poc: App & API Protection #695
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| use std::env; | ||
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| use crate::config::Config; | ||
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| mod payload; | ||
| pub mod processor; | ||
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| #[must_use] | ||
| pub const fn is_enabled(config: &Config) -> bool { | ||
| config.serverless_appsec_enabled | ||
| } | ||
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| /// Reads the `DD_APM_TRACING_ENABLED` environment variable to determine whether ASM runs in | ||
| /// standalone mode. | ||
| /// | ||
| /// This is a direct port of the Go logic and that is why we are not using the | ||
| /// `config` crate. | ||
| #[must_use] | ||
| pub fn is_standalone() -> bool { | ||
| let apm_tracing_enabled = env::var("DD_APM_TRACING_ENABLED"); | ||
| let is_set = apm_tracing_enabled.is_ok(); | ||
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| let enabled = apm_tracing_enabled | ||
| .unwrap_or("false".to_string()) | ||
| .to_lowercase() | ||
| == "true"; | ||
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| is_set && enabled | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| use base64::Engine; | ||
| use bytes::Buf; | ||
| use libddwaf::object::{WafMap, WafObject, WafString}; | ||
| use mime::Mime; | ||
| use tracing::{debug, warn}; | ||
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| pub(super) async fn parse_body( | ||
| body: impl AsRef<[u8]>, | ||
| is_base64_encoded: bool, | ||
| content_type: Option<&str>, | ||
| ) -> Result<Option<WafObject>, Box<dyn std::error::Error>> { | ||
| if is_base64_encoded { | ||
| let body = base64::engine::general_purpose::STANDARD.decode(body)?; | ||
| return Box::pin(parse_body(body, false, content_type)).await; | ||
| } | ||
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| let body = body.as_ref(); | ||
| let mime_type = match content_type | ||
| .unwrap_or("application/json") | ||
| .parse::<mime::Mime>() | ||
| { | ||
| Ok(mime) => mime, | ||
| Err(e) => return Err(e.into()), | ||
| }; | ||
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Comment on lines
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There was a problem hiding this comment. Would this actually error at any moment since we're always setting the default as There was a problem hiding this comment. You can't assume the body is even valid JSON -- it comes from the client-side of the chain... Folks make mistakes! |
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| Ok(match (mime_type.type_(), mime_type.subtype()) { | ||
| // text/json | application/json | application/vnd.api+json | ||
| (mime::APPLICATION, sub) if sub == mime::JSON || sub == "vnd.api+json" => { | ||
| Some(serde_json::from_slice(body)?) | ||
| } | ||
| (mime::APPLICATION, mime::WWW_FORM_URLENCODED) => Some(serde_html_form::from_bytes(body)?), | ||
| (mime::APPLICATION | mime::TEXT, mime::XML) => { | ||
| Some(serde_xml_rs::from_reader(body.reader())?) | ||
| } | ||
| (mime::MULTIPART, mime::FORM_DATA) => { | ||
| let Some(boundary) = mime_type.get_param("boundary") else { | ||
| warn!("appsec: cannot attempt parsing multipart/form-data without boundary"); | ||
| return Ok(None); | ||
| }; | ||
| // We have to go through this dance because [`multer::Multipart`] requires an async stream. | ||
| let body = body.to_vec(); | ||
| let reader = futures::stream::iter([Result::<Vec<u8>, std::io::Error>::Ok(body)]); | ||
| let mut multipart = multer::Multipart::new(reader, boundary.as_str()); | ||
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| let mut fields = Vec::new(); | ||
| while let Some(field) = multipart.next_field().await? { | ||
| let Some(name) = field.name().map(str::to_string) else { | ||
| continue; | ||
| }; | ||
| let Some(content_type) = field.content_type().map(Mime::to_string) else { | ||
| continue; | ||
| }; | ||
| let Some(value) = Box::pin(parse_body( | ||
| field.bytes().await?, | ||
| false, | ||
| Some(content_type.as_ref()), | ||
| )) | ||
| .await? | ||
| else { | ||
| continue; | ||
| }; | ||
| fields.push((name, value)); | ||
| } | ||
| let mut res = WafMap::new(fields.len() as u64); | ||
| for (i, (name, value)) in fields.into_iter().enumerate() { | ||
| res[i] = (name.as_str(), value).into(); | ||
| } | ||
| Some(res.into()) | ||
| } | ||
| (mime::TEXT, mime::PLAIN) => Some(WafString::new(body).into()), | ||
| _ => { | ||
| debug!("appsec: unsupported content type: {mime_type}"); | ||
| None | ||
| } | ||
| }) | ||
| } | ||
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