enseal 0.15.1

Secure, ephemeral secret sharing for developers
Documentation 
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

use anyhow::{bail, Result};
use clap::Args;

use crate::crypto::at_rest;
use crate::env;
use crate::keys::identity::EnsealIdentity;
use crate::keys::store::KeyStore;
use crate::ui::display;

#[derive(Args)]
pub struct DecryptArgs {
    /// Path to encrypted .env file
    #[arg(default_value = ".env.encrypted")]
    pub file: String,

    /// Output path (default: strip .encrypted suffix, or <file>.decrypted)
    #[arg(long, short)]
    pub output: Option<String>,

    /// Overwrite existing files without prompting
    #[arg(long)]
    pub force: bool,
}

pub fn run(args: DecryptArgs) -> Result<()> {
    let raw_content = std::fs::read(&args.file)
        .map_err(|e| anyhow::anyhow!("failed to read '{}': {}", args.file, e))?;

    // Auto-detect format before loading identity (fail fast on unencrypted files)
    let is_whole_file = at_rest::is_age_encrypted(&raw_content);

    let text = if !is_whole_file {
        let t = String::from_utf8(raw_content.clone())
            .map_err(|_| anyhow::anyhow!("file is not valid UTF-8 and not age-encrypted"))?;
        if !at_rest::is_per_var_encrypted(&t) {
            anyhow::bail!(
                "file '{}' doesn't appear to be encrypted (not age format, no ENC[age:...] values)",
                args.file
            );
        }
        Some(t)
    } else {
        None
    };

    let store = KeyStore::open()?;
    let identity = EnsealIdentity::load(&store)?;

    if is_whole_file {
        decrypt_whole_file(&args, &raw_content, &identity)
    } else {
        decrypt_per_var(&args, text.as_ref().unwrap(), &identity)
    }
}

fn decrypt_whole_file(
    args: &DecryptArgs,
    ciphertext: &[u8],
    identity: &EnsealIdentity,
) -> Result<()> {
    let plaintext = at_rest::decrypt_whole_file(ciphertext, &identity.age_identity)?;

    let output_path = args.output.clone().unwrap_or_else(|| {
        if args.file.ends_with(".encrypted") {
            args.file.trim_end_matches(".encrypted").to_string()
        } else {
            format!("{}.decrypted", args.file)
        }
    });

    check_overwrite(&output_path, args.force)?;

    write_secret_file(&output_path, &plaintext)
        .map_err(|e| anyhow::anyhow!("failed to write '{}': {}", output_path, e))?;

    let env_file = env::parser::parse(&String::from_utf8_lossy(&plaintext)).ok();
    let var_count = env_file.map(|e| e.var_count()).unwrap_or(0);

    if var_count > 0 {
        display::ok(&format!(
            "{} decrypted ({} variables)",
            output_path, var_count
        ));
    } else {
        display::ok(&format!("{} decrypted", output_path));
    }

    Ok(())
}

/// Write a file containing secrets with restrictive permissions (0600 on Unix).
fn write_secret_file(path: &str, content: &[u8]) -> Result<()> {
    #[cfg(unix)]
    {
        use std::fs::OpenOptions;
        use std::io::Write;
        use std::os::unix::fs::OpenOptionsExt;
        let mut file = OpenOptions::new()
            .write(true)
            .create(true)
            .truncate(true)
            .mode(0o600)
            .open(path)?;
        file.write_all(content)?;
    }
    #[cfg(not(unix))]
    {
        std::fs::write(path, content)?;
    }
    Ok(())
}

fn decrypt_per_var(args: &DecryptArgs, content: &str, identity: &EnsealIdentity) -> Result<()> {
    let env_file = env::parser::parse(content)?;
    let decrypted = at_rest::decrypt_per_var(&env_file, &identity.age_identity)?;
    let output_str = decrypted.to_string();

    let output_path = args.output.clone().unwrap_or_else(|| args.file.clone());

    check_overwrite(&output_path, args.force)?;

    write_secret_file(&output_path, output_str.as_bytes())
        .map_err(|e| anyhow::anyhow!("failed to write '{}': {}", output_path, e))?;

    display::ok(&format!(
        "{} decrypted ({} variables)",
        output_path,
        decrypted.var_count()
    ));

    Ok(())
}

/// Check if the target file exists and handle overwrite confirmation.
fn check_overwrite(path: &str, force: bool) -> Result<()> {
    if !std::path::Path::new(path).exists() {
        return Ok(());
    }
    if force {
        return Ok(());
    }
    if !is_terminal::is_terminal(std::io::stdin()) {
        bail!(
            "'{}' already exists. Use --force to overwrite in non-interactive mode",
            path
        );
    }
    let confirm = dialoguer::Confirm::new()
        .with_prompt(format!("'{}' already exists. Overwrite?", path))
        .default(false)
        .interact()?;
    if !confirm {
        bail!("aborted: not overwriting '{}'", path);
    }
    Ok(())
}