diff --git a/Cargo.lock b/Cargo.lock
index f85838e8..f5e24c2e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -8,6 +8,16 @@ dependencies = [
  "memchr 2.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "arrayref"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "arrayvec"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "atty"
 version = "0.2.14"
@@ -18,6 +28,11 @@ dependencies = [
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "autocfg"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "autocfg"
 version = "1.0.0"
@@ -40,11 +55,26 @@ dependencies = [
  "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "base64"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "bitflags"
 version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "blake2b_simd"
+version = "0.5.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayref 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "arrayvec 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "constant_time_eq 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "byteorder"
 version = "1.3.4"
@@ -73,6 +103,19 @@ name = "cfg-if"
 version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "cloudabi"
+version = "0.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "constant_time_eq"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "cookie"
 version = "0.11.2"
@@ -84,6 +127,37 @@ dependencies = [
  "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "crc32fast"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memoffset 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "devise"
 version = "0.2.0"
@@ -113,6 +187,26 @@ dependencies = [
  "syn 0.15.44 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "directories"
+version = "2.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "dirs-sys 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "dirs-sys"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_users 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "dtoa"
 version = "0.4.5"
@@ -135,6 +229,23 @@ name = "fnv"
 version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "fs2"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "fxhash"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.1.14"
@@ -258,6 +369,14 @@ name = "libc"
 version = "0.2.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "lock_api"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "scopeguard 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "log"
 version = "0.3.9"
@@ -283,11 +402,14 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "matrixserver"
 version = "0.1.0"
 dependencies = [
+ "directories 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "pretty_env_logger 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocket 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "ruma-client-api 0.6.0 (git+https://github.com/ruma/ruma-client-api)",
+ "ruma-identifiers 0.14.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sled 0.31.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -300,6 +422,14 @@ name = "memchr"
 version = "2.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "memoffset"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "mime"
 version = "0.2.6"
@@ -317,6 +447,28 @@ dependencies = [
  "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "parking_lot"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lock_api 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot_core 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "parking_lot_core"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "pear"
 version = "0.1.2"
@@ -440,6 +592,16 @@ name = "redox_syscall"
 version = "0.1.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "redox_users"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "getrandom 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rust-argon2 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "regex"
 version = "1.3.4"
@@ -590,6 +752,25 @@ dependencies = [
  "url 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rust-argon2"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "base64 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "blake2b_simd 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "constant_time_eq 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rustc_version"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "ryu"
 version = "1.0.2"
@@ -600,6 +781,24 @@ name = "safemem"
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "scopeguard"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "semver"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "semver-parser"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "serde"
 version = "1.0.104"
@@ -639,6 +838,21 @@ dependencies = [
  "url 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "sled"
+version = "0.31.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crc32fast 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-epoch 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fs2 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "smallvec"
 version = "0.6.13"
@@ -859,23 +1073,37 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
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 "checksum fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "2fad85553e09a6f881f739c29f0b00b0f01357c743266d478b68951ce23285f3"
+"checksum fs2 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "9564fc758e15025b46aa6643b1b77d047d1a56a1aea6e01002ac0c7026876213"
+"checksum fxhash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c31b6d751ae2c7f11320402d34e41349dd1016f8d5d45e48c4312bc8625af50c"
 "checksum getrandom 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)" = "7abc8dd8451921606d809ba32e95b6111925cd2906060d2dcc29c070220503eb"
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@@ -891,13 +1119,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum language-tags 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a91d884b6667cd606bb5a69aa0c99ba811a115fc68915e7056ec08a46e93199a"
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+"checksum memoffset 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "75189eb85871ea5c2e2c15abbdd541185f63b408415e5051f5cac122d8c774b9"
 "checksum mime 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "ba626b8a6de5da682e1caa06bdb42a335aee5a84db8e5046a3e8ab17ba0a3ae0"
 "checksum num_cpus 1.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "46203554f085ff89c235cd12f7075f3233af9b11ed7c9e16dfe2560d03313ce6"
+"checksum parking_lot 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "92e98c49ab0b7ce5b222f2cc9193fc4efe11c6d0bd4f648e374684a6857b1cfc"
+"checksum parking_lot_core 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7582838484df45743c8434fbff785e8edf260c28748353d44bc0da32e0ceabf1"
 "checksum pear 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c26d2b92e47063ffce70d3e3b1bd097af121a9e0db07ca38a6cc1cf0cc85ff25"
 "checksum pear_codegen 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "336db4a192cc7f54efeb0c4e11a9245394824cc3bcbd37ba3ff51240c35d7a6e"
 "checksum percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "31010dd2e1ac33d5b46a5b413495239882813e0369f8ed8a5e266f173602f831"
@@ -914,6 +1146,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
 "checksum rand_hc 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
 "checksum redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)" = "2439c63f3f6139d1b57529d16bc3b8bb855230c8efcc5d3a896c8bea7c3b1e84"
+"checksum redox_users 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "09b23093265f8d200fa7b4c2c76297f47e681c655f6f1285a8780d6a022f7431"
 "checksum regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "322cf97724bea3ee221b78fe25ac9c46114ebb51747ad5babd51a2fc6a8235a8"
 "checksum regex-syntax 0.6.14 (registry+https://github.com/rust-lang/crates.io-index)" = "b28dfe3fe9badec5dbf0a79a9cccad2cfc2ab5484bdb3e44cbd1ae8b3ba2be06"
 "checksum ring 0.13.5 (registry+https://github.com/rust-lang/crates.io-index)" = "2c4db68a2e35f3497146b7e4563df7d4773a2433230c5e4b448328e31740458a"
@@ -926,12 +1159,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum ruma-events 0.15.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4a196cbeaa7bffe3756448ee9cf142645790e2a0ece78dfaf10a311eaf5e2a5e"
 "checksum ruma-events-macros 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "962d93056619ed61826a9d8872c863560e4892ff6a69b70f593baa5ae8b19dc8"
 "checksum ruma-identifiers 0.14.1 (registry+https://github.com/rust-lang/crates.io-index)" = "07e442c700a3b33fc4dd4a1c4b463ebdd252d2c2db31b83da6bb3009307039b9"
+"checksum rust-argon2 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2bc8af4bda8e1ff4932523b94d3dd20ee30a87232323eda55903ffd71d2fb017"
+"checksum rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
 "checksum ryu 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "bfa8506c1de11c9c4e4c38863ccbe02a305c8188e85a05a784c9e11e1c3910c8"
 "checksum safemem 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ef703b7cb59335eae2eb93ceb664c0eb7ea6bf567079d843e09420219668e072"
+"checksum scopeguard 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
+"checksum semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
+"checksum semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
 "checksum serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)" = "414115f25f818d7dfccec8ee535d76949ae78584fc4f79a6f45a904bf8ab4449"
 "checksum serde_derive 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)" = "128f9e303a5a29922045a830221b8f78ec74a5f544944f3d5984f8ec3895ef64"
 "checksum serde_json 1.0.48 (registry+https://github.com/rust-lang/crates.io-index)" = "9371ade75d4c2d6cb154141b9752cf3781ec9c05e0e5cf35060e1e70ee7b9c25"
 "checksum serde_urlencoded 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9ec5d77e2d4c73717816afac02670d5c4f534ea95ed430442cad02e7a6e32c97"
+"checksum sled 0.31.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8fb6824dde66ad33bf20c6e8476f5b82b871bc8bc3c129a10ea2f7dae5060fa3"
 "checksum smallvec 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)" = "f7b0758c52e15a8b5e3691eae6cc559f08eee9406e548a4477ba4e67770a82b6"
 "checksum smallvec 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5c2fb2ec9bcd216a5b0d0ccf31ab17b5ed1d627960edff65bbe95d3ce221cefc"
 "checksum state 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7345c971d1ef21ffdbd103a75990a15eb03604fc8b8852ca8cb418ee1a099028"
diff --git a/Cargo.toml b/Cargo.toml
index 6b4918b6..7c9a7164 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,3 +12,6 @@ http = "0.2.0"
 ruma-client-api = { git = "https://github.com/ruma/ruma-client-api" }
 pretty_env_logger = "0.4.0"
 log = "0.4.8"
+sled = "0.31.0"
+directories = "2.0.2"
+ruma-identifiers = "0.14.1"
diff --git a/src/main.rs b/src/main.rs
index 5fa7ff1c..bb636464 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,16 +2,19 @@
 mod ruma_wrapper;
 
 use {
-    rocket::{get, post, put, routes},
+    directories::ProjectDirs,
+    rocket::{get, post, put, routes, State},
     ruma_client_api::{
         error::{Error, ErrorKind},
         r0::{
             account::register, alias::get_alias, membership::join_room_by_id,
-            message::create_message_event,
+            message::create_message_event, session::login,
         },
         unversioned::get_supported_versions,
     },
+    ruma_identifiers::UserId,
     ruma_wrapper::{MatrixResult, Ruma},
+    sled::Db,
     std::convert::TryInto,
 };
 
@@ -23,8 +26,13 @@ fn get_supported_versions_route() -> MatrixResult<get_supported_versions::Respon
 }
 
 #[post("/_matrix/client/r0/register", data = "<body>")]
-fn register_route(body: Ruma<register::Request>) -> MatrixResult<register::Response> {
-    let user_id = match (*format!(
+fn register_route(
+    db: State<Db>,
+    body: Ruma<register::Request>,
+) -> MatrixResult<register::Response> {
+    let users = db.open_tree("users").unwrap();
+
+    let user_id: UserId = match (*format!(
         "@{}:localhost",
         body.username.clone().unwrap_or("randomname".to_owned())
     ))
@@ -33,13 +41,28 @@ fn register_route(body: Ruma<register::Request>) -> MatrixResult<register::Respo
         Err(_) => {
             return MatrixResult(Err(Error {
                 kind: ErrorKind::InvalidUsername,
-                message: "Username was invalid. ".to_owned(),
+                message: "Username was invalid.".to_owned(),
                 status_code: http::StatusCode::BAD_REQUEST,
             }))
         }
         Ok(user_id) => user_id,
     };
 
+    if users.contains_key(user_id.to_string()).unwrap() {
+        return MatrixResult(Err(Error {
+            kind: ErrorKind::UserInUse,
+            message: "Desired user ID is already taken.".to_owned(),
+            status_code: http::StatusCode::BAD_REQUEST,
+        }));
+    }
+
+    users
+        .insert(
+            user_id.to_string(),
+            &*body.password.clone().unwrap_or_default(),
+        )
+        .unwrap();
+
     MatrixResult(Ok(register::Response {
         access_token: "randomtoken".to_owned(),
         home_server: "localhost".to_owned(),
@@ -48,6 +71,38 @@ fn register_route(body: Ruma<register::Request>) -> MatrixResult<register::Respo
     }))
 }
 
+#[post("/_matrix/client/r0/login", data = "<body>")]
+fn login_route(db: State<Db>, body: Ruma<login::Request>) -> MatrixResult<login::Response> {
+    let user_id = if let login::UserInfo::MatrixId(username) = &body.user {
+        let user_id = format!("@{}:localhost", username);
+        let users = db.open_tree("users").unwrap();
+        if !users.contains_key(user_id.clone()).unwrap() {
+            dbg!();
+            return MatrixResult(Err(Error {
+                kind: ErrorKind::Forbidden,
+                message: "UserId not found.".to_owned(),
+                status_code: http::StatusCode::BAD_REQUEST,
+            }));
+        }
+        user_id
+    } else {
+        dbg!();
+        return MatrixResult(Err(Error {
+            kind: ErrorKind::Unknown,
+            message: "Bad login type.".to_owned(),
+            status_code: http::StatusCode::BAD_REQUEST,
+        }));
+    };
+
+    return MatrixResult(Ok(login::Response {
+        user_id: (*user_id).try_into().unwrap(), // User id is correct because the user is already registered
+        access_token: "randomtoken".to_owned(),
+        home_server: Some("localhost".to_owned()),
+        device_id: body.device_id.clone().unwrap_or("randomid".to_owned()),
+        well_known: None,
+    }));
+}
+
 #[get("/_matrix/client/r0/directory/room/<room_alias>")]
 fn get_alias_route(room_alias: String) -> MatrixResult<get_alias::Response> {
     let room_id = match &*room_alias {
@@ -97,16 +152,25 @@ fn create_message_event_route(
 
 fn main() {
     pretty_env_logger::init();
+    let db = sled::open(
+        ProjectDirs::from("xyz", "koesters", "matrixserver")
+            .unwrap()
+            .data_dir(),
+    )
+    .unwrap();
+
     rocket::ignite()
         .mount(
             "/",
             routes![
                 get_supported_versions_route,
                 register_route,
+                login_route,
                 get_alias_route,
                 join_room_by_id_route,
                 create_message_event_route,
             ],
         )
+        .manage(db)
         .launch();
 }