yara-x 1.15.0

A pure Rust implementation of YARA.
Documentation 
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use crate::compiler::RegexpId;
use crate::modules::prelude::*;
use crate::modules::protos::cuckoo::*;

mod schema;
#[cfg(test)]
mod tests;

use std::cell::RefCell;
use std::rc::Rc;
thread_local! {
    static LOCAL_DATA: RefCell<Option<Rc<schema::CuckooJson>>> = const { RefCell::new(None) };
}

fn get_local() -> Option<Rc<schema::CuckooJson>> {
    LOCAL_DATA.with(|data| data.borrow().clone())
}

fn set_local(value: schema::CuckooJson) {
    LOCAL_DATA.with(|data| {
        *data.borrow_mut() = Some(Rc::new(value));
    });
}

#[module_main]
fn main(_data: &[u8], meta: Option<&[u8]>) -> Result<Cuckoo, ModuleError> {
    let meta = match meta {
        None | Some([]) => {
            set_local(schema::CuckooJson::default());
            return Ok(Cuckoo::new());
        }
        Some(meta) => meta,
    };

    match serde_json::from_slice::<schema::CuckooJson>(meta) {
        Ok(parsed) => {
            set_local(parsed);
        }
        Err(e) => {
            set_local(schema::CuckooJson::default());
            return Err(ModuleError::MetadataError { err: e.to_string() });
        }
    };

    Ok(Cuckoo::new())
}

/// Returns true if the Cuckoo report contains a DNS lookup where the domain
/// matches the given regular expression.
#[module_export(name = "network.dns_lookup")]
fn network_dns_lookup_r(ctx: &ScanContext, regexp_id: RegexpId) -> i64 {
    get_local()
        .as_ref()
        .and_then(|local| local.network.as_ref())
        .and_then(|network| network.domains.as_ref())
        .map(|domains| {
            domains
                .iter()
                .filter(|domain| {
                    matches!(&domain.domain, Some(domain_domain) if ctx.regexp_matches(regexp_id, domain_domain.as_bytes()))
                })
                .count() as i64
        })
        .unwrap_or(0)
}

/// Returns true if the Cuckoo report contains an HTTP request (either, GET,
/// or any other method) to some URI that matches the given regular expression.
#[module_export(name = "network.http_request")]
fn network_http_request_r(ctx: &ScanContext, regexp_id: RegexpId) -> i64 {
    get_local()
        .as_ref()
        .and_then(|local| local.network.as_ref())
        .and_then(|network| network.http.as_ref())
        .map(|http| {
            http.iter()
                .filter(|http| {
                    http.method.is_some() // ~> is request (is not response)
                        && matches!(&http.uri, Some(uri) if ctx.regexp_matches(regexp_id, uri.as_bytes()))
                })
                .count() as i64
        })
        .unwrap_or(0)
}

/// Returns true if the Cuckoo report contains an HTTP GET request to some URI
/// that matches the given regular expression.
#[module_export(name = "network.http_get")]
fn network_http_get_r(ctx: &ScanContext, regexp_id: RegexpId) -> i64 {
    get_local()
        .as_ref()
        .and_then(|local| local.network.as_ref())
        .and_then(|network| network.http.as_ref())
        .map(|http| {
            http.iter()
                .filter(|http| {
                    http.method
                        .as_ref()
                        .map(|method| method.eq_ignore_ascii_case("get"))
                        .unwrap_or(false)
                        && matches!(&http.uri, Some(uri) if ctx.regexp_matches(regexp_id, uri.as_bytes()))
                })
                .count() as i64
        })
        .unwrap_or(0)
}

/// Returns true if the Cuckoo report contains an HTTP POST request to some URI
/// that matches the given regular expression.
#[module_export(name = "network.http_post")]
fn network_http_post_r(ctx: &ScanContext, regexp_id: RegexpId) -> i64 {
    get_local()
        .as_ref()
        .and_then(|local| local.network.as_ref())
        .and_then(|network| network.http.as_ref())
        .map(|http| {
            http.iter()
                .filter(|http| {
                    http.method
                        .as_ref()
                        .map(|method| method.eq_ignore_ascii_case("post"))
                        .unwrap_or(false)
                        && matches!(&http.uri, Some(uri) if ctx.regexp_matches(regexp_id, uri.as_bytes()))
                })
                .count() as i64
        })
        .unwrap_or(0)
}

/// Returns true if the Cuckoo report contains an HTTP where the User-Agent
/// header matches the given regular expression.
#[module_export(name = "network.http_user_agent")]
fn network_http_user_agent_r(ctx: &ScanContext, regexp_id: RegexpId) -> i64 {
    get_local()
        .as_ref()
        .and_then(|local| local.network.as_ref())
        .and_then(|network| network.http.as_ref())
        .map(|http| {
            http.iter()
                .flat_map(|http| http.user_agent.iter())
                .filter(|user_agent| {
                    ctx.regexp_matches(regexp_id, user_agent.as_bytes())
                })
                .count() as i64
        })
        .unwrap_or(0)
}

/// Returns true if the Cuckoo report contains some TCP connection to the
/// destination `port` where the destination domain matches the given regular
/// expression
#[module_export(name = "network.tcp")]
fn network_tcp_ri(ctx: &ScanContext, dst_re: RegexpId, port: i64) -> i64 {
    get_local()
        .as_ref()
        .and_then(|local| local.network.as_ref())
        .and_then(|network| network.tcp.as_ref())
        .map(|tcp| {
            tcp.iter()
                .filter(|tcp| {
                    matches!(tcp.dport, Some(dport) if {
                        dport == port as u64
                            && tcp
                                .dst
                                .iter()
                                .chain(tcp.dst_domain.iter())
                                .any(|dst| ctx.regexp_matches(dst_re, dst.as_bytes()))
                    })
                })
                .count() as i64
        })
        .unwrap_or(0)
}

/// Returns true if the Cuckoo report contains some UDP connection to the
/// destination `port` where the destination domain matches the given regular
/// expression
#[module_export(name = "network.udp")]
fn network_udp_ri(ctx: &ScanContext, dst_re: RegexpId, port: i64) -> i64 {
    get_local()
        .as_ref()
        .and_then(|local| local.network.as_ref())
        .and_then(|network| network.udp.as_ref())
        .map(|udp| {
            udp.iter()
                .filter(|udp| matches!(udp.dport, Some(dport) if {
                    dport == port as u64
                        && udp
                            .dst
                            .iter()
                            .chain(udp.dst_domain.iter())
                            .any(|dst| ctx.regexp_matches(dst_re, dst.as_bytes()))
                }))
                .count() as i64
        })
        .unwrap_or(0)
}

/// Returns true if the Cuckoo report contains an HTTP request where the Host
/// header matches the given regular expression.
#[module_export(name = "network.host")]
fn network_host_r(ctx: &ScanContext, re: RegexpId) -> i64 {
    get_local()
        .as_ref()
        .and_then(|local| local.network.as_ref())
        .and_then(|network| network.hosts.as_ref())
        .map(|hosts| {
            hosts
                .iter()
                .filter(|host| ctx.regexp_matches(re, host.as_bytes()))
                .count() as i64
        })
        .unwrap_or(0)
}

/// Returns true if the Cuckoo contains some mutex operation where the name
/// of the mutex matches the given regular expression.
#[module_export(name = "sync.mutex")]
fn sync_mutex_r(ctx: &ScanContext, mutex_re: RegexpId) -> i64 {
    get_local()
        .as_ref()
        .and_then(|local| local.behavior.as_ref())
        .and_then(|behavior| behavior.summary.as_ref())
        .map(|summary| {
            summary
                .mutexes
                .iter()
                .flatten()
                .filter(|mutex| ctx.regexp_matches(mutex_re, mutex.as_bytes()))
                .count() as i64
        })
        .unwrap_or(0)
}

/// Returns true if the Cuckoo contains some file access operation where the
/// file path matches the given regular expression.
#[module_export(name = "filesystem.file_access")]
fn filesystem_file_access_r(ctx: &ScanContext, regexp_id: RegexpId) -> i64 {
    get_local()
        .as_ref()
        .and_then(|local| local.behavior.as_ref())
        .and_then(|behavior| behavior.summary.as_ref())
        .map(|summary| {
            summary
                .files
                .iter()
                .flatten()
                .filter(|file| ctx.regexp_matches(regexp_id, file.as_bytes()))
                .count() as i64
        })
        .unwrap_or(0)
}

/// Returns true if the Cuckoo contains some registry access operation where
/// the registry key matches the given regular expression.
#[module_export(name = "registry.key_access")]
fn registry_key_access_r(ctx: &ScanContext, regexp_id: RegexpId) -> i64 {
    get_local()
        .as_ref()
        .and_then(|local| local.behavior.as_ref())
        .and_then(|behavior| behavior.summary.as_ref())
        .map(|summary| {
            summary
                .keys
                .iter()
                .flatten()
                .filter(|key| ctx.regexp_matches(regexp_id, key.as_bytes()))
                .count() as i64
        })
        .unwrap_or(0)
}