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comparison pam/src/conv.rs @ 15:27730595f1ea

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Adding pam-http module
author Anthony Nowell <anthony@algorithmia.com>
date Sun, 24 Sep 2017 00:22:29 -0600
parents
children 0ceeffe67ec4
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14:51b097c12d3c 15:27730595f1ea
1 use libc::{c_char, c_int};
2 use std::ptr;
3 use std::ffi::{CStr, CString};
4
5 use constants::PamResultCode;
6 use constants::*;
7 use module::{PamItem, PamResult};
8
9 #[allow(missing_copy_implementations)]
10 pub enum AppDataPtr {}
11
12 #[repr(C)]
13 struct PamMessage {
14 msg_style: PamMessageStyle,
15 msg: *const c_char,
16 }
17
18 #[repr(C)]
19 struct PamResponse {
20 resp: *const c_char,
21 resp_retcode: AlwaysZero,
22 }
23
24 /// `PamConv` acts as a channel for communicating with user.
25 ///
26 /// Communication is mediated by the pam client (the application that invoked
27 /// pam). Messages sent will be relayed to the user by the client, and response
28 /// will be relayed back.
29 #[repr(C)]
30 pub struct PamConv {
31 conv: extern "C" fn(num_msg: c_int,
32 pam_message: &&PamMessage,
33 pam_response: &mut *const PamResponse,
34 appdata_ptr: *const AppDataPtr)
35 -> PamResultCode,
36 appdata_ptr: *const AppDataPtr,
37 }
38
39 impl PamConv {
40 /// Sends a message to the pam client.
41 ///
42 /// This will typically result in the user seeing a message or a prompt.
43 /// There are several message styles available:
44 ///
45 /// - PAM_PROMPT_ECHO_OFF
46 /// - PAM_PROMPT_ECHO_ON
47 /// - PAM_ERROR_MSG
48 /// - PAM_TEXT_INFO
49 /// - PAM_RADIO_TYPE
50 /// - PAM_BINARY_PROMPT
51 ///
52 /// Note that the user experience will depend on how the client implements
53 /// these message styles - and not all applications implement all message
54 /// styles.
55 pub fn send(&self, style: PamMessageStyle, msg: &str) -> PamResult<Option<String>> {
56 let mut resp_ptr: *const PamResponse = ptr::null();
57 let msg = PamMessage {
58 msg_style: style,
59 msg: CString::new(msg).unwrap().as_ptr(),
60 };
61
62 let ret = (self.conv)(1, &&msg, &mut resp_ptr, self.appdata_ptr);
63
64 if PamResultCode::PAM_SUCCESS == ret {
65 if resp_ptr.is_null() {
66 Ok(None)
67 } else {
68 let bytes = unsafe { CStr::from_ptr((*resp_ptr).resp).to_bytes() };
69 Ok(String::from_utf8(bytes.to_vec()).ok())
70 }
71 } else {
72 Err(ret)
73 }
74 }
75 }
76
77 impl PamItem for PamConv {
78 fn item_type() -> PamItemType {
79 PAM_CONV
80 }
81 }