/*
* Log to a cell. If the cell has already been logged to, return without
* doing anything. Otherwise, log to it and mark that it has been logged
* to.
*/
static int auth_to_cell(krb5_context context, char *user, char *cell, char *realm)
{
int status = 0;
char username[BUFSIZ]; /* To hold client username structure */
afs_int32 viceId; /* AFS uid of user */
char name[ANAME_SZ]; /* Name of afs key */
char primary_instance[INST_SZ]; /* Instance of afs key */
char secondary_instance[INST_SZ]; /* Backup instance to try */
int try_secondary = 0; /* Flag to indicate if we try second */
char realm_of_user[REALM_SZ]; /* Kerberos realm of user */
char realm_of_cell[REALM_SZ]; /* Kerberos realm of cell */
char local_cell[MAXCELLCHARS+1];
char cell_to_use[MAXCELLCHARS+1]; /* Cell to authenticate to */
static char lastcell[MAXCELLCHARS+1] = { 0 };
static char confname[512] = { 0 };
krb5_creds *v5cred = NULL;
struct ktc_principal aserver;
struct ktc_principal aclient;
struct ktc_token atoken, btoken;
int afssetpag = 0, uid = -1;
struct passwd *pwd;
memset(name, 0, sizeof(name));
memset(primary_instance, 0, sizeof(primary_instance));
memset(secondary_instance, 0, sizeof(secondary_instance));
memset(realm_of_user, 0, sizeof(realm_of_user));
memset(realm_of_cell, 0, sizeof(realm_of_cell));
syslog(LOG_AUTH|LOG_DEBUG, "LAM aklog starting: user %s uid %d", user, getuid());
if (confname[0] == '\0') {
strncpy(confname, AFSDIR_CLIENT_ETC_DIRPATH, sizeof(confname));
confname[sizeof(confname) - 2] = '\0';
}
/* NULL or empty cell returns information on local cell */
if ((status = get_cellconfig(cell, &ak_cellconfig,
local_cell, linkedcell))) {
syslog(LOG_AUTH|LOG_ERR, "LAM aklog: get_cellconfig returns %d", status);
return(status);
}
strncpy(cell_to_use, ak_cellconfig.name, MAXCELLCHARS);
cell_to_use[MAXCELLCHARS] = 0;
/*
* Find out which realm we're supposed to authenticate to. If one
* is not included, use the kerberos realm found in the credentials
* cache.
*/
if (realm && realm[0]) {
strcpy(realm_of_cell, realm);
}
else {
char *afs_realm = afs_realm_of_cell(context, &ak_cellconfig, FALSE);
if (!afs_realm) {
syslog(LOG_AUTH|LOG_ERR, "LAM aklog: afs_realm_of_cell returns %d", status);
return AFSCONF_FAILURE;
}
strcpy(realm_of_cell, afs_realm);
}
/* We use the afs.<cellname> convention here...
*
* Doug Engert's original code had principals of the form:
*
* "afsx/cell@realm"
*
* in the KDC, so the name wouldn't conflict with DFS. Since we're
* not using DFS, I changed it just to look for the following
* principals:
*
* afs/<cell>@<realm>
* afs@<realm>
*
* Because people are transitioning from afs@realm to afs/cell,
* we configure things so that if the first one isn't found, we
* try the second one. You can select which one you prefer with
* a configure option.
*/
strcpy(name, AFSKEY);
if (1 || strcasecmp(cell_to_use, realm_of_cell) != 0) {
strncpy(primary_instance, cell_to_use, sizeof(primary_instance));
primary_instance[sizeof(primary_instance)-1] = '\0';
if (strcasecmp(cell_to_use, realm_of_cell) == 0) {
try_secondary = 1;
secondary_instance[0] = '\0';
}
} else {
primary_instance[0] = '\0';
try_secondary = 1;
strncpy(secondary_instance, cell_to_use,
sizeof(secondary_instance));
secondary_instance[sizeof(secondary_instance)-1] = '\0';
}
/*
* Extract the session key from the ticket file and hand-frob an
* afs style authenticator.
*/
/*
* Try to obtain AFS tickets. Because there are two valid service
* names, we will try both, but trying the more specific first.
*
* afs/<cell>@<realm> i.e. allow for single name with "."
* afs@<realm>
*/
status = get_credv5(context, user, name, primary_instance, realm_of_cell,
&v5cred);
if ((status == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN ||
status == KRB5KRB_ERR_GENERIC) && !realm_of_cell[0]) {
char *afs_realm = afs_realm_of_cell(context, &ak_cellconfig, TRUE);
if (!afs_realm) {
syslog(LOG_AUTH|LOG_ERR, "LAM aklog: afs_realm_of_cell returns %d", status);
return AFSCONF_FAILURE;
}
strcpy(realm_of_cell, afs_realm);
if (strcasecmp(cell_to_use, realm_of_cell) == 0) {
try_secondary = 1;
secondary_instance[0] = '\0';
}
status = get_credv5(context, user, name, primary_instance,
realm_of_cell, &v5cred);
}
if (status == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN ||
status == KRB5KRB_ERR_GENERIC) {
if (try_secondary)
status = get_credv5(context, user, name, secondary_instance,
realm_of_cell, &v5cred);
}
if (status) {
syslog(LOG_AUTH|LOG_ERR, "LAM aklog: get_credv5 returns %d", status);
return status;
}
strncpy(aserver.name, AFSKEY, MAXKTCNAMELEN - 1);
strncpy(aserver.instance, AFSINST, MAXKTCNAMELEN - 1);
strncpy(aserver.cell, cell_to_use, MAXKTCREALMLEN - 1);
/*
* The default is to use rxkad2b, which means we put in a full
* V5 ticket. If the user specifies -524, we talk to the
* 524 ticket converter.
*/
{
char *p;
int len;
len = min(get_princ_len(context, v5cred->client, 0),
second_comp(context, v5cred->client) ?
MAXKTCNAMELEN - 2 : MAXKTCNAMELEN - 1);
strncpy(username, get_princ_str(context, v5cred->client, 0), len);
username[len] = '\0';
if (second_comp(context, v5cred->client)) {
strcat(username, ".");
p = username + strlen(username);
len = min(get_princ_len(context, v5cred->client, 1),
MAXKTCNAMELEN - strlen(username) - 1);
strncpy(p, get_princ_str(context, v5cred->client, 1), len);
p[len] = '\0';
}
memset(&atoken, 0, sizeof(atoken));
atoken.kvno = RXKAD_TKT_TYPE_KERBEROS_V5;
atoken.startTime = v5cred->times.starttime;;
atoken.endTime = v5cred->times.endtime;
memcpy(&atoken.sessionKey, get_cred_keydata(v5cred),
get_cred_keylen(v5cred));
atoken.ticketLen = v5cred->ticket.length;
memcpy(atoken.ticket, v5cred->ticket.data, atoken.ticketLen);
}
if ((status = get_user_realm(context, realm_of_user))) {
syslog(LOG_AUTH|LOG_ERR, "LAM aklog: get_user_realm returns %d", status);
return KRB5_REALM_UNKNOWN;
}
if (strcmp(realm_of_user, realm_of_cell)) {
strcat(username, "@");
strcat(username, realm_of_user);
}
strcpy(lastcell, aserver.cell);
/*
* This is a crock, but it is Transarc's crock, so
* we have to play along in order to get the
* functionality. The way the afs id is stored is
* as a string in the username field of the token.
* Contrary to what you may think by looking at
* the code for tokens, this hack (AFS ID %d) will
* not work if you change %d to something else.
*/
#if 0
/* This actually crashes long-running daemons */
if (!pr_Initialize (0, confname, aserver.cell))
status = pr_SNameToId (username, &viceId);
if ((status == 0) && (viceId != ANONYMOUSID))
sprintf (username, "AFS ID %d", (int) viceId);
#else
/*
* This actually only works assuming that your uid and pts space match
* and probably this works only for the local cell anyway.
*/
if ((uid = getuid()) == 0) {
if ((pwd = getpwnam(user)) == NULL) {
syslog(LOG_AUTH|LOG_ERR, "LAM aklog: getpwnam %s failed", user);
return AUTH_FAILURE;
}
}
/* Don't do first-time registration. Handle only the simple case */
if ((status == 0) && (viceId != ANONYMOUSID))
sprintf (username, "AFS ID %d", ((uid==0)?(int)pwd->pw_uid:(int)uid));
#endif
/* Reset the "aclient" structure before we call ktc_SetToken.
* This structure was first set by the ktc_GetToken call when
* we were comparing whether identical tokens already existed.
*/
strncpy(aclient.name, username, MAXKTCNAMELEN - 1);
strcpy(aclient.instance, "");
strncpy(aclient.cell, realm_of_user, MAXKTCREALMLEN - 1);
#ifndef AFS_AIX51_ENV
/* on AIX 4.1.4 with AFS 3.4a+ if a write is not done before
* this routine, it will not add the token. It is not clear what
* is going on here! So we will do the following operation.
* On AIX 5 this kills our parent. So we won't.
*/
write(2,"",0); /* dummy write */
#endif
afssetpag = (getpagvalue("afs") > 0) ? 1 : 0;
if (uid == 0) {
struct sigaction newAction, origAction;
pid_t cid, pcid;
int wstatus;
sigemptyset(&newAction.sa_mask);
newAction.sa_handler = SIG_DFL;
newAction.sa_flags = 0;
status = sigaction(SIGCHLD, &newAction, &origAction);
if (status) {
syslog(LOG_AUTH|LOG_ERR, "LAM aklog: sigaction returned %d", status);
return AUTH_FAILURE;
}
syslog(LOG_AUTH|LOG_DEBUG, "LAM aklog: in daemon? forking to set tokens");
cid = fork();
if (cid <= 0) {
syslog(LOG_AUTH|LOG_DEBUG, "LAM aklog child: setting tokens");
setuid(pwd->pw_uid);
status = ktc_SetToken(&aserver, &atoken, &aclient, afssetpag);
if (status != 0)
syslog(LOG_AUTH|LOG_ERR, "LAM aklog child: set tokens, returning %d", status);
exit((status == 0)?0:255);
} else {
do {
pcid = waitpid(cid, &wstatus, 0);
} while ((pcid == -1) && (errno == EINTR));
if ((pcid == cid) && WIFEXITED(wstatus))
status = WEXITSTATUS(wstatus);
else
status = -1;
}
syslog(LOG_AUTH|LOG_DEBUG, "LAM aklog: collected child status %d", status);
sigaction(SIGCHLD, &origAction, NULL);
} else {
status = ktc_SetToken(&aserver, &atoken, &aclient, afssetpag);
}
if (status != 0)
syslog(LOG_AUTH|LOG_ERR, "LAM aklog: set tokens returned %d", status);
else
syslog(LOG_AUTH|LOG_DEBUG, "LAM aklog: set tokens, pag %d", getpagvalue("afs"));
return(status);
}
static int
CommandProc(struct cmd_syndesc *as, void *arock)
{
krb5_principal princ = 0;
char *cell, *pname, **hrealms, *service;
char service_temp[MAXKTCREALMLEN + 20];
krb5_creds incred[1], mcred[1], *outcred = 0, *afscred;
krb5_ccache cc = 0;
#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
krb5_get_init_creds_opt *gic_opts;
#else
krb5_get_init_creds_opt gic_opts[1];
#endif
char *tofree = NULL, *outname;
int code;
char *what;
int i, dosetpag, evil, noprdb, id;
#ifdef AFS_RXK5
int authtype;
#endif
krb5_data enc_part[1];
krb5_prompter_fct pf = NULL;
char *pass = 0;
void *pa = 0;
struct kp_arg klog_arg[1];
char passwd[BUFSIZ];
struct afsconf_cell cellconfig[1];
static char rn[] = "klog"; /*Routine name */
static int Pipe = 0; /* reading from a pipe */
static int Silent = 0; /* Don't want error messages */
int writeTicketFile = 0; /* write ticket file to /tmp */
service = 0;
memset(incred, 0, sizeof *incred);
/* blow away command line arguments */
for (i = 1; i < zero_argc; i++)
memset(zero_argv[i], 0, strlen(zero_argv[i]));
zero_argc = 0;
memset(klog_arg, 0, sizeof *klog_arg);
/* first determine quiet flag based on -silent switch */
Silent = (as->parms[aSILENT].items ? 1 : 0);
if (Silent) {
afs_set_com_err_hook(silent_errors);
}
if ((code = krb5_init_context(&k5context))) {
afs_com_err(rn, code, "while initializing Kerberos 5 library");
KLOGEXIT(code);
}
if ((code = rx_Init(0))) {
afs_com_err(rn, code, "while initializing rx");
KLOGEXIT(code);
}
initialize_U_error_table();
/*initialize_krb5_error_table();*/
initialize_RXK_error_table();
initialize_KTC_error_table();
initialize_ACFG_error_table();
/* initialize_rx_error_table(); */
if (!(tdir = afsconf_Open(AFSDIR_CLIENT_ETC_DIRPATH))) {
afs_com_err(rn, 0, "can't get afs configuration (afsconf_Open(%s))",
AFSDIR_CLIENT_ETC_DIRPATH);
KLOGEXIT(1);
}
/*
* Enable DES enctypes, which are currently still required for AFS.
* krb5_allow_weak_crypto is MIT Kerberos 1.8. krb5_enctype_enable is
* Heimdal.
*/
#if defined(HAVE_KRB5_ENCTYPE_ENABLE)
i = krb5_enctype_valid(k5context, ETYPE_DES_CBC_CRC);
if (i)
krb5_enctype_enable(k5context, ETYPE_DES_CBC_CRC);
#elif defined(HAVE_KRB5_ALLOW_WEAK_CRYPTO)
krb5_allow_weak_crypto(k5context, 1);
#endif
/* Parse remaining arguments. */
dosetpag = !! as->parms[aSETPAG].items;
Pipe = !! as->parms[aPIPE].items;
writeTicketFile = !! as->parms[aTMP].items;
noprdb = !! as->parms[aNOPRDB].items;
evil = (always_evil&1) || !! as->parms[aUNWRAP].items;
#ifdef AFS_RXK5
authtype = 0;
if (as->parms[aK5].items)
authtype |= FORCE_RXK5;
if (as->parms[aK4].items)
authtype |= FORCE_RXKAD;
if (!authtype)
authtype |= env_afs_rxk5_default();
#endif
cell = as->parms[aCELL].items ? as->parms[aCELL].items->data : 0;
if ((code = afsconf_GetCellInfo(tdir, cell, "afsprot", cellconfig))) {
if (cell)
afs_com_err(rn, code, "Can't get cell information for '%s'", cell);
else
afs_com_err(rn, code, "Can't get determine local cell!");
KLOGEXIT(code);
}
if (as->parms[aKRBREALM].items) {
code = krb5_set_default_realm(k5context,
as->parms[aKRBREALM].items->data);
if (code) {
afs_com_err(rn, code, "Can't make <%s> the default realm",
as->parms[aKRBREALM].items->data);
KLOGEXIT(code);
}
}
else if ((code = krb5_get_host_realm(k5context, cellconfig->hostName[0], &hrealms))) {
afs_com_err(rn, code, "Can't get realm for host <%s> in cell <%s>\n",
cellconfig->hostName[0], cellconfig->name);
KLOGEXIT(code);
} else {
if (hrealms && *hrealms) {
code = krb5_set_default_realm(k5context,
*hrealms);
if (code) {
afs_com_err(rn, code, "Can't make <%s> the default realm",
*hrealms);
KLOGEXIT(code);
}
}
if (hrealms) krb5_free_host_realm(k5context, hrealms);
}
id = getuid();
if (as->parms[aPRINCIPAL].items) {
pname = as->parms[aPRINCIPAL].items->data;
} else {
/* No explicit name provided: use Unix uid. */
struct passwd *pw;
pw = getpwuid(id);
if (pw == 0) {
afs_com_err(rn, 0,
"Can't figure out your name from your user id (%d).", id);
if (!Silent)
fprintf(stderr, "%s: Try providing the user name.\n", rn);
KLOGEXIT(1);
}
pname = pw->pw_name;
}
code = krb5_parse_name(k5context, pname, &princ);
if (code) {
afs_com_err(rn, code, "Can't parse principal <%s>", pname);
KLOGEXIT(code);
}
if (as->parms[aPASSWORD].items) {
/*
* Current argument is the desired password string. Remember it in
* our local buffer, and zero out the argument string - anyone can
* see it there with ps!
*/
strncpy(passwd, as->parms[aPASSWORD].items->data, sizeof(passwd));
memset(as->parms[aPASSWORD].items->data, 0,
strlen(as->parms[aPASSWORD].items->data));
pass = passwd;
}
/* Get the password if it wasn't provided. */
if (!pass) {
if (Pipe) {
strncpy(passwd, getpipepass(), sizeof(passwd));
pass = passwd;
} else {
pf = klog_prompter;
pa = klog_arg;
}
}
service = 0;
#ifdef AFS_RXK5
if (authtype & FORCE_RXK5) {
tofree = get_afs_krb5_svc_princ(cellconfig);
snprintf(service_temp, sizeof service_temp, "%s", tofree);
} else
#endif
snprintf (service_temp, sizeof service_temp, "afs/%s", cellconfig->name);
klog_arg->pp = &pass;
klog_arg->pstore = passwd;
klog_arg->allocated = sizeof(passwd);
/* XXX should allow k5 to prompt in most cases -- what about expired pw?*/
#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
code = krb5_get_init_creds_opt_alloc(k5context, &gic_opts);
if (code) {
afs_com_err(rn, code, "Can't allocate get_init_creds options");
KLOGEXIT(code);
}
#else
krb5_get_init_creds_opt_init(gic_opts);
#endif
for (;;) {
code = krb5_get_init_creds_password(k5context,
incred,
princ,
pass,
pf, /* prompter */
pa, /* data */
0, /* start_time */
0, /* in_tkt_service */
gic_opts);
if (code != KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN)
break;
}
memset(passwd, 0, sizeof(passwd));
if (code) {
char *r = 0;
if (krb5_get_default_realm(k5context, &r))
r = 0;
if (r)
afs_com_err(rn, code, "Unable to authenticate in realm %s", r);
else
afs_com_err(rn, code, "Unable to authenticate to use cell %s",
cellconfig->name);
if (r) free(r);
KLOGEXIT(code);
}
for (;;writeTicketFile = 0) {
if (writeTicketFile) {
what = "getting default ccache";
code = krb5_cc_default(k5context, &cc);
} else {
what = "krb5_cc_resolve";
code = krb5_cc_resolve(k5context, "MEMORY:core", &cc);
if (code) goto Failed;
}
what = "initializing ccache";
code = krb5_cc_initialize(k5context, cc, princ);
if (code) goto Failed;
what = "writing Kerberos ticket file";
code = krb5_cc_store_cred(k5context, cc, incred);
if (code) goto Failed;
if (writeTicketFile)
fprintf(stderr,
"Wrote ticket file to %s\n",
krb5_cc_get_name(k5context, cc));
break;
Failed:
if (code)
afs_com_err(rn, code, "%s", what);
if (writeTicketFile) {
if (cc) {
krb5_cc_close(k5context, cc);
cc = 0;
}
continue;
}
KLOGEXIT(code);
}
for (service = service_temp;;service = "afs") {
memset(mcred, 0, sizeof *mcred);
mcred->client = princ;
code = krb5_parse_name(k5context, service, &mcred->server);
if (code) {
afs_com_err(rn, code, "Unable to parse service <%s>\n", service);
KLOGEXIT(code);
}
if (tofree) { free(tofree); tofree = 0; }
if (!(code = krb5_unparse_name(k5context, mcred->server, &outname)))
tofree = outname;
else outname = service;
code = krb5_get_credentials(k5context, 0, cc, mcred, &outcred);
krb5_free_principal(k5context, mcred->server);
if (code != KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN || service != service_temp) break;
#ifdef AFS_RXK5
if (authtype & FORCE_RXK5)
break;
#endif
}
afscred = outcred;
if (code) {
afs_com_err(rn, code, "Unable to get credentials to use %s", outname);
KLOGEXIT(code);
}
#ifdef AFS_RXK5
if (authtype & FORCE_RXK5) {
struct ktc_principal aserver[1];
int viceid = 555;
memset(aserver, 0, sizeof *aserver);
strncpy(aserver->cell, cellconfig->name, MAXKTCREALMLEN-1);
code = ktc_SetK5Token(k5context, aserver, afscred, viceid, dosetpag);
if (code) {
afs_com_err(rn, code, "Unable to store tokens for cell %s\n",
cellconfig->name);
KLOGEXIT(1);
}
} else
#endif
{
struct ktc_principal aserver[1], aclient[1];
struct ktc_token atoken[1];
memset(atoken, 0, sizeof *atoken);
if (evil) {
size_t elen = enc_part->length;
atoken->kvno = RXKAD_TKT_TYPE_KERBEROS_V5_ENCPART_ONLY;
if (afs_krb5_skip_ticket_wrapper(afscred->ticket.data,
afscred->ticket.length, (char **) &enc_part->data,
&elen)) {
afs_com_err(rn, 0, "Can't unwrap %s AFS credential",
cellconfig->name);
KLOGEXIT(1);
}
} else {
atoken->kvno = RXKAD_TKT_TYPE_KERBEROS_V5;
*enc_part = afscred->ticket;
}
atoken->startTime = afscred->times.starttime;
atoken->endTime = afscred->times.endtime;
if (tkt_DeriveDesKey(get_creds_enctype(afscred),
get_cred_keydata(afscred),
get_cred_keylen(afscred), &atoken->sessionKey)) {
afs_com_err(rn, 0,
"Cannot derive DES key from enctype %i of length %u",
get_creds_enctype(afscred),
(unsigned)get_cred_keylen(afscred));
KLOGEXIT(1);
}
memcpy(atoken->ticket, enc_part->data,
atoken->ticketLen = enc_part->length);
memset(aserver, 0, sizeof *aserver);
strncpy(aserver->name, "afs", 4);
strncpy(aserver->cell, cellconfig->name, MAXKTCREALMLEN-1);
memset(aclient, 0, sizeof *aclient);
i = realm_len(k5context, afscred->client);
if (i > MAXKTCREALMLEN-1) i = MAXKTCREALMLEN-1;
memcpy(aclient->cell, realm_data(k5context, afscred->client), i);
if (!noprdb) {
int viceid = 0;
k5_to_k4_name(k5context, afscred->client, aclient);
code = whoami(atoken, cellconfig, aclient, &viceid);
if (code) {
afs_com_err(rn, code, "Can't get your viceid for cell %s", cellconfig->name);
*aclient->name = 0;
} else
snprintf(aclient->name, MAXKTCNAMELEN-1, "AFS ID %d", viceid);
}
if (!*aclient->name)
k5_to_k4_name(k5context, afscred->client, aclient);
code = ktc_SetToken(aserver, atoken, aclient, dosetpag);
if (code) {
afs_com_err(rn, code, "Unable to store tokens for cell %s\n",
cellconfig->name);
KLOGEXIT(1);
}
}
krb5_free_principal(k5context, princ);
krb5_free_cred_contents(k5context, incred);
if (outcred) krb5_free_creds(k5context, outcred);
if (cc)
krb5_cc_close(k5context, cc);
if (tofree) free(tofree);
return 0;
}
