X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/f6033c46c877646b95bc2e99ce69097203bc5c77..5a7df0480aa9e958e612b2da9addd589d404fd95:/server/server.c diff --git a/server/server.c b/server/server.c index 1e4c6ca..3d59398 100644 --- a/server/server.c +++ b/server/server.c @@ -1,6 +1,6 @@ /* * This file is part of DisOrder. - * Copyright (C) 2004, 2005, 2006, 2007 Richard Kettlewell + * Copyright (C) 2004-2008 Richard Kettlewell * * 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 @@ -51,6 +51,7 @@ #include "split.h" #include "configuration.h" #include "hex.h" +#include "rights.h" #include "trackdb.h" #include "table.h" #include "kvp.h" @@ -63,11 +64,22 @@ #include "eventlog.h" #include "defs.h" #include "cache.h" +#include "unicode.h" +#include "cookies.h" +#include "base64.h" +#include "hash.h" +#include "mime.h" +#include "sendmail.h" +#include "wstat.h" #ifndef NONCE_SIZE # define NONCE_SIZE 16 #endif +#ifndef CONFIRM_SIZE +# define CONFIRM_SIZE 10 +#endif + int volume_left, volume_right; /* last known volume */ /** @brief Accept all well-formed login attempts @@ -81,22 +93,44 @@ struct listener { int pf; }; +/** @brief One client connection */ struct conn { + /** @brief Read commands from here */ ev_reader *r; + /** @brief Send responses to here */ ev_writer *w; + /** @brief Underlying file descriptor */ int fd; + /** @brief Unique identifier for connection used in log messages */ unsigned tag; + /** @brief Login name or NULL */ char *who; + /** @brief Event loop */ ev_source *ev; + /** @brief Nonce chosen for this connection */ unsigned char nonce[NONCE_SIZE]; + /** @brief Current reader callback + * + * We change this depending on whether we're servicing the @b log command + */ ev_reader_callback *reader; + /** @brief Event log output sending to this connection */ struct eventlog_output *lo; + /** @brief Parent listener */ const struct listener *l; + /** @brief Login cookie or NULL */ + char *cookie; + /** @brief Connection rights */ + rights_type rights; + /** @brief Next connection */ + struct conn *next; }; +/** @brief Linked list of connections */ +static struct conn *connections; + static int reader_callback(ev_source *ev, ev_reader *reader, - int fd, void *ptr, size_t bytes, int eof, @@ -104,64 +138,65 @@ static int reader_callback(ev_source *ev, static const char *noyes[] = { "no", "yes" }; +/** @brief Remove a connection from the connection list */ +static void remove_connection(struct conn *c) { + struct conn **cc; + + for(cc = &connections; *cc && *cc != c; cc = &(*cc)->next) + ; + if(*cc) + *cc = c->next; +} + +/** @brief Called when a connection's writer fails or is shut down + * + * If the connection still has a raeder that is cancelled. + */ static int writer_error(ev_source attribute((unused)) *ev, - int fd, int errno_value, void *u) { struct conn *c = u; - D(("server writer_error %d %d", fd, errno_value)); + D(("server writer_error S%x %d", c->tag, errno_value)); if(errno_value == 0) { /* writer is done */ - c->w = 0; - if(c->r == 0) { - //D(("server writer_error closes %d", fd)); - info("server writer_error closes %d because all done", fd); /* TODO */ - xclose(fd); /* reader is done too, close */ - } else { - //D(("server writer_error shutdown %d SHUT_WR", fd)); - info("server writer_error shutdown %d SHUT_WR", fd); /* TODO */ - xshutdown(fd, SHUT_WR); /* reader is not done yet */ - } + D(("S%x writer completed", c->tag)); } else { if(errno_value != EPIPE) error(errno_value, "S%x write error on socket", c->tag); - if(c->r) + if(c->r) { + D(("cancel reader")); ev_reader_cancel(c->r); - info("server writer_error closes %d because errno=%d", fd, errno_value); /* TODO */ - xclose(fd); + c->r = 0; + } + D(("done cancel reader")); } + c->w = 0; + ev_report(ev); + remove_connection(c); return 0; } +/** @brief Called when a conncetion's reader fails or is shut down + * + * If connection still has a writer then it is closed. + */ static int reader_error(ev_source attribute((unused)) *ev, - int fd, int errno_value, void *u) { struct conn *c = u; - D(("server reader_error %d %d", fd, errno_value)); - error(errno, "S%x read error on socket", c->tag); - if(c->w) { - ev_writer_cancel(c->w); - c->w = 0; - } + D(("server reader_error S%x %d", c->tag, errno_value)); + error(errno_value, "S%x read error on socket", c->tag); + if(c->w) + ev_writer_close(c->w); + c->w = 0; + c->r = 0; ev_report(ev); - info("reader_error closing fd %d", fd); /* TODO */ - xclose(fd); + remove_connection(c); return 0; } -/* return true if we are talking to a trusted user */ -static int trusted(struct conn *c) { - int n; - - for(n = 0; (n < config->trust.n - && strcmp(config->trust.s[n], c->who)); ++n) - ; - return n < config->trust.n; -} - static int c_disable(struct conn *c, char **vec, int nvec) { if(nvec == 0) disable_playing(c->who); @@ -212,7 +247,7 @@ static int c_play(struct conn *c, char **vec, * anything. */ if(q == qhead.next && playing) prepare(c->ev, q); - sink_writes(ev_writer_sink(c->w), "250 queued\n"); + sink_printf(ev_writer_sink(c->w), "252 %s\n", q->id); /* If the queue was empty but we are for some reason paused then * unpause. */ if(!playing) resume_playing(0); @@ -228,19 +263,17 @@ static int c_remove(struct conn *c, char **vec, sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n"); return 1; } - if(config->restrictions & RESTRICT_REMOVE) { - /* can only remove tracks that you submitted */ - if(!q->submitter || strcmp(q->submitter, c->who)) { - sink_writes(ev_writer_sink(c->w), "550 you didn't submit that track!\n"); - return 1; - } + if(!right_removable(c->rights, c->who, q)) { + error(0, "%s attempted remove but lacks required rights", c->who); + sink_writes(ev_writer_sink(c->w), + "510 Not authorized to remove that track\n"); + return 1; } queue_remove(q, c->who); /* De-prepare the track. */ abandon(c->ev, q); - /* If we removed the random track then add another one. */ - if(q->state == playing_random) - add_random_track(); + /* See about adding a new random track */ + add_random_track(c->ev); /* Prepare whatever the next head track is. */ if(qhead.next != &qhead) prepare(c->ev, qhead.next); @@ -256,12 +289,14 @@ static int c_scratch(struct conn *c, sink_writes(ev_writer_sink(c->w), "250 nothing is playing\n"); return 1; /* completed */ } - if(config->restrictions & RESTRICT_SCRATCH) { - /* can only scratch tracks you submitted and randomly selected ones */ - if(playing->submitter && strcmp(playing->submitter, c->who)) { - sink_writes(ev_writer_sink(c->w), "550 you didn't submit that track!\n"); - return 1; - } + /* TODO there is a bug here: if we specify an ID but it's not the currently + * playing track then you will get 550 if you weren't authorized to scratch + * the currently playing track. */ + if(!right_scratchable(c->rights, c->who, playing)) { + error(0, "%s attempted scratch but lacks required rights", c->who); + sink_writes(ev_writer_sink(c->w), + "510 Not authorized to scratch that track\n"); + return 1; } scratch(c->who, nvec == 1 ? vec[0] : 0); /* If you scratch an unpaused track then it is automatically unpaused */ @@ -324,7 +359,7 @@ static int c_rescan(struct conn *c, char attribute((unused)) **vec, int attribute((unused)) nvec) { info("S%x rescan by %s", c->tag, c->who); - trackdb_rescan(c->ev); + trackdb_rescan(c->ev, 1/*check*/); sink_writes(ev_writer_sink(c->w), "250 initiated rescan\n"); return 1; /* completed */ } @@ -333,7 +368,7 @@ static int c_version(struct conn *c, char attribute((unused)) **vec, int attribute((unused)) nvec) { /* VERSION had better only use the basic character set */ - sink_printf(ev_writer_sink(c->w), "251 %s\n", disorder_version_string); + sink_printf(ev_writer_sink(c->w), "251 %s\n", disorder_short_version_string); return 1; /* completed */ } @@ -349,64 +384,81 @@ static int c_playing(struct conn *c, return 1; /* completed */ } -static int c_become(struct conn *c, - char **vec, - int attribute((unused)) nvec) { - c->who = vec[0]; - sink_writes(ev_writer_sink(c->w), "230 OK\n"); - return 1; -} - -static int c_user(struct conn *c, - char **vec, - int attribute((unused)) nvec) { - int n; - const char *res; +static const char *connection_host(struct conn *c) { union { struct sockaddr sa; struct sockaddr_in in; struct sockaddr_in6 in6; } u; socklen_t l; + int n; char host[1024]; - if(c->who) { - sink_writes(ev_writer_sink(c->w), "530 already authenticated\n"); - return 1; - } /* get connection data */ l = sizeof u; if(getpeername(c->fd, &u.sa, &l) < 0) { error(errno, "S%x error calling getpeername", c->tag); - sink_writes(ev_writer_sink(c->w), "530 authentication failure\n"); - return 1; + return 0; } if(c->l->pf != PF_UNIX) { if((n = getnameinfo(&u.sa, l, host, sizeof host, 0, 0, NI_NUMERICHOST))) { error(0, "S%x error calling getnameinfo: %s", c->tag, gai_strerror(n)); - sink_writes(ev_writer_sink(c->w), "530 authentication failure\n"); - return 1; + return 0; } + return xstrdup(host); } else - strcpy(host, "local"); + return "local"; +} + +static int c_user(struct conn *c, + char **vec, + int attribute((unused)) nvec) { + struct kvp *k; + const char *res, *host, *password; + rights_type rights; + + if(c->who) { + sink_writes(ev_writer_sink(c->w), "530 already authenticated\n"); + return 1; + } + /* get connection data */ + if(!(host = connection_host(c))) { + sink_writes(ev_writer_sink(c->w), "530 authentication failure\n"); + return 1; + } /* find the user */ - for(n = 0; n < config->allow.n - && strcmp(config->allow.s[n].s[0], vec[0]); ++n) - ; - /* if it's a real user check whether the response is right */ - if(n >= config->allow.n) { - info("S%x unknown user '%s' from %s", c->tag, vec[0], host); + k = trackdb_getuserinfo(vec[0]); + /* reject nonexistent users */ + if(!k) { + error(0, "S%x unknown user '%s' from %s", c->tag, vec[0], host); sink_writes(ev_writer_sink(c->w), "530 authentication failed\n"); return 1; } - res = authhash(c->nonce, sizeof c->nonce, config->allow.s[n].s[1], + /* reject unconfirmed users */ + if(kvp_get(k, "confirmation")) { + error(0, "S%x unconfirmed user '%s' from %s", c->tag, vec[0], host); + sink_writes(ev_writer_sink(c->w), "530 authentication failed\n"); + return 1; + } + password = kvp_get(k, "password"); + if(!password) password = ""; + if(parse_rights(kvp_get(k, "rights"), &rights, 1)) { + error(0, "error parsing rights for %s", vec[0]); + sink_writes(ev_writer_sink(c->w), "530 authentication failed\n"); + return 1; + } + /* check whether the response is right */ + res = authhash(c->nonce, sizeof c->nonce, password, config->authorization_algorithm); if(wideopen || (res && !strcmp(res, vec[1]))) { c->who = vec[0]; + c->rights = rights; /* currently we only bother logging remote connections */ - if(c->l->pf != PF_UNIX) + if(strcmp(host, "local")) info("S%x %s connected from %s", c->tag, vec[0], host); + else + c->rights |= RIGHT__LOCAL; sink_writes(ev_writer_sink(c->w), "230 OK\n"); return 1; } @@ -565,9 +617,9 @@ static int c_get(struct conn *c, const char *v; if(vec[1][0] != '_' && (v = trackdb_get(vec[0], vec[1]))) - sink_printf(ev_writer_sink(c->w), "252 %s\n", v); + sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(v)); else - sink_writes(ev_writer_sink(c->w), "550 not found\n"); + sink_writes(ev_writer_sink(c->w), "555 not found\n"); return 1; } @@ -581,7 +633,7 @@ static int c_length(struct conn *c, return 1; } if((v = trackdb_get(track, "_length"))) - sink_printf(ev_writer_sink(c->w), "252 %s\n", v); + sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(v)); else sink_writes(ev_writer_sink(c->w), "550 not found\n"); return 1; @@ -691,6 +743,7 @@ static int c_volume(struct conn *c, int nvec) { int l, r, set; char lb[32], rb[32]; + rights_type rights; switch(nvec) { case 0: @@ -708,7 +761,13 @@ static int c_volume(struct conn *c, default: abort(); } - if(mixer_control(&l, &r, set)) + rights = set ? RIGHT_VOLUME : RIGHT_READ; + if(!(c->rights & rights)) { + error(0, "%s attempted to set volume but lacks required rights", c->who); + sink_writes(ev_writer_sink(c->w), "510 Prohibited\n"); + return 1; + } + if(mixer_control(-1/*as configured*/, &l, &r, set)) sink_writes(ev_writer_sink(c->w), "550 error accessing mixer\n"); else { sink_printf(ev_writer_sink(c->w), "252 %d %d\n", l, r); @@ -723,27 +782,32 @@ static int c_volume(struct conn *c, return 1; } -/* we are logging, and some data is available to read */ -static int logging_reader_callback(ev_source *ev, +/** @brief Called when data arrives on a log connection + * + * We just discard all such data. The client may occasionally send data as a + * keepalive. + */ +static int logging_reader_callback(ev_source attribute((unused)) *ev, ev_reader *reader, - int fd, - void *ptr, + void attribute((unused)) *ptr, size_t bytes, - int eof, - void *u) { + int attribute((unused)) eof, + void attribute((unused)) *u) { struct conn *c = u; - /* don't log to this conn any more */ - eventlog_remove(c->lo); - if(c->w) { - /* Terminate the log output, but only if the writer hasn't been killed off - * from a failure on some earlier write */ - sink_writes(ev_writer_sink(c->w), ".\n"); + ev_reader_consume(reader, bytes); + if(eof) { + /* Oops, that's all for now */ + D(("logging reader eof")); + if(c->w) { + D(("close writer")); + ev_writer_close(c->w); + c->w = 0; + } + c->r = 0; + remove_connection(c); } - /* restore the reader callback */ - c->reader = reader_callback; - /* ...and exit via it */ - return c->reader(ev, reader, fd, ptr, bytes, eof, u); + return 0; } static void logclient(const char *msg, void *user) { @@ -789,17 +853,20 @@ static int c_log(struct conn *c, return 0; } -static void post_move_cleanup(void) { - struct queue_entry *q; +/** @brief Test whether a move is allowed + * @param c Connection + * @param qs List of IDs on queue + * @param nqs Number of IDs + * @return 0 if move is prohibited, non-0 if it is allowed + */ +static int has_move_rights(struct conn *c, struct queue_entry **qs, int nqs) { + for(; nqs > 0; ++qs, --nqs) { + struct queue_entry *const q = *qs; - /* If we have caused any random tracks to not be at the end then we make them - * no longer be random. */ - for(q = qhead.next; q != &qhead; q = q->next) - if(q->state == playing_random && q->next != &qhead) - q->state = playing_unplayed; - /* That might mean we need to add a new random track. */ - add_random_track(); - queue_write(); + if(!right_movable(c->rights, c->who, q)) + return 0; + } + return 1; } static int c_move(struct conn *c, @@ -808,19 +875,17 @@ static int c_move(struct conn *c, struct queue_entry *q; int n; - if(config->restrictions & RESTRICT_MOVE) { - if(!trusted(c)) { - sink_writes(ev_writer_sink(c->w), - "550 only trusted users can move tracks\n"); - return 1; - } - } if(!(q = queue_find(vec[0]))) { sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n"); return 1; } + if(!has_move_rights(c, &q, 1)) { + error(0, "%s attempted move but lacks required rights", c->who); + sink_writes(ev_writer_sink(c->w), + "510 Not authorized to move that track\n"); + return 1; + } n = queue_move(q, atoi(vec[1]), c->who); - post_move_cleanup(); sink_printf(ev_writer_sink(c->w), "252 %d\n", n); /* If we've moved to the head of the queue then prepare the track. */ if(q == qhead.next) @@ -834,13 +899,6 @@ static int c_moveafter(struct conn *c, struct queue_entry *q, **qs; int n; - if(config->restrictions & RESTRICT_MOVE) { - if(!trusted(c)) { - sink_writes(ev_writer_sink(c->w), - "550 only trusted users can move tracks\n"); - return 1; - } - } if(vec[0][0]) { if(!(q = queue_find(vec[0]))) { sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n"); @@ -856,8 +914,13 @@ static int c_moveafter(struct conn *c, sink_writes(ev_writer_sink(c->w), "550 no such track on the queue\n"); return 1; } + if(!has_move_rights(c, qs, nvec)) { + error(0, "%s attempted moveafter but lacks required rights", c->who); + sink_writes(ev_writer_sink(c->w), + "510 Not authorized to move those tracks\n"); + return 1; + } queue_moveafter(q, nvec, qs, c->who); - post_move_cleanup(); sink_printf(ev_writer_sink(c->w), "250 Moved tracks\n"); /* If we've moved to the head of the queue then prepare the track. */ if(q == qhead.next) @@ -869,7 +932,7 @@ static int c_part(struct conn *c, char **vec, int attribute((unused)) nvec) { sink_printf(ev_writer_sink(c->w), "252 %s\n", - trackdb_getpart(vec[0], vec[1], vec[2])); + quoteutf8(trackdb_getpart(vec[0], vec[1], vec[2]))); return 1; } @@ -882,7 +945,7 @@ static int c_resolve(struct conn *c, sink_writes(ev_writer_sink(c->w), "550 cannot resolve track\n"); return 1; } - sink_printf(ev_writer_sink(c->w), "252 %s\n", track); + sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(track)); return 1; } @@ -899,12 +962,15 @@ static int c_tags(struct conn *c, } sink_writes(ev_writer_sink(c->w), ".\n"); return 1; /* completed */ - } static int c_set_global(struct conn *c, char **vec, int attribute((unused)) nvec) { + if(vec[0][0] == '_') { + sink_writes(ev_writer_sink(c->w), "550 cannot set internal global preferences\n"); + return 1; + } trackdb_set_global(vec[0], vec[1], c->who); sink_printf(ev_writer_sink(c->w), "250 OK\n"); return 1; @@ -916,9 +982,9 @@ static int c_get_global(struct conn *c, const char *s = trackdb_get_global(vec[0]); if(s) - sink_printf(ev_writer_sink(c->w), "252 %s\n", s); + sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(s)); else - sink_writes(ev_writer_sink(c->w), "550 not found\n"); + sink_writes(ev_writer_sink(c->w), "555 not found\n"); return 1; } @@ -932,9 +998,18 @@ static int c_nop(struct conn *c, static int c_new(struct conn *c, char **vec, int nvec) { - char **tracks = trackdb_new(0, nvec > 0 ? atoi(vec[0]) : INT_MAX); + int max, n; + char **tracks; + if(nvec > 0) + max = atoi(vec[0]); + else + max = INT_MAX; + if(max <= 0 || max > config->new_max) + max = config->new_max; + tracks = trackdb_new(0, max); sink_printf(ev_writer_sink(c->w), "253 New track list follows\n"); + n = 0; while(*tracks) { sink_printf(ev_writer_sink(c->w), "%s%s\n", **tracks == '.' ? "." : "", *tracks); @@ -948,7 +1023,7 @@ static int c_new(struct conn *c, static int c_rtp_address(struct conn *c, char attribute((unused)) **vec, int attribute((unused)) nvec) { - if(config->speaker_backend == BACKEND_NETWORK) { + if(config->api == BACKEND_NETWORK) { sink_printf(ev_writer_sink(c->w), "252 %s %s\n", quoteutf8(config->broadcast.s[0]), quoteutf8(config->broadcast.s[1])); @@ -956,60 +1031,437 @@ static int c_rtp_address(struct conn *c, sink_writes(ev_writer_sink(c->w), "550 No RTP\n"); return 1; } - -#define C_AUTH 0001 /* must be authenticated */ -#define C_TRUSTED 0002 /* must be trusted user */ + +static int c_cookie(struct conn *c, + char **vec, + int attribute((unused)) nvec) { + const char *host; + char *user; + rights_type rights; + + /* Can't log in twice on the same connection */ + if(c->who) { + sink_writes(ev_writer_sink(c->w), "530 already authenticated\n"); + return 1; + } + /* Get some kind of peer identifcation */ + if(!(host = connection_host(c))) { + sink_writes(ev_writer_sink(c->w), "530 authentication failure\n"); + return 1; + } + /* Check the cookie */ + user = verify_cookie(vec[0], &rights); + if(!user) { + sink_writes(ev_writer_sink(c->w), "530 authentication failure\n"); + return 1; + } + /* Log in */ + c->who = user; + c->cookie = vec[0]; + c->rights = rights; + if(strcmp(host, "local")) + info("S%x %s connected with cookie from %s", c->tag, user, host); + else + c->rights |= RIGHT__LOCAL; + /* Response contains username so client knows who they are acting as */ + sink_printf(ev_writer_sink(c->w), "232 %s\n", quoteutf8(user)); + return 1; +} + +static int c_make_cookie(struct conn *c, + char attribute((unused)) **vec, + int attribute((unused)) nvec) { + const char *cookie = make_cookie(c->who); + + if(cookie) + sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(cookie)); + else + sink_writes(ev_writer_sink(c->w), "550 Cannot create cookie\n"); + return 1; +} + +static int c_revoke(struct conn *c, + char attribute((unused)) **vec, + int attribute((unused)) nvec) { + if(c->cookie) { + revoke_cookie(c->cookie); + sink_writes(ev_writer_sink(c->w), "250 OK\n"); + } else + sink_writes(ev_writer_sink(c->w), "550 Did not log in with cookie\n"); + return 1; +} + +static int c_adduser(struct conn *c, + char **vec, + int nvec) { + const char *rights; + + if(!config->remote_userman && !(c->rights & RIGHT__LOCAL)) { + error(0, "S%x: remote adduser", c->tag); + sink_writes(ev_writer_sink(c->w), "550 Remote user management is disabled\n"); + return 1; + } + if(nvec > 2) { + rights = vec[2]; + if(parse_rights(vec[2], 0, 1)) { + sink_writes(ev_writer_sink(c->w), "550 Invalid rights list\n"); + return -1; + } + } else + rights = config->default_rights; + if(trackdb_adduser(vec[0], vec[1], rights, + 0/*email*/, 0/*confirmation*/)) + sink_writes(ev_writer_sink(c->w), "550 Cannot create user\n"); + else + sink_writes(ev_writer_sink(c->w), "250 User created\n"); + return 1; +} + +static int c_deluser(struct conn *c, + char **vec, + int attribute((unused)) nvec) { + struct conn *d; + + if(!config->remote_userman && !(c->rights & RIGHT__LOCAL)) { + error(0, "S%x: remote deluser", c->tag); + sink_writes(ev_writer_sink(c->w), "550 Remote user management is disabled\n"); + return 1; + } + if(trackdb_deluser(vec[0])) { + sink_writes(ev_writer_sink(c->w), "550 Cannot delete user\n"); + return 1; + } + /* Zap connections belonging to deleted user */ + for(d = connections; d; d = d->next) + if(!strcmp(d->who, vec[0])) + d->rights = 0; + sink_writes(ev_writer_sink(c->w), "250 User deleted\n"); + return 1; +} + +static int c_edituser(struct conn *c, + char **vec, + int attribute((unused)) nvec) { + struct conn *d; + + if(!config->remote_userman && !(c->rights & RIGHT__LOCAL)) { + error(0, "S%x: remote edituser", c->tag); + sink_writes(ev_writer_sink(c->w), "550 Remote user management is disabled\n"); + return 1; + } + /* RIGHT_ADMIN can do anything; otherwise you can only set your own email + * address and password. */ + if((c->rights & RIGHT_ADMIN) + || (!strcmp(c->who, vec[0]) + && (!strcmp(vec[1], "email") + || !strcmp(vec[1], "password")))) { + if(trackdb_edituserinfo(vec[0], vec[1], vec[2])) { + sink_writes(ev_writer_sink(c->w), "550 Failed to change setting\n"); + return 1; + } + if(!strcmp(vec[1], "password")) { + /* Zap all connections for this user after a password change */ + for(d = connections; d; d = d->next) + if(!strcmp(d->who, vec[0])) + d->rights = 0; + } else if(!strcmp(vec[1], "rights")) { + /* Update rights for this user */ + rights_type r; + + if(parse_rights(vec[2], &r, 1)) + for(d = connections; d; d = d->next) + if(!strcmp(d->who, vec[0])) + d->rights = r; + } + sink_writes(ev_writer_sink(c->w), "250 OK\n"); + } else { + error(0, "%s attempted edituser but lacks required rights", c->who); + sink_writes(ev_writer_sink(c->w), "510 Restricted to administrators\n"); + } + return 1; +} + +static int c_userinfo(struct conn *c, + char attribute((unused)) **vec, + int attribute((unused)) nvec) { + struct kvp *k; + const char *value; + + /* We allow remote querying of rights so that clients can figure out what + * they're allowed to do */ + if(!config->remote_userman + && !(c->rights & RIGHT__LOCAL) + && strcmp(vec[1], "rights")) { + error(0, "S%x: remote userinfo %s %s", c->tag, vec[0], vec[1]); + sink_writes(ev_writer_sink(c->w), "550 Remote user management is disabled\n"); + return 1; + } + /* RIGHT_ADMIN allows anything; otherwise you can only get your own email + * address and rights list. */ + if((c->rights & RIGHT_ADMIN) + || (!strcmp(c->who, vec[0]) + && (!strcmp(vec[1], "email") + || !strcmp(vec[1], "rights")))) { + if((k = trackdb_getuserinfo(vec[0]))) + if((value = kvp_get(k, vec[1]))) + sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(value)); + else + sink_writes(ev_writer_sink(c->w), "555 Not set\n"); + else + sink_writes(ev_writer_sink(c->w), "550 No such user\n"); + } else { + error(0, "%s attempted userinfo but lacks required rights", c->who); + sink_writes(ev_writer_sink(c->w), "510 Restricted to administrators\n"); + } + return 1; +} + +static int c_users(struct conn *c, + char attribute((unused)) **vec, + int attribute((unused)) nvec) { + /* TODO de-dupe with c_tags */ + char **users = trackdb_listusers(); + + sink_writes(ev_writer_sink(c->w), "253 User list follows\n"); + while(*users) { + sink_printf(ev_writer_sink(c->w), "%s%s\n", + **users == '.' ? "." : "", *users); + ++users; + } + sink_writes(ev_writer_sink(c->w), ".\n"); + return 1; /* completed */ +} + +/** @brief Base64 mapping table for confirmation strings + * + * This is used with generic_to_base64() and generic_base64(). We cannot use + * the MIME table as that contains '+' and '=' which get quoted when + * URL-encoding. (The CGI still does the URL encoding but it is desirable to + * avoid it being necessary.) + */ +static const char confirm_base64_table[] = + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789/.*"; + +static int c_register(struct conn *c, + char **vec, + int attribute((unused)) nvec) { + char *buf, *cs; + size_t bufsize; + int offset; + + /* The confirmation string is base64(username;nonce) */ + bufsize = strlen(vec[0]) + CONFIRM_SIZE + 2; + buf = xmalloc_noptr(bufsize); + offset = byte_snprintf(buf, bufsize, "%s;", vec[0]); + gcry_randomize(buf + offset, CONFIRM_SIZE, GCRY_STRONG_RANDOM); + cs = generic_to_base64((uint8_t *)buf, offset + CONFIRM_SIZE, + confirm_base64_table); + if(trackdb_adduser(vec[0], vec[1], config->default_rights, vec[2], cs)) + sink_writes(ev_writer_sink(c->w), "550 Cannot create user\n"); + else + sink_printf(ev_writer_sink(c->w), "252 %s\n", quoteutf8(cs)); + return 1; +} + +static int c_confirm(struct conn *c, + char **vec, + int attribute((unused)) nvec) { + size_t nuser; + char *user, *sep; + rights_type rights; + const char *host; + + /* Get some kind of peer identifcation */ + if(!(host = connection_host(c))) { + sink_writes(ev_writer_sink(c->w), "530 Authentication failure\n"); + return 1; + } + if(!(user = generic_base64(vec[0], &nuser, confirm_base64_table)) + || !(sep = memchr(user, ';', nuser))) { + sink_writes(ev_writer_sink(c->w), "550 Malformed confirmation string\n"); + return 1; + } + *sep = 0; + if(trackdb_confirm(user, vec[0], &rights)) + sink_writes(ev_writer_sink(c->w), "550 Incorrect confirmation string\n"); + else { + c->who = user; + c->cookie = 0; + c->rights = rights; + if(strcmp(host, "local")) + info("S%x %s confirmed from %s", c->tag, user, host); + else + c->rights |= RIGHT__LOCAL; + /* Response contains username so client knows who they are acting as */ + sink_printf(ev_writer_sink(c->w), "232 %s\n", quoteutf8(user)); + } + return 1; +} + +static int sent_reminder(ev_source attribute((unused)) *ev, + pid_t attribute((unused)) pid, + int status, + const struct rusage attribute((unused)) *rusage, + void *u) { + struct conn *const c = u; + + /* Tell the client what went down */ + if(!status) { + sink_writes(ev_writer_sink(c->w), "250 OK\n"); + } else { + error(0, "reminder subprocess %s", wstat(status)); + sink_writes(ev_writer_sink(c->w), "550 Cannot send a reminder email\n"); + } + /* Re-enable this connection */ + ev_reader_enable(c->r); + return 0; +} + +static int c_reminder(struct conn *c, + char **vec, + int attribute((unused)) nvec) { + struct kvp *k; + const char *password, *email, *text, *encoding, *charset, *content_type; + const time_t *last; + time_t now; + pid_t pid; + + static hash *last_reminder; + + if(!config->mail_sender) { + error(0, "cannot send password reminders because mail_sender not set"); + sink_writes(ev_writer_sink(c->w), "550 Cannot send a reminder email\n"); + return 1; + } + if(!(k = trackdb_getuserinfo(vec[0]))) { + error(0, "reminder for user '%s' who does not exist", vec[0]); + sink_writes(ev_writer_sink(c->w), "550 Cannot send a reminder email\n"); + return 1; + } + if(!(email = kvp_get(k, "email")) + || !strchr(email, '@')) { + error(0, "user '%s' has no valid email address", vec[0]); + sink_writes(ev_writer_sink(c->w), "550 Cannot send a reminder email\n"); + return 1; + } + if(!(password = kvp_get(k, "password")) + || !*password) { + error(0, "user '%s' has no password", vec[0]); + sink_writes(ev_writer_sink(c->w), "550 Cannot send a reminder email\n"); + return 1; + } + /* Rate-limit reminders. This hash is bounded in size by the number of + * users. If this is actually a problem for anyone then we can periodically + * clean it. */ + if(!last_reminder) + last_reminder = hash_new(sizeof (time_t)); + last = hash_find(last_reminder, vec[0]); + time(&now); + if(last && now < *last + config->reminder_interval) { + error(0, "sent a password reminder to '%s' too recently", vec[0]); + sink_writes(ev_writer_sink(c->w), "550 Cannot send a reminder email\n"); + return 1; + } + /* Send the reminder */ + /* TODO this should be templatized and to some extent merged with + * the code in act_register() */ + byte_xasprintf((char **)&text, +"Someone requested that you be sent a reminder of your DisOrder password.\n" +"Your password is:\n" +"\n" +" %s\n", password); + if(!(text = mime_encode_text(text, &charset, &encoding))) + fatal(0, "cannot encode email"); + byte_xasprintf((char **)&content_type, "text/plain;charset=%s", + quote822(charset, 0)); + pid = sendmail_subprocess("", config->mail_sender, email, + "DisOrder password reminder", + encoding, content_type, text); + if(pid < 0) { + sink_writes(ev_writer_sink(c->w), "550 Cannot send a reminder email\n"); + return 1; + } + hash_add(last_reminder, vec[0], &now, HASH_INSERT_OR_REPLACE); + info("sending a passsword reminder to user '%s'", vec[0]); + /* We can only continue when the subprocess finishes */ + ev_child(c->ev, pid, 0, sent_reminder, c); + return 0; +} static const struct command { + /** @brief Command name */ const char *name; - int minargs, maxargs; + + /** @brief Minimum number of arguments */ + int minargs; + + /** @brief Maximum number of arguments */ + int maxargs; + + /** @brief Function to process command */ int (*fn)(struct conn *, char **, int); - unsigned flags; + + /** @brief Rights required to execute command + * + * 0 means that the command can be issued without logging in. If multiple + * bits are listed here any of those rights will do. + */ + rights_type rights; } commands[] = { - { "allfiles", 0, 2, c_allfiles, C_AUTH }, - { "become", 1, 1, c_become, C_AUTH|C_TRUSTED }, - { "dirs", 0, 2, c_dirs, C_AUTH }, - { "disable", 0, 1, c_disable, C_AUTH }, - { "enable", 0, 0, c_enable, C_AUTH }, - { "enabled", 0, 0, c_enabled, C_AUTH }, - { "exists", 1, 1, c_exists, C_AUTH }, - { "files", 0, 2, c_files, C_AUTH }, - { "get", 2, 2, c_get, C_AUTH }, - { "get-global", 1, 1, c_get_global, C_AUTH }, - { "length", 1, 1, c_length, C_AUTH }, - { "log", 0, 0, c_log, C_AUTH }, - { "move", 2, 2, c_move, C_AUTH }, - { "moveafter", 1, INT_MAX, c_moveafter, C_AUTH }, - { "new", 0, 1, c_new, C_AUTH }, - { "nop", 0, 0, c_nop, C_AUTH }, - { "part", 3, 3, c_part, C_AUTH }, - { "pause", 0, 0, c_pause, C_AUTH }, - { "play", 1, 1, c_play, C_AUTH }, - { "playing", 0, 0, c_playing, C_AUTH }, - { "prefs", 1, 1, c_prefs, C_AUTH }, - { "queue", 0, 0, c_queue, C_AUTH }, - { "random-disable", 0, 0, c_random_disable, C_AUTH }, - { "random-enable", 0, 0, c_random_enable, C_AUTH }, - { "random-enabled", 0, 0, c_random_enabled, C_AUTH }, - { "recent", 0, 0, c_recent, C_AUTH }, - { "reconfigure", 0, 0, c_reconfigure, C_AUTH|C_TRUSTED }, - { "remove", 1, 1, c_remove, C_AUTH }, - { "rescan", 0, 0, c_rescan, C_AUTH|C_TRUSTED }, - { "resolve", 1, 1, c_resolve, C_AUTH }, - { "resume", 0, 0, c_resume, C_AUTH }, - { "rtp-address", 0, 0, c_rtp_address, C_AUTH }, - { "scratch", 0, 1, c_scratch, C_AUTH }, - { "search", 1, 1, c_search, C_AUTH }, - { "set", 3, 3, c_set, C_AUTH, }, - { "set-global", 2, 2, c_set_global, C_AUTH }, - { "shutdown", 0, 0, c_shutdown, C_AUTH|C_TRUSTED }, - { "stats", 0, 0, c_stats, C_AUTH }, - { "tags", 0, 0, c_tags, C_AUTH }, - { "unset", 2, 2, c_set, C_AUTH }, - { "unset-global", 1, 1, c_set_global, C_AUTH }, + { "adduser", 2, 3, c_adduser, RIGHT_ADMIN|RIGHT__LOCAL }, + { "allfiles", 0, 2, c_allfiles, RIGHT_READ }, + { "confirm", 1, 1, c_confirm, 0 }, + { "cookie", 1, 1, c_cookie, 0 }, + { "deluser", 1, 1, c_deluser, RIGHT_ADMIN|RIGHT__LOCAL }, + { "dirs", 0, 2, c_dirs, RIGHT_READ }, + { "disable", 0, 1, c_disable, RIGHT_GLOBAL_PREFS }, + { "edituser", 3, 3, c_edituser, RIGHT_ADMIN|RIGHT_USERINFO }, + { "enable", 0, 0, c_enable, RIGHT_GLOBAL_PREFS }, + { "enabled", 0, 0, c_enabled, RIGHT_READ }, + { "exists", 1, 1, c_exists, RIGHT_READ }, + { "files", 0, 2, c_files, RIGHT_READ }, + { "get", 2, 2, c_get, RIGHT_READ }, + { "get-global", 1, 1, c_get_global, RIGHT_READ }, + { "length", 1, 1, c_length, RIGHT_READ }, + { "log", 0, 0, c_log, RIGHT_READ }, + { "make-cookie", 0, 0, c_make_cookie, RIGHT_READ }, + { "move", 2, 2, c_move, RIGHT_MOVE__MASK }, + { "moveafter", 1, INT_MAX, c_moveafter, RIGHT_MOVE__MASK }, + { "new", 0, 1, c_new, RIGHT_READ }, + { "nop", 0, 0, c_nop, 0 }, + { "part", 3, 3, c_part, RIGHT_READ }, + { "pause", 0, 0, c_pause, RIGHT_PAUSE }, + { "play", 1, 1, c_play, RIGHT_PLAY }, + { "playing", 0, 0, c_playing, RIGHT_READ }, + { "prefs", 1, 1, c_prefs, RIGHT_READ }, + { "queue", 0, 0, c_queue, RIGHT_READ }, + { "random-disable", 0, 0, c_random_disable, RIGHT_GLOBAL_PREFS }, + { "random-enable", 0, 0, c_random_enable, RIGHT_GLOBAL_PREFS }, + { "random-enabled", 0, 0, c_random_enabled, RIGHT_READ }, + { "recent", 0, 0, c_recent, RIGHT_READ }, + { "reconfigure", 0, 0, c_reconfigure, RIGHT_ADMIN }, + { "register", 3, 3, c_register, RIGHT_REGISTER|RIGHT__LOCAL }, + { "reminder", 1, 1, c_reminder, RIGHT__LOCAL }, + { "remove", 1, 1, c_remove, RIGHT_REMOVE__MASK }, + { "rescan", 0, 0, c_rescan, RIGHT_RESCAN }, + { "resolve", 1, 1, c_resolve, RIGHT_READ }, + { "resume", 0, 0, c_resume, RIGHT_PAUSE }, + { "revoke", 0, 0, c_revoke, RIGHT_READ }, + { "rtp-address", 0, 0, c_rtp_address, 0 }, + { "scratch", 0, 1, c_scratch, RIGHT_SCRATCH__MASK }, + { "search", 1, 1, c_search, RIGHT_READ }, + { "set", 3, 3, c_set, RIGHT_PREFS, }, + { "set-global", 2, 2, c_set_global, RIGHT_GLOBAL_PREFS }, + { "shutdown", 0, 0, c_shutdown, RIGHT_ADMIN }, + { "stats", 0, 0, c_stats, RIGHT_READ }, + { "tags", 0, 0, c_tags, RIGHT_READ }, + { "unset", 2, 2, c_set, RIGHT_PREFS }, + { "unset-global", 1, 1, c_set_global, RIGHT_GLOBAL_PREFS }, { "user", 2, 2, c_user, 0 }, - { "version", 0, 0, c_version, C_AUTH }, - { "volume", 0, 2, c_volume, C_AUTH } + { "userinfo", 2, 2, c_userinfo, RIGHT_READ }, + { "users", 0, 0, c_users, RIGHT_READ }, + { "version", 0, 0, c_version, RIGHT_READ }, + { "volume", 0, 2, c_volume, RIGHT_READ|RIGHT_VOLUME } }; static void command_error(const char *msg, void *u) { @@ -1024,6 +1476,11 @@ static int command(struct conn *c, char *line) { int nvec, n; D(("server command %s", line)); + /* We force everything into NFC as early as possible */ + if(!(line = utf8_compose_canon(line, strlen(line), 0))) { + sink_writes(ev_writer_sink(c->w), "500 cannot normalize command\n"); + return 1; + } if(!(vec = split(line, &nvec, SPLIT_QUOTES, command_error, c))) { sink_writes(ev_writer_sink(c->w), "500 cannot parse command\n"); return 1; @@ -1035,12 +1492,11 @@ static int command(struct conn *c, char *line) { if((n = TABLE_FIND(commands, struct command, name, vec[0])) < 0) sink_writes(ev_writer_sink(c->w), "500 unknown command\n"); else { - if((commands[n].flags & C_AUTH) && !c->who) { - sink_writes(ev_writer_sink(c->w), "530 not authenticated\n"); - return 1; - } - if((commands[n].flags & C_TRUSTED) && !trusted(c)) { - sink_writes(ev_writer_sink(c->w), "530 insufficient privilege\n"); + if(commands[n].rights + && !(c->rights & commands[n].rights)) { + error(0, "%s attempted %s but lacks required rights", c->who ? c->who : "NULL", + commands[n].name); + sink_writes(ev_writer_sink(c->w), "510 Prohibited\n"); return 1; } ++vec; @@ -1061,20 +1517,18 @@ static int command(struct conn *c, char *line) { /* redirect to the right reader callback for our current state */ static int redirect_reader_callback(ev_source *ev, ev_reader *reader, - int fd, void *ptr, size_t bytes, int eof, void *u) { struct conn *c = u; - return c->reader(ev, reader, fd, ptr, bytes, eof, u); + return c->reader(ev, reader, ptr, bytes, eof, u); } /* the main command reader */ static int reader_callback(ev_source attribute((unused)) *ev, ev_reader *reader, - int attribute((unused)) fd, void *ptr, size_t bytes, int eof, @@ -1104,8 +1558,14 @@ static int reader_callback(ev_source attribute((unused)) *ev, if(eof) { if(bytes) error(0, "S%x unterminated line", c->tag); + D(("normal reader close")); c->r = 0; - return ev_writer_close(c->w); + if(c->w) { + D(("close associated writer")); + ev_writer_close(c->w); + c->w = 0; + } + remove_connection(c); } return 0; } @@ -1128,19 +1588,16 @@ static int listen_callback(ev_source *ev, "client writer"); c->r = ev_reader_new(ev, fd, redirect_reader_callback, reader_error, c, "client reader"); + ev_tie(c->r, c->w); c->fd = fd; c->reader = reader_callback; c->l = l; + c->rights = 0; gcry_randomize(c->nonce, sizeof c->nonce, GCRY_STRONG_RANDOM); - if(!strcmp(config->authorization_algorithm, "sha1") - || !strcmp(config->authorization_algorithm, "SHA1")) { - sink_printf(ev_writer_sink(c->w), "231 %s\n", - hex(c->nonce, sizeof c->nonce)); - } else { - sink_printf(ev_writer_sink(c->w), "231 %s %s\n", - config->authorization_algorithm, - hex(c->nonce, sizeof c->nonce)); - } + sink_printf(ev_writer_sink(c->w), "231 %d %s %s\n", + 2, + config->authorization_algorithm, + hex(c->nonce, sizeof c->nonce)); return 0; }