imap.c
上传用户:xxcykj
上传日期:2007-01-04
资源大小:727k
文件大小:38k
- /*
- * imap.c -- IMAP2bis/IMAP4 protocol methods
- *
- * Copyright 1997 by Eric S. Raymond
- * For license terms, see the file COPYING in this directory.
- */
- #include "config.h"
- #include <stdio.h>
- #include <string.h>
- #include <ctype.h>
- #if defined(STDC_HEADERS)
- #include <stdlib.h>
- #endif
- #include "fetchmail.h"
- #include "socket.h"
- #ifdef KERBEROS_V4
- #ifdef KERBEROS_V5
- #include <kerberosIV/des.h>
- #include <kerberosIV/krb.h>
- #else
- #if defined (__bsdi__)
- #include <des.h>
- #define krb_get_err_text(e) (krb_err_txt[e])
- #endif
- #if defined(__NetBSD__) || (__FreeBSD__) || defined(__linux__)
- #define krb_get_err_text(e) (krb_err_txt[e])
- #endif
- #include <krb.h>
- #endif
- #endif /* KERBEROS_V4 */
- #include "i18n.h"
- #ifdef GSSAPI
- #ifdef HAVE_GSSAPI_H
- #include <gssapi.h>
- #endif
- #ifdef HAVE_GSSAPI_GSSAPI_H
- #include <gssapi/gssapi.h>
- #endif
- #ifdef HAVE_GSSAPI_GSSAPI_GENERIC_H
- #include <gssapi/gssapi_generic.h>
- #endif
- #ifndef HAVE_GSS_C_NT_HOSTBASED_SERVICE
- #define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
- #endif
- #endif
- #include "md5.h"
- #if OPIE_ENABLE
- #include <opie.h>
- #endif /* OPIE_ENABLE */
- #ifndef strstr /* glibc-2.1 declares this as a macro */
- extern char *strstr(); /* needed on sysV68 R3V7.1. */
- #endif /* strstr */
- /* imap_version values */
- #define IMAP2 -1 /* IMAP2 or IMAP2BIS, RFC1176 */
- #define IMAP4 0 /* IMAP4 rev 0, RFC1730 */
- #define IMAP4rev1 1 /* IMAP4 rev 1, RFC2060 */
- static int count, seen, recent, unseen, deletions, imap_version, preauth;
- static int expunged, expunge_period;
- static char capabilities[MSGBUFSIZE+1];
- int imap_ok(int sock, char *argbuf)
- /* parse command response */
- {
- char buf [MSGBUFSIZE+1];
- seen = 0;
- do {
- int ok;
- char *cp;
- if ((ok = gen_recv(sock, buf, sizeof(buf))))
- return(ok);
- /* all tokens in responses are caseblind */
- for (cp = buf; *cp; cp++)
- if (islower(*cp))
- *cp = toupper(*cp);
- /* interpret untagged status responses */
- if (strstr(buf, "* CAPABILITY"))
- strncpy(capabilities, buf + 12, sizeof(capabilities));
- if (strstr(buf, "EXISTS"))
- count = atoi(buf+2);
- if (strstr(buf, "RECENT"))
- recent = atoi(buf+2);
- if (strstr(buf, "UNSEEN"))
- {
- char *cp;
- /*
- * Handle both "* 42 UNSEEN" (if tha ever happens) and
- * "* OK [UNSEEN 42] 42". Note that what this gets us is
- * a minimum index, not a count.
- */
- unseen = 0;
- for (cp = buf; *cp && !isdigit(*cp); cp++)
- continue;
- unseen = atoi(cp);
- }
- if (strstr(buf, "FLAGS"))
- seen = (strstr(buf, "SEEN") != (char *)NULL);
- if (strstr(buf, "PREAUTH"))
- preauth = TRUE;
- } while
- (tag[0] != ' ' && strncmp(buf, tag, strlen(tag)));
- if (tag[0] == ' ')
- {
- if (argbuf)
- strcpy(argbuf, buf);
- return(PS_SUCCESS);
- }
- else
- {
- char *cp;
- /* skip the tag */
- for (cp = buf; !isspace(*cp); cp++)
- continue;
- while (isspace(*cp))
- cp++;
- if (strncmp(cp, "PREAUTH", 2) == 0)
- {
- if (argbuf)
- strcpy(argbuf, cp);
- preauth = TRUE;
- return(PS_SUCCESS);
- }
- else if (strncmp(cp, "OK", 2) == 0)
- {
- if (argbuf)
- strcpy(argbuf, cp);
- return(PS_SUCCESS);
- }
- else if (strncmp(cp, "BAD", 3) == 0)
- return(PS_ERROR);
- else if (strncmp(cp, "NO", 2) == 0)
- {
- if (stage == STAGE_GETAUTH)
- return(PS_AUTHFAIL); /* RFC2060, 6.2.2 */
- else
- return(PS_ERROR);
- }
- else
- return(PS_PROTOCOL);
- }
- }
- #if OPIE_ENABLE
- static int do_otp(int sock, struct query *ctl)
- {
- int i, rval;
- char buffer[128];
- char challenge[OPIE_CHALLENGE_MAX+1];
- char response[OPIE_RESPONSE_MAX+1];
- gen_send(sock, "AUTHENTICATE X-OTP");
- if (rval = gen_recv(sock, buffer, sizeof(buffer)))
- return rval;
- if ((i = from64tobits(challenge, buffer)) < 0) {
- report(stderr, _("Could not decode initial BASE64 challengen"));
- return PS_AUTHFAIL;
- };
- to64frombits(buffer, ctl->remotename, strlen(ctl->remotename));
- if (outlevel >= O_MONITOR)
- report(stdout, "IMAP> %sn", buffer);
- /* best not to count on the challenge code handling multiple writes */
- strcat(buffer, "rn");
- SockWrite(sock, buffer, strlen(buffer));
- if (rval = gen_recv(sock, buffer, sizeof(buffer)))
- return rval;
- if ((i = from64tobits(challenge, buffer)) < 0) {
- report(stderr, _("Could not decode OTP challengen"));
- return PS_AUTHFAIL;
- };
- rval = opiegenerator(challenge, !strcmp(ctl->password, "opie") ? "" : ctl->password, response);
- if ((rval == -2) && !run.poll_interval) {
- char secret[OPIE_SECRET_MAX+1];
- fprintf(stderr, _("Secret pass phrase: "));
- if (opiereadpass(secret, sizeof(secret), 0))
- rval = opiegenerator(challenge, secret, response);
- memset(secret, 0, sizeof(secret));
- };
- if (rval)
- return(PS_AUTHFAIL);
- to64frombits(buffer, response, strlen(response));
- if (outlevel >= O_MONITOR)
- report(stdout, "IMAP> %sn", buffer);
- strcat(buffer, "rn");
- SockWrite(sock, buffer, strlen(buffer));
- if (rval = gen_recv(sock, buffer, sizeof(buffer)))
- return rval;
- if (strstr(buffer, "OK"))
- return PS_SUCCESS;
- else
- return PS_AUTHFAIL;
- };
- #endif /* OPIE_ENABLE */
- #ifdef KERBEROS_V4
- #if SIZEOF_INT == 4
- typedef int int32;
- #elif SIZEOF_SHORT == 4
- typedef short int32;
- #elif SIZEOF_LONG == 4
- typedef long int32;
- #else
- #error Cannot deduce a 32-bit-type
- #endif
- static int do_rfc1731(int sock, char *truename)
- /* authenticate as per RFC1731 -- note 32-bit integer requirement here */
- {
- int result = 0, len;
- char buf1[4096], buf2[4096];
- union {
- int32 cint;
- char cstr[4];
- } challenge1, challenge2;
- char srvinst[INST_SZ];
- char *p;
- char srvrealm[REALM_SZ];
- KTEXT_ST authenticator;
- CREDENTIALS credentials;
- char tktuser[MAX_K_NAME_SZ+1+INST_SZ+1+REALM_SZ+1];
- char tktinst[INST_SZ];
- char tktrealm[REALM_SZ];
- des_cblock session;
- des_key_schedule schedule;
- gen_send(sock, "AUTHENTICATE KERBEROS_V4");
- /* The data encoded in the first ready response contains a random
- * 32-bit number in network byte order. The client should respond
- * with a Kerberos ticket and an authenticator for the principal
- * "imap.hostname@realm", where "hostname" is the first component
- * of the host name of the server with all letters in lower case
- * and where "realm" is the Kerberos realm of the server. The
- * encrypted checksum field included within the Kerberos
- * authenticator should contain the server provided 32-bit number
- * in network byte order.
- */
- if (result = gen_recv(sock, buf1, sizeof buf1)) {
- return result;
- }
- len = from64tobits(challenge1.cstr, buf1);
- if (len < 0) {
- report(stderr, _("could not decode initial BASE64 challengen"));
- return PS_AUTHFAIL;
- }
- /* this patch by Dan Root <dar@thekeep.org> solves an endianess
- * problem. */
- {
- char tmp[4];
- *(int *)tmp = ntohl(*(int *) challenge1.cstr);
- memcpy(challenge1.cstr, tmp, sizeof(tmp));
- }
- /* Client responds with a Kerberos ticket and an authenticator for
- * the principal "imap.hostname@realm" where "hostname" is the
- * first component of the host name of the server with all letters
- * in lower case and where "realm" is the Kerberos realm of the
- * server. The encrypted checksum field included within the
- * Kerberos authenticator should contain the server-provided
- * 32-bit number in network byte order.
- */
- strncpy(srvinst, truename, (sizeof srvinst)-1);
- srvinst[(sizeof srvinst)-1] = ' ';
- for (p = srvinst; *p; p++) {
- if (isupper(*p)) {
- *p = tolower(*p);
- }
- }
- strncpy(srvrealm, (char *)krb_realmofhost(srvinst), (sizeof srvrealm)-1);
- srvrealm[(sizeof srvrealm)-1] = ' ';
- if (p = strchr(srvinst, '.')) {
- *p = ' ';
- }
- result = krb_mk_req(&authenticator, "imap", srvinst, srvrealm, 0);
- if (result) {
- report(stderr, "krb_mq_req: %sn", krb_get_err_text(result));
- return PS_AUTHFAIL;
- }
- result = krb_get_cred("imap", srvinst, srvrealm, &credentials);
- if (result) {
- report(stderr, "krb_get_cred: %sn", krb_get_err_text(result));
- return PS_AUTHFAIL;
- }
- memcpy(session, credentials.session, sizeof session);
- memset(&credentials, 0, sizeof credentials);
- des_key_sched(&session, schedule);
- result = krb_get_tf_fullname(TKT_FILE, tktuser, tktinst, tktrealm);
- if (result) {
- report(stderr, "krb_get_tf_fullname: %sn", krb_get_err_text(result));
- return PS_AUTHFAIL;
- }
- if (strcmp(tktuser, user) != 0) {
- report(stderr,
- _("principal %s in ticket does not match -u %sn"), tktuser,
- user);
- return PS_AUTHFAIL;
- }
- if (tktinst[0]) {
- report(stderr,
- _("non-null instance (%s) might cause strange behaviorn"),
- tktinst);
- strcat(tktuser, ".");
- strcat(tktuser, tktinst);
- }
- if (strcmp(tktrealm, srvrealm) != 0) {
- strcat(tktuser, "@");
- strcat(tktuser, tktrealm);
- }
- result = krb_mk_req(&authenticator, "imap", srvinst, srvrealm,
- challenge1.cint);
- if (result) {
- report(stderr, "krb_mq_req: %sn", krb_get_err_text(result));
- return PS_AUTHFAIL;
- }
- to64frombits(buf1, authenticator.dat, authenticator.length);
- if (outlevel >= O_MONITOR) {
- report(stdout, "IMAP> %sn", buf1);
- }
- strcat(buf1, "rn");
- SockWrite(sock, buf1, strlen(buf1));
- /* Upon decrypting and verifying the ticket and authenticator, the
- * server should verify that the contained checksum field equals
- * the original server provided random 32-bit number. Should the
- * verification be successful, the server must add one to the
- * checksum and construct 8 octets of data, with the first four
- * octets containing the incremented checksum in network byte
- * order, the fifth octet containing a bit-mask specifying the
- * protection mechanisms supported by the server, and the sixth
- * through eighth octets containing, in network byte order, the
- * maximum cipher-text buffer size the server is able to receive.
- * The server must encrypt the 8 octets of data in the session key
- * and issue that encrypted data in a second ready response. The
- * client should consider the server authenticated if the first
- * four octets the un-encrypted data is equal to one plus the
- * checksum it previously sent.
- */
-
- if (result = gen_recv(sock, buf1, sizeof buf1))
- return result;
- /* The client must construct data with the first four octets
- * containing the original server-issued checksum in network byte
- * order, the fifth octet containing the bit-mask specifying the
- * selected protection mechanism, the sixth through eighth octets
- * containing in network byte order the maximum cipher-text buffer
- * size the client is able to receive, and the following octets
- * containing a user name string. The client must then append
- * from one to eight octets so that the length of the data is a
- * multiple of eight octets. The client must then PCBC encrypt the
- * data with the session key and respond to the second ready
- * response with the encrypted data. The server decrypts the data
- * and verifies the contained checksum. The username field
- * identifies the user for whom subsequent IMAP operations are to
- * be performed; the server must verify that the principal
- * identified in the Kerberos ticket is authorized to connect as
- * that user. After these verifications, the authentication
- * process is complete.
- */
- len = from64tobits(buf2, buf1);
- if (len < 0) {
- report(stderr, _("could not decode BASE64 ready responsen"));
- return PS_AUTHFAIL;
- }
- des_ecb_encrypt((des_cblock *)buf2, (des_cblock *)buf2, schedule, 0);
- memcpy(challenge2.cstr, buf2, 4);
- if (ntohl(challenge2.cint) != challenge1.cint + 1) {
- report(stderr, _("challenge mismatchn"));
- return PS_AUTHFAIL;
- }
- memset(authenticator.dat, 0, sizeof authenticator.dat);
- result = htonl(challenge1.cint);
- memcpy(authenticator.dat, &result, sizeof result);
- /* The protection mechanisms and their corresponding bit-masks are as
- * follows:
- *
- * 1 No protection mechanism
- * 2 Integrity (krb_mk_safe) protection
- * 4 Privacy (krb_mk_priv) protection
- */
- authenticator.dat[4] = 1;
- len = strlen(tktuser);
- strncpy(authenticator.dat+8, tktuser, len);
- authenticator.length = len + 8 + 1;
- while (authenticator.length & 7) {
- authenticator.length++;
- }
- des_pcbc_encrypt((des_cblock *)authenticator.dat,
- (des_cblock *)authenticator.dat, authenticator.length, schedule,
- &session, 1);
- to64frombits(buf1, authenticator.dat, authenticator.length);
- if (outlevel >= O_MONITOR) {
- report(stdout, "IMAP> %sn", buf1);
- }
- strcat(buf1, "rn");
- SockWrite(sock, buf1, strlen(buf1));
- if (result = gen_recv(sock, buf1, sizeof buf1))
- return result;
- if (strstr(buf1, "OK")) {
- return PS_SUCCESS;
- }
- else {
- return PS_AUTHFAIL;
- }
- }
- #endif /* KERBEROS_V4 */
- #ifdef GSSAPI
- #define GSSAUTH_P_NONE 1
- #define GSSAUTH_P_INTEGRITY 2
- #define GSSAUTH_P_PRIVACY 4
- static int do_gssauth(int sock, char *hostname, char *username)
- {
- gss_buffer_desc request_buf, send_token;
- gss_buffer_t sec_token;
- gss_name_t target_name;
- gss_ctx_id_t context;
- gss_OID mech_name;
- gss_qop_t quality;
- int cflags;
- OM_uint32 maj_stat, min_stat;
- char buf1[8192], buf2[8192], server_conf_flags;
- unsigned long buf_size;
- int result;
- /* first things first: get an imap ticket for host */
- sprintf(buf1, "imap@%s", hostname);
- request_buf.value = buf1;
- request_buf.length = strlen(buf1) + 1;
- maj_stat = gss_import_name(&min_stat, &request_buf, GSS_C_NT_HOSTBASED_SERVICE,
- &target_name);
- if (maj_stat != GSS_S_COMPLETE) {
- report(stderr, _("Couldn't get service name for [%s]n"), buf1);
- return PS_AUTHFAIL;
- }
- else if (outlevel >= O_DEBUG) {
- maj_stat = gss_display_name(&min_stat, target_name, &request_buf,
- &mech_name);
- report(stderr, _("Using service name [%s]n"),request_buf.value);
- maj_stat = gss_release_buffer(&min_stat, &request_buf);
- }
- gen_send(sock, "AUTHENTICATE GSSAPI");
- /* upon receipt of the GSSAPI authentication request, server returns
- * null data ready response. */
- if (result = gen_recv(sock, buf1, sizeof buf1)) {
- return result;
- }
- /* now start the security context initialisation loop... */
- sec_token = GSS_C_NO_BUFFER;
- context = GSS_C_NO_CONTEXT;
- if (outlevel >= O_VERBOSE)
- report(stdout, _("Sending credentialsn"));
- do {
- send_token.length = 0;
- send_token.value = NULL;
- maj_stat = gss_init_sec_context(&min_stat,
- GSS_C_NO_CREDENTIAL,
- &context,
- target_name,
- GSS_C_NO_OID,
- GSS_C_MUTUAL_FLAG | GSS_C_SEQUENCE_FLAG,
- 0,
- GSS_C_NO_CHANNEL_BINDINGS,
- sec_token,
- NULL,
- &send_token,
- NULL,
- NULL);
- if (maj_stat!=GSS_S_COMPLETE && maj_stat!=GSS_S_CONTINUE_NEEDED) {
- report(stderr, _("Error exchanging credentialsn"));
- gss_release_name(&min_stat, &target_name);
- /* wake up server and await NO response */
- SockWrite(sock, "rn", 2);
- if (result = gen_recv(sock, buf1, sizeof buf1))
- return result;
- return PS_AUTHFAIL;
- }
- to64frombits(buf1, send_token.value, send_token.length);
- gss_release_buffer(&min_stat, &send_token);
- strcat(buf1, "rn");
- SockWrite(sock, buf1, strlen(buf1));
- if (outlevel >= O_MONITOR)
- report(stdout, "IMAP> %sn", buf1);
- if (maj_stat == GSS_S_CONTINUE_NEEDED) {
- if (result = gen_recv(sock, buf1, sizeof buf1)) {
- gss_release_name(&min_stat, &target_name);
- return result;
- }
- request_buf.length = from64tobits(buf2, buf1 + 2);
- request_buf.value = buf2;
- sec_token = &request_buf;
- }
- } while (maj_stat == GSS_S_CONTINUE_NEEDED);
- gss_release_name(&min_stat, &target_name);
- /* get security flags and buffer size */
- if (result = gen_recv(sock, buf1, sizeof buf1)) {
- return result;
- }
- request_buf.length = from64tobits(buf2, buf1 + 2);
- request_buf.value = buf2;
- maj_stat = gss_unwrap(&min_stat, context, &request_buf, &send_token,
- &cflags, &quality);
- if (maj_stat != GSS_S_COMPLETE) {
- report(stderr, _("Couldn't unwrap security level datan"));
- gss_release_buffer(&min_stat, &send_token);
- return PS_AUTHFAIL;
- }
- if (outlevel >= O_DEBUG)
- report(stdout, _("Credential exchange completen"));
- /* first octet is security levels supported. We want none, for now */
- server_conf_flags = ((char *)send_token.value)[0];
- if ( !(((char *)send_token.value)[0] & GSSAUTH_P_NONE) ) {
- report(stderr, _("Server requires integrity and/or privacyn"));
- gss_release_buffer(&min_stat, &send_token);
- return PS_AUTHFAIL;
- }
- ((char *)send_token.value)[0] = 0;
- buf_size = ntohl(*((long *)send_token.value));
- /* we don't care about buffer size if we don't wrap data */
- gss_release_buffer(&min_stat, &send_token);
- if (outlevel >= O_DEBUG) {
- report(stdout, _("Unwrapped security level flags: %s%s%sn"),
- server_conf_flags & GSSAUTH_P_NONE ? "N" : "-",
- server_conf_flags & GSSAUTH_P_INTEGRITY ? "I" : "-",
- server_conf_flags & GSSAUTH_P_PRIVACY ? "C" : "-");
- report(stdout, _("Maximum GSS token size is %ldn"),buf_size);
- }
- /* now respond in kind (hack!!!) */
- buf_size = htonl(buf_size); /* do as they do... only matters if we do enc */
- memcpy(buf1, &buf_size, 4);
- buf1[0] = GSSAUTH_P_NONE;
- strcpy(buf1+4, username); /* server decides if princ is user */
- request_buf.length = 4 + strlen(username) + 1;
- request_buf.value = buf1;
- maj_stat = gss_wrap(&min_stat, context, 0, GSS_C_QOP_DEFAULT, &request_buf,
- &cflags, &send_token);
- if (maj_stat != GSS_S_COMPLETE) {
- report(stderr, _("Error creating security level requestn"));
- return PS_AUTHFAIL;
- }
- to64frombits(buf1, send_token.value, send_token.length);
- if (outlevel >= O_DEBUG) {
- report(stdout, _("Requesting authorization as %sn"), username);
- report(stdout, "IMAP> %sn",buf1);
- }
- strcat(buf1, "rn");
- SockWrite(sock, buf1, strlen(buf1));
- /* we should be done. Get status and finish up */
- if (result = gen_recv(sock, buf1, sizeof buf1))
- return result;
- if (strstr(buf1, "OK")) {
- /* flush security context */
- if (outlevel >= O_DEBUG)
- report(stdout, _("Releasing GSS credentialsn"));
- maj_stat = gss_delete_sec_context(&min_stat, &context, &send_token);
- if (maj_stat != GSS_S_COMPLETE) {
- report(stderr, _("Error releasing credentialsn"));
- return PS_AUTHFAIL;
- }
- /* send_token may contain a notification to the server to flush
- * credentials. RFC 1731 doesn't specify what to do, and since this
- * support is only for authentication, we'll assume the server
- * knows enough to flush its own credentials */
- gss_release_buffer(&min_stat, &send_token);
- return PS_SUCCESS;
- }
- return PS_AUTHFAIL;
- }
- #endif /* GSSAPI */
- static void hmac_md5 (unsigned char *password, size_t pass_len,
- unsigned char *challenge, size_t chal_len,
- unsigned char *response, size_t resp_len)
- {
- int i;
- unsigned char ipad[64];
- unsigned char opad[64];
- unsigned char hash_passwd[16];
- MD5_CTX ctx;
-
- if (resp_len != 16)
- return;
- if (pass_len > sizeof (ipad))
- {
- MD5Init (&ctx);
- MD5Update (&ctx, password, pass_len);
- MD5Final (hash_passwd, &ctx);
- password = hash_passwd; pass_len = sizeof (hash_passwd);
- }
- memset (ipad, 0, sizeof (ipad));
- memset (opad, 0, sizeof (opad));
- memcpy (ipad, password, pass_len);
- memcpy (opad, password, pass_len);
- for (i=0; i<64; i++) {
- ipad[i] ^= 0x36;
- opad[i] ^= 0x5c;
- }
- MD5Init (&ctx);
- MD5Update (&ctx, ipad, sizeof (ipad));
- MD5Update (&ctx, challenge, chal_len);
- MD5Final (response, &ctx);
- MD5Init (&ctx);
- MD5Update (&ctx, opad, sizeof (opad));
- MD5Update (&ctx, response, resp_len);
- MD5Final (response, &ctx);
- }
- #if NTLM_ENABLE
- #include "ntlm.h"
- static tSmbNtlmAuthRequest request;
- static tSmbNtlmAuthChallenge challenge;
- static tSmbNtlmAuthResponse response;
- /*
- * NTLM support by Grant Edwards.
- *
- * Handle MS-Exchange NTLM authentication method. This is the same
- * as the NTLM auth used by Samba for SMB related services. We just
- * encode the packets in base64 instead of sending them out via a
- * network interface.
- *
- * Much source (ntlm.h, smb*.c smb*.h) was borrowed from Samba.
- */
- static int do_imap_ntlm(int sock, struct query *ctl)
- {
- char msgbuf[2048];
- int result,len;
-
- gen_send(sock, "AUTHENTICATE NTLM");
- if ((result = gen_recv(sock, msgbuf, sizeof msgbuf)))
- return result;
-
- if (msgbuf[0] != '+')
- return PS_AUTHFAIL;
-
- buildSmbNtlmAuthRequest(&request,ctl->remotename,NULL);
- if (outlevel >= O_DEBUG)
- dumpSmbNtlmAuthRequest(stdout, &request);
- memset(msgbuf,0,sizeof msgbuf);
- to64frombits (msgbuf, (unsigned char*)&request, SmbLength(&request));
-
- if (outlevel >= O_MONITOR)
- report(stdout, "IMAP> %sn", msgbuf);
-
- strcat(msgbuf,"rn");
- SockWrite (sock, msgbuf, strlen (msgbuf));
- if ((gen_recv(sock, msgbuf, sizeof msgbuf)))
- return result;
-
- len = from64tobits ((unsigned char*)&challenge, msgbuf);
-
- if (outlevel >= O_DEBUG)
- dumpSmbNtlmAuthChallenge(stdout, &challenge);
-
- buildSmbNtlmAuthResponse(&challenge, &response,ctl->remotename,ctl->password);
-
- if (outlevel >= O_DEBUG)
- dumpSmbNtlmAuthResponse(stdout, &response);
-
- memset(msgbuf,0,sizeof msgbuf);
- to64frombits (msgbuf, (unsigned char*)&response, SmbLength(&response));
- if (outlevel >= O_MONITOR)
- report(stdout, "IMAP> %sn", msgbuf);
-
- strcat(msgbuf,"rn");
- SockWrite (sock, msgbuf, strlen (msgbuf));
-
- if ((result = gen_recv (sock, msgbuf, sizeof msgbuf)))
- return result;
-
- if (strstr (msgbuf, "OK"))
- return PS_SUCCESS;
- else
- return PS_AUTHFAIL;
- }
- #endif /* NTLM */
- static int do_cram_md5 (int sock, struct query *ctl)
- /* authenticate as per RFC2195 */
- {
- int result;
- int len;
- unsigned char buf1[1024];
- unsigned char msg_id[768];
- unsigned char response[16];
- unsigned char reply[1024];
- gen_send (sock, "AUTHENTICATE CRAM-MD5");
- /* From RFC2195:
- * The data encoded in the first ready response contains an
- * presumptively arbitrary string of random digits, a timestamp, and the
- * fully-qualified primary host name of the server. The syntax of the
- * unencoded form must correspond to that of an RFC 822 'msg-id'
- * [RFC822] as described in [POP3].
- */
- if ((result = gen_recv (sock, buf1, sizeof (buf1)))) {
- return result;
- }
- len = from64tobits (msg_id, buf1);
- if (len < 0) {
- report (stderr, _("could not decode BASE64 challengen"));
- return PS_AUTHFAIL;
- } else if (len < sizeof (msg_id)) {
- msg_id[len] = 0;
- } else {
- msg_id[sizeof (msg_id)-1] = 0;
- }
- if (outlevel >= O_DEBUG) {
- report (stdout, "decoded as %sn", msg_id);
- }
- /* The client makes note of the data and then responds with a string
- * consisting of the user name, a space, and a 'digest'. The latter is
- * computed by applying the keyed MD5 algorithm from [KEYED-MD5] where
- * the key is a shared secret and the digested text is the timestamp
- * (including angle-brackets).
- */
- hmac_md5 (ctl->password, strlen (ctl->password),
- msg_id, strlen (msg_id),
- response, sizeof (response));
- #ifdef HAVE_SNPRINTF
- snprintf (reply, sizeof (reply),
- #else
- sprintf(reply,
- #endif
- "%s %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
- ctl->remotename,
- response[0], response[1], response[2], response[3],
- response[4], response[5], response[6], response[7],
- response[8], response[9], response[10], response[11],
- response[12], response[13], response[14], response[15]);
- if (outlevel >= O_DEBUG) {
- report (stdout, "replying with %sn", reply);
- }
- to64frombits (buf1, reply, strlen (reply));
- if (outlevel >= O_MONITOR) {
- report (stdout, "IMAP> %sn", buf1);
- }
- /* PMDF5.2 IMAP has a bug that requires this to be a single write */
- strcat (buf1, "rn");
- SockWrite (sock, buf1, strlen (buf1));
- if ((result = gen_recv (sock, buf1, sizeof (buf1))))
- return result;
- if (strstr (buf1, "OK")) {
- return PS_SUCCESS;
- } else {
- return PS_AUTHFAIL;
- }
- }
- int imap_canonicalize(char *result, char *raw, int maxlen)
- /* encode an IMAP password as per RFC1730's quoting conventions */
- {
- int i, j;
- j = 0;
- for (i = 0; i < strlen(raw) && i < maxlen; i++)
- {
- if ((raw[i] == '\') || (raw[i] == '"'))
- result[j++] = '\';
- result[j++] = raw[i];
- }
- result[j] = ' ';
- return(i);
- }
- int imap_getauth(int sock, struct query *ctl, char *greeting)
- /* apply for connection authorization */
- {
- int ok = 0;
- /* probe to see if we're running IMAP4 and can use RFC822.PEEK */
- capabilities[0] = ' ';
- if ((ok = gen_transact(sock, "CAPABILITY")) == PS_SUCCESS)
- {
- /* UW-IMAP server 10.173 notifies in all caps */
- if (strstr(capabilities, "IMAP4REV1"))
- {
- imap_version = IMAP4rev1;
- if (outlevel >= O_DEBUG)
- report(stdout, _("Protocol identified as IMAP4 rev 1n"));
- }
- else
- {
- imap_version = IMAP4;
- if (outlevel >= O_DEBUG)
- report(stdout, _("Protocol identified as IMAP4 rev 0n"));
- }
- }
- else if (ok == PS_ERROR)
- {
- imap_version = IMAP2;
- if (outlevel >= O_DEBUG)
- report(stdout, _("Protocol identified as IMAP2 or IMAP2BISn"));
- }
- else
- return(ok);
- peek_capable = (imap_version >= IMAP4);
- /*
- * Assumption: expunges are cheap, so we want to do them
- * after every message unless user said otherwise.
- */
- if (NUM_SPECIFIED(ctl->expunge))
- expunge_period = NUM_VALUE_OUT(ctl->expunge);
- else
- expunge_period = 1;
- /*
- * If either (a) we saw a PREAUTH token in the capability response, or
- * (b) the user specified ssh preauthentication, then we're done.
- */
- if (preauth || ctl->server.preauthenticate == A_SSH)
- return(PS_SUCCESS);
- #if OPIE_ENABLE
- if ((ctl->server.protocol == P_IMAP) && strstr(capabilities, "AUTH=X-OTP"))
- {
- if (outlevel >= O_DEBUG)
- report(stdout, _("OTP authentication is supportedn"));
- if (do_otp(sock, ctl) == PS_SUCCESS)
- return(PS_SUCCESS);
- };
- #endif /* OPIE_ENABLE */
- #ifdef GSSAPI
- if (strstr(capabilities, "AUTH=GSSAPI"))
- {
- if (ctl->server.protocol == P_IMAP_GSS)
- {
- if (outlevel >= O_DEBUG)
- report(stdout, _("GSS authentication is supportedn"));
- return do_gssauth(sock, ctl->server.truename, ctl->remotename);
- }
- }
- else if (ctl->server.protocol == P_IMAP_GSS)
- {
- report(stderr,
- _("Required GSS capability not supported by servern"));
- return(PS_AUTHFAIL);
- }
- #endif /* GSSAPI */
- #ifdef KERBEROS_V4
- if (strstr(capabilities, "AUTH=KERBEROS_V4"))
- {
- if (outlevel >= O_DEBUG)
- report(stdout, _("KERBEROS_V4 authentication is supportedn"));
- if (ctl->server.protocol == P_IMAP_K4)
- {
- if ((ok = do_rfc1731(sock, ctl->server.truename)))
- {
- if (outlevel >= O_MONITOR)
- report(stdout, "IMAP> *n");
- SockWrite(sock, "*rn", 3);
- }
-
- return(ok);
- }
- /* else fall through to ordinary AUTH=LOGIN case */
- }
- else if (ctl->server.protocol == P_IMAP_K4)
- {
- report(stderr,
- _("Required KERBEROS_V4 capability not supported by servern"));
- return(PS_AUTHFAIL);
- }
- #endif /* KERBEROS_V4 */
- if (strstr(capabilities, "AUTH=CRAM-MD5"))
- {
- if (outlevel >= O_DEBUG)
- report (stdout, _("CRAM-MD5 authentication is supportedn"));
- if (ctl->server.protocol != P_IMAP_LOGIN)
- {
- if ((ok = do_cram_md5 (sock, ctl)))
- {
- if (outlevel >= O_MONITOR)
- report (stdout, "IMAP> *n");
- SockWrite (sock, "*rn", 3);
- }
- return ok;
- }
- }
- else if (ctl->server.protocol == P_IMAP_CRAM_MD5)
- {
- report(stderr,
- _("Required CRAM-MD5 capability not supported by servern"));
- return(PS_AUTHFAIL);
- }
- #ifdef NTLM_ENABLE
- if (strstr (capabilities, "AUTH=NTLM"))
- {
- if (outlevel >= O_DEBUG)
- report (stdout, _("NTLM authentication is supportedn"));
- return do_imap_ntlm (sock, ctl);
- }
- #endif /* NTLM_ENABLE */
- #ifdef __UNUSED__ /* The Cyrus IMAP4rev1 server chokes on this */
- /* this handles either AUTH=LOGIN or AUTH-LOGIN */
- if ((imap_version >= IMAP4rev1) && (!strstr(capabilities, "LOGIN"))) {
- report(stderr,
- _("Required LOGIN capability not supported by servern"));
- return PS_AUTHFAIL;
- };
- #endif /* __UNUSED__ */
- {
- /* these sizes guarantee no buffer overflow */
- char remotename[NAMELEN*2+1], password[PASSWORDLEN*2+1];
- imap_canonicalize(remotename, ctl->remotename, NAMELEN);
- imap_canonicalize(password, ctl->password, PASSWORDLEN);
- ok = gen_transact(sock, "LOGIN "%s" "%s"", remotename, password);
- }
- if (ok)
- return(ok);
-
- return(PS_SUCCESS);
- }
- static int internal_expunge(int sock)
- /* ship an expunge, resetting associated counters */
- {
- int ok;
- if ((ok = gen_transact(sock, "EXPUNGE")))
- return(ok);
- expunged += deletions;
- deletions = 0;
- #ifdef IMAP_UID /* not used */
- expunge_uids(ctl);
- #endif /* IMAP_UID */
- return(PS_SUCCESS);
- }
- static int imap_getrange(int sock,
- struct query *ctl,
- const char *folder,
- int *countp, int *newp, int *bytes)
- /* get range of messages to be fetched */
- {
- int ok;
- /* find out how many messages are waiting */
- *bytes = recent = unseen = -1;
- if (pass > 1)
- {
- /*
- * We have to have an expunge here, otherwise the re-poll will
- * infinite-loop picking up un-expunged messages -- unless the
- * expunge period is one and we've been nuking each message
- * just after deletion.
- */
- ok = 0;
- if (deletions && expunge_period != 1)
- internal_expunge(sock);
- count = -1;
- if (ok || gen_transact(sock, "NOOP"))
- {
- report(stderr, _("re-poll failedn"));
- return(ok);
- }
- else if (count == -1) /* no EXISTS response to NOOP */
- {
- count = recent = 0;
- unseen = -1;
- }
- }
- else
- {
- if (!check_only)
- ok = gen_transact(sock, "SELECT %s", folder ? folder : "INBOX");
- else
- ok = gen_transact(sock, "EXAMINE %s", folder ? folder : "INBOX");
- if (ok != 0)
- {
- report(stderr, _("mailbox selection failedn"));
- return(ok);
- }
- }
- *countp = count;
- /*
- * Note: because IMAP has an is_old method, this number is used
- * only for the "X messages (Y unseen)" notification. Accordingly
- * it doesn't matter much that it can be wrong (e.g. if we see an
- * UNSEEN response but not all messages above the first UNSEEN one
- * are likewise).
- */
- if (unseen >= 0) /* optional, but better if we see it */
- *newp = count - unseen + 1;
- else if (recent >= 0) /* mandatory */
- *newp = recent;
- else
- *newp = -1; /* should never happen, RECENT is mandatory */
- expunged = 0;
- return(PS_SUCCESS);
- }
- static int imap_getsizes(int sock, int count, int *sizes)
- /* capture the sizes of all messages */
- {
- char buf [MSGBUFSIZE+1];
- /*
- * Some servers (as in, PMDF5.1-9.1 under OpenVMS 6.1)
- * won't accept 1:1 as valid set syntax. Some implementors
- * should be taken out and shot for excessive anality.
- */
- if (count == 1)
- gen_send(sock, "FETCH 1 RFC822.SIZE", count);
- else
- gen_send(sock, "FETCH 1:%d RFC822.SIZE", count);
- for (;;)
- {
- int num, size, ok;
- if ((ok = gen_recv(sock, buf, sizeof(buf))))
- return(ok);
- if (strstr(buf, "OK"))
- break;
- else if (sscanf(buf, "* %d FETCH (RFC822.SIZE %d)", &num, &size) == 2)
- sizes[num - 1] = size;
- }
- return(PS_SUCCESS);
- }
- static int imap_is_old(int sock, struct query *ctl, int number)
- /* is the given message old? */
- {
- int ok;
- /* expunges change the fetch numbers */
- number -= expunged;
- if ((ok = gen_transact(sock, "FETCH %d FLAGS", number)) != 0)
- return(PS_ERROR);
- return(seen);
- }
- static int imap_fetch_headers(int sock, struct query *ctl,int number,int *lenp)
- /* request headers of nth message */
- {
- char buf [MSGBUFSIZE+1];
- int num;
- /* expunges change the fetch numbers */
- number -= expunged;
- /*
- * This is blessed by RFC1176, RFC1730, RFC2060.
- * According to the RFCs, it should *not* set the Seen flag.
- */
- gen_send(sock, "FETCH %d RFC822.HEADER", number);
- /* looking for FETCH response */
- do {
- int ok;
- if ((ok = gen_recv(sock, buf, sizeof(buf))))
- return(ok);
- } while
- (sscanf(buf+2, "%d FETCH (%*s {%d}", &num, lenp) != 2);
- if (num != number)
- return(PS_ERROR);
- else
- return(PS_SUCCESS);
- }
- static int imap_fetch_body(int sock, struct query *ctl, int number, int *lenp)
- /* request body of nth message */
- {
- char buf [MSGBUFSIZE+1], *cp;
- int num;
- /* expunges change the fetch numbers */
- number -= expunged;
- /*
- * If we're using IMAP4, we can fetch the message without setting its
- * seen flag. This is good! It means that if the protocol exchange
- * craps out during the message, it will still be marked `unseen' on
- * the server.
- *
- * However...*don't* do this if we're using keep to suppress deletion!
- * In that case, marking the seen flag is the only way to prevent the
- * message from being re-fetched on subsequent runs (and according
- * to RFC2060 p.43 this fetch should set Seen as a side effect).
- */
- switch (imap_version)
- {
- case IMAP4rev1: /* RFC 2060 */
- if (!ctl->keep)
- gen_send(sock, "FETCH %d BODY.PEEK[TEXT]", number);
- else
- gen_send(sock, "FETCH %d BODY[TEXT]", number);
- break;
- case IMAP4: /* RFC 1730 */
- if (!ctl->keep)
- gen_send(sock, "FETCH %d RFC822.TEXT.PEEK", number);
- else
- gen_send(sock, "FETCH %d RFC822.TEXT", number);
- break;
- default: /* RFC 1176 */
- gen_send(sock, "FETCH %d RFC822.TEXT", number);
- break;
- }
- /* looking for FETCH response */
- do {
- int ok;
- if ((ok = gen_recv(sock, buf, sizeof(buf))))
- return(ok);
- } while
- (!strstr(buf+4, "FETCH") || sscanf(buf+2, "%d", &num) != 1);
- if (num != number)
- return(PS_ERROR);
- /*
- * Try to extract a length from the FETCH response. RFC2060 requires
- * it to be present, but at least one IMAP server (Novell GroupWise)
- * botches this.
- */
- if ((cp = strchr(buf, '{')))
- *lenp = atoi(cp + 1);
- else
- *lenp = -1; /* missing length part in FETCH reponse */
- return(PS_SUCCESS);
- }
- static int imap_trail(int sock, struct query *ctl, int number)
- /* discard tail of FETCH response after reading message text */
- {
- /* expunges change the fetch numbers */
- /* number -= expunged; */
- for (;;)
- {
- char buf[MSGBUFSIZE+1];
- int ok;
- if ((ok = gen_recv(sock, buf, sizeof(buf))))
- return(ok);
- /* UW IMAP returns "OK FETCH", Cyrus returns "OK Completed" */
- if (strstr(buf, "OK"))
- break;
- #ifdef __UNUSED__
- /*
- * Any IMAP server that fails to set Seen on a BODY[TEXT]
- * fetch violates RFC2060 p.43 (top). This becomes an issue
- * when keep is on, because seen messages aren't deleted and
- * get refetched on each poll. As a workaround, if keep is on
- * we can set the Seen flag explicitly.
- *
- * This code isn't used yet because we don't know of any IMAP
- * servers broken in this way.
- */
- if (ctl->keep)
- if ((ok = gen_transact(sock,
- imap_version == IMAP4
- ? "STORE %d +FLAGS.SILENT (\Seen)"
- : "STORE %d +FLAGS (\Seen)",
- number)))
- return(ok);
- #endif /* __UNUSED__ */
- }
- return(PS_SUCCESS);
- }
- static int imap_delete(int sock, struct query *ctl, int number)
- /* set delete flag for given message */
- {
- int ok;
- /* expunges change the fetch numbers */
- number -= expunged;
- /*
- * Use SILENT if possible as a minor throughput optimization.
- * Note: this has been dropped from IMAP4rev1.
- *
- * We set Seen because there are some IMAP servers (notably HP
- * OpenMail) that do message-receipt DSNs, but only when the seen
- * bit is set. This is the appropriate time -- we get here right
- * after the local SMTP response that says delivery was
- * successful.
- */
- if ((ok = gen_transact(sock,
- imap_version == IMAP4
- ? "STORE %d +FLAGS.SILENT (\Seen \Deleted)"
- : "STORE %d +FLAGS (\Seen \Deleted)",
- number)))
- return(ok);
- else
- deletions++;
- /*
- * We do an expunge after expunge_period messages, rather than
- * just before quit, so that a line hit during a long session
- * won't result in lots of messages being fetched again during
- * the next session.
- */
- if (NUM_NONZERO(expunge_period) && (deletions % expunge_period) == 0)
- internal_expunge(sock);
- return(PS_SUCCESS);
- }
- static int imap_logout(int sock, struct query *ctl)
- /* send logout command */
- {
- /* if any un-expunged deletions remain, ship an expunge now */
- if (deletions)
- internal_expunge(sock);
- return(gen_transact(sock, "LOGOUT"));
- }
- const static struct method imap =
- {
- "IMAP", /* Internet Message Access Protocol */
- #if INET6_ENABLE
- "imap",
- "imaps",
- #else /* INET6_ENABLE */
- 143, /* standard IMAP2bis/IMAP4 port */
- 993, /* ssl IMAP2bis/IMAP4 port */
- #endif /* INET6_ENABLE */
- TRUE, /* this is a tagged protocol */
- FALSE, /* no message delimiter */
- imap_ok, /* parse command response */
- imap_canonicalize, /* deal with embedded slashes and spaces */
- imap_getauth, /* get authorization */
- imap_getrange, /* query range of messages */
- imap_getsizes, /* get sizes of messages (used for ESMTP SIZE option) */
- imap_is_old, /* no UID check */
- imap_fetch_headers, /* request given message headers */
- imap_fetch_body, /* request given message body */
- imap_trail, /* eat message trailer */
- imap_delete, /* delete the message */
- imap_logout, /* expunge and exit */
- TRUE, /* yes, we can re-poll */
- };
- int doIMAP(struct query *ctl)
- /* retrieve messages using IMAP Version 2bis or Version 4 */
- {
- return(do_protocol(ctl, &imap));
- }
- /* imap.c ends here */