int main() {
char input;
int running = 1;
float my_number;
char my_string[MAX_STRING_LEN];
LinkedList my_list;
ll_init_list(&my_list);
while (running) {
printf("\nq: quit, n: add number, s: add word, d: show list\n");
printf("--------------------------------------------------------\n");
printf("Action: ");
scanf(" %c", &input);
switch (input) {
case 'q':
running = 0;
break;
case 'n':
printf("Type a number: ");
scanf(" %f", &my_number);
fflush(stdin);
ll_add_number(&my_list, my_number);
break;
case 's':
printf("Type a word: ");
scanf(" %s", my_string);
fflush(stdin);
ll_add_string(&my_list, my_string);
break;
case 'd':
ll_display_list(&my_list);
break;
default:
printf("Unrecognized command \"%c\"\n", input);
}
}
}
/*
* 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 *cell, char *realm)
{
int status = AKLOG_SUCCESS;
char username[BUFSIZ]; /* To hold client username structure */
char name[ANAME_SZ]; /* Name of afs key */
char instance[INST_SZ]; /* Instance of afs key */
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 */
krb5_creds *v5cred = NULL;
#ifdef HAVE_KRB4
CREDENTIALS c;
#endif
struct ktc_principal aserver;
struct ktc_principal aclient;
struct ktc_token atoken, btoken;
struct afsconf_cell ak_cellconfig; /* General information about the cell */
int i;
int getLinkedCell = 0;
/* try to avoid an expensive call to get_cellconfig */
if (cell && ll_string_check(&authedcells, cell))
{
if (dflag)
printf("Already authenticated to %s (or tried to)\n", cell);
return(AKLOG_SUCCESS);
}
memset(name, 0, sizeof(name));
memset(instance, 0, sizeof(instance));
memset(realm_of_user, 0, sizeof(realm_of_user));
memset(realm_of_cell, 0, sizeof(realm_of_cell));
memset(&ak_cellconfig, 0, sizeof(ak_cellconfig));
/* NULL or empty cell returns information on local cell */
if (status = get_cellconfig(cell, &ak_cellconfig, local_cell))
return(status);
linkedCell:
if (getLinkedCell)
strncpy(cell_to_use, ak_cellconfig.linkedCell, MAXCELLCHARS);
else
strncpy(cell_to_use, ak_cellconfig.name, MAXCELLCHARS);
cell_to_use[MAXCELLCHARS] = 0;
if (ll_string_check(&authedcells, cell_to_use))
{
if (dflag)
printf("Already authenticated to %s (or tried to)\n", cell_to_use);
status = AKLOG_SUCCESS;
goto done2;
}
/*
* Record that we have attempted to log to this cell. We do this
* before we try rather than after so that we will not try
* and fail repeatedly for one cell.
*/
(void)ll_add_string(&authedcells, cell_to_use);
if (dflag)
printf("Authenticating to cell %s.\n", cell_to_use);
/* We use the afs.<cellname> convention here... */
strcpy(name, AFSKEY);
strncpy(instance, cell_to_use, sizeof(instance));
instance[sizeof(instance)-1] = '\0';
/*
* Extract the session key from the ticket file and hand-frob an
* afs style authenticator.
*/
if (usev5)
{ /* using krb5 */
int retry = 1;
int realm_fallback = 0;
if ((status = get_v5_user_realm(context, realm_of_user)) != KSUCCESS) {
char * msg;
if (pkrb5_get_error_message)
msg = pkrb5_get_error_message(context, status);
else
msg = (char *)error_message(status);
fprintf(stderr, "%s: Couldn't determine realm of user: %s\n",
progname, msg);
if (pkrb5_free_error_message)
pkrb5_free_error_message(context, msg);
status = AKLOG_KERBEROS;
goto done;
}
if ( strchr(name,'.') != NULL ) {
fprintf(stderr, "%s: Can't support principal names including a dot.\n",
progname);
status = AKLOG_MISC;
goto done;
}
try_v5:
if (realm && realm[0]) {
if (dflag)
printf("Getting v5 tickets: %s/%s@%s\n", name, instance, realm);
status = get_v5cred(context, name, instance, realm,
#ifdef HAVE_KRB4
use524 ? &c : NULL,
#else
NULL,
#endif
&v5cred);
strcpy(realm_of_cell, realm);
} else {
strcpy(realm_of_cell,
afs_realm_of_cell5(context, &ak_cellconfig, realm_fallback));
if (retry == 1 && realm_fallback == 0) {
/* Only try the realm_of_user once */
status = -1;
if (dflag)
printf("Getting v5 tickets: %s/%s@%s\n", name, instance, realm_of_user);
status = get_v5cred(context, name, instance, realm_of_user,
#ifdef HAVE_KRB4
use524 ? &c : NULL,
#else
NULL,
#endif
&v5cred);
if (status == 0) {
/* we have determined that the client realm
* is a valid cell realm
*/
strcpy(realm_of_cell, realm_of_user);
}
}
if (status != 0 && (!retry || retry && strcmp(realm_of_user,realm_of_cell))) {
if (dflag)
printf("Getting v5 tickets: %s/%s@%s\n", name, instance, realm_of_cell);
status = get_v5cred(context, name, instance, realm_of_cell,
#ifdef HAVE_KRB4
use524 ? &c : NULL,
#else
NULL,
#endif
&v5cred);
if (!status && !strlen(realm_of_cell))
copy_realm_of_ticket(context, realm_of_cell, sizeof(realm_of_cell), v5cred);
}
}
if (!realm_fallback && status == KRB5_ERR_HOST_REALM_UNKNOWN) {
realm_fallback = 1;
goto try_v5;
} else if (status == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN) {
if (!realm_fallback && !realm_of_cell[0]) {
realm_fallback = 1;
goto try_v5;
}
if (dflag)
printf("Getting v5 tickets: %s@%s\n", name, realm_of_cell);
status = get_v5cred(context, name, "", realm_of_cell,
#ifdef HAVE_KRB4
use524 ? &c : NULL,
#else
NULL,
#endif
&v5cred);
if (!status && !strlen(realm_of_cell))
copy_realm_of_ticket(context, realm_of_cell, sizeof(realm_of_cell), v5cred);
}
if ( status == KRB5KRB_AP_ERR_MSG_TYPE && retry ) {
retry = 0;
realm_fallback = 0;
goto try_v5;
}
}
else
{
#ifdef HAVE_KRB4
if (realm && realm[0])
strcpy(realm_of_cell, realm);
else
strcpy(realm_of_cell, afs_realm_of_cell(&ak_cellconfig));
/*
* 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>
* afs@<realm>
*/
if (dflag)
printf("Getting tickets: %s.%s@%s\n", name, instance, realm_of_cell);
status = get_cred(name, instance, realm_of_cell, &c);
if (status == KDC_PR_UNKNOWN)
{
if (dflag)
printf("Getting tickets: %s@%s\n", name, realm_of_cell);
status = get_cred(name, "", realm_of_cell, &c);
}
#else
status = AKLOG_MISC;
goto done;
#endif
}
if (status != KSUCCESS)
{
char * msg = NULL;
if (dflag)
printf("Kerberos error code returned by get_cred: %d\n", status);
if (usev5) {
if (pkrb5_get_error_message)
msg = pkrb5_get_error_message(context, status);
else
msg = (char *)error_message(status);
}
#ifdef HAVE_KRB4
else
msg = krb_err_text(status);
#endif
fprintf(stderr, "%s: Couldn't get %s AFS tickets: %s\n",
progname, cell_to_use, msg?msg:"(unknown error)");
if (usev5 && pkrb5_free_error_message)
pkrb5_free_error_message(context, msg);
status = AKLOG_KERBEROS;
goto done;
}
strncpy(aserver.name, AFSKEY, MAXKTCNAMELEN - 1);
strncpy(aserver.instance, AFSINST, MAXKTCNAMELEN - 1);
strncpy(aserver.cell, cell_to_use, MAXKTCREALMLEN - 1);
if (usev5 && !use524) {
/* This code inserts the entire K5 ticket into the token
* No need to perform a krb524 translation which is
* commented out in the code below
*/
char * p;
int len;
len = min(v5cred->client->data[0].length,MAXKTCNAMELEN - 1);
strncpy(username, v5cred->client->data[0].data, len);
username[len] = '\0';
if ( v5cred->client->length > 1 ) {
strcat(username, ".");
p = username + strlen(username);
len = min(v5cred->client->data[1].length, (unsigned int)(MAXKTCNAMELEN - strlen(username) - 1));
strncpy(p, v5cred->client->data[1].data, 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, v5cred->keyblock.contents, v5cred->keyblock.length);
atoken.ticketLen = v5cred->ticket.length;
memcpy(atoken.ticket, v5cred->ticket.data, atoken.ticketLen);
} else {
#ifdef HAVE_KRB4
strcpy (username, c.pname);
if (c.pinst[0])
{
strcat(username, ".");
strcat(username, c.pinst);
}
atoken.kvno = c.kvno;
atoken.startTime = c.issue_date;
/* ticket lifetime is in five-minutes blocks. */
atoken.endTime = c.issue_date + ((unsigned char)c.lifetime * 5 * 60);
memcpy(&atoken.sessionKey, c.session, 8);
atoken.ticketLen = c.ticket_st.length;
memcpy(atoken.ticket, c.ticket_st.dat, atoken.ticketLen);
#else
status = AKLOG_MISC;
goto done;
#endif
}
if (!force &&
!ktc_GetToken(&aserver, &btoken, sizeof(btoken), &aclient) &&
atoken.kvno == btoken.kvno &&
atoken.ticketLen == btoken.ticketLen &&
!memcmp(&atoken.sessionKey, &btoken.sessionKey, sizeof(atoken.sessionKey)) &&
!memcmp(atoken.ticket, btoken.ticket, atoken.ticketLen))
{
if (dflag)
printf("Identical tokens already exist; skipping.\n");
status = AKLOG_SUCCESS;
goto done2;
}
if (noprdb)
{
if (dflag)
printf("Not resolving name %s to id (-noprdb set)\n", username);
}
else
{
if (!usev5) {
#ifdef HAVE_KRB4
if ((status = krb_get_tf_realm(TKT_FILE, realm_of_user)) != KSUCCESS)
{
fprintf(stderr, "%s: Couldn't determine realm of user: %s)",
progname, krb_err_text(status));
status = AKLOG_KERBEROS;
goto done;
}
#else
status = AKLOG_MISC;
goto done;
#endif
}
/* For Network Identity Manager append the realm to the name */
strcat(username, "@");
strcat(username, realm_of_user);
ViceIDToUsername(username, realm_of_user, realm_of_cell, cell_to_use,
#ifdef HAVE_KRB4
&c,
#else
NULL,
#endif
&status, &aclient, &aserver, &atoken);
}
if (dflag)
printf("Set username to %s\n", username);
/* 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, "");
if (usev5 && !use524) {
int len = min(v5cred->client->realm.length,MAXKTCNAMELEN - 1);
strncpy(aclient.cell, v5cred->client->realm.data, len);
aclient.cell[len] = '\0';
}
#ifdef HAVE_KRB4
else
strncpy(aclient.cell, c.realm, MAXKTCREALMLEN - 1);
#endif
for ( i=0; aclient.cell[i]; i++ ) {
if ( islower(aclient.cell[i]) )
aclient.cell[i] = toupper(aclient.cell[i]);
}
if (dflag)
printf("Getting tokens.\n");
if (status = ktc_SetToken(&aserver, &atoken, &aclient, 0))
{
afs_com_err(progname, status,
"while obtaining tokens for cell %s\n",
cell_to_use);
status = AKLOG_TOKEN;
}
done2:
if (ak_cellconfig.linkedCell && !getLinkedCell) {
getLinkedCell = 1;
goto linkedCell;
}
done:
#if 0
/*
* intentionally leak the linkedCell field because it was allocated
* using a different C RTL version.
*/
if (ak_cellconfig.linkedCell)
free(ak_cellconfig.linkedCell);
#endif
return(status);
}
/*
* 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(char *cell, char *realm)
{
int status = AKLOG_SUCCESS;
char username[BUFSIZ]; /* To hold client username structure */
long viceId; /* AFS uid of user */
char name[ANAME_SZ]; /* Name of afs key */
char instance[INST_SZ]; /* Instance of afs key */
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 */
int i,j;
CREDENTIALS c;
struct ktc_principal aserver;
struct ktc_principal aclient;
struct ktc_token atoken, btoken;
/* try to avoid an expensive call to get_cellconfig */
if (cell && ll_string_check(&authedcells, cell))
{
if (dflag)
printf("Already authenticated to %s (or tried to)\n", cell);
return(AKLOG_SUCCESS);
}
memset(name, 0, sizeof(name));
memset(instance, 0, sizeof(instance));
memset(realm_of_user, 0, sizeof(realm_of_user));
memset(realm_of_cell, 0, sizeof(realm_of_cell));
/* NULL or empty cell returns information on local cell */
if (status = get_cellconfig(cell, &ak_cellconfig, local_cell))
return(status);
strncpy(cell_to_use, ak_cellconfig.name, MAXCELLCHARS);
cell_to_use[MAXCELLCHARS] = 0;
if (ll_string_check(&authedcells, cell_to_use))
{
if (dflag)
printf("Already authenticated to %s (or tried to)\n", cell_to_use);
return(AKLOG_SUCCESS);
}
/*
* Record that we have attempted to log to this cell. We do this
* before we try rather than after so that we will not try
* and fail repeatedly for one cell.
*/
(void)ll_add_string(&authedcells, cell_to_use);
if (dflag)
printf("Authenticating to cell %s.\n", cell_to_use);
if (realm && realm[0])
strcpy(realm_of_cell, realm);
else
strcpy(realm_of_cell, afs_realm_of_cell(&ak_cellconfig));
/* We use the afs.<cellname> convention here... */
strcpy(name, AFSKEY);
strncpy(instance, cell_to_use, sizeof(instance));
instance[sizeof(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>
* afs@<realm>
*/
if (dflag)
printf("Getting tickets: %s.%s@%s\n", name, instance, realm_of_cell);
status = get_cred(name, instance, realm_of_cell, &c);
if (status == KDC_PR_UNKNOWN)
{
if (dflag)
printf("Getting tickets: %s@%s\n", name, realm_of_cell);
status = get_cred(name, "", realm_of_cell, &c);
}
if (status != KSUCCESS)
{
if (dflag)
printf("Kerberos error code returned by get_cred: %d\n", status);
fprintf(stderr, "%s: Couldn't get %s AFS tickets: %s\n",
progname, cell_to_use, krb_err_txt[status]);
return(AKLOG_KERBEROS);
}
strncpy(aserver.name, AFSKEY, MAXKTCNAMELEN - 1);
strncpy(aserver.instance, AFSINST, MAXKTCNAMELEN - 1);
strncpy(aserver.cell, cell_to_use, MAXKTCREALMLEN - 1);
strcpy (username, c.pname);
if (c.pinst[0])
{
strcat(username, ".");
strcat(username, c.pinst);
}
atoken.kvno = c.kvno;
atoken.startTime = c.issue_date;
/* ticket lifetime is in five-minutes blocks. */
atoken.endTime = c.issue_date + ((unsigned char)c.lifetime * 5 * 60);
memcpy(&atoken.sessionKey, c.session, 8);
atoken.ticketLen = c.ticket_st.length;
memcpy(atoken.ticket, c.ticket_st.dat, atoken.ticketLen);
if (!force &&
!ktc_GetToken(&aserver, &btoken, sizeof(btoken), &aclient) &&
atoken.kvno == btoken.kvno &&
atoken.ticketLen == btoken.ticketLen &&
!memcmp(&atoken.sessionKey, &btoken.sessionKey, sizeof(atoken.sessionKey)) &&
!memcmp(atoken.ticket, btoken.ticket, atoken.ticketLen))
{
if (dflag)
printf("Identical tokens already exist; skipping.\n");
return 0;
}
if (noprdb)
{
if (dflag)
printf("Not resolving name %s to id (-noprdb set)\n", username);
}
else
{
if ((status = krb_get_tf_realm(TKT_FILE, realm_of_user)) != KSUCCESS)
{
fprintf(stderr, "%s: Couldn't determine realm of user: %s)",
progname, krb_err_txt[status]);
return(AKLOG_KERBEROS);
}
if (strcmp(realm_of_user, realm_of_cell))
{
strcat(username, "@");
strcat(username, realm_of_user);
}
if (dflag)
printf("About to resolve name %s to id\n", username);
if (!pr_Initialize (0, AFSDIR_CLIENT_ETC_DIRPATH, aserver.cell))
status = pr_SNameToId (username, &viceId);
if (dflag)
{
if (status)
printf("Error %d\n", status);
else
printf("Id %d\n", viceId);
}
/*
* 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 ((status == 0) && (viceId != ANONYMOUSID))
sprintf (username, "AFS ID %d", viceId);
}
if (dflag)
printf("Set username to %s\n", username);
/* 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, c.realm, MAXKTCREALMLEN - 1);
if (dflag)
printf("Getting tokens.\n");
if (status = ktc_SetToken(&aserver, &atoken, &aclient, 0))
{
fprintf(stderr,
"%s: unable to obtain tokens for cell %s (status: %d).\n",
progname, cell_to_use, status);
status = AKLOG_TOKEN;
}
return(status);
}
