Add creating an introducer from a files

- Introducers can now be created by specifying a file. The certificate
  gets imported and declared as an introducer for the passed domains.
- Add some checks, so that the imported certificate can actually be used
  as an introducer (certificate is alive, not revoked, has certification
  capabilities)

src/cli/cli_args.rs

@@ -80,9 +80,18 @@ pub enum IntroducerSubcommand {
 pub struct IntroducerAddCommand {
     #[clap(
         long = "cert",
-        help = "Certificate to declare as introducer."
+        help = "Certificate to declare as introducer.",
+        conflicts_with = "cert_file"
     )]
-    pub cert: String,
+    pub cert: Option<String>,
+
+    #[clap(
+        long = "cert-file",
+        help = "Import certificate from CERT_FILE and declare it as introducer.",
+        value_name = "CERT_FILE",
+        conflicts_with = "cert"
+    )]
+    pub cert_file: Option<String>,
 
     #[clap(
         long = "domains",
@@ -146,7 +155,7 @@ pub struct LocalAddCommand {
         long = "cert",
         help = "Certificate to add."
     )]
-    pub cert: String,
+    pub cert_file: String,
 }
 
 #[derive(Parser, Debug)]

src/commands.rs

@@ -16,6 +16,10 @@ pub enum CommandError {
     CertNotFound(Fingerprint),
     #[error("Certificate not usable: {0}")]
     CertNotUsable(Fingerprint),
+    #[error("Certificate {0} is not alive (is expired or created in the future)")]
+    CertNotAlive(Fingerprint),
+    #[error("Certificate is revoked: {0}")]
+    CertRevoked(Fingerprint),
 }
 
 pub async fn dispatch(cli: CliArgs, config: HuskConfigContainer) -> Result<()> {

src/commands/introducer/add.rs

@@ -3,10 +3,14 @@
 use anyhow::Result;
 use sequoia_cert_store::Store;
 use sequoia_openpgp::cert::ValidCert;
+use sequoia_openpgp::cert;
+use sequoia_openpgp::parse::Parse;
 use sequoia_openpgp::{Fingerprint, KeyHandle};
+use sequoia_openpgp::types::RevocationStatus;
 
 use crate::cli::cli_args::IntroducerAddCommand;
 use crate::commands::CommandError;
+use crate::common::crypto;
 use crate::config::HuskConfigContainer;
 use crate::types::husk_context::HuskContext;
 use crate::types::introducer::Introducer;
@@ -14,29 +18,46 @@ use crate::types::introducer::Introducer;
 pub async fn dispatch(cmd: IntroducerAddCommand, config: HuskConfigContainer) -> Result<()> {
     println!("add");
     println!("   {:?}", cmd.cert);
+    println!("   {:?}", cmd.cert_file);
     println!("   {:?}", cmd.domains);
 
     let context = HuskContext::new(&config.into())?;
     let policy = &context.policy;
     let cert_store = &context.cert_store;
 
-    // Get the certificate
-    let fpr = Fingerprint::from_hex(&cmd.cert)?;
-    let certs = cert_store.lookup_by_cert(&KeyHandle::try_from(&fpr)?)
-        .map_err(|_| CommandError::CertNotFound(fpr.clone()))?;
+    if let Some(cert_file) = cmd.cert_file {
+        let c = cert::Cert::from_file(cert_file)?;
+        let vc = c.with_policy(policy, None)?;
 
-    let certs: Vec<ValidCert> = certs.iter()
-        .filter_map(|c|
-            c.with_policy(policy, None).ok()
-        )
-        .collect();
+        // guards
+        if vc.alive().is_err() {
+            return Err(CommandError::CertNotAlive(vc.fingerprint()).into());
+        }
+        if matches!(vc.revocation_status(), RevocationStatus::Revoked(_)) {
+            return Err(CommandError::CertRevoked(vc.fingerprint()).into());
+        }
+        if !crypto::has_certification_capability(&vc) {
+            return Err(CommandError::CertNotUsable(vc.fingerprint()).into());
+        }
 
-    if let Some(cert) = certs.first() {
-        Introducer::create(&context, cert, cmd.domains)?;
-    } else {
-        return Err(CommandError::CertNotUsable(fpr).into());
+        Introducer::create(&context, &vc, cmd.domains)?;
+    } else if let Some(cert) = cmd.cert {
+        let fpr = Fingerprint::from_hex(cert.as_str())?;
+        let certs = cert_store.lookup_by_cert(&KeyHandle::try_from(&fpr)?)
+            .map_err(|_| CommandError::CertNotFound(fpr.clone()))?;
+
+        let certs: Vec<ValidCert> = certs.iter()
+            .filter_map(|c|
+                c.with_policy(policy, None).ok()
+            )
+            .collect();
+
+        if let Some(cert) = certs.first() {
+            Introducer::create(&context, &cert, cmd.domains)?;
+        } else {
+            return Err(CommandError::CertNotUsable(fpr).into());
+        }
     }
-
     Ok(())
 }
 

src/commands/local/add.rs

@@ -5,7 +5,7 @@ use crate::config::HuskConfigContainer;
 
 pub async fn dispatch(cmd: LocalAddCommand, _config: &HuskConfigContainer) -> Result<()> {
     println!("add");
-    println!("   {:?}", cmd.cert);
+    println!("   {:?}", cmd.cert_file);
     Ok(())
 }
 

src/common/crypto.rs

@@ -472,6 +472,15 @@ pub fn authenticate(context: &HuskContext, cert: &ValidCert, activate: bool, dom
     Ok(())
 }
 
+pub fn has_certification_capability(cert: &ValidCert) -> bool {
+    cert.keys()
+        .for_certification()
+        .alive()
+        .supported()
+        .revoked(false)
+        .count() > 0
+}
+
 #[cfg(test)]
 pub mod tests {