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|
/* $OpenBSD: smtpd.h,v 1.4 2008/11/10 17:24:24 deraadt Exp $ */
/*
* Copyright (c) 2008 Gilles Chehade <gilles@openbsd.org>
* Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#define CONF_FILE "/etc/mail/smtpd.conf"
#define MAX_LISTEN 16
#define STRLEN 1024
#define PROC_COUNT 8
#define READ_BUF_SIZE 32768
#define MAX_NAME_SIZE 64
/* sizes include the tailing '\0' */
#define MAX_LOCALPART_SIZE 65
#define MAX_DOMAINPART_SIZE MAXHOSTNAMELEN
/* return and forward path size */
#define MAX_PATH_SIZE 256
/*#define SMTPD_CONNECT_TIMEOUT (60)*/
#define SMTPD_CONNECT_TIMEOUT (10)
#define SMTPD_QUEUE_INTERVAL (15 * 60)
#define SMTPD_QUEUE_MAXINTERVAL (4 * 60 * 60)
#define SMTPD_QUEUE_EXPIRY (4 * 24 * 60 * 60)
#define SMTPD_USER "_smtpd"
#define SMTPD_SOCKET "/var/run/smtpd.sock"
#define SMTPD_BANNER "220 %s OpenSMTPD\r\n"
#define SMTPD_SESSION_TIMEOUT 300
#define RCPTBUFSZ 256
#define PATH_SPOOL "/var/spool/smtpd"
#define PATH_MESSAGES "/messages"
#define PATH_LOCAL "/local"
#define PATH_RELAY "/relay"
#define PATH_DAEMON "/daemon"
#define PATH_ENVELOPES "/envelopes"
/* used by newaliases */
#define PATH_ALIASES "/etc/mail/aliases"
#define PATH_ALIASESDB "/etc/mail/aliases.db"
/* number of MX records to lookup */
#define MXARRAYSIZE 5
struct address {
char hostname[MAXHOSTNAMELEN];
u_int16_t port;
};
struct netaddr {
struct sockaddr_storage ss;
int masked;
};
/* buffer specific headers */
struct buf {
TAILQ_ENTRY(buf) entry;
u_char *buf;
size_t size;
size_t max;
size_t wpos;
size_t rpos;
int fd;
};
struct msgbuf {
TAILQ_HEAD(, buf) bufs;
u_int32_t queued;
int fd;
};
struct buf_read {
u_char buf[READ_BUF_SIZE];
u_char *rptr;
size_t wpos;
};
struct imsg_fd {
TAILQ_ENTRY(imsg_fd) entry;
int fd;
u_int32_t id;
};
struct imsgbuf {
TAILQ_HEAD(, imsg_fd) fds;
struct buf_read r;
struct msgbuf w;
struct event ev;
void (*handler)(int, short, void *);
int fd;
pid_t pid;
short events;
void *data;
u_int32_t id;
};
struct imsg_hdr {
u_int16_t type;
u_int16_t len;
u_int32_t peerid;
pid_t pid;
};
struct imsg {
struct imsg_hdr hdr;
u_int32_t id;
void *data;
};
enum imsg_type {
IMSG_NONE,
IMSG_CTL_OK, /* answer to smtpctl requests */
IMSG_CTL_FAIL,
IMSG_CTL_SHUTDOWN,
IMSG_CONF_START,
IMSG_CONF_SSL,
IMSG_CONF_SSL_CERT,
IMSG_CONF_SSL_KEY,
IMSG_CONF_LISTENER,
IMSG_CONF_MAP,
IMSG_CONF_RULE,
IMSG_CONF_CONDITION,
IMSG_CONF_OPTION,
IMSG_CONF_END,
IMSG_CONF_RELOAD,
IMSG_LKA_LOOKUP_MAIL,
IMSG_LKA_LOOKUP_RCPT,
IMSG_LKA_ALIAS_LOOKUP,
IMSG_LKA_VUSER_LOOKUP,
IMSG_LKA_ALIAS_RESULT,
IMSG_LKA_VUSER_RESULT,
IMSG_LKA_ALIAS_RESULT_ACK,
IMSG_LKA_ALIAS_SCHEDULE,
IMSG_LKA_ALIAS_END,
IMSG_LKA_NO_ALIAS,
IMSG_LKA_MX_LOOKUP,
IMSG_LKA_FORWARD_LOOKUP,
IMSG_LKA_HOSTNAME_LOOKUP,
IMSG_MDA_MAILBOX_FILE,
IMSG_MDA_MESSAGE_FILE,
IMSG_MDA_MAILBOX_FILE_ERROR,
IMSG_MDA_MESSAGE_FILE_ERROR,
IMSG_MFA_RPATH_SUBMIT,
IMSG_MFA_RCPT_SUBMIT,
IMSG_MFA_DATA_SUBMIT,
IMSG_MFA_LOOKUP_MAIL,
IMSG_MFA_LOOKUP_RCPT,
IMSG_QUEUE_REMOVE_SUBMISSION,
IMSG_QUEUE_CREATE_MESSAGE_FILE,
IMSG_QUEUE_DELETE_MESSAGE_FILE,
IMSG_QUEUE_MESSAGE_SUBMIT,
IMSG_QUEUE_MESSAGE_UPDATE,
IMSG_QUEUE_BATCH_COMPLETE,
IMSG_QUEUE_BATCH_CLOSE,
IMSG_QUEUE_MESSAGE_FD,
IMSG_QUEUE_ACCEPTED_CLOSE,
IMSG_QUEUE_RETRY_CLOSE,
IMSG_QUEUE_REJECTED_CLOSE,
IMSG_QUEUE_RECIPIENT_ACCEPTED,
IMSG_QUEUE_RECIPIENT_UPDATED,
IMSG_CREATE_BATCH,
IMSG_BATCH_APPEND,
IMSG_BATCH_CLOSE,
IMSG_SMTP_MESSAGE_FILE,
IMSG_SMTP_SUBMIT_ACK,
IMSG_SMTP_HOSTNAME_ANSWER,
IMSG_PARENT_MAILBOX_OPEN,
IMSG_PARENT_MESSAGE_OPEN,
IMSG_PARENT_MAILBOX_RENAME,
IMSG_PARENT_AUTHENTICATE
};
#define IMSG_HEADER_SIZE sizeof(struct imsg_hdr)
#define MAX_IMSGSIZE 16384
enum blockmodes {
BM_NORMAL,
BM_NONBLOCK
};
struct ctl_conn {
TAILQ_ENTRY(ctl_conn) entry;
u_int8_t flags;
#define CTL_CONN_NOTIFY 0x01
struct imsgbuf ibuf;
};
TAILQ_HEAD(ctl_connlist, ctl_conn);
typedef u_int32_t objid_t;
struct ctl_id {
objid_t id;
char name[MAX_NAME_SIZE];
};
enum smtp_proc_type {
PROC_PARENT = 0,
PROC_SMTP,
PROC_MFA,
PROC_LKA,
PROC_QUEUE,
PROC_MDA,
PROC_MTA,
PROC_CONTROL,
} smtpd_process;
struct peer {
enum smtp_proc_type id;
void (*cb)(int, short, void *);
};
enum map_type {
T_SINGLE,
T_LIST,
T_HASH
};
enum map_src {
S_NONE,
S_DYN,
S_DNS,
S_FILE,
S_DB,
S_EXT
};
enum mapel_type {
ME_STRING,
ME_NET,
ME_NETMASK
};
struct mapel {
TAILQ_ENTRY(mapel) me_entry;
union mapel_data {
char med_string[STRLEN];
struct netaddr med_addr;
} me_key;
union mapel_data me_val;
};
struct map {
TAILQ_ENTRY(map) m_entry;
#define F_USED 0x01
#define F_DYNAMIC 0x02
u_int8_t m_flags;
char m_name[STRLEN];
objid_t m_id;
enum map_type m_type;
enum mapel_type m_eltype;
enum map_src m_src;
char m_config[MAXPATHLEN];
TAILQ_HEAD(mapel_list, mapel) m_contents;
};
enum cond_type {
C_ALL,
C_NET,
C_DOM
};
struct cond {
TAILQ_ENTRY(cond) c_entry;
objid_t c_map;
enum cond_type c_type;
struct map *c_match;
};
enum opt_type {
O_RWUSER, /* rewrite user */
O_RWDOMAIN, /* rewrite domain */
};
struct opt {
TAILQ_ENTRY(opt) o_entry;
enum opt_type o_type;
};
enum action_type {
A_RELAY,
A_RELAYVIA,
A_MAILDIR,
A_MBOX,
A_FILENAME,
A_EXT
};
#define IS_MAILBOX(x) ((x) == A_MAILDIR || (x) == A_MBOX || (x) == A_FILENAME)
#define IS_RELAY(x) ((x) == A_RELAY || (x) == A_RELAYVIA)
#define IS_EXT(x) ((x) == A_EXT)
struct rule {
TAILQ_ENTRY(rule) r_entry;
int r_accept;
struct map *r_sources;
TAILQ_HEAD(condlist, cond) r_conditions;
enum action_type r_action;
union {
char path[MAXPATHLEN];
struct address host;
#define MAXCOMMANDLEN 256
char command[MAXCOMMANDLEN];
} r_value;
TAILQ_HEAD(optlist, opt) r_options;
};
enum path_flags {
F_ALIAS = 0x1,
F_VIRTUAL = 0x2,
F_EXPANDED = 0x4,
F_NOFORWARD = 0x8,
F_FORWARDED = 0x10
};
struct path {
TAILQ_ENTRY(path) entry;
struct rule rule;
enum path_flags flags;
u_int8_t forwardcnt;
char user[MAX_LOCALPART_SIZE];
char domain[MAX_DOMAINPART_SIZE];
char pw_name[MAXLOGNAME];
union {
char filename[MAXPATHLEN];
char filter[MAXPATHLEN];
} u;
};
enum alias_type {
ALIAS_USERNAME,
ALIAS_FILENAME,
ALIAS_FILTER,
ALIAS_INCLUDE,
ALIAS_ADDRESS
};
struct alias {
TAILQ_ENTRY(alias) entry;
enum alias_type type;
union {
char username[MAXLOGNAME];
char filename[MAXPATHLEN];
char filter[MAXPATHLEN];
struct path path;
} u;
};
TAILQ_HEAD(aliaseslist, alias);
struct submit_status {
u_int64_t id;
int code;
union {
struct path path;
char msgid[MAXPATHLEN];
char errormsg[STRLEN];
} u;
struct sockaddr_storage ss;
};
struct message_recipient {
u_int64_t id;
struct sockaddr_storage ss;
struct path path;
};
enum message_type {
T_MDA_MESSAGE = 0x1,
T_MTA_MESSAGE = 0x2,
T_DAEMON_MESSAGE = 0x4
};
enum message_status {
S_MESSAGE_PERMFAILURE = 0x1,
S_MESSAGE_TEMPFAILURE = 0x2,
S_MESSAGE_REJECTED = 0x4,
S_MESSAGE_ACCEPTED = 0x8,
S_MESSAGE_RETRY = 0x10,
S_MESSAGE_EDNS = 0x20,
S_MESSAGE_ECONNECT = 0x40
};
enum message_flags {
F_MESSAGE_COMPLETE = 0x1,
F_MESSAGE_RESOLVED = 0x2,
F_MESSAGE_READY = 0x4,
F_MESSAGE_EXPIRED = 0x8,
F_MESSAGE_PROCESSING = 0x10
};
struct message {
SPLAY_ENTRY(message) nodes;
TAILQ_ENTRY(message) entry;
enum message_type type;
u_int64_t id;
u_int64_t session_id;
u_int64_t batch_id;
char message_id[MAXPATHLEN];
char message_uid[MAXPATHLEN];
char session_helo[MAXHOSTNAMELEN];
char session_hostname[MAXHOSTNAMELEN];
char session_errorline[STRLEN];
struct sockaddr_storage session_ss;
struct path sender;
struct path recipient;
TAILQ_HEAD(pathlist,path) recipients;
u_int16_t rcptcount;
time_t creation;
time_t lasttry;
u_int8_t retry;
enum message_flags flags;
enum message_status status;
FILE *datafp;
int mboxfd;
int messagefd;
};
enum batch_status {
S_BATCH_PERMFAILURE = 0x1,
S_BATCH_TEMPFAILURE = 0x2,
S_BATCH_REJECTED = 0x4,
S_BATCH_ACCEPTED = 0x8,
S_BATCH_RETRY = 0x10,
S_BATCH_EDNS = 0x20,
S_BATCH_ECONNECT = 0x40
};
enum batch_type {
T_MDA_BATCH = 0x1,
T_MTA_BATCH = 0x2,
T_DAEMON_BATCH = 0x4
};
enum batch_flags {
F_BATCH_COMPLETE = 0x1,
F_BATCH_RESOLVED = 0x2,
F_BATCH_SCHEDULED = 0x4,
F_BATCH_EXPIRED = 0x8,
};
struct mdaproc {
SPLAY_ENTRY(mdaproc) mdaproc_nodes;
pid_t pid;
};
struct batch {
SPLAY_ENTRY(batch) b_nodes;
u_int64_t id;
enum batch_type type;
enum batch_flags flags;
struct rule rule;
struct event ev;
struct timeval tv;
int peerfd;
struct bufferevent *bev;
u_int8_t state;
struct smtpd *env;
char message_id[MAXPATHLEN];
char hostname[MAXHOSTNAMELEN];
char errorline[STRLEN];
u_int8_t h_errno;
struct sockaddr_storage ss[MXARRAYSIZE*2];
u_int8_t ss_cnt;
u_int8_t ss_off;
time_t creation;
time_t lasttry;
u_int8_t retry;
struct message message;
struct message *messagep;
FILE *messagefp;
TAILQ_HEAD(messagelist, message) messages;
enum batch_status status;
};
enum session_state {
S_INIT = 0,
S_GREETED,
S_TLS,
S_AUTH,
S_HELO,
S_MAIL,
S_RCPT,
S_DATA,
S_DATACONTENT,
S_DONE,
S_QUIT
};
struct ssl {
SPLAY_ENTRY(ssl) ssl_nodes;
char ssl_name[PATH_MAX];
char *ssl_cert;
off_t ssl_cert_len;
char *ssl_key;
off_t ssl_key_len;
};
struct listener {
#define F_STARTTLS 0x01
#define F_SSMTP 0x02
#define F_SSL (F_SSMTP|F_STARTTLS)
u_int8_t flags;
int fd;
struct sockaddr_storage ss;
in_port_t port;
int backlog;
struct timeval timeout;
struct event ev;
struct smtpd *env;
char ssl_cert_name[PATH_MAX];
struct ssl *ssl;
void *ssl_ctx;
TAILQ_ENTRY(listener) entry;
};
struct session_auth_req {
u_int64_t session_id;
char buffer[STRLEN];
};
struct session_auth_reply {
u_int64_t session_id;
u_int8_t value;
};
enum session_flags {
F_QUIT = 0x1,
F_IMSG_SENT = 0x2,
F_8BITMIME = 0x4,
F_SECURE = 0x8,
F_AUTHENTICATED = 0x10
};
struct session {
SPLAY_ENTRY(session) s_nodes;
u_int64_t s_id;
enum session_flags s_flags;
enum session_state s_state;
time_t s_tm;
int s_fd;
struct sockaddr_storage s_ss;
char s_hostname[MAXHOSTNAMELEN];
struct event s_ev;
struct bufferevent *s_bev;
struct listener *s_l;
struct smtpd *s_env;
void *s_ssl;
u_char *s_buf;
int s_buflen;
struct timeval s_tv;
struct message s_msg;
};
struct smtpd {
#define SMTPD_OPT_VERBOSE 0x00000001
#define SMTPD_OPT_NOACTION 0x00000002
u_int32_t sc_opts;
#define SMTPD_CONFIGURING 0x00000001
#define SMTPD_EXITING 0x00000002
u_int32_t sc_flags;
struct timeval sc_qintval;
struct event sc_ev;
int sc_pipes[PROC_COUNT]
[PROC_COUNT][2];
struct imsgbuf *sc_ibufs[PROC_COUNT];
struct passwd *sc_pw;
char sc_hostname[MAXHOSTNAMELEN];
TAILQ_HEAD(listenerlist, listener) sc_listeners;
TAILQ_HEAD(maplist, map) *sc_maps;
TAILQ_HEAD(rulelist, rule) *sc_rules;
SPLAY_HEAD(sessiontree, session) sc_sessions;
SPLAY_HEAD(msgtree, message) sc_messages;
SPLAY_HEAD(ssltree, ssl) sc_ssl;
SPLAY_HEAD(batchtree, batch) batch_queue;
SPLAY_HEAD(mdaproctree, mdaproc) mdaproc_queue;
};
/* aliases.c */
int is_alias(struct path *);
/* atomic.c */
ssize_t atomic_read(int, void *, size_t);
ssize_t atomic_write(int, const void *, size_t);
ssize_t atomic_printfd(int, const char *, ...);
/* log.c */
void log_init(int);
void log_warn(const char *, ...);
void log_warnx(const char *, ...);
void log_info(const char *, ...);
void log_debug(const char *, ...);
__dead void fatal(const char *);
__dead void fatalx(const char *);
/* buffer.c */
struct buf *buf_open(size_t);
struct buf *buf_dynamic(size_t, size_t);
int buf_add(struct buf *, void *, size_t);
void *buf_reserve(struct buf *, size_t);
int buf_close(struct msgbuf *, struct buf *);
void buf_free(struct buf *);
void msgbuf_init(struct msgbuf *);
void msgbuf_clear(struct msgbuf *);
int msgbuf_write(struct msgbuf *);
/* imsg.c */
void imsg_init(struct imsgbuf *, int, void (*)(int, short, void *));
ssize_t imsg_read(struct imsgbuf *);
ssize_t imsg_get(struct imsgbuf *, struct imsg *);
int imsg_compose(struct imsgbuf *, enum imsg_type, u_int32_t, pid_t,
int, void *, u_int16_t);
int imsg_composev(struct imsgbuf *, enum imsg_type, u_int32_t,
pid_t, int, const struct iovec *, int);
int imsg_compose_fds(struct imsgbuf *, enum imsg_type, u_int32_t, pid_t,
void *, u_int16_t, int, ...);
struct buf *imsg_create(struct imsgbuf *, enum imsg_type, u_int32_t, pid_t,
u_int16_t);
int imsg_add(struct buf *, void *, u_int16_t);
int imsg_append(struct imsgbuf *, struct buf *);
int imsg_close(struct imsgbuf *, struct buf *);
void imsg_free(struct imsg *);
void imsg_event_add(struct imsgbuf *); /* needs to be provided externally */
int imsg_get_fd(struct imsgbuf *, struct imsg *);
int imsg_flush(struct imsgbuf *);
void imsg_clear(struct imsgbuf *);
/* lka.c */
pid_t lka(struct smtpd *);
/* mfa.c */
pid_t mfa(struct smtpd *);
int msg_cmp(struct message *, struct message *);
SPLAY_PROTOTYPE(msgtree, message, nodes, msg_cmp);
/* queue.c */
pid_t queue(struct smtpd *);
u_int64_t queue_generate_id(void);
int batch_cmp(struct batch *, struct batch *);
struct batch *batch_by_id(struct smtpd *, u_int64_t);
struct message *message_by_id(struct smtpd *, struct batch *, u_int64_t);
int queue_remove_batch_message(struct smtpd *, struct batch *, struct message *);
SPLAY_PROTOTYPE(batchtree, batch, b_nodes, batch_cmp);
/* mda.c */
pid_t mda(struct smtpd *);
int mdaproc_cmp(struct mdaproc *, struct mdaproc *);
SPLAY_PROTOTYPE(mdaproctree, mdaproc, mdaproc_nodes, mdaproc_cmp);
/* mta.c */
pid_t mta(struct smtpd *);
/* control.c */
pid_t control(struct smtpd *);
void session_socket_blockmode(int, enum blockmodes);
/* smtp.c */
pid_t smtp(struct smtpd *);
void smtp_listener_setup(struct smtpd *, struct listener *);
/* smtp_session.c */
void session_init(struct listener *, struct session *);
void session_read(struct bufferevent *, void *);
void session_write(struct bufferevent *, void *);
void session_error(struct bufferevent *, short, void *);
int session_cmp(struct session *, struct session *);
void session_msg_submit(struct session *);
void session_pickup(struct session *, struct submit_status *);
void session_destroy(struct session *);
SPLAY_PROTOTYPE(sessiontree, session, s_nodes, session_cmp);
/* store.c */
int store_write_header(struct batch *, struct message *);
int store_write_message(struct batch *, struct message *);
int store_write_daemon(struct batch *, struct message *);
int store_message(struct batch *, struct message *,
int (*)(struct batch *, struct message *));
/* config.c */
#define PURGE_LISTENERS 0x01
#define PURGE_MAPS 0x02
#define PURGE_RULES 0x04
#define PURGE_SSL 0x08
#define PURGE_EVERYTHING 0xff
void purge_config(struct smtpd *, u_int8_t);
void unconfigure(struct smtpd *);
void configure(struct smtpd *);
void init_peers(struct smtpd *);
void config_peers(struct smtpd *, struct peer *, u_int);
/* parse.y */
int parse_config(struct smtpd *, const char *, int);
int cmdline_symset(char *);
/* ssl.c */
void ssl_init(void);
void ssl_transaction(struct session *);
void ssl_session_init(struct session *);
void ssl_session_destroy(struct session *);
int ssl_load_certfile(struct smtpd *, const char *);
void ssl_setup(struct smtpd *, struct listener *);
int ssl_cmp(struct ssl *, struct ssl *);
SPLAY_PROTOTYPE(ssltree, ssl, ssl_nodes, ssl_cmp);
/* ssl_privsep.c */
int ssl_ctx_use_private_key(void *, char *, off_t);
int ssl_ctx_use_certificate_chain(void *, char *, off_t);
/* smtpd.c */
struct map *map_find(struct smtpd *, objid_t);
struct map *map_findbyname(struct smtpd *, const char *);
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