'`

Docker-DCO-1.1-Signed-off-by: Josh Hawn <josh.hawn@docker.com> (github: jlhawn)
2015-01-15 14:04:14 -08:00

150 lines
3.3 KiB
Go

package registry
import (
"net/http"
"strings"
)
// Octet types from RFC 2616.
type octetType byte
// AuthorizationChallenge carries information
// from a WWW-Authenticate response header.
type AuthorizationChallenge struct {
Scheme string
Parameters map[string]string
}
var octetTypes [256]octetType
const (
isToken octetType = 1 << iota
isSpace
)
func init() {
// OCTET = <any 8-bit sequence of data>
// CHAR = <any US-ASCII character (octets 0 - 127)>
// CTL = <any US-ASCII control character (octets 0 - 31) and DEL (127)>
// CR = <US-ASCII CR, carriage return (13)>
// LF = <US-ASCII LF, linefeed (10)>
// SP = <US-ASCII SP, space (32)>
// HT = <US-ASCII HT, horizontal-tab (9)>
// <"> = <US-ASCII double-quote mark (34)>
// CRLF = CR LF
// LWS = [CRLF] 1*( SP | HT )
// TEXT = <any OCTET except CTLs, but including LWS>
// separators = "(" | ")" | "<" | ">" | "@" | "," | ";" | ":" | "\" | <">
// | "/" | "[" | "]" | "?" | "=" | "{" | "}" | SP | HT
// token = 1*<any CHAR except CTLs or separators>
// qdtext = <any TEXT except <">>
for c := 0; c < 256; c++ {
var t octetType
isCtl := c <= 31 || c == 127
isChar := 0 <= c && c <= 127
isSeparator := strings.IndexRune(" \t\"(),/:;<=>?@[]\\{}", rune(c)) >= 0
if strings.IndexRune(" \t\r\n", rune(c)) >= 0 {
t |= isSpace
}
if isChar && !isCtl && !isSeparator {
t |= isToken
}
octetTypes[c] = t
}
}
func parseAuthHeader(header http.Header) []*AuthorizationChallenge {
var challenges []*AuthorizationChallenge
for _, h := range header[http.CanonicalHeaderKey("WWW-Authenticate")] {
v, p := parseValueAndParams(h)
if v != "" {
challenges = append(challenges, &AuthorizationChallenge{Scheme: v, Parameters: p})
}
}
return challenges
}
func parseValueAndParams(header string) (value string, params map[string]string) {
params = make(map[string]string)
value, s := expectToken(header)
if value == "" {
return
}
value = strings.ToLower(value)
s = "," + skipSpace(s)
for strings.HasPrefix(s, ",") {
var pkey string
pkey, s = expectToken(skipSpace(s[1:]))
if pkey == "" {
return
}
if !strings.HasPrefix(s, "=") {
return
}
var pvalue string
pvalue, s = expectTokenOrQuoted(s[1:])
if pvalue == "" {
return
}
pkey = strings.ToLower(pkey)
params[pkey] = pvalue
s = skipSpace(s)
}
return
}
func skipSpace(s string) (rest string) {
i := 0
for ; i < len(s); i++ {
if octetTypes[s[i]]&isSpace == 0 {
break
}
}
return s[i:]
}
func expectToken(s string) (token, rest string) {
i := 0
for ; i < len(s); i++ {
if octetTypes[s[i]]&isToken == 0 {
break
}
}
return s[:i], s[i:]
}
func expectTokenOrQuoted(s string) (value string, rest string) {
if !strings.HasPrefix(s, "\"") {
return expectToken(s)
}
s = s[1:]
for i := 0; i < len(s); i++ {
switch s[i] {
case '"':
return s[:i], s[i+1:]
case '\\':
p := make([]byte, len(s)-1)
j := copy(p, s[:i])
escape := true
for i = i + i; i < len(s); i++ {
b := s[i]
switch {
case escape:
escape = false
p[j] = b
j++
case b == '\\':
escape = true
case b == '"':
return string(p[:j]), s[i+1:]
default:
p[j] = b
j++
}
}
return "", ""
}
}
return "", ""
}