/usr/share/gocode/src/github.com/msteinert/pam/transaction.go is in golang-github-msteinert-pam-dev 0.0~git20170830.0.f4cd9f5-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 | // Package pam provides a wrapper for the PAM application API.
package pam
//#include <security/pam_appl.h>
//#include <stdlib.h>
//#cgo CFLAGS: -Wall -std=c99
//#cgo LDFLAGS: -lpam
//void init_pam_conv(struct pam_conv *conv, long c);
import "C"
import (
"runtime"
"strings"
"unsafe"
)
// Style is the type of message that the conversation handler should display.
type Style int
// Coversation handler style types.
const (
// PromptEchoOff indicates the conversation handler should obtain a
// string without echoing any text.
PromptEchoOff Style = C.PAM_PROMPT_ECHO_OFF
// PromptEchoOn indicates the conversation handler should obtain a
// string while echoing text.
PromptEchoOn = C.PAM_PROMPT_ECHO_ON
// ErrorMsg indicates the conversation handler should display an
// error message.
ErrorMsg = C.PAM_ERROR_MSG
// TextInfo indicates the conversation handler should display some
// text.
TextInfo = C.PAM_TEXT_INFO
)
// ConversationHandler is an interface for objects that can be used as
// conversation callbacks during PAM authentication.
type ConversationHandler interface {
// RespondPAM receives a message style and a message string. If the
// message Style is PromptEchoOff or PromptEchoOn then the function
// should return a response string.
RespondPAM(Style, string) (string, error)
}
// ConversationFunc is an adapter to allow the use of ordinary functions as
// conversation callbacks.
type ConversationFunc func(Style, string) (string, error)
// RespondPAM is a conversation callback adapter.
func (f ConversationFunc) RespondPAM(s Style, msg string) (string, error) {
return f(s, msg)
}
// cbPAMConv is a wrapper for the conversation callback function.
//export cbPAMConv
func cbPAMConv(s C.int, msg *C.char, c int) (*C.char, C.int) {
var r string
var err error
v := cbGet(c)
switch cb := v.(type) {
case ConversationHandler:
r, err = cb.RespondPAM(Style(s), C.GoString(msg))
}
if err != nil {
return nil, C.PAM_CONV_ERR
}
return C.CString(r), C.PAM_SUCCESS
}
// Transaction is the application's handle for a PAM transaction.
type Transaction struct {
handle *C.pam_handle_t
conv *C.struct_pam_conv
status C.int
c int
}
// transactionFinalizer cleans up the PAM handle and deletes the callback
// function.
func transactionFinalizer(t *Transaction) {
C.pam_end(t.handle, t.status)
cbDelete(t.c)
}
// Start initiates a new PAM transaction. Service is treated identically to
// how pam_start treats it internally.
//
// All application calls to PAM begin with Start (or StartFunc). The returned
// transaction provides an interface to the remainder of the API.
func Start(service, user string, handler ConversationHandler) (*Transaction, error) {
t := &Transaction{
conv: &C.struct_pam_conv{},
c: cbAdd(handler),
}
C.init_pam_conv(t.conv, C.long(t.c))
runtime.SetFinalizer(t, transactionFinalizer)
s := C.CString(service)
defer C.free(unsafe.Pointer(s))
var u *C.char
if len(user) != 0 {
u = C.CString(user)
defer C.free(unsafe.Pointer(u))
}
t.status = C.pam_start(s, u, t.conv, &t.handle)
if t.status != C.PAM_SUCCESS {
return nil, t
}
return t, nil
}
// StartFunc registers the handler func as a conversation handler.
func StartFunc(service, user string, handler func(Style, string) (string, error)) (*Transaction, error) {
return Start(service, user, ConversationFunc(handler))
}
func (t *Transaction) Error() string {
return C.GoString(C.pam_strerror(t.handle, C.int(t.status)))
}
// Item is a an PAM information type.
type Item int
// PAM Item types.
const (
// Service is the name which identifies the PAM stack.
Service Item = C.PAM_SERVICE
// User identifies the username identity used by a service.
User = C.PAM_USER
// Tty is the terminal name.
Tty = C.PAM_TTY
// Rhost is the requesting host name.
Rhost = C.PAM_RHOST
// Authtok is the currently active authentication token.
Authtok = C.PAM_AUTHTOK
// Oldauthtok is the old authentication token.
Oldauthtok = C.PAM_OLDAUTHTOK
// Ruser is the requesting user name.
Ruser = C.PAM_RUSER
// UserPrompt is the string use to prompt for a username.
UserPrompt = C.PAM_USER_PROMPT
)
// SetItem sets a PAM information item.
func (t *Transaction) SetItem(i Item, item string) error {
cs := unsafe.Pointer(C.CString(item))
defer C.free(cs)
t.status = C.pam_set_item(t.handle, C.int(i), cs)
if t.status != C.PAM_SUCCESS {
return t
}
return nil
}
// GetItem retrieves a PAM information item.
func (t *Transaction) GetItem(i Item) (string, error) {
var s unsafe.Pointer
t.status = C.pam_get_item(t.handle, C.int(i), &s)
if t.status != C.PAM_SUCCESS {
return "", t
}
return C.GoString((*C.char)(s)), nil
}
// Flags are inputs to various PAM functions than be combined with a bitwise
// or. Refer to the official PAM documentation for which flags are accepted
// by which functions.
type Flags int
// PAM Flag types.
const (
// Silent indicates that no messages should be emitted.
Silent Flags = C.PAM_SILENT
// DisallowNullAuthtok indicates that authorization should fail
// if the user does not have a registered authentication token.
DisallowNullAuthtok = C.PAM_DISALLOW_NULL_AUTHTOK
// EstablishCred indicates that credentials should be established
// for the user.
EstablishCred = C.PAM_ESTABLISH_CRED
// DeleteCred inidicates that credentials should be deleted.
DeleteCred = C.PAM_DELETE_CRED
// ReinitializeCred indicates that credentials should be fully
// reinitialized.
ReinitializeCred = C.PAM_REINITIALIZE_CRED
// RefreshCred indicates that the lifetime of existing credentials
// should be extended.
RefreshCred = C.PAM_REFRESH_CRED
// ChangeExpiredAuthtok indicates that the authentication token
// should be changed if it has expired.
ChangeExpiredAuthtok = C.PAM_CHANGE_EXPIRED_AUTHTOK
)
// Authenticate is used to authenticate the user.
//
// Valid flags: Silent, DisallowNullAuthtok
func (t *Transaction) Authenticate(f Flags) error {
t.status = C.pam_authenticate(t.handle, C.int(f))
if t.status != C.PAM_SUCCESS {
return t
}
return nil
}
// SetCred is used to establish, maintain and delete the credentials of a
// user.
//
// Valid flags: EstablishCred, DeleteCred, ReinitializeCred, RefreshCred
func (t *Transaction) SetCred(f Flags) error {
t.status = C.pam_setcred(t.handle, C.int(f))
if t.status != C.PAM_SUCCESS {
return t
}
return nil
}
// AcctMgmt is used to determine if the user's account is valid.
//
// Valid flags: Silent, DisallowNullAuthtok
func (t *Transaction) AcctMgmt(f Flags) error {
t.status = C.pam_acct_mgmt(t.handle, C.int(f))
if t.status != C.PAM_SUCCESS {
return t
}
return nil
}
// ChangeAuthTok is used to change the authentication token.
//
// Valid flags: Silent, ChangeExpiredAuthtok
func (t *Transaction) ChangeAuthTok(f Flags) error {
t.status = C.pam_chauthtok(t.handle, C.int(f))
if t.status != C.PAM_SUCCESS {
return t
}
return nil
}
// OpenSession sets up a user session for an authenticated user.
//
// Valid flags: Slient
func (t *Transaction) OpenSession(f Flags) error {
t.status = C.pam_open_session(t.handle, C.int(f))
if t.status != C.PAM_SUCCESS {
return t
}
return nil
}
// CloseSession closes a previously opened session.
//
// Valid flags: Silent
func (t *Transaction) CloseSession(f Flags) error {
t.status = C.pam_close_session(t.handle, C.int(f))
if t.status != C.PAM_SUCCESS {
return t
}
return nil
}
// PutEnv adds or changes the value of PAM environment variables.
//
// NAME=value will set a variable to a value.
// NAME= will set a variable to an empty value.
// NAME (without an "=") will delete a variable.
func (t *Transaction) PutEnv(nameval string) error {
cs := C.CString(nameval)
defer C.free(unsafe.Pointer(cs))
t.status = C.pam_putenv(t.handle, cs)
if t.status != C.PAM_SUCCESS {
return t
}
return nil
}
// GetEnv is used to retrieve a PAM environment variable.
func (t *Transaction) GetEnv(name string) string {
cs := C.CString(name)
defer C.free(unsafe.Pointer(cs))
value := C.pam_getenv(t.handle, cs)
if value == nil {
return ""
}
return C.GoString(value)
}
func next(p **C.char) **C.char {
return (**C.char)(unsafe.Pointer(uintptr(unsafe.Pointer(p)) + unsafe.Sizeof(p)))
}
// GetEnvList returns a copy of the PAM environment as a map.
func (t *Transaction) GetEnvList() (map[string]string, error) {
env := make(map[string]string)
p := C.pam_getenvlist(t.handle)
if p == nil {
t.status = C.PAM_BUF_ERR
return nil, t
}
for q := p; *q != nil; q = next(q) {
chunks := strings.SplitN(C.GoString(*q), "=", 2)
if len(chunks) == 2 {
env[chunks[0]] = chunks[1]
}
C.free(unsafe.Pointer(*q))
}
C.free(unsafe.Pointer(p))
return env, nil
}
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