whyno-cli 0.3.0

Linux permission debugger
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

//! Path walk rendering for explain mode.
//!
//! Split from `explain.rs` for module size.
//! Writes per-component stat, ACL, flags, mount details.

use std::io::Write;

use whyno_core::state::path::PathComponent;
use whyno_core::state::SystemState;

use crate::error::OutputError;

/// Path walk section, one indexed component per line.
pub fn write_path_walk(state: &SystemState, writer: &mut dyn Write) -> Result<(), OutputError> {
    writeln!(writer, "=== Path Walk ===")?;
    for (i, comp) in state.walk.iter().enumerate() {
        write_component(i, comp, state, writer)?;
    }
    Ok(())
}

/// Stat, acl, flags, and mount detail for one indexed component.
fn write_component(
    index: usize,
    comp: &PathComponent,
    state: &SystemState,
    writer: &mut dyn Write,
) -> Result<(), OutputError> {
    writeln!(writer, "  [{index}] {}", comp.path.display())?;
    write_stat_info(comp, writer)?;
    write_acl_info(comp, writer)?;
    write_flags_info(comp, writer)?;
    write_mount_info(comp, state, writer)?;
    Ok(())
}

/// Stat line: mode (octal), uid, gid, file type, or probe status.
fn write_stat_info(comp: &PathComponent, writer: &mut dyn Write) -> Result<(), OutputError> {
    match &comp.stat {
        whyno_core::state::Probe::Known(stat) => {
            writeln!(
                writer,
                "      stat: mode={:#06o} uid={} gid={} type={:?}",
                stat.mode, stat.uid, stat.gid, stat.file_type
            )?;
        }
        whyno_core::state::Probe::Unknown => {
            writeln!(writer, "      stat: (unknown)")?;
        }
        whyno_core::state::Probe::Inaccessible => {
            writeln!(writer, "      stat: (inaccessible)")?;
        }
        _ => {
            writeln!(writer, "      stat: (unknown variant)")?;
        }
    }
    Ok(())
}

/// Acl section: entry count and per-entry detail, or probe status.
fn write_acl_info(comp: &PathComponent, writer: &mut dyn Write) -> Result<(), OutputError> {
    match &comp.acl {
        whyno_core::state::Probe::Known(acl) if !acl.0.is_empty() => {
            writeln!(writer, "      acl: {} entries", acl.0.len())?;
            for entry in &acl.0 {
                write_acl_entry(entry, writer)?;
            }
        }
        whyno_core::state::Probe::Known(_) => {
            writeln!(writer, "      acl: (none)")?;
        }
        whyno_core::state::Probe::Unknown => {
            writeln!(writer, "      acl: (unknown)")?;
        }
        whyno_core::state::Probe::Inaccessible => {
            writeln!(writer, "      acl: (inaccessible)")?;
        }
        _ => {
            writeln!(writer, "      acl: (unknown variant)")?;
        }
    }
    Ok(())
}

/// Single acl entry: tag, qualifier, and rwx perms.
fn write_acl_entry(
    entry: &whyno_core::state::acl::AclEntry,
    writer: &mut dyn Write,
) -> Result<(), OutputError> {
    writeln!(
        writer,
        "        {:?} q={:?} perms={:?}",
        entry.tag, entry.qualifier, entry.perms
    )?;
    Ok(())
}

/// Flags section: immutable and append_only probe results.
fn write_flags_info(comp: &PathComponent, writer: &mut dyn Write) -> Result<(), OutputError> {
    match &comp.flags {
        whyno_core::state::Probe::Known(flags) => {
            writeln!(
                writer,
                "      flags: immutable={} append_only={}",
                flags.immutable, flags.append_only
            )?;
        }
        whyno_core::state::Probe::Unknown => {
            writeln!(writer, "      flags: (unknown)")?;
        }
        whyno_core::state::Probe::Inaccessible => {
            writeln!(writer, "      flags: (inaccessible)")?;
        }
        _ => {
            writeln!(writer, "      flags: (unknown variant)")?;
        }
    }
    Ok(())
}

/// Mount section: mountpoint, fs_type, ro/noexec/nosuid options.
fn write_mount_info(
    comp: &PathComponent,
    state: &SystemState,
    writer: &mut dyn Write,
) -> Result<(), OutputError> {
    match comp.mount.and_then(|i| state.mounts.0.get(i)) {
        Some(entry) => {
            writeln!(
                writer,
                "      mount: {} ({}) ro={} noexec={} nosuid={}",
                entry.mountpoint.display(),
                entry.fs_type,
                entry.options.read_only,
                entry.options.noexec,
                entry.options.nosuid,
            )?;
        }
        None => {
            writeln!(writer, "      mount: (not resolved)")?;
        }
    }
    Ok(())
}

#[cfg(test)]
#[path = "explain_walk_tests.rs"]
mod tests;