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comparison src/libpam/pam_ffi.rs @ 101:94b51fa4f797

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Fix memory soundness issues: - Ensure Questions are pinned in memory when sending them through PAM. - Hold on to the PAM conversation struct after we build it. (Linux-PAM is leninent about this and copies the pam_conv structure.)
author Paul Fisher <paul@pfish.zone>
date Tue, 24 Jun 2025 17:54:33 -0400
parents b87100c5eed4
children 94eb11cb1798
comparison
equal deleted inserted replaced
100:3f11b8d30f63 101:94b51fa4f797
55 /// 55 ///
56 /// For most requests, this will be an owned [`CStr`], 56 /// For most requests, this will be an owned [`CStr`],
57 /// but for requests with style `PAM_BINARY_PROMPT`, 57 /// but for requests with style `PAM_BINARY_PROMPT`,
58 /// this will be `CBinaryData` (a Linux-PAM extension). 58 /// this will be `CBinaryData` (a Linux-PAM extension).
59 pub data: Option<CHeapBox<c_void>>, 59 pub data: Option<CHeapBox<c_void>>,
60 pub _marker: Immovable,
61 } 60 }
62 61
63 /// The callback that PAM uses to get information in a conversation. 62 /// The callback that PAM uses to get information in a conversation.
64 /// 63 ///
65 /// - `num_msg` is the number of messages in the `questions` array. 64 /// - `num_msg` is the number of messages in the `questions` array.
84 /// The function that is called to get information from the user. 83 /// The function that is called to get information from the user.
85 pub callback: ConversationCallback, 84 pub callback: ConversationCallback,
86 /// The pointer that will be passed as the last parameter 85 /// The pointer that will be passed as the last parameter
87 /// to the conversation callback. 86 /// to the conversation callback.
88 pub appdata: *const AppData, 87 pub appdata: *const AppData,
88 /// Marker to associate the lifetime of this with the conversation
89 /// that was passed in.
89 pub life: PhantomData<&'a mut ()>, 90 pub life: PhantomData<&'a mut ()>,
90 pub _marker: Immovable,
91 } 91 }
92 92
93 /// Gets a string version of an error message. 93 /// Gets a string version of an error message.
94 pub fn strerror(code: c_uint) -> Option<&'static str> { 94 pub fn strerror(code: c_uint) -> Option<&'static str> {
95 // SAFETY: Every single PAM implementation I can find (Linux-PAM, OpenPAM, 95 // SAFETY: Every single PAM implementation I can find (Linux-PAM, OpenPAM,