diff --git a/Cargo.lock b/Cargo.lock index 8630855..40d2a29 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -403,6 +403,7 @@ dependencies = [ "rand", "rmp-serde 0.15.5", "serde", + "serde_bytes", "sled", "structopt", "tokio", diff --git a/src/api/api_server.rs b/src/api/api_server.rs index cd866c9..42987e7 100644 --- a/src/api/api_server.rs +++ b/src/api/api_server.rs @@ -109,11 +109,9 @@ async fn handler_inner(garage: Arc, req: Request) -> Result { - return handle_request_without_bucket(garage, req, api_key, endpoint).await - } - Authorization::Read(bucket) | Authorization::Write(bucket) => bucket.to_string(), + let bucket_name = match endpoint.get_bucket() { + None => return handle_request_without_bucket(garage, req, api_key, endpoint).await, + Some(bucket) => bucket.to_string(), }; let bucket_id = resolve_bucket(&garage, &bucket_name, &api_key).await?; diff --git a/src/api/s3_bucket.rs b/src/api/s3_bucket.rs index dc131a3..4a497c6 100644 --- a/src/api/s3_bucket.rs +++ b/src/api/s3_bucket.rs @@ -67,7 +67,7 @@ pub async fn handle_list_buckets(garage: &Garage, api_key: &Key) -> Result { "Invalid bucket name: {}. See AWS documentation for constraints on S3 bucket names:\nhttps://docs.aws.amazon.com/AmazonS3/latest/userguide/bucketnamingrules.html" }; } + #[derive(Debug, Serialize, Deserialize)] pub enum AdminRpc { BucketOperation(BucketOperation), @@ -142,14 +145,14 @@ impl AdminRpcHandler { })); alias } - None => BucketAlias::new(name.clone(), bucket.id), + None => BucketAlias::new(name.clone(), bucket.id) + .ok_or_message(format!(INVALID_BUCKET_NAME_MESSAGE!(), name))?, }; - bucket - .state - .as_option_mut() - .unwrap() - .aliases - .update_in_place(name.clone(), true); + bucket.state.as_option_mut().unwrap().aliases.merge_raw( + name, + alias.state.timestamp(), + &true, + ); self.garage.bucket_table.insert(&bucket).await?; self.garage.bucket_alias_table.insert(&alias).await?; Ok(AdminRpc::Ok(format!("Bucket {} was created.", name))) @@ -222,7 +225,7 @@ impl AdminRpcHandler { // 2. delete bucket alias bucket_alias.state.update(Deletable::Deleted); self.garage.bucket_alias_table.insert(&bucket_alias).await?; - // 3. delete bucket alias + // 3. delete bucket bucket.state = Deletable::delete(); self.garage.bucket_table.insert(&bucket).await?; @@ -259,15 +262,36 @@ impl AdminRpcHandler { } } - key_param.local_aliases = key_param - .local_aliases - .update_mutator(query.new_name.clone(), Deletable::present(bucket_id)); + if !is_valid_bucket_name(&query.new_name) { + return Err(Error::Message(format!( + INVALID_BUCKET_NAME_MESSAGE!(), + query.new_name + ))); + } + + // Checks ok, add alias + let mut bucket_p = bucket.state.as_option_mut().unwrap(); + let bucket_p_local_alias_key = (key.key_id.clone(), query.new_name.clone()); + + // Calculate the timestamp to assign to this aliasing in the two local_aliases maps + // (the one from key to bucket, and the reverse one stored in the bucket iself) + // so that merges on both maps in case of a concurrent operation resolve + // to the same alias being set + let alias_ts = increment_logical_clock_2( + key_param.local_aliases.get_timestamp(&query.new_name), + bucket_p + .local_aliases + .get_timestamp(&bucket_p_local_alias_key), + ); + + key_param.local_aliases = LwwMap::raw_item( + query.new_name.clone(), + alias_ts, + Deletable::present(bucket_id), + ); self.garage.key_table.insert(&key).await?; - let mut bucket_p = bucket.state.as_option_mut().unwrap(); - bucket_p.local_aliases = bucket_p - .local_aliases - .update_mutator((key.key_id.clone(), query.new_name.clone()), true); + bucket_p.local_aliases = LwwMap::raw_item(bucket_p_local_alias_key, alias_ts, true); self.garage.bucket_table.insert(&bucket).await?; Ok(AdminRpc::Ok(format!( @@ -275,40 +299,47 @@ impl AdminRpcHandler { query.new_name, bucket_id, key.key_id ))) } else { - let mut alias = self + let alias = self .garage .bucket_alias_table .get(&EmptyKey, &query.new_name) - .await? - .unwrap_or(BucketAlias { - name: query.new_name.clone(), - state: Lww::new(Deletable::delete()), - }); + .await?; - if let Some(existing_alias) = alias.state.get().as_option() { - if existing_alias.bucket_id == bucket_id { - return Ok(AdminRpc::Ok(format!( - "Alias {} already points to bucket {:?}", - query.new_name, bucket_id - ))); - } else { - return Err(Error::Message(format!( - "Alias {} already exists and points to different bucket: {:?}", - query.new_name, existing_alias.bucket_id - ))); + if let Some(existing_alias) = alias.as_ref() { + if let Some(p) = existing_alias.state.get().as_option() { + if p.bucket_id == bucket_id { + return Ok(AdminRpc::Ok(format!( + "Alias {} already points to bucket {:?}", + query.new_name, bucket_id + ))); + } else { + return Err(Error::Message(format!( + "Alias {} already exists and points to different bucket: {:?}", + query.new_name, p.bucket_id + ))); + } } } // Checks ok, add alias - alias - .state - .update(Deletable::present(AliasParams { bucket_id })); + let mut bucket_p = bucket.state.as_option_mut().unwrap(); + + let alias_ts = increment_logical_clock_2( + bucket_p.aliases.get_timestamp(&query.new_name), + alias.as_ref().map(|a| a.state.timestamp()).unwrap_or(0), + ); + + let alias = match alias { + None => BucketAlias::new(query.new_name.clone(), bucket_id) + .ok_or_message(format!(INVALID_BUCKET_NAME_MESSAGE!(), query.new_name))?, + Some(mut a) => { + a.state = Lww::raw(alias_ts, Deletable::present(AliasParams { bucket_id })); + a + } + }; self.garage.bucket_alias_table.insert(&alias).await?; - let mut bucket_p = bucket.state.as_option_mut().unwrap(); - bucket_p.aliases = bucket_p - .aliases - .update_mutator(query.new_name.clone(), true); + bucket_p.aliases = LwwMap::raw_item(query.new_name.clone(), alias_ts, true); self.garage.bucket_table.insert(&bucket).await?; Ok(AdminRpc::Ok(format!( @@ -336,14 +367,14 @@ impl AdminRpcHandler { .bucket_helper() .get_existing_bucket(bucket_id) .await?; - let mut bucket_state = bucket.state.as_option_mut().unwrap(); + let mut bucket_p = bucket.state.as_option_mut().unwrap(); - let has_other_aliases = bucket_state + let has_other_aliases = bucket_p .aliases .items() .iter() .any(|(_, _, active)| *active) - || bucket_state + || bucket_p .local_aliases .items() .iter() @@ -352,15 +383,22 @@ impl AdminRpcHandler { return Err(Error::Message(format!("Bucket {} doesn't have other aliases, please delete it instead of just unaliasing.", query.name))); } + // Checks ok, remove alias let mut key_param = key.state.as_option_mut().unwrap(); - key_param.local_aliases = key_param - .local_aliases - .update_mutator(query.name.clone(), Deletable::delete()); + let bucket_p_local_alias_key = (key.key_id.clone(), query.name.clone()); + + let alias_ts = increment_logical_clock_2( + key_param.local_aliases.get_timestamp(&query.name), + bucket_p + .local_aliases + .get_timestamp(&bucket_p_local_alias_key), + ); + + key_param.local_aliases = + LwwMap::raw_item(query.name.clone(), alias_ts, Deletable::delete()); self.garage.key_table.insert(&key).await?; - bucket_state.local_aliases = bucket_state - .local_aliases - .update_mutator((key.key_id.clone(), query.name.clone()), false); + bucket_p.local_aliases = LwwMap::raw_item(bucket_p_local_alias_key, alias_ts, false); self.garage.bucket_table.insert(&bucket).await?; Ok(AdminRpc::Ok(format!( @@ -401,12 +439,17 @@ impl AdminRpcHandler { .get(&EmptyKey, &query.name) .await? .ok_or_message("Internal error: alias not found")?; - alias.state.update(Deletable::delete()); + + // Checks ok, remove alias + let alias_ts = increment_logical_clock_2( + alias.state.timestamp(), + bucket_state.aliases.get_timestamp(&query.name), + ); + + alias.state = Lww::raw(alias_ts, Deletable::delete()); self.garage.bucket_alias_table.insert(&alias).await?; - bucket_state.aliases = bucket_state - .aliases - .update_mutator(query.name.clone(), false); + bucket_state.aliases = LwwMap::raw_item(query.name.clone(), alias_ts, false); self.garage.bucket_table.insert(&bucket).await?; Ok(AdminRpc::Ok(format!("Bucket alias {} deleted", query.name))) @@ -494,7 +537,13 @@ impl AdminRpcHandler { )); } - bucket_state.website_access.update(query.allow); + let website = if query.allow { + Some(ByteBuf::from(DEFAULT_WEBSITE_CONFIGURATION.to_vec())) + } else { + None + }; + + bucket_state.website_config.update(website); self.garage.bucket_table.insert(&bucket).await?; let msg = if query.allow { diff --git a/src/garage/cli/cmd.rs b/src/garage/cli/cmd.rs index 1c64f9b..834261e 100644 --- a/src/garage/cli/cmd.rs +++ b/src/garage/cli/cmd.rs @@ -167,7 +167,7 @@ pub async fn cmd_admin( let mut table = vec![]; for alias in bl { if let Some(p) = alias.state.get().as_option() { - table.push(format!("\t{}\t{:?}", alias.name, p.bucket_id)); + table.push(format!("\t{}\t{:?}", alias.name(), p.bucket_id)); } } format_table(table); diff --git a/src/garage/cli/util.rs b/src/garage/cli/util.rs index ad48c30..b4ea14d 100644 --- a/src/garage/cli/util.rs +++ b/src/garage/cli/util.rs @@ -82,7 +82,7 @@ pub fn print_bucket_info(bucket: &Bucket, relevant_keys: &HashMap) match &bucket.state { Deletable::Deleted => println!("Bucket is deleted."), Deletable::Present(p) => { - println!("Website access: {}", p.website_access.get()); + println!("Website access: {}", p.website_config.get().is_some()); println!("\nGlobal aliases:"); for (alias, _, active) in p.aliases.items().iter() { diff --git a/src/model/bucket_alias_table.rs b/src/model/bucket_alias_table.rs index 52484c5..904a525 100644 --- a/src/model/bucket_alias_table.rs +++ b/src/model/bucket_alias_table.rs @@ -8,7 +8,7 @@ use garage_util::data::*; /// in the global namespace. #[derive(PartialEq, Clone, Debug, Serialize, Deserialize)] pub struct BucketAlias { - pub name: String, + name: String, pub state: crdt::Lww>, } @@ -22,15 +22,22 @@ impl AutoCrdt for AliasParams { } impl BucketAlias { - pub fn new(name: String, bucket_id: Uuid) -> Self { - BucketAlias { - name, - state: crdt::Lww::new(crdt::Deletable::present(AliasParams { bucket_id })), + pub fn new(name: String, bucket_id: Uuid) -> Option { + if !is_valid_bucket_name(&name) { + None + } else { + Some(BucketAlias { + name, + state: crdt::Lww::new(crdt::Deletable::present(AliasParams { bucket_id })), + }) } } pub fn is_deleted(&self) -> bool { self.state.get().is_deleted() } + pub fn name(&self) -> &str { + &self.name + } } impl Crdt for BucketAlias { @@ -62,3 +69,29 @@ impl TableSchema for BucketAliasTable { filter.apply(entry.is_deleted()) } } + +/// Check if a bucket name is valid. +/// +/// The requirements are listed here: +/// +/// +/// +/// In the case of Garage, bucket names must not be hex-encoded +/// 32 byte string, which is excluded thanks to the +/// maximum length of 63 bytes given in the spec. +pub fn is_valid_bucket_name(n: &str) -> bool { + // Bucket names must be between 3 and 63 characters + n.len() >= 3 && n.len() <= 63 + // Bucket names must be composed of lowercase letters, numbers, + // dashes and dots + && n.chars().all(|c| matches!(c, '.' | '-' | 'a'..='z' | '0'..='9')) + // Bucket names must start and end with a letter or a number + && !n.starts_with(&['-', '.'][..]) + && !n.ends_with(&['-', '.'][..]) + // Bucket names must not be formated as an IP address + && n.parse::().is_err() + // Bucket names must not start wih "xn--" + && !n.starts_with("xn--") + // Bucket names must not end with "-s3alias" + && !n.ends_with("-s3alias") +} diff --git a/src/model/bucket_helper.rs b/src/model/bucket_helper.rs index c1280af..b55ebc4 100644 --- a/src/model/bucket_helper.rs +++ b/src/model/bucket_helper.rs @@ -8,12 +8,21 @@ use crate::garage::Garage; pub struct BucketHelper<'a>(pub(crate) &'a Garage); -#[allow(clippy::ptr_arg)] impl<'a> BucketHelper<'a> { + #[allow(clippy::ptr_arg)] pub async fn resolve_global_bucket_name( &self, bucket_name: &String, ) -> Result, Error> { + // Bucket names in Garage are aliases, true bucket identifiers + // are 32-byte UUIDs. This function resolves bucket names into + // their full identifier by looking up in the bucket_alias_table. + // This function also allows buckets to be identified by their + // full UUID (hex-encoded). Here, if the name to be resolved is a + // hex string of the correct length, it is directly parsed as a bucket + // identifier which is returned. There is no risk of this conflicting + // with an actual bucket name: bucket names are max 63 chars long by + // the AWS spec, and hex-encoded UUIDs are 64 chars long. let hexbucket = hex::decode(bucket_name.as_str()) .ok() .map(|by| Uuid::try_from(&by)) @@ -37,7 +46,6 @@ impl<'a> BucketHelper<'a> { } } - #[allow(clippy::ptr_arg)] pub async fn get_existing_bucket(&self, bucket_id: Uuid) -> Result { self.0 .bucket_table diff --git a/src/model/bucket_table.rs b/src/model/bucket_table.rs index 6ae719a..00e0389 100644 --- a/src/model/bucket_table.rs +++ b/src/model/bucket_table.rs @@ -8,6 +8,8 @@ use garage_util::time::*; use crate::permission::BucketKeyPerm; +pub const DEFAULT_WEBSITE_CONFIGURATION: &[u8] = b""; // TODO (an XML WebsiteConfiguration document per the AWS spec) + /// A bucket is a collection of objects /// /// Its parameters are not directly accessible as: @@ -29,9 +31,8 @@ pub struct BucketParams { /// Map of key with access to the bucket, and what kind of access they give pub authorized_keys: crdt::Map, /// Whether this bucket is allowed for website access - /// (under all of its global alias names) - pub website_access: crdt::Lww, - /// The website configuration XML document + /// (under all of its global alias names), + /// and if so, the website configuration XML document pub website_config: crdt::Lww>, /// Map of aliases that are or have been given to this bucket /// in the global namespace @@ -50,7 +51,6 @@ impl BucketParams { BucketParams { creation_date: now_msec(), authorized_keys: crdt::Map::new(), - website_access: crdt::Lww::new(false), website_config: crdt::Lww::new(None), aliases: crdt::LwwMap::new(), local_aliases: crdt::LwwMap::new(), @@ -61,7 +61,6 @@ impl BucketParams { impl Crdt for BucketParams { fn merge(&mut self, o: &Self) { self.authorized_keys.merge(&o.authorized_keys); - self.website_access.merge(&o.website_access); self.website_config.merge(&o.website_config); self.aliases.merge(&o.aliases); self.local_aliases.merge(&o.local_aliases); diff --git a/src/model/key_table.rs b/src/model/key_table.rs index 526ed49..3285e35 100644 --- a/src/model/key_table.rs +++ b/src/model/key_table.rs @@ -190,7 +190,7 @@ impl TableSchema for KeyTable { local_aliases: crdt::LwwMap::new(), }) }; - let name = crdt::Lww::migrate_from_raw(old_k.name.timestamp(), old_k.name.get().clone()); + let name = crdt::Lww::raw(old_k.name.timestamp(), old_k.name.get().clone()); Some(Key { key_id: old_k.key_id, secret_key: old_k.secret_key, diff --git a/src/model/migrate.rs b/src/model/migrate.rs index 35ff180..e4469e6 100644 --- a/src/model/migrate.rs +++ b/src/model/migrate.rs @@ -1,5 +1,7 @@ use std::sync::Arc; +use serde_bytes::ByteBuf; + use garage_table::util::EmptyKey; use garage_util::crdt::*; use garage_util::data::*; @@ -38,6 +40,16 @@ impl Migrate { old_bucket: &old_bucket::Bucket, old_bucket_p: &old_bucket::BucketParams, ) -> Result<(), Error> { + let bucket_id = blake2sum(old_bucket.name.as_bytes()); + + let new_name = if is_valid_bucket_name(&old_bucket.name) { + old_bucket.name.clone() + } else { + // if old bucket name was not valid, replace it by + // a hex-encoded name derived from its identifier + hex::encode(&bucket_id.as_slice()[..16]) + }; + let mut new_ak = Map::new(); for (k, ts, perm) in old_bucket_p.authorized_keys.items().iter() { new_ak.put( @@ -52,27 +64,27 @@ impl Migrate { } let mut aliases = LwwMap::new(); - aliases.update_in_place(old_bucket.name.clone(), true); + aliases.update_in_place(new_name.clone(), true); + + let website = if *old_bucket_p.website.get() { + Some(ByteBuf::from(DEFAULT_WEBSITE_CONFIGURATION.to_vec())) + } else { + None + }; let new_bucket = Bucket { - id: blake2sum(old_bucket.name.as_bytes()), + id: bucket_id, state: Deletable::Present(BucketParams { creation_date: now_msec(), authorized_keys: new_ak.clone(), - website_access: Lww::new(*old_bucket_p.website.get()), - website_config: Lww::new(None), + website_config: Lww::new(website), aliases, local_aliases: LwwMap::new(), }), }; self.garage.bucket_table.insert(&new_bucket).await?; - let new_alias = BucketAlias { - name: old_bucket.name.clone(), - state: Lww::new(Deletable::Present(AliasParams { - bucket_id: new_bucket.id, - })), - }; + let new_alias = BucketAlias::new(new_name.clone(), new_bucket.id).unwrap(); self.garage.bucket_alias_table.insert(&new_alias).await?; for (k, perm) in new_ak.items().iter() { diff --git a/src/model/permission.rs b/src/model/permission.rs index 04bb2bc..ebb24a3 100644 --- a/src/model/permission.rs +++ b/src/model/permission.rs @@ -34,6 +34,9 @@ impl Crdt for BucketKeyPerm { if !other.allow_write { self.allow_write = false; } + if !other.allow_owner { + self.allow_owner = false; + } } _ => (), } diff --git a/src/util/crdt/lww.rs b/src/util/crdt/lww.rs index bc686e0..99bd8e7 100644 --- a/src/util/crdt/lww.rs +++ b/src/util/crdt/lww.rs @@ -61,7 +61,7 @@ where /// /// Compared to new, the CRDT's timestamp is not set to now /// but must be set to the previous, non-compatible, CRDT's timestamp. - pub fn migrate_from_raw(ts: u64, value: T) -> Self { + pub fn raw(ts: u64, value: T) -> Self { Self { ts, v: value } } @@ -77,6 +77,11 @@ where self.v = new_value; } + /// Get the timestamp currently associated with the value + pub fn timestamp(&self) -> u64 { + self.ts + } + /// Get the CRDT value pub fn get(&self) -> &T { &self.v diff --git a/src/util/crdt/lww_map.rs b/src/util/crdt/lww_map.rs index 21cb6e1..f3a9059 100644 --- a/src/util/crdt/lww_map.rs +++ b/src/util/crdt/lww_map.rs @@ -37,11 +37,12 @@ where pub fn new() -> Self { Self { vals: vec![] } } + /// Used to migrate from a map defined in an incompatible format. This produces /// a map that contains a single item with the specified timestamp (copied from /// the incompatible format). Do this as many times as you have items to migrate, /// and put them all together using the CRDT merge operator. - pub fn migrate_from_raw_item(k: K, ts: u64, v: V) -> Self { + pub fn raw_item(k: K, ts: u64, v: V) -> Self { Self { vals: vec![(k, ts, v)], } @@ -74,9 +75,37 @@ where Self { vals: new_vals } } + /// Updates a value in place in the map (this generates + /// a new timestamp) pub fn update_in_place(&mut self, k: K, new_v: V) { self.merge(&self.update_mutator(k, new_v)); } + + /// Updates a value in place in the map, from a + /// (key, timestamp, value) triple, only if the given + /// timestamp is larger than the timestamp currently + /// in the map + pub fn merge_raw(&mut self, k: &K, ts2: u64, v2: &V) { + match self.vals.binary_search_by(|(k2, _, _)| k2.cmp(k)) { + Ok(i) => { + let (_, ts1, _v1) = &self.vals[i]; + match ts2.cmp(ts1) { + Ordering::Greater => { + self.vals[i].1 = ts2; + self.vals[i].2 = v2.clone(); + } + Ordering::Equal => { + self.vals[i].2.merge(v2); + } + Ordering::Less => (), + } + } + Err(i) => { + self.vals.insert(i, (k.clone(), ts2, v2.clone())); + } + } + } + /// Takes all of the values of the map and returns them. The current map is reset to the /// empty map. This is very usefull to produce in-place a new map that contains only a delta /// that modifies a certain value: @@ -103,10 +132,12 @@ where let vals = std::mem::take(&mut self.vals); Self { vals } } + /// Removes all values from the map pub fn clear(&mut self) { self.vals.clear(); } + /// Get a reference to the value assigned to a key pub fn get(&self, k: &K) -> Option<&V> { match self.vals.binary_search_by(|(k2, _, _)| k2.cmp(k)) { @@ -114,6 +145,16 @@ where Err(_) => None, } } + + /// Get the timestamp of the value assigned to a key, or 0 if + /// no value is assigned + pub fn get_timestamp(&self, k: &K) -> u64 { + match self.vals.binary_search_by(|(k2, _, _)| k2.cmp(k)) { + Ok(i) => self.vals[i].1, + Err(_) => 0, + } + } + /// Gets a reference to all of the items, as a slice. Usefull to iterate on all map values. /// In most case you will want to ignore the timestamp (second item of the tuple). pub fn items(&self) -> &[(K, u64, V)] { @@ -138,24 +179,7 @@ where { fn merge(&mut self, other: &Self) { for (k, ts2, v2) in other.vals.iter() { - match self.vals.binary_search_by(|(k2, _, _)| k2.cmp(k)) { - Ok(i) => { - let (_, ts1, _v1) = &self.vals[i]; - match ts2.cmp(ts1) { - Ordering::Greater => { - self.vals[i].1 = *ts2; - self.vals[i].2 = v2.clone(); - } - Ordering::Equal => { - self.vals[i].2.merge(v2); - } - Ordering::Less => (), - } - } - Err(i) => { - self.vals.insert(i, (k.clone(), *ts2, v2.clone())); - } - } + self.merge_raw(k, *ts2, v2); } } } diff --git a/src/util/time.rs b/src/util/time.rs index d919244..257b4d2 100644 --- a/src/util/time.rs +++ b/src/util/time.rs @@ -15,6 +15,11 @@ pub fn increment_logical_clock(prev: u64) -> u64 { std::cmp::max(prev + 1, now_msec()) } +/// Increment two logical clocks +pub fn increment_logical_clock_2(prev: u64, prev2: u64) -> u64 { + std::cmp::max(prev2 + 1, std::cmp::max(prev + 1, now_msec())) +} + /// Convert a timestamp represented as milliseconds since UNIX Epoch to /// its RFC3339 representation, such as "2021-01-01T12:30:00Z" pub fn msec_to_rfc3339(msecs: u64) -> String { diff --git a/src/web/web_server.rs b/src/web/web_server.rs index 6152f28..cc6eed5 100644 --- a/src/web/web_server.rs +++ b/src/web/web_server.rs @@ -99,7 +99,7 @@ async fn serve_file(garage: Arc, req: Request) -> Result