diff options
Diffstat (limited to 'storage_xml.c')
| -rw-r--r-- | storage_xml.c | 503 |
1 files changed, 503 insertions, 0 deletions
diff --git a/storage_xml.c b/storage_xml.c new file mode 100644 index 00000000..f37fce44 --- /dev/null +++ b/storage_xml.c @@ -0,0 +1,503 @@ + /********************************************************************\ + * BitlBee -- An IRC to other IM-networks gateway * + * * + * Copyright 2002-2006 Wilmer van der Gaast and others * + \********************************************************************/ + +/* Storage backend that uses an XMLish format for all data. */ + +/* + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License with + the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL; + if not, write to the Free Software Foundation, Inc., 59 Temple Place, + Suite 330, Boston, MA 02111-1307 USA +*/ + +#define BITLBEE_CORE +#include "bitlbee.h" +#include "base64.h" +#include "arc.h" +#include "md5.h" + +typedef enum +{ + XML_PASS_CHECK_ONLY = -1, + XML_PASS_UNKNOWN = 0, + XML_PASS_WRONG, + XML_PASS_OK +} xml_pass_st; + +/* To make it easier later when extending the format: */ +#define XML_FORMAT_VERSION 1 + +struct xml_parsedata +{ + irc_t *irc; + char *current_setting; + account_t *current_account; + char *given_nick; + char *given_pass; + xml_pass_st pass_st; +}; + +static char *xml_attr( const gchar **attr_names, const gchar **attr_values, const gchar *key ) +{ + int i; + + for( i = 0; attr_names[i]; i ++ ) + if( g_strcasecmp( attr_names[i], key ) == 0 ) + return (char*) attr_values[i]; + + return NULL; +} + +static void xml_destroy_xd( gpointer data ) +{ + struct xml_parsedata *xd = data; + + g_free( xd->given_nick ); + g_free( xd->given_pass ); + g_free( xd ); +} + +static void xml_start_element( GMarkupParseContext *ctx, const gchar *element_name, const gchar **attr_names, const gchar **attr_values, gpointer data, GError **error ) +{ + struct xml_parsedata *xd = data; + irc_t *irc = xd->irc; + + if( g_strcasecmp( element_name, "user" ) == 0 ) + { + char *nick = xml_attr( attr_names, attr_values, "nick" ); + char *pass = xml_attr( attr_names, attr_values, "password" ); + int st; + + if( !nick || !pass ) + { + g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT, + "Missing attributes for %s element", element_name ); + } + else if( ( st = md5_verify_password( xd->given_pass, pass ) ) == -1 ) + { + xd->pass_st = XML_PASS_WRONG; + g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT, + "Error while decoding password attribute" ); + } + else if( st == 0 ) + { + if( xd->pass_st != XML_PASS_CHECK_ONLY ) + xd->pass_st = XML_PASS_OK; + } + else + { + xd->pass_st = XML_PASS_WRONG; + g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT, + "Password mismatch" ); + } + } + else if( xd->pass_st < XML_PASS_OK ) + { + /* Let's not parse anything else if we only have to check + the password. */ + } + else if( g_strcasecmp( element_name, "account" ) == 0 ) + { + char *protocol, *handle, *server, *password = NULL, *autoconnect; + char *pass_b64 = NULL; + unsigned char *pass_cr = NULL; + int pass_len; + struct prpl *prpl = NULL; + + handle = xml_attr( attr_names, attr_values, "handle" ); + pass_b64 = xml_attr( attr_names, attr_values, "password" ); + server = xml_attr( attr_names, attr_values, "server" ); + autoconnect = xml_attr( attr_names, attr_values, "autoconnect" ); + + protocol = xml_attr( attr_names, attr_values, "protocol" ); + if( protocol ) + prpl = find_protocol( protocol ); + + if( !handle || !pass_b64 || !protocol ) + g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT, + "Missing attributes for %s element", element_name ); + else if( !prpl ) + g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT, + "Unknown protocol: %s", protocol ); + else if( ( pass_len = base64_decode( pass_b64, (unsigned char**) &pass_cr ) ) && + arc_decode( pass_cr, pass_len, &password, xd->given_pass ) ) + { + xd->current_account = account_add( irc, prpl, handle, password ); + if( server ) + set_setstr( &xd->current_account->set, "server", server ); + if( autoconnect ) + set_setstr( &xd->current_account->set, "auto_connect", autoconnect ); + } + else + { + /* Actually the _decode functions don't even return error codes, + but maybe they will later... */ + g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT, + "Error while decrypting account password" ); + } + + g_free( pass_cr ); + g_free( password ); + } + else if( g_strcasecmp( element_name, "setting" ) == 0 ) + { + char *setting; + + if( xd->current_setting ) + { + g_free( xd->current_setting ); + xd->current_setting = NULL; + } + + if( ( setting = xml_attr( attr_names, attr_values, "name" ) ) ) + xd->current_setting = g_strdup( setting ); + else + g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT, + "Missing attributes for %s element", element_name ); + } + else if( g_strcasecmp( element_name, "buddy" ) == 0 ) + { + char *handle, *nick; + + handle = xml_attr( attr_names, attr_values, "handle" ); + nick = xml_attr( attr_names, attr_values, "nick" ); + + if( xd->current_account && handle && nick ) + { + nick_set( xd->current_account, handle, nick ); + } + else + { + g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT, + "Missing attributes for %s element", element_name ); + } + } + else + { + g_set_error( error, G_MARKUP_ERROR, G_MARKUP_ERROR_UNKNOWN_ELEMENT, + "Unkown element: %s", element_name ); + } +} + +static void xml_end_element( GMarkupParseContext *ctx, const gchar *element_name, gpointer data, GError **error ) +{ + struct xml_parsedata *xd = data; + + if( g_strcasecmp( element_name, "setting" ) == 0 && xd->current_setting ) + { + g_free( xd->current_setting ); + xd->current_setting = NULL; + } + else if( g_strcasecmp( element_name, "account" ) == 0 ) + { + xd->current_account = NULL; + } +} + +static void xml_text( GMarkupParseContext *ctx, const gchar *text_orig, gsize text_len, gpointer data, GError **error ) +{ + char text[text_len+1]; + struct xml_parsedata *xd = data; + irc_t *irc = xd->irc; + + strncpy( text, text_orig, text_len ); + text[text_len] = 0; + + if( xd->pass_st < XML_PASS_OK ) + { + /* Let's not parse anything else if we only have to check + the password, or if we didn't get the chance to check it + yet. */ + } + else if( g_strcasecmp( g_markup_parse_context_get_element( ctx ), "setting" ) == 0 && xd->current_setting ) + { + set_setstr( xd->current_account ? &xd->current_account->set : &irc->set, + xd->current_setting, (char*) text ); + g_free( xd->current_setting ); + xd->current_setting = NULL; + } +} + +GMarkupParser xml_parser = +{ + xml_start_element, + xml_end_element, + xml_text, + NULL, + NULL +}; + +static void xml_init( void ) +{ + if( access( global.conf->configdir, F_OK ) != 0 ) + log_message( LOGLVL_WARNING, "The configuration directory `%s' does not exist. Configuration won't be saved.", global.conf->configdir ); + else if( access( global.conf->configdir, R_OK ) != 0 || access( global.conf->configdir, W_OK ) != 0 ) + log_message( LOGLVL_WARNING, "Permission problem: Can't read/write from/to `%s'.", global.conf->configdir ); +} + +static storage_status_t xml_load_real( const char *my_nick, const char *password, irc_t *irc, xml_pass_st action ) +{ + GMarkupParseContext *ctx; + struct xml_parsedata *xd; + char *fn, buf[512]; + GError *gerr = NULL; + int fd, st; + + if( irc && irc->status & USTATUS_IDENTIFIED ) + return( 1 ); + + xd = g_new0( struct xml_parsedata, 1 ); + xd->irc = irc; + xd->given_nick = g_strdup( my_nick ); + xd->given_pass = g_strdup( password ); + xd->pass_st = action; + nick_lc( xd->given_nick ); + + fn = g_strdup_printf( "%s%s%s", global.conf->configdir, xd->given_nick, ".xml" ); + if( ( fd = open( fn, O_RDONLY ) ) < 0 ) + { + xml_destroy_xd( xd ); + g_free( fn ); + return STORAGE_NO_SUCH_USER; + } + g_free( fn ); + + ctx = g_markup_parse_context_new( &xml_parser, 0, xd, xml_destroy_xd ); + + while( ( st = read( fd, buf, sizeof( buf ) ) ) > 0 ) + { + if( !g_markup_parse_context_parse( ctx, buf, st, &gerr ) || gerr ) + { + xml_pass_st pass_st = xd->pass_st; + + g_markup_parse_context_free( ctx ); + close( fd ); + + if( pass_st == XML_PASS_WRONG ) + { + g_clear_error( &gerr ); + return STORAGE_INVALID_PASSWORD; + } + else + { + if( gerr && irc ) + irc_usermsg( irc, "Error from XML-parser: %s", gerr->message ); + + g_clear_error( &gerr ); + return STORAGE_OTHER_ERROR; + } + } + } + /* Just to be sure... */ + g_clear_error( &gerr ); + + g_markup_parse_context_free( ctx ); + close( fd ); + + if( action == XML_PASS_CHECK_ONLY ) + return STORAGE_OK; + + irc->status |= USTATUS_IDENTIFIED; + + return STORAGE_OK; +} + +static storage_status_t xml_load( const char *my_nick, const char *password, irc_t *irc ) +{ + return xml_load_real( my_nick, password, irc, XML_PASS_UNKNOWN ); +} + +static storage_status_t xml_check_pass( const char *my_nick, const char *password ) +{ + /* This is a little bit risky because we have to pass NULL for the + irc_t argument. This *should* be fine, if I didn't miss anything... */ + return xml_load_real( my_nick, password, NULL, XML_PASS_CHECK_ONLY ); +} + +static int xml_printf( int fd, int indent, char *fmt, ... ) +{ + va_list params; + char *out; + char tabs[9] = "\t\t\t\t\t\t\t\t"; + int len; + + /* Maybe not very clean, but who needs more than 8 levels of indentation anyway? */ + if( write( fd, tabs, indent <= 8 ? indent : 8 ) != indent ) + return 0; + + va_start( params, fmt ); + out = g_markup_vprintf_escaped( fmt, params ); + va_end( params ); + + len = strlen( out ); + len -= write( fd, out, len ); + g_free( out ); + + return len == 0; +} + +static gboolean xml_save_nick( gpointer key, gpointer value, gpointer data ); + +static storage_status_t xml_save( irc_t *irc, int overwrite ) +{ + char path[512], *path2, *pass_buf = NULL; + set_t *set; + account_t *acc; + int fd; + md5_byte_t pass_md5[21]; + md5_state_t md5_state; + + if( irc->password == NULL ) + { + irc_usermsg( irc, "Please register yourself if you want to save your settings." ); + return STORAGE_OTHER_ERROR; + } + + path2 = g_strdup( irc->nick ); + nick_lc( path2 ); + g_snprintf( path, sizeof( path ) - 2, "%s%s%s", global.conf->configdir, path2, ".xml" ); + g_free( path2 ); + + if( !overwrite && access( path, F_OK ) != -1 ) + return STORAGE_ALREADY_EXISTS; + + strcat( path, "~" ); + if( ( fd = open( path, O_WRONLY | O_CREAT | O_TRUNC, 0600 ) ) < 0 ) + { + irc_usermsg( irc, "Error while opening configuration file." ); + return STORAGE_OTHER_ERROR; + } + + /* Generate a salted md5sum of the password. Use 5 bytes for the salt + (to prevent dictionary lookups of passwords) to end up with a 21- + byte password hash, more convenient for base64 encoding. */ + random_bytes( pass_md5 + 16, 5 ); + md5_init( &md5_state ); + md5_append( &md5_state, (md5_byte_t*) irc->password, strlen( irc->password ) ); + md5_append( &md5_state, pass_md5 + 16, 5 ); /* Add the salt. */ + md5_finish( &md5_state, pass_md5 ); + /* Save the hash in base64-encoded form. */ + pass_buf = base64_encode( pass_md5, 21 ); + + if( !xml_printf( fd, 0, "<user nick=\"%s\" password=\"%s\" version=\"%d\">\n", irc->nick, pass_buf, XML_FORMAT_VERSION ) ) + goto write_error; + + g_free( pass_buf ); + + for( set = irc->set; set; set = set->next ) + if( set->value && set->def ) + if( !xml_printf( fd, 1, "<setting name=\"%s\">%s</setting>\n", set->key, set->value ) ) + goto write_error; + + for( acc = irc->accounts; acc; acc = acc->next ) + { + unsigned char *pass_cr; + char *pass_b64; + int pass_len; + + pass_len = arc_encode( acc->pass, strlen( acc->pass ), (unsigned char**) &pass_cr, irc->password, 12 ); + pass_b64 = base64_encode( pass_cr, pass_len ); + g_free( pass_cr ); + + if( !xml_printf( fd, 1, "<account protocol=\"%s\" handle=\"%s\" password=\"%s\" autoconnect=\"%d\"", acc->prpl->name, acc->user, pass_b64, acc->auto_connect ) ) + { + g_free( pass_b64 ); + goto write_error; + } + g_free( pass_b64 ); + + if( acc->server && acc->server[0] && !xml_printf( fd, 0, " server=\"%s\"", acc->server ) ) + goto write_error; + if( !xml_printf( fd, 0, ">\n" ) ) + goto write_error; + + for( set = acc->set; set; set = set->next ) + if( set->value && set->def && !( set->flags & ACC_SET_NOSAVE ) ) + if( !xml_printf( fd, 2, "<setting name=\"%s\">%s</setting>\n", set->key, set->value ) ) + goto write_error; + + /* This probably looks pretty strange. g_hash_table_foreach + is quite a PITA already (but it can't get much better in + C without using #define, I'm afraid), and since it + doesn't seem to be possible to abort the foreach on write + errors, so instead let's use the _find function and + return TRUE on write errors. Which means, if we found + something, there was an error. :-) */ + if( g_hash_table_find( acc->nicks, xml_save_nick, & fd ) ) + goto write_error; + + if( !xml_printf( fd, 1, "</account>\n" ) ) + goto write_error; + } + + if( !xml_printf( fd, 0, "</user>\n" ) ) + goto write_error; + + close( fd ); + + path2 = g_strndup( path, strlen( path ) - 1 ); + if( rename( path, path2 ) != 0 ) + { + irc_usermsg( irc, "Error while renaming temporary configuration file." ); + + g_free( path2 ); + unlink( path ); + + return STORAGE_OTHER_ERROR; + } + + g_free( path2 ); + + return STORAGE_OK; + +write_error: + g_free( pass_buf ); + + irc_usermsg( irc, "Write error. Disk full?" ); + close( fd ); + + return STORAGE_OTHER_ERROR; +} + +static gboolean xml_save_nick( gpointer key, gpointer value, gpointer data ) +{ + return !xml_printf( *( (int*) data ), 2, "<buddy handle=\"%s\" nick=\"%s\" />\n", key, value ); +} + +static storage_status_t xml_remove( const char *nick, const char *password ) +{ + char s[512]; + storage_status_t status; + + status = xml_check_pass( nick, password ); + if( status != STORAGE_OK ) + return status; + + g_snprintf( s, 511, "%s%s%s", global.conf->configdir, nick, ".xml" ); + if( unlink( s ) == -1 ) + return STORAGE_OTHER_ERROR; + + return STORAGE_OK; +} + +storage_t storage_xml = { + .name = "xml", + .init = xml_init, + .check_pass = xml_check_pass, + .remove = xml_remove, + .load = xml_load, + .save = xml_save +}; |