Removed mysql dependency and fetch all configuration from configuration file.

16 files changed, 362 insertions, 280 deletions

diff --git a/.gitignore b/.gitignore
index b639341..e6ad768 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,3 @@
-bastion
 build
-id_rsa
-ssh_host_*_key
-test_client.c
+stuff
 *.sw[a-p]
diff --git a/README.md b/README.md
index 9f564e8..5b9caa9 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,6 @@ This project has only two hard dependencies :
 The following are optional dependencies :
 - the libtty from https://github.com/kilobyte/termrec which allows session recording.
 - compression libraries like libbz2, liblzma, libz allow on the fly compression of session records.
-- libmysql for now because it hosts the runtime config
 
 ## Manual Installation
 
diff --git a/bastion/CMakeLists.txt b/bastion/CMakeLists.txt
index 298cfe7..9fd4212 100644
--- a/bastion/CMakeLists.txt
+++ b/bastion/CMakeLists.txt
@@ -7,7 +7,7 @@ target_link_libraries(bastion common)
 if (${SESSION_RECORDING})
     target_link_libraries(bastion libtty)
 endif()
-target_link_libraries(bastion bz2 config lzma mysqlclient ssh z)
+target_link_libraries(bastion bz2 config lzma ssh z)
 
 install(TARGETS bastion DESTINATION bin)
 
diff --git a/bastion/bastion.conf.example.in b/bastion/bastion.conf.example.in
new file mode 100644
index 0000000..34ac9b4
--- /dev/null
+++ b/bastion/bastion.conf.example.in
@@ -0,0 +1,25 @@
+port = 2222;
+
+keys:
+{
+    dsa = "@CMAKE_INSTALL_PREFIX@/etc/bastion/ssh_host_dsa_key";
+    rsa = "@CMAKE_INSTALL_PREFIX@/etc/bastion/ssh_host_rsa_key";
+    ecdsa = "@CMAKE_INSTALL_PREFIX@/etc/bastion/ssh_host_ecdsa_key";
+};
+
+session_recording:
+{
+    path = "@CMAKE_INSTALL_PREFIX@/var/log/bastion/$d/$h/$u/$i.gz";     # $d : date in iso format, $h : hostname, $u : username : $i session id
+};
+
+hostkeys = (
+    { name = "default", path = "id_rsa_default" }
+);
+
+users = (
+    { name = "julien", public_key = "ssh-rsa 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" }
+);
+
+hosts = (
+    { name = "myth", address = "myth", user = "root", hostkey = "default", public_key = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPNmO4zkfz1RvWdKGRX8AEP4FrwDkW4EnBoU/GNm6Ooe" }
+);
diff --git a/bastion/client.c b/bastion/client.c
index fc11bb6..543603f 100644
--- a/bastion/client.c
+++ b/bastion/client.c
@@ -3,7 +3,7 @@
 #include <stdlib.h>
 
 #include "common/config.h"
-#include "common/mysql.h"
+#include "common/data.h"
 #include "client.h"
 #ifdef SESSION_RECORDING
 #include "recording.h"
@@ -88,16 +88,10 @@ struct client_channel_data_struct* client_dial(ssh_event event, struct proxy_cha
     cdata->client_channel_cb = NULL;
 
     /* First we try to add the private key that the server will accept */
-    struct db_host_info * info = db_get_host_info(hostname);
+    struct data_host_info * info = data_get_host_info(hostname);
     if (info == NULL)
         goto host_info_clean;
 
-    ssh_key privkey = NULL;
-    if (ssh_pki_import_privkey_base64(info->privkeytxt, NULL, NULL, NULL, &privkey) != SSH_OK) {
-        printf("Error importing private key");
-        goto privkey_clean;
-    }
-
     /* We try to connect to the remote server */
     printf("Connecting to %s\n", hostname);
     cdata->my_session = ssh_new();
@@ -116,34 +110,26 @@ struct client_channel_data_struct* client_dial(ssh_event event, struct proxy_cha
 
     /* We now validate the remote server's public key */
     ssh_key server_pub_key = NULL;
-    unsigned char * hash = NULL;
-    size_t hlen;
-    char * hexa = NULL;
     if (ssh_get_server_publickey(cdata->my_session, &server_pub_key) != SSH_OK) {
         fprintf(stderr, "Error getting server publickey: %s\n", ssh_get_error(cdata->my_session));
         goto pubkey_clean;
     }
-    if (ssh_get_publickey_hash(server_pub_key, SSH_PUBLICKEY_HASH_SHA1, &hash, &hlen) != SSH_OK) {
-        fprintf(stderr, "Error getting publickey hash: %s\n", ssh_get_error(cdata->my_session));
-        goto pubkey_hash_clean;
+    char *pubkeystr = NULL;
+    if (ssh_pki_export_pubkey_base64(server_pub_key, &pubkeystr) != SSH_OK) {
+        fprintf(stderr, "Got invalid public key from server attempt, this shouldn't happen.\n");
+        goto pubkey_clean;
     }
-    hexa = ssh_get_hexa(hash, hlen);
-    if (strlen(info->hostkeyhash) > 0) {
-        if (strcmp(hexa, info->hostkeyhash) != 0) {
-            fprintf(stderr, "Error invalid host key for %s\n", hostname);
-            goto pubkey_hexa_clean;
-        }
-    } else {
-        // TODO we got a broken sshportal record, we need to fix it but only
-        // after we completed the migration from sshportal
-        //db_set_host_publickey_hash(hostname, hexa);
+    if (strcmp(info->pubkey, pubkeystr) != 0) {
+        fprintf(stderr, "Error : public key of server %s doesn't match.\n", hostname);
+        fprintf(stderr, "got : %s\n", pubkeystr);
+        fprintf(stderr, "exp : %s\n", info->pubkey);
+        goto pubkey_clean;
     }
-    ssh_string_free_char(hexa);
-    ssh_clean_pubkey_hash(&hash);
+    free(pubkeystr);
     ssh_key_free(server_pub_key);
 
     /* With the server checked, we can authenticate */
-    if(ssh_userauth_publickey(cdata->my_session, NULL, privkey) == SSH_AUTH_SUCCESS){
+    if(ssh_userauth_publickey(cdata->my_session, NULL, info->key) == SSH_AUTH_SUCCESS){
         printf("Authentication success\n");
     } else {
         printf("Error private key was rejected\n");
@@ -186,25 +172,19 @@ struct client_channel_data_struct* client_dial(ssh_event event, struct proxy_cha
     }
 #endif
 
-    ssh_key_free(privkey);
-    db_free_host_info(info);
+    free(info);
     return cdata;
 
 channel_clean:
     ssh_channel_free(cdata->my_channel);
     goto session_clean;
-pubkey_hexa_clean:
-    ssh_string_free_char(hexa);
-pubkey_hash_clean:
-    ssh_clean_pubkey_hash(&hash);
 pubkey_clean:
+    free(pubkeystr);
     ssh_key_free(server_pub_key);
 session_clean:
     ssh_disconnect(cdata->my_session);
     ssh_free(cdata->my_session);
-    db_free_host_info(info);
-privkey_clean:
-    ssh_key_free(privkey);
+    free(info);
 host_info_clean:
     free(cdata);
     return NULL;
diff --git a/bastion/main.c b/bastion/main.c
index 4f93652..d4fb321 100644
--- a/bastion/main.c
+++ b/bastion/main.c
@@ -5,7 +5,6 @@
 #include <sys/wait.h>
 
 #include "common/config.h"
-#include "common/mysql.h"
 #include "session.h"
 #include "state.h"
 
@@ -28,7 +27,6 @@ __attribute__((noreturn)) static void sigint_handler(int signo)
     state_clean();
     config_clean();
     ssh_finalize();
-    db_clean();
     exit(0);
 }
 
@@ -145,6 +143,5 @@ int main()
     ssh_bind_free(sshbind);
     config_clean();
     ssh_finalize();
-    db_clean();
     return 0;
 }
diff --git a/bastion/proxy.c b/bastion/proxy.c
index f608d31..0cf3675 100644
--- a/bastion/proxy.c
+++ b/bastion/proxy.c
@@ -2,7 +2,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-#include "common/mysql.h"
 #include "client.h"
 #include "proxy.h"
 #include "state.h"
@@ -202,8 +201,8 @@ void handle_proxy_session(ssh_event event, ssh_session session, ssh_channel my_c
     ssh_callbacks_init(&channel_cb);
     ssh_set_channel_callbacks(my_channel, &channel_cb);
 
-    db_clean(); // we close the mysql connection before the main loop, as to not waste ressources
-
+    // TODO gather what is required from data and config so that we can free
+    // those and not waste resources
     do {
         /* Poll the main event which takes care of the sessions and channels */
         if (ssh_event_dopoll(event, -1) == SSH_ERROR) {
diff --git a/bastion/session.c b/bastion/session.c
index f86fe44..4c38389 100644
--- a/bastion/session.c
+++ b/bastion/session.c
@@ -9,7 +9,7 @@
 #include <sys/wait.h>
 
 #include "common/config.h"
-#include "common/mysql.h"
+#include "common/data.h"
 #include "proxy.h"
 #include "session.h"
 #include "state.h"
@@ -31,19 +31,19 @@ static int auth_pubkey(ssh_session session, const char *user, ssh_key pubkey, ch
 
     // TODO check for an invite
 
-    char * bastion_username = db_get_username_from_pubkey(pubkey);
+    const char * bastion_username = data_get_username_from_pubkey(pubkey);
     if (bastion_username != NULL) {
         sdata->authenticated = 1;
         if (state_set_ssh_destination(user) != 0)
             return SSH_ERROR;
         // TODO check access rights and host configs
         state_set_bastion_username(bastion_username);
-        unsigned long long session_id = db_init_session_and_get_id(user, bastion_username);
-        state_set_session_id(session_id);
-        free(bastion_username);
+        //TODO Find out how to keep session id in a spool or something - probably with the state.c and state.h stuff
+        //unsigned long long session_id = data_init_session_and_get_id(user, bastion_username);
+        //state_set_session_id(session_id);
+        state_set_session_id(0);
         return SSH_AUTH_SUCCESS;
     } else {
-        free(bastion_username);
         sdata->auth_attempts++;
         return SSH_AUTH_DENIED;
     }
diff --git a/bastion/state.c b/bastion/state.c
index 6784c0a..347e7ba 100644
--- a/bastion/state.c
+++ b/bastion/state.c
@@ -8,7 +8,7 @@
 struct state {
     unsigned long long session_id;
     char * destination;
-    char * bastion_username;
+    const char * bastion_username;
 };
 
 static struct state state = {0};
@@ -26,7 +26,7 @@ state_set_ssh_destination(const char * name)
         return 2;
     }
     state.destination = malloc(len+1);
-    strncpy(state.destination, name, len+1);
+    strcpy(state.destination, name);
     return 0;
 }
 
@@ -42,13 +42,7 @@ state_set_bastion_username(const char * name)
         fprintf(stderr, "BUG found, attempting to overwrite state.bastion_username that has already been set\n");
         return 1;
     }
-    size_t len = strnlen(name, MAX_USERNAME_LENGTH + 1);
-    if (len >= MAX_USERNAME_LENGTH + 1) {
-        fprintf(stderr, "Username too long, max length is %d.\n", MAX_USERNAME_LENGTH);
-        return 1;
-    }
-    state.bastion_username = malloc(len+1);
-    strncpy(state.bastion_username, name, len+1);
+    state.bastion_username = name;
     return 0;
 }
 
diff --git a/common/config.c b/common/config.c
index e8196ce..1c45e7e 100644
--- a/common/config.c
+++ b/common/config.c
@@ -2,6 +2,7 @@
 #include <stdlib.h>
 
 #include "config.h"
+#include "data_for_config.h"
 
 config_t * config = NULL;
 
@@ -26,7 +27,7 @@ config_load(void)
         fprintf(stderr, "Configuration read error occured at %s:%d %s\n", config_error_file(config), config_error_line(config), config_error_text(config));
         return 1;
     }
-    return 0;
+    return data_init(config);
 }
 
 int config_get_port(void)
@@ -79,6 +80,7 @@ const char * config_get_session_recording_path(void)
 void config_clean(void)
 {
     if (config != NULL) {
+        data_clean();
         config_destroy(config);
         free(config);
         config = NULL;
diff --git a/common/config.h.in b/common/config.h.in
index a1fe21b..95d43c9 100644
--- a/common/config.h.in
+++ b/common/config.h.in
@@ -5,18 +5,12 @@
 #define CONFIG_PATH CONFIG_DIR "bastion.conf"
 
 #define MAX_HOSTNAME_LENGTH 64
-#define MAX_USERNAME_LENGTH 64
 
 #define DEFAULT_PORT 2222
 #define DEFAULT_DSAKEY_PATH "@CMAKE_INSTALL_PREFIX@/etc/bastion/ssh_host_dsa_key"
 #define DEFAULT_RSAKEY_PATH "@CMAKE_INSTALL_PREFIX@/etc/bastion/ssh_host_rsa_key"
 #define DEFAULT_ECDSAKEY_PATH "@CMAKE_INSTALL_PREFIX@/etc/bastion/ssh_host_ecdsa_key"
 
-#define MYSQL_HOST "localhost"
-#define MYSQL_USER "sshportal"
-#define MYSQL_PASS "graou"
-#define MYSQL_DB "sshportal"
-
 #ifdef SESSION_RECORDING
 #define DEFAULT_SESSION_RECORDING_PATH "@CMAKE_INSTALL_PREFIX@/var/log/bastion/$d/$h/$u/$i.gz"
 #define SESSION_RECORDING_FILENAME_MAX_LEN 255
diff --git a/common/data.c b/common/data.c
new file mode 100644
index 0000000..ab9710f
--- /dev/null
+++ b/common/data.c
@@ -0,0 +1,276 @@
+#include <ctype.h>
+#include <libconfig.h>
+#include <libssh/libssh.h>
+#include <uthash.h>
+
+#include "config.h"
+#include "data_for_config.h"
+
+struct key {
+    const char *name;          // key
+    ssh_key key;
+    UT_hash_handle hh;         // makes this structure hashable
+};
+
+struct user {
+    const char *name;          // key for hh_user
+    const char *pubkeystr;        // key for hh_pubkey
+    UT_hash_handle hh_user, hh_pubkey;         // makes this structure hashable, twice
+};
+
+struct host {
+    const char *name;
+    const char *address;
+    const char *user;
+    ssh_key key;
+    const char *pubkeystr;
+    UT_hash_handle hh;         // makes this structure hashable
+};
+
+struct key * keys = NULL;
+struct user * users = NULL;
+struct user * pubkeys = NULL;
+struct host *hosts = NULL;
+
+char  // returns 0 if ok, something else otherwise
+data_init(const config_t * config)
+{
+    config_setting_t *setting;
+    const int config_dir_len = strlen(CONFIG_DIR);
+
+    // We load the ssh keys in the hastable
+    setting = config_lookup(config, "hostkeys");
+    if(setting != NULL) {
+        int count = config_setting_length(setting);
+        for(int i = 0; i < count; ++i) {
+            config_setting_t *elt = config_setting_get_elem(setting, i);
+            const char *name, *key_path;
+            if (config_setting_lookup_string(elt, "name", &name) == CONFIG_FALSE) {
+                fprintf(stderr, "Invalid key entry with no name.\n");
+                return 1;
+            }
+            struct key * tmp;
+            HASH_FIND_STR(keys, name, tmp);
+            if (tmp != NULL) {
+                fprintf(stderr, "Invalid key with duplicate name %s.\n", name);
+                return 1;
+            }
+            if (config_setting_lookup_string(elt, "path", &key_path) == CONFIG_FALSE) {
+                fprintf(stderr, "Invalid key entry %s with no path.\n", name);
+                return 1;
+            }
+            tmp = malloc(sizeof(struct key));
+            tmp->name = name;
+            char * key_realpath = malloc(strlen(key_path) + config_dir_len + 1);
+            strcpy(key_realpath, CONFIG_DIR);
+            strcpy(key_realpath + config_dir_len, key_path);
+            switch(ssh_pki_import_privkey_file(key_realpath, NULL, NULL, NULL, &tmp->key)) {
+              case SSH_EOF:
+                fprintf(stderr, "Error importing ssh key from file %s : file doesn't exist or permission denied.\n", key_realpath);
+                free(key_realpath);
+                free(tmp);
+                return 1;
+                break;
+              case SSH_ERROR:
+                fprintf(stderr, "Error importing ssh key from file %s.\n", key_realpath);
+                free(key_realpath);
+                free(tmp);
+                return 1;
+                break;
+              case SSH_OK:
+                break;
+            }
+            HASH_ADD_KEYPTR(hh, keys, tmp->name, strlen(tmp->name), tmp);
+            free(key_realpath);
+        }
+    }
+
+    // We load the users in the hastable
+    setting = config_lookup(config, "users");
+    if(setting != NULL) {
+        int count = config_setting_length(setting);
+        for(int i = 0; i < count; ++i) {
+            config_setting_t *elt = config_setting_get_elem(setting, i);
+            const char *name, *pubkeystr;
+            if (config_setting_lookup_string(elt, "name", &name) == CONFIG_FALSE) {
+                fprintf(stderr, "Invalid user entry with no name.\n");
+                return 1;
+            }
+            unsigned int name_len = strlen(name);
+            struct user * tmp;
+            HASH_FIND(hh_user, users, name, name_len, tmp);
+            if (tmp != NULL) {
+                fprintf(stderr, "Invalid user with duplicate name %s.\n", name);
+                return 1;
+            }
+            if (config_setting_lookup_string(elt, "public_key", &pubkeystr) == CONFIG_FALSE) {
+                fprintf(stderr, "Invalid user entry %s with no public_key.\n", name);
+                return 1;
+            }
+            // TODO support other key types
+            // And find a cleaner way to strip this key header before importing, and store a type flag
+            char * rsa = "ssh-rsa ";
+            pubkeystr += strlen(rsa);
+            unsigned int pubkeystr_len = strlen(pubkeystr);
+            for (unsigned int i = 0; i < pubkeystr_len; ++i) {
+                if (isspace(pubkeystr[i]) == 0)
+                    continue;
+                fprintf(stderr, "Invalid trailing characters in public key for user %s :%s.\n", name, pubkeystr+i);
+                return 1;
+            }
+            HASH_FIND(hh_pubkey, pubkeys, pubkeystr, pubkeystr_len, tmp);
+            if (tmp != NULL) {
+                fprintf(stderr, "Invalid user %s with duplicate public_key with %s.\n", name, tmp->name);
+                return 1;
+            }
+            ssh_key tmpkey;
+            switch(ssh_pki_import_pubkey_base64(pubkeystr, SSH_KEYTYPE_RSA, &tmpkey)) {
+              case SSH_ERROR:
+                fprintf(stderr, "Error importing public key for user %s.\n", name);
+                return 1;
+                break;
+              case SSH_OK:
+                ssh_key_free(tmpkey);
+                break;
+            }
+            tmp = malloc(sizeof(struct user));
+            tmp->name = name;
+            tmp->pubkeystr = pubkeystr;
+            HASH_ADD_KEYPTR(hh_user, users, tmp->name, name_len, tmp);
+            HASH_ADD_KEYPTR(hh_pubkey, pubkeys, tmp->pubkeystr, pubkeystr_len, tmp);
+        }
+    }
+
+    // We load the hosts in the hastable
+    setting = config_lookup(config, "hosts");
+    if(setting != NULL) {
+        int count = config_setting_length(setting);
+        for(int i = 0; i < count; ++i) {
+            config_setting_t *elt = config_setting_get_elem(setting, i);
+            const char *name, *address, *user, *hostkey, *pubkeystr;
+            if (config_setting_lookup_string(elt, "name", &name) == CONFIG_FALSE) {
+                fprintf(stderr, "Invalid host entry with no name.\n");
+                return 1;
+            }
+            struct host * tmp;
+            HASH_FIND_STR(hosts, name, tmp);
+            if (tmp != NULL) {
+                fprintf(stderr, "Invalid host with duplicate name %s.\n", name);
+                return 1;
+            }
+            if (config_setting_lookup_string(elt, "address", &address) == CONFIG_FALSE) {
+                fprintf(stderr, "Invalid host entry %s with no address.\n", name);
+                return 1;
+            }
+            if (config_setting_lookup_string(elt, "user", &user) == CONFIG_FALSE) {
+                fprintf(stderr, "Invalid host entry %s with no user.\n", name);
+                return 1;
+            }
+            if (config_setting_lookup_string(elt, "hostkey", &hostkey) == CONFIG_FALSE) {
+                fprintf(stderr, "Invalid host entry %s with no ssh_key.\n", name);
+                return 1;
+            }
+            struct key * key;
+            HASH_FIND_STR(keys, hostkey, key);
+            if (key == NULL) {
+                fprintf(stderr, "Host key \"%s\" was not found for host \"%s\".\n", hostkey, name);
+                return 1;
+            }
+            if (config_setting_lookup_string(elt, "public_key", &pubkeystr) == CONFIG_FALSE) {
+                fprintf(stderr, "Invalid user entry %s with no public_key.\n", name);
+                return 1;
+            }
+            // TODO support other key types
+            // And find a cleaner way to strip this key header before importing, and store a type flag
+            char * ecdsa = "ssh-ed25519 ";
+            pubkeystr += strlen(ecdsa);
+            unsigned int pubkeystr_len = strlen(pubkeystr);
+            for (unsigned int i = 0; i < pubkeystr_len; ++i) {
+                if (isspace(pubkeystr[i]) == 0)
+                    continue;
+                fprintf(stderr, "Invalid trailing characters in public key for user %s :%s.\n", name, pubkeystr+i);
+                return 1;
+            }
+            ssh_key tmpkey;
+            switch(ssh_pki_import_pubkey_base64(pubkeystr, SSH_KEYTYPE_ED25519, &tmpkey)) {
+              case SSH_ERROR:
+                fprintf(stderr, "Error importing public key for user %s.\n", name);
+                free(tmp);
+                return 1;
+                break;
+              case SSH_OK:
+                ssh_key_free(tmpkey);
+                break;
+            }
+            tmp = malloc(sizeof(struct host));
+            tmp->name = name;
+            tmp->address = address;
+            tmp->user = user;
+            tmp->key = key->key;
+            tmp->pubkeystr = pubkeystr;
+            HASH_ADD_KEYPTR(hh, hosts, tmp->name, strlen(tmp->name), tmp);
+        }
+    }
+
+    return 0;
+}
+
+void data_clean(void)
+{
+    struct key *current_key, *tmp_key;
+
+    HASH_ITER(hh, keys, current_key, tmp_key) {
+        HASH_DEL(keys, current_key);
+        ssh_key_free(current_key->key);
+        free(current_key);
+    }
+
+    HASH_CLEAR(hh_user, users);
+
+    struct user *current_pubkey, *tmp_pubkey;
+    HASH_ITER(hh_pubkey, pubkeys, current_pubkey, tmp_pubkey) {
+        HASH_DELETE(hh_pubkey, pubkeys, current_pubkey);
+        free(current_pubkey);
+    }
+
+    struct host *current_host, *tmp_host;
+    HASH_ITER(hh, hosts, current_host, tmp_host) {
+        HASH_DEL(hosts, current_host);
+        free(current_host);
+    }
+}
+
+const char * // returns NULL if no user found
+data_get_username_from_pubkey(ssh_key pubkey)
+{
+    const char *username = NULL;
+    char *pubkeystr;
+    if (ssh_pki_export_pubkey_base64(pubkey, &pubkeystr) != SSH_OK) {
+        fprintf(stderr, "Got invalid public key from auth attempt, this shouldn't happen.\n");
+        return NULL;
+    }
+    unsigned int pubkeystr_len = strlen(pubkeystr);
+    struct user *tmp;
+    HASH_FIND(hh_pubkey, pubkeys, pubkeystr, pubkeystr_len, tmp);
+    if (tmp != NULL) {
+        username = tmp->name;
+    }
+    free(pubkeystr);
+    return username;
+}
+
+struct data_host_info * // returns NULL if no key found, this struct is to be freed from the calling code
+data_get_host_info(const char * hostname)
+{
+    struct host * tmp;
+    HASH_FIND_STR(hosts, hostname, tmp);
+    if (tmp != NULL) {
+        struct data_host_info *info = malloc(sizeof(struct data_host_info));
+        info->address = tmp->address;
+        info->username = tmp->user;
+        info->key = tmp->key;
+        info->pubkey = tmp->pubkeystr;
+        return info;
+    }
+    return NULL;
+}
diff --git a/common/data.h b/common/data.h
new file mode 100644
index 0000000..1ede88b
--- /dev/null
+++ b/common/data.h
@@ -0,0 +1,19 @@
+#ifndef COMMON_DATA_H_
+#define COMMON_DATA_H_
+
+#include <libssh/server.h>
+
+void data_clean(void);
+
+struct data_host_info {
+    const char * address;
+    const char * username;
+    ssh_key key;
+    const char * pubkey;
+};
+
+const char * data_get_username_from_pubkey(ssh_key pubkey);
+struct data_host_info * // returns NULL if no key found, this struct is to be freed from the calling code
+data_get_host_info(const char * hostname);
+
+#endif
diff --git a/common/data_for_config.h b/common/data_for_config.h
new file mode 100644
index 0000000..acf0cac
--- /dev/null
+++ b/common/data_for_config.h
@@ -0,0 +1,10 @@
+#ifndef COMMON_DATA_FOR_CONFIG_H_
+#define COMMON_DATA_FOR_CONFIG_H_
+
+#include <libconfig.h>
+#include "data.h"
+
+char  // returns 0 if ok, something else otherwise
+data_init(const config_t * config);
+
+#endif
diff --git a/common/mysql.c b/common/mysql.c
deleted file mode 100644
index 83a7930..0000000
--- a/common/mysql.c
+++ /dev/null
@@ -1,188 +0,0 @@
-#include <libssh/server.h>
-#include <mysql/mysql.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-
-#include "config.h"
-#include "mysql.h"
-
-static MYSQL *db;
-
-char // returns 0 if ok, greater than 0 otherwise
-db_init(void)
-{
-    printf("MySQL client version: %s\n", mysql_get_client_info());
-    db = mysql_init(NULL);
-    if (db == NULL) {
-        fprintf(stderr, "%s\n", mysql_error(db));
-        return 1;
-    }
-    if (mysql_real_connect(db, MYSQL_HOST, MYSQL_USER, MYSQL_PASS, MYSQL_DB, 0, NULL, 0) == NULL) {
-        fprintf(stderr, "%s\n", mysql_error(db));
-        mysql_close(db);
-        return 1;
-    }
-    return 0;
-}
-
-void db_clean(void)
-{
-    mysql_close(db);
-    db = NULL;
-}
-
-char * // returns NULL if no user found, this char * is to be freed from the calling code
-db_get_username_from_pubkey(ssh_key pubkey)
-{
-    int res = mysql_query(db, "SELECT name, authorized_key FROM users, user_keys WHERE users.id = user_keys.user_id");
-    if (res != 0) {
-        fprintf(stderr, "WARNING: Couldn't get usernames from database.\n");
-        return NULL;
-    }
-    MYSQL_RES *result = mysql_store_result(db);
-    if (result == NULL) {
-        fprintf(stderr, "FATAL: Couldn't retrieve public keys from database.\n");
-        return NULL;
-    }
-
-    MYSQL_ROW row;
-    while ((row = mysql_fetch_row(result))) {
-        char * rsa = "ssh-rsa ";
-        if (strncmp (row[1], rsa, strlen(rsa)) != 0) {
-            fprintf(stderr, "Unsupported public key type for user %s : %s\n", row[0], row[1]);
-        } else {
-            ssh_key tmp_key;
-            if (ssh_pki_import_pubkey_base64(row[1] + strlen(rsa), SSH_KEYTYPE_RSA, &tmp_key) != SSH_OK) {
-                fprintf(stderr, "Error importing public key for user %s : %s\n", row[0], row[1]);
-            } else if (!ssh_key_cmp(pubkey, tmp_key, SSH_KEY_CMP_PUBLIC)) {
-                size_t len = strlen(row[0]);
-                char * username = malloc(len+1);
-                strcpy(username, row[0]);
-                ssh_key_free(tmp_key);
-                mysql_free_result(result);
-                return username;
-            } else {
-                ssh_key_free(tmp_key);
-            }
-        }
-    }
-
-    fprintf(stderr, "ERROR: Didn't find public key in database.\n");
-    mysql_free_result(result);
-    return NULL;
-}
-
-struct db_host_info * // returns NULL if no key found, this char * is to be freed from the calling code
-db_get_host_info(const char * hostname)
-{
-    char buff[255];
-    sprintf(buff, "SELECT priv_key, url, host_key FROM ssh_keys, hosts WHERE ssh_keys.id = hosts.ssh_key_id and hosts.name = \"%s\"", hostname);
-    int res = mysql_query(db, buff);
-    if (res != 0) {
-        fprintf(stderr, "WARNING: Couldn't query db for server infos for host %s\n", hostname);
-        return NULL;
-    }
-    MYSQL_RES *result = mysql_store_result(db);
-    if (result == NULL) {
-        fprintf(stderr, "FATAL: Couldn't retrieve server infos for %s from database.\n", hostname);
-        return NULL;
-    }
-
-    MYSQL_ROW row = mysql_fetch_row(result);
-    if (row == NULL) {
-        fprintf(stderr, "FATAL: Couldn't retrieve server db results for %s from database.\n", hostname);
-        mysql_free_result(result);
-        return NULL;
-    }
-
-    struct db_host_info * info = malloc(sizeof(struct db_host_info));
-    memset(info, 0, sizeof(struct db_host_info));
-
-    size_t len = strlen(row[0]);
-    info->privkeytxt = malloc(len+1);
-    strcpy(info->privkeytxt, row[0]);
-
-    if (strncmp(row[1], "ssh://", 6) != 0) {
-        fprintf(stderr, "FATAL: invalid host url %s\n", row[1]);
-        return NULL;
-    }
-    size_t at_pos = 0;
-    char done = 0;
-    for(size_t i = 6; !done; ++i) {
-        switch(*(row[1]+i)) {
-          case '@':
-            info->username = malloc(i-6+1);
-            strncpy(info->username, row[1]+6, i-6);
-            info->username[i-6] = '\0';
-            at_pos = i;
-            break;
-          case '\0':
-            info->address = malloc(i-at_pos);
-            strncpy(info->address, row[1]+at_pos+1, i-at_pos-1);
-            info->address[i-at_pos-1] = '\0';
-            done = 1;
-            break;
-        }
-        if (i > MAX_HOSTNAME_LENGTH + MAX_USERNAME_LENGTH + 6 + 1) {
-            fprintf(stderr, "FATAL: Couldn't parse host url for host %s, too long.\n", hostname);
-            if (info->username != NULL)
-                free(info->username);
-            return NULL;
-        }
-    }
-
-    len = strlen(row[2]);
-    info->hostkeyhash = malloc(len+1);
-    strcpy(info->hostkeyhash, row[2]);
-
-    mysql_free_result(result);
-    return info;
-}
-
-void db_set_host_publickey_hash(const char * hostname, const char * hash)
-{
-    char buff[255];
-    sprintf(buff, "UPDATE ssh_keys, hosts SET host_key = \"%s\" WHERE ssh_keys.id = hosts.ssh_key_id and hosts.name = \"%s\"", hash, hostname);
-    int res = mysql_query(db, buff);
-    if (res != 0) {
-        fprintf(stderr, "WARNING: Couldn't set host key for host %s: %s\n", hostname, hash);
-        return;
-    }
-    res = mysql_commit(db);
-    if (res != 0) {
-        fprintf(stderr, "WARNING: Couldn't commit after setting host key for host %s: %s\n", hostname, hash);
-    }
-}
-
-unsigned long long // returns 0 on error, or the session_id
-db_init_session_and_get_id(const char * hostname, const char * username)
-{
-    char buff[255];
-    sprintf(buff, "INSERT INTO sessions (created_at, status, user_id, host_id) SELECT NOW(), \"opened\", users.id, hosts.id from users, hosts WHERE users.name = \"%s\" and hosts.name = \"%s\"", username, hostname);
-    int res = mysql_query(db, buff);
-    if (res != 0) {
-        fprintf(stderr, "FATAL: Couldn't insert new session in database for %s to %s\n", username, hostname);
-        return 0;
-    }
-    unsigned long long id = mysql_insert_id(db);
-    if (id == 0) {
-        fprintf(stderr, "FATAL: Didn't get proper mysql last insert id after inserting new session for %s to %s\n", username, hostname);
-        return 0;
-    }
-    res = mysql_commit(db);
-    if (res != 0) {
-        fprintf(stderr, "FATAL: Couldn't commit after inserting session for %s to %s\n", username, hostname);
-        return 0;
-    }
-    return id;
-}
-
-void db_free_host_info(struct db_host_info * info)
-{
-    free(info->privkeytxt);
-    free(info->address);
-    free(info->username);
-    free(info->hostkeyhash);
-    free(info);
-}
diff --git a/common/mysql.h b/common/mysql.h
deleted file mode 100644
index ac9a360..0000000
--- a/common/mysql.h
+++ /dev/null
@@ -1,22 +0,0 @@
-#ifndef COMMON_MYSQL_H_
-#define COMMON_MYSQL_H_
-
-struct db_host_info {
-    char * privkeytxt;
-    char * address;
-    char * username;
-    char * hostkeyhash;
-};
-
-char db_init(void);
-void db_clean(void);
-char * // returns NULL if no user found, this char * is to be freed from the calling code
-db_get_username_from_pubkey(ssh_key pubkey);
-struct db_host_info * // returns NULL if no key found, this char * is to be freed from the calling code
-db_get_host_info(const char * hostname);
-void db_set_host_publickey_hash(const char * hostname, const char * hash);
-unsigned long long // returns 0 on error, or the session_id
-db_init_session_and_get_id(const char * hostname, const char * username);
-void db_free_host_info(struct db_host_info * info);
-
-#endif