/* * Copyright 2000, International Business Machines Corporation and others. * All Rights Reserved. * * This software has been released under the terms of the IBM Public * License. For details, see the LICENSE file in the top-level source * directory or online at http://www.openafs.org/dl/license10.html */ /* ticket caching code */ #include #if defined(UKERNEL) #include "afs/param.h" #else #include #endif RCSID ("$Header: /cvs/openafs/src/auth/ktc.c,v 1.15.2.10 2007/12/13 18:54:09 shadow Exp $"); #if defined(UKERNEL) #include "afs/sysincludes.h" #include "afsincludes.h" #include "afs/stds.h" #include "afs/pthread_glock.h" #include "afs/vice.h" #include "afs/auth.h" #include "afs/venus.h" #include "afs/pthread_glock.h" #include "afs/dirpath.h" #if !defined(min) #define min(a,b) ((a)<(b)?(a):(b)) #endif /* !defined(min) */ #else /* defined(UKERNEL) */ #ifdef AFS_SUN5_ENV #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef AFS_AIX_ENV #include #ifdef AFS_AIX51_ENV #include #include #endif #endif #ifdef HAVE_UNISTD_H #include #endif #include "auth.h" #include #include #endif /* defined(UKERNEL) */ /* For malloc() */ #include #include "ktc.h" #ifdef notdef /* AFS_KERBEROS_ENV is now conditionally defined in the Makefile */ #define AFS_KERBEROS_ENV #endif #ifdef AFS_KERBEROS_ENV #include #include #include "cellconfig.h" static char lcell[MAXCELLCHARS]; #define TKT_ROOT "/tmp/tkt" #define KSUCCESS 0 #define KFAILURE 255 /* Definitions for ticket file utilities */ #define R_TKT_FIL 0 #define W_TKT_FIL 1 /* Error codes returned by ticket file utilities */ #define NO_TKT_FIL 76 /* No ticket file found */ #define TKT_FIL_ACC 77 /* Couldn't access tkt file */ #define TKT_FIL_LCK 78 /* Couldn't lock ticket file */ #define TKT_FIL_FMT 79 /* Bad ticket file format */ #define TKT_FIL_INI 80 /* afs_tf_init not called first */ /* Values returned by get_credentials */ #define RET_TKFIL 21 /* Can't read ticket file */ #ifndef BUFSIZ #define BUFSIZ 4096 #endif #ifdef AFS_HPUX_ENV #include #endif #if defined(AFS_AIX_ENV) || defined(AFS_SUN5_ENV) static struct flock fileWlock = { F_WRLCK, 0, 0, 0, 0, 0 }; static struct flock fileRlock = { F_RDLCK, 0, 0, 0, 0, 0 }; static struct flock fileUlock = { F_UNLCK, 0, 0, 0, 0, 0 }; #endif #ifdef AFS_HPUX_ENV static struct flock fileWlock = { F_WRLCK, 0, 0, 0, 0 }; static struct flock fileRlock = { F_RDLCK, 0, 0, 0, 0 }; static struct flock fileUlock = { F_UNLCK, 0, 0, 0, 0 }; #endif #ifndef EOF #define EOF (-1) #endif /* the following routines aren't static anymore on behalf of the kerberos IV * compatibility library built in subtree krb. */ int afs_tf_init(char *, int); int afs_tf_get_pname(char *); int afs_tf_get_pinst(char *); int afs_tf_get_cred(struct ktc_principal *, struct ktc_token *); int afs_tf_save_cred(struct ktc_principal *, struct ktc_token *, struct ktc_principal *); int afs_tf_close(void); int afs_tf_create(char *, char *); int afs_tf_dest_tkt(void); static void ktc_LocalCell(void); #endif /* AFS_KERBEROS_ENV */ #ifdef AFS_DUX40_ENV #define PIOCTL afs_pioctl #elif defined(UKERNEL) #define PIOCTL(A,B,C,D) call_syscall(AFSCALL_PIOCTL,A,B,C,D) #else #define PIOCTL pioctl #endif #ifdef KERNEL_KTC_COMPAT #ifndef KTC_SYSCALL #define KTC_SYSCALL 32 #endif /* Kernel call opcode definitions */ #define KTC_OPCODE_BASE 4300 #define KTC_NO_OP (0+KTC_OPCODE_BASE) #define KTC_SETTOKEN_OP (1+KTC_OPCODE_BASE) #define KTC_GETTOKEN_OP (2+KTC_OPCODE_BASE) #define KTC_LISTTOKENS_OP (3+KTC_OPCODE_BASE) #define KTC_FORGETTOKEN_OP (4+KTC_OPCODE_BASE) #define KTC_FORGETALLTOKENS_OP (5+KTC_OPCODE_BASE) #define KTC_STATUS_OP (6+KTC_OPCODE_BASE) #define KTC_GC_OP (7+KTC_OPCODE_BASE) #define KTC_INTERFACE_VERSION 3 /* We have to determine if the kernel supports the ktc system call. To do so * we attempt to execute its noop function. If this is successful we use the * kernel calls in the future otherwise we let the old code run. */ /* To safely check to see whether a system call exists we have to intercept the * SIGSYS signal which is caused by executing a non-existant system call. If * it is ignored the syscall routine returns EINVAL. The SIGSYS is reset to * its old value after the return from syscall. */ static int kernelKTC = 0; #ifdef AFS_DECOSF_ENV /* * SIGSYS semantics are broken on Dec AXP OSF/1 v1.2 systems. You need * to ignore SIGTRAP too. It is claimed to be fixed under v1.3, but... */ #define CHECK_KERNEL \ if (kernelKTC == 0) { \ int code, ecode; \ int (*old)(); \ int (*old_t)(); \ old = (int (*)())signal(SIGSYS, SIG_IGN); \ old_t = (int (*)())signal(SIGTRAP, SIG_IGN); \ code = syscall (KTC_SYSCALL, KTC_NO_OP, 0,0,0,0,0); \ ecode = errno; \ signal(SIGSYS, old); \ signal(SIGTRAP, old_t); \ if (code == 0) kernelKTC = 1; \ else kernelKTC = 2; \ /* printf ("returned from KTC_NO_OP kernelKTC <= %d; code=%d, errno=%d\n", kernelKTC, code, errno); */\ } #else /* AFS_DECOSF_ENV */ #define CHECK_KERNEL \ if (kernelKTC == 0) { \ int code, ecode; \ int (*old)(); \ old = (int (*)())signal(SIGSYS, SIG_IGN); \ code = syscall (KTC_SYSCALL, KTC_NO_OP, 0,0,0,0,0); \ ecode = errno; \ signal(SIGSYS, old); \ if (code == 0) kernelKTC = 1; \ else kernelKTC = 2; \ /* printf ("returned from KTC_NO_OP kernelKTC <= %d; code=%d, errno=%d\n", kernelKTC, code, errno); */\ } #endif /* AFS_DECOSF_ENV */ #define TRY_KERNEL(cmd,a1,a2,a3,a4) \ { CHECK_KERNEL; \ if (kernelKTC == 1) \ return syscall (KTC_SYSCALL, cmd, \ KTC_INTERFACE_VERSION, a1,a2,a3,a4); \ } #else #define TRY_KERNEL(cmd,a1,a2,a3,a4) #endif /* KERNEL_KTC_COMPAT */ #if !defined(UKERNEL) /* this is a structure used to communicate with the afs cache mgr, but is * otherwise irrelevant */ struct ClearToken { afs_int32 AuthHandle; char HandShakeKey[8]; afs_int32 ViceId; afs_int32 BeginTimestamp; afs_int32 EndTimestamp; }; #endif /* !defined(UKERNEL) */ #define MAXLOCALTOKENS 4 static struct { int valid; struct ktc_principal server; struct ktc_principal client; struct ktc_token token; } local_tokens[MAXLOCALTOKENS] = { { 0}, { 0}, { 0}, { 0}}; /* new interface routines to the ticket cache. Only handle afs service right * now. */ static int NewSetToken(struct ktc_principal *aserver, struct ktc_token *atoken, struct ktc_principal *aclient, afs_int32 flags) { TRY_KERNEL(KTC_SETTOKEN_OP, aserver, aclient, atoken, sizeof(struct ktc_token)); /* no kernel ticket cache */ return EINVAL; } #define MAXPIOCTLTOKENLEN \ (3*sizeof(afs_int32)+MAXKTCTICKETLEN+sizeof(struct ClearToken)+MAXKTCREALMLEN) static int OldSetToken(struct ktc_principal *aserver, struct ktc_token *atoken, struct ktc_principal *aclient, afs_int32 flags) { struct ViceIoctl iob; char tbuffer[MAXPIOCTLTOKENLEN]; register char *tp; struct ClearToken ct; register afs_int32 code; afs_int32 temp; if (strcmp(aserver->name, "afs") != 0) { int found = -1; int i; for (i = 0; i < MAXLOCALTOKENS; i++) if (local_tokens[i].valid) { if ((strcmp(local_tokens[i].server.name, aserver->name) == 0) && (strcmp (local_tokens[i].server.instance, aserver->instance) == 0) && (strcmp(local_tokens[i].server.cell, aserver->cell) == 0)) { found = i; /* replace existing entry */ break; } else /* valid, but no match */ ; } else found = i; /* remember this empty slot */ if (found == -1) return KTC_NOENT; memcpy(&local_tokens[found].token, atoken, sizeof(struct ktc_token)); local_tokens[found].server = *aserver; local_tokens[found].client = *aclient; local_tokens[found].valid = 1; return 0; } tp = tbuffer; /* start copying here */ if ((atoken->ticketLen < MINKTCTICKETLEN) || (atoken->ticketLen > MAXKTCTICKETLEN)) return KTC_TOOBIG; memcpy(tp, &atoken->ticketLen, sizeof(afs_int32)); /* copy in ticket length */ tp += sizeof(afs_int32); memcpy(tp, atoken->ticket, atoken->ticketLen); /* copy in ticket */ tp += atoken->ticketLen; /* next, copy in the "clear token", describing who we are */ ct.AuthHandle = atoken->kvno; /* hide auth handle here */ memcpy(ct.HandShakeKey, &atoken->sessionKey, 8); ct.BeginTimestamp = atoken->startTime; ct.EndTimestamp = atoken->endTime; if (ct.BeginTimestamp == 0) ct.BeginTimestamp = 1; if ((strlen(aclient->name) > strlen("AFS ID ")) && (aclient->instance[0] == 0)) { int sign = 1; afs_int32 viceId = 0; char *cp = aclient->name + strlen("AFS ID "); if (*cp == '-') { sign = -1; cp++; } while (*cp) { if (isdigit(*cp)) viceId = viceId * 10 + (int)(*cp - '0'); else goto not_vice_id; cp++; } ct.ViceId = viceId * sign; /* OK to let any value here? */ if (((ct.EndTimestamp - ct.BeginTimestamp) & 1) == 0) ct.BeginTimestamp++; /* force lifetime to be odd */ } else { not_vice_id: ct.ViceId = getuid(); /* wrong, but works in primary cell */ if (((ct.EndTimestamp - ct.BeginTimestamp) & 1) == 1) ct.BeginTimestamp++; /* force lifetime to be even */ } #ifdef UKERNEL /* * Information needed by the user space cache manager */ u.u_expiration = ct.EndTimestamp; u.u_viceid = ct.ViceId; #endif temp = sizeof(struct ClearToken); memcpy(tp, &temp, sizeof(afs_int32)); tp += sizeof(afs_int32); memcpy(tp, &ct, sizeof(struct ClearToken)); tp += sizeof(struct ClearToken); /* next copy in primary flag */ temp = 0; /* * The following means that setpag will happen inside afs just before * the authentication to prevent the setpag/klog race condition. * * The following means that setpag will affect the parent process as * well as the current process. */ if (flags & AFS_SETTOK_SETPAG) temp |= 0x8000; memcpy(tp, &temp, sizeof(afs_int32)); tp += sizeof(afs_int32); /* finally copy in the cell name */ temp = strlen(aserver->cell); if (temp >= MAXKTCREALMLEN) return KTC_TOOBIG; strcpy(tp, aserver->cell); tp += temp + 1; /* now setup for the pioctl */ iob.in = tbuffer; iob.in_size = tp - tbuffer; iob.out = tbuffer; iob.out_size = sizeof(tbuffer); #if defined(NO_AFS_CLIENT) { int fd; /* DEBUG */ char *tkfile; if ((tkfile = getenv("TKTFILE")) && ((fd = open(tkfile, O_WRONLY | O_APPEND | O_TRUNC | O_CREAT, 0644)) >= 0)) { printf("Writing ticket to: %s\n", tkfile); code = (write(fd, iob.in, iob.in_size) != iob.in_size); close(fd); } else code = KTC_PIOCTLFAIL; } #else /* NO_AFS_CLIENT */ code = PIOCTL(0, VIOCSETTOK, &iob, 0); #endif /* NO_AFS_CLIENT */ if (code) return KTC_PIOCTLFAIL; return 0; } int ktc_SetToken(struct ktc_principal *aserver, struct ktc_token *atoken, struct ktc_principal *aclient, afs_int32 flags) { int ncode, ocode; LOCK_GLOBAL_MUTEX; #ifdef AFS_KERBEROS_ENV if (!lcell[0]) ktc_LocalCell(); if ( /*!strcmp(aclient->cell, lcell) && this would only store local creds */ (strcmp(aserver->name, "AuthServer") || strcmp(aserver->instance, "Admin"))) { if (strcmp(aserver->name, "krbtgt") == 0) { static char lrealm[MAXKTCREALMLEN]; if (!lrealm[0]) ucstring(lrealm, lcell, MAXKTCREALMLEN); if (strcmp(aserver->instance, lrealm) == 0) { afs_tf_create(aclient->name, aclient->instance); } } ncode = afs_tf_init(ktc_tkt_string(), W_TKT_FIL); if (ncode == NO_TKT_FIL) { (void)afs_tf_create(aclient->name, aclient->instance); ncode = afs_tf_init(ktc_tkt_string(), W_TKT_FIL); } if (!ncode) { afs_tf_save_cred(aserver, atoken, aclient); } afs_tf_close(); #ifdef NO_AFS_CLIENT UNLOCK_GLOBAL_MUTEX; return ncode; #endif /* NO_AFS_CLIENT */ } #endif #ifndef NO_AFS_CLIENT ncode = NewSetToken(aserver, atoken, aclient, flags); if (ncode || /* new style failed */ (strcmp(aserver->name, "afs") == 0)) { /* for afs tokens do both */ ocode = OldSetToken(aserver, atoken, aclient, flags); } else ocode = 0; if (ncode && ocode) { UNLOCK_GLOBAL_MUTEX; if (ocode == -1) ocode = errno; else if (ocode == KTC_PIOCTLFAIL) ocode = errno; if (ocode == ESRCH) return KTC_NOCELL; if (ocode == EINVAL) return KTC_NOPIOCTL; if (ocode == EIO) return KTC_NOCM; return KTC_PIOCTLFAIL; } #endif /* NO_AFS_CLIENT */ UNLOCK_GLOBAL_MUTEX; return 0; } /* get token, given server we need and token buffer. aclient will eventually * be set to our identity to the server. */ int ktc_GetToken(struct ktc_principal *aserver, struct ktc_token *atoken, int atokenLen, struct ktc_principal *aclient) { struct ViceIoctl iob; char tbuffer[MAXPIOCTLTOKENLEN]; register afs_int32 code; int index; char *stp, *cellp; /* secret token ptr */ struct ClearToken ct; register char *tp; afs_int32 temp; int maxLen; /* biggest ticket we can copy */ int tktLen; /* server ticket length */ #ifdef AFS_KERBEROS_ENV char found = 0; #endif LOCK_GLOBAL_MUTEX; #ifndef NO_AFS_CLIENT TRY_KERNEL(KTC_GETTOKEN_OP, aserver, aclient, atoken, atokenLen); #endif /* NO_AFS_CLIENT */ #ifdef AFS_KERBEROS_ENV if (!lcell[0]) ktc_LocalCell(); #endif #ifndef NO_AFS_CLIENT if (strcmp(aserver->name, "afs") != 0) #endif /* NO_AFS_CLIENT */ { int i; /* try the local tokens */ for (i = 0; i < MAXLOCALTOKENS; i++) if (local_tokens[i].valid && (strcmp(local_tokens[i].server.name, aserver->name) == 0) && (strcmp(local_tokens[i].server.instance, aserver->instance) == 0) && (strcmp(local_tokens[i].server.cell, aserver->cell) == 0)) { memcpy(atoken, &local_tokens[i].token, min(atokenLen, sizeof(struct ktc_token))); if (aclient) *aclient = local_tokens[i].client; UNLOCK_GLOBAL_MUTEX; return 0; } #ifdef AFS_KERBEROS_ENV if (!afs_tf_init(ktc_tkt_string(), R_TKT_FIL)) { if (aclient) { if (!afs_tf_get_pname(aclient->name) && !afs_tf_get_pinst(aclient->instance)) found = 1; } else { char tmpstring[MAXHOSTCHARS]; afs_tf_get_pname(tmpstring); afs_tf_get_pinst(tmpstring); found = 1; } } if (found) { struct ktc_principal cprincipal; struct ktc_token ctoken; while (!afs_tf_get_cred(&cprincipal, &ctoken)) { if (strcmp(cprincipal.name, aserver->name) == 0 && strcmp(cprincipal.instance, aserver->instance) == 0 && strcmp(cprincipal.cell, aserver->cell) == 0) { if (aclient) strcpy(aclient->cell, lcell); memcpy(atoken, &ctoken, min(atokenLen, sizeof(struct ktc_token))); afs_tf_close(); UNLOCK_GLOBAL_MUTEX; return 0; } } } afs_tf_close(); #endif UNLOCK_GLOBAL_MUTEX; return KTC_NOENT; } #ifndef NO_AFS_CLIENT for (index = 0; index < 200; index++) { /* sanity check in case pioctl fails */ iob.in = (char *)&index; iob.in_size = sizeof(afs_int32); iob.out = tbuffer; iob.out_size = sizeof(tbuffer); code = PIOCTL(0, VIOCGETTOK, &iob, 0); if (code) { /* failed to retrieve specified token */ if (code < 0 && errno == EDOM) { UNLOCK_GLOBAL_MUTEX; return KTC_NOENT; } } else { /* token retrieved; parse buffer */ tp = tbuffer; /* get ticket length */ memcpy(&temp, tp, sizeof(afs_int32)); tktLen = temp; tp += sizeof(afs_int32); /* remember where ticket is and skip over it */ stp = tp; tp += tktLen; /* get size of clear token and verify */ memcpy(&temp, tp, sizeof(afs_int32)); if (temp != sizeof(struct ClearToken)) { UNLOCK_GLOBAL_MUTEX; return KTC_ERROR; } tp += sizeof(afs_int32); /* copy clear token */ memcpy(&ct, tp, temp); tp += temp; /* skip over primary flag */ tp += sizeof(afs_int32); /* remember where cell name is */ cellp = tp; if ((strcmp(cellp, aserver->cell) == 0) #ifdef AFS_KERBEROS_ENV || (*aserver->cell == '\0' && strcmp(cellp, lcell) == 0) #endif ) { /* got token for cell; check that it will fit */ maxLen = atokenLen - sizeof(struct ktc_token) + MAXKTCTICKETLEN; if (maxLen < tktLen) { UNLOCK_GLOBAL_MUTEX; return KTC_TOOBIG; } /* set return values */ memcpy(atoken->ticket, stp, tktLen); atoken->startTime = ct.BeginTimestamp; atoken->endTime = ct.EndTimestamp; if (ct.AuthHandle == -1) { ct.AuthHandle = 999; } atoken->kvno = ct.AuthHandle; memcpy(&atoken->sessionKey, ct.HandShakeKey, sizeof(struct ktc_encryptionKey)); atoken->ticketLen = tktLen; if (aclient) { strcpy(aclient->cell, cellp); aclient->instance[0] = 0; if ((atoken->kvno == 999) || /* old style bcrypt ticket */ (ct.BeginTimestamp && /* new w/ prserver lookup */ (((ct.EndTimestamp - ct.BeginTimestamp) & 1) == 1))) { sprintf(aclient->name, "AFS ID %d", ct.ViceId); } else { sprintf(aclient->name, "Unix UID %d", ct.ViceId); } } UNLOCK_GLOBAL_MUTEX; return 0; } } } #endif /* NO_AFS_CLIENT */ UNLOCK_GLOBAL_MUTEX; if ((code < 0) && (errno == EINVAL)) return KTC_NOPIOCTL; return KTC_PIOCTLFAIL; /* probable cause */ } /* * Forget tokens for this server and the calling user. * NOT IMPLEMENTED YET! */ #ifndef NO_AFS_CLIENT int ktc_ForgetToken(struct ktc_principal *aserver) { int rc; LOCK_GLOBAL_MUTEX; TRY_KERNEL(KTC_FORGETTOKEN_OP, aserver, 0, 0, 0); rc = ktc_ForgetAllTokens(); /* bogus, but better */ UNLOCK_GLOBAL_MUTEX; return rc; } #endif /* NO_AFS_CLIENT */ /* ktc_ListTokens - list all tokens. start aprevIndex at 0, it returns the * next rock in (*aindex). (*aserver) is set to the relevant ticket on * success. */ int ktc_ListTokens(int aprevIndex, int *aindex, struct ktc_principal *aserver) { struct ViceIoctl iob; char tbuffer[MAXPIOCTLTOKENLEN]; register afs_int32 code; register char *tp; afs_int32 temp, index; memset(tbuffer, 0, sizeof(tbuffer)); LOCK_GLOBAL_MUTEX; #ifndef NO_AFS_CLIENT TRY_KERNEL(KTC_LISTTOKENS_OP, aserver, aprevIndex, aindex, 0); #endif /* NO_AFS_CLIENT */ index = aprevIndex; #ifdef NO_AFS_CLIENT if (index < 214) index = 214; #endif /* NO_AFS_CLIENT */ #ifdef AFS_KERBEROS_ENV if (index >= 214) { int i; struct ktc_principal cprincipal; struct ktc_token ctoken; if (afs_tf_init(ktc_tkt_string(), R_TKT_FIL) || afs_tf_get_pname(tbuffer) || afs_tf_get_pinst(tbuffer)) { afs_tf_close(); UNLOCK_GLOBAL_MUTEX; return KTC_NOENT; } for (i = 214; i < index; i++) { if (afs_tf_get_cred(&cprincipal, &ctoken)) { afs_tf_close(); UNLOCK_GLOBAL_MUTEX; return KTC_NOENT; } } again: if (afs_tf_get_cred(&cprincipal, &ctoken)) { afs_tf_close(); UNLOCK_GLOBAL_MUTEX; return KTC_NOENT; } index++; #ifndef NO_AFS_CLIENT if (!strcmp(cprincipal.name, "afs") && cprincipal.instance[0] == 0) { goto again; } #endif /* NO_AFS_CLIENT */ for (i = 0; i < MAXLOCALTOKENS; i++) { if (!strcmp(cprincipal.name, local_tokens[i].server.name) && !strcmp(cprincipal.instance, local_tokens[i].server.instance) && !strcmp(cprincipal.cell, local_tokens[i].server.cell)) { goto again; } } *aserver = cprincipal; *aindex = index; afs_tf_close(); UNLOCK_GLOBAL_MUTEX; return 0; } #endif #ifndef NO_AFS_CLIENT if (index >= 123) { /* special hack for returning TCS */ while (index - 123 < MAXLOCALTOKENS) { if (local_tokens[index - 123].valid) { *aserver = local_tokens[index - 123].server; *aindex = index + 1; UNLOCK_GLOBAL_MUTEX; return 0; } index++; } UNLOCK_GLOBAL_MUTEX; #ifdef AFS_KERBEROS_ENV return ktc_ListTokens(214, aindex, aserver); #else return KTC_NOENT; #endif } /* get tokens from the kernel */ while (index < 200) { /* sanity check in case pioctl fails */ iob.in = (char *)&index; iob.in_size = sizeof(afs_int32); iob.out = tbuffer; iob.out_size = sizeof(tbuffer); code = PIOCTL(0, VIOCGETTOK, &iob, 0); if (code < 0 && errno == EDOM) { if (index < 123) { int rc; rc = ktc_ListTokens(123, aindex, aserver); UNLOCK_GLOBAL_MUTEX; return rc; } else { UNLOCK_GLOBAL_MUTEX; return KTC_NOENT; } } if (code == 0) break; /* got a ticket */ /* otherwise we should skip this ticket slot */ index++; } if (code < 0) { UNLOCK_GLOBAL_MUTEX; if (errno == EINVAL) return KTC_NOPIOCTL; return KTC_PIOCTLFAIL; } /* parse buffer */ tp = tbuffer; /* next iterator determined by earlier loop */ *aindex = index + 1; memcpy(&temp, tp, sizeof(afs_int32)); /* get size of secret token */ tp += sizeof(afs_int32); tp += temp; /* skip ticket for now */ memcpy(&temp, tp, sizeof(afs_int32)); /* get size of clear token */ if (temp != sizeof(struct ClearToken)) { UNLOCK_GLOBAL_MUTEX; return KTC_ERROR; } tp += sizeof(afs_int32); /* skip length */ tp += temp; /* skip clear token itself */ tp += sizeof(afs_int32); /* skip primary flag */ /* tp now points to the cell name */ strcpy(aserver->cell, tp); aserver->instance[0] = 0; strcpy(aserver->name, "afs"); #endif /* NO_AFS_CLIENT */ UNLOCK_GLOBAL_MUTEX; return 0; } /* discard all tokens from this user's cache */ static int NewForgetAll(void) { #ifndef NO_AFS_CLIENT TRY_KERNEL(KTC_FORGETALLTOKENS_OP, 0, 0, 0, 0); #endif /* NO_AFS_CLIENT */ return EINVAL; } static int OldForgetAll(void) { struct ViceIoctl iob; register afs_int32 code; int i; for (i = 0; i < MAXLOCALTOKENS; i++) local_tokens[i].valid = 0; iob.in = 0; iob.in_size = 0; iob.out = 0; iob.out_size = 0; #ifndef NO_AFS_CLIENT code = PIOCTL(0, VIOCUNPAG, &iob, 0); if (code) return KTC_PIOCTLFAIL; #endif /* NO_AFS_CLIENT */ return 0; } int ktc_ForgetAllTokens(void) { int ncode, ocode; LOCK_GLOBAL_MUTEX; #ifdef AFS_KERBEROS_ENV (void)afs_tf_dest_tkt(); #endif ncode = NewForgetAll(); ocode = OldForgetAll(); if (ncode && ocode) { if (ocode == -1) ocode = errno; else if (ocode == KTC_PIOCTLFAIL) ocode = errno; UNLOCK_GLOBAL_MUTEX; if (ocode == EINVAL) return KTC_NOPIOCTL; return KTC_PIOCTLFAIL; } UNLOCK_GLOBAL_MUTEX; return 0; } /* ktc_OldPioctl - returns a boolean true if the kernel supports only the old * pioctl interface for delivering AFS tickets to the cache manager. */ int ktc_OldPioctl(void) { int rc; LOCK_GLOBAL_MUTEX; #ifdef KERNEL_KTC_COMPAT CHECK_KERNEL; rc = (kernelKTC != 1); /* old style interface */ #else rc = 1; #endif UNLOCK_GLOBAL_MUTEX; return rc; } #ifdef AFS_KERBEROS_ENV /* * Copyright 1987, 1988 by the Massachusetts Institute of Technology. * * For copying and distribution information, please see the file * . */ #if 0 #include #include #include #include #include #include #endif #define TOO_BIG -1 #define TF_LCK_RETRY ((unsigned)2) /* seconds to sleep before * retry if ticket file is * locked */ /* * fd must be initialized to something that won't ever occur as a real * file descriptor. Since open(2) returns only non-negative numbers as * valid file descriptors, and afs_tf_init always stuffs the return value * from open in here even if it is an error flag, we must * a. Initialize fd to a negative number, to indicate that it is * not initially valid. * b. When checking for a valid fd, assume that negative values * are invalid (ie. when deciding whether afs_tf_init has been * called.) * c. In tf_close, be sure it gets reinitialized to a negative * number. */ static int fd = -1; static int curpos; /* Position in tfbfr */ static int lastpos; /* End of tfbfr */ static char tfbfr[BUFSIZ]; /* Buffer for ticket data */ static int tf_gets(char *, int); static int tf_read(char *, int); /* * This file contains routines for manipulating the ticket cache file. * * The ticket file is in the following format: * * principal's name (null-terminated string) * principal's instance (null-terminated string) * CREDENTIAL_1 * CREDENTIAL_2 * ... * CREDENTIAL_n * EOF * * Where "CREDENTIAL_x" consists of the following fixed-length * fields from the CREDENTIALS structure (see "krb.h"): * * char service[MAXKTCNAMELEN] * char instance[MAXKTCNAMELEN] * char realm[REALM_SZ] * C_Block session * int lifetime * int kvno * KTEXT_ST ticket_st * afs_int32 issue_date * * Short description of routines: * * afs_tf_init() opens the ticket file and locks it. * * afs_tf_get_pname() returns the principal's name. * * afs_tf_get_pinst() returns the principal's instance (may be null). * * afs_tf_get_cred() returns the next CREDENTIALS record. * * afs_tf_save_cred() appends a new CREDENTIAL record to the ticket file. * * afs_tf_close() closes the ticket file and releases the lock. * * tf_gets() returns the next null-terminated string. It's an internal * routine used by afs_tf_get_pname(), afs_tf_get_pinst(), and * afs_tf_get_cred(). * * tf_read() reads a given number of bytes. It's an internal routine * used by afs_tf_get_cred(). */ /* * afs_tf_init() should be called before the other ticket file routines. * It takes the name of the ticket file to use, "tf_name", and a * read/write flag "rw" as arguments. * * It tries to open the ticket file, checks the mode, and if everything * is okay, locks the file. If it's opened for reading, the lock is * shared. If it's opened for writing, the lock is exclusive. * * Returns 0 if all went well, otherwise one of the following: * * NO_TKT_FIL - file wasn't there * TKT_FIL_ACC - file was in wrong mode, etc. * TKT_FIL_LCK - couldn't lock the file, even after a retry */ int afs_tf_init(char *tf_name, int rw) { int wflag; int me; struct stat stat_buf; switch (rw) { case R_TKT_FIL: wflag = 0; break; case W_TKT_FIL: wflag = 1; break; default: return TKT_FIL_ACC; } if (lstat(tf_name, &stat_buf) < 0) switch (errno) { case ENOENT: return NO_TKT_FIL; default: return TKT_FIL_ACC; } me = getuid(); if ((stat_buf.st_uid != me && me != 0) || ((stat_buf.st_mode & S_IFMT) != S_IFREG)) return TKT_FIL_ACC; /* * If "wflag" is set, open the ticket file in append-writeonly mode * and lock the ticket file in exclusive mode. If unable to lock * the file, sleep and try again. If we fail again, return with the * proper error message. */ curpos = sizeof(tfbfr); if (wflag) { fd = open(tf_name, O_RDWR, 0600); if (fd < 0) { return TKT_FIL_ACC; } #if defined(AFS_AIX_ENV) || defined(AFS_HPUX_ENV) || defined(AFS_SUN5_ENV) if (fcntl(fd, F_SETLK, &fileWlock) == -1) { sleep(TF_LCK_RETRY); if (fcntl(fd, F_SETLK, &fileWlock) == -1) { #else if (flock(fd, LOCK_EX | LOCK_NB) < 0) { sleep(TF_LCK_RETRY); if (flock(fd, LOCK_EX | LOCK_NB) < 0) { #endif (void)close(fd); fd = -1; return TKT_FIL_LCK; } } return 0; } /* * Otherwise "wflag" is not set and the ticket file should be opened * for read-only operations and locked for shared access. */ fd = open(tf_name, O_RDONLY, 0600); if (fd < 0) { return TKT_FIL_ACC; } #if defined(AFS_AIX_ENV) || defined(AFS_HPUX_ENV) || defined(AFS_SUN5_ENV) if (fcntl(fd, F_SETLK, &fileRlock) == -1) { sleep(TF_LCK_RETRY); if (fcntl(fd, F_SETLK, &fileRlock) == -1) { #else if (flock(fd, LOCK_SH | LOCK_NB) < 0) { sleep(TF_LCK_RETRY); if (flock(fd, LOCK_SH | LOCK_NB) < 0) { #endif (void)close(fd); fd = -1; return TKT_FIL_LCK; } } return 0; } /* * afs_tf_get_pname() reads the principal's name from the ticket file. It * should only be called after afs_tf_init() has been called. The * principal's name is filled into the "p" parameter. If all goes well, * 0 is returned. If afs_tf_init() wasn't called, TKT_FIL_INI is * returned. If the name was null, or EOF was encountered, or the name * was longer than MAXKTCNAMELEN, TKT_FIL_FMT is returned. */ int afs_tf_get_pname(char *p) { if (fd < 0) { return TKT_FIL_INI; } if (tf_gets(p, MAXKTCNAMELEN) < 2) /* can't be just a null */ return TKT_FIL_FMT; return 0; } /* * afs_tf_get_pinst() reads the principal's instance from a ticket file. * It should only be called after afs_tf_init() and afs_tf_get_pname() have * been called. The instance is filled into the "inst" parameter. If all * goes well, 0 is returned. If afs_tf_init() wasn't called, * TKT_FIL_INI is returned. If EOF was encountered, or the instance * was longer than MAXKTCNAMELEN, TKT_FIL_FMT is returned. Note that the * instance may be null. */ int afs_tf_get_pinst(char *inst) { if (fd < 0) { return TKT_FIL_INI; } if (tf_gets(inst, MAXKTCNAMELEN) < 1) return TKT_FIL_FMT; return 0; } /* * afs_tf_get_cred() reads a CREDENTIALS record from a ticket file and fills * in the given structure "c". It should only be called after afs_tf_init(), * afs_tf_get_pname(), and afs_tf_get_pinst() have been called. If all goes * well, 0 is returned. Possible error codes are: * * TKT_FIL_INI - afs_tf_init wasn't called first * TKT_FIL_FMT - bad format * EOF - end of file encountered */ int afs_tf_get_cred(struct ktc_principal *principal, struct ktc_token *token) { int k_errno; int kvno, lifetime; long mit_compat; /* MIT Kerberos 5 with Krb4 uses a "long" for issue_date */ if (fd < 0) { return TKT_FIL_INI; } if ((k_errno = tf_gets(principal->name, MAXKTCNAMELEN)) < 2) switch (k_errno) { case TOO_BIG: case 1: /* can't be just a null */ return TKT_FIL_FMT; case 0: return EOF; } if ((k_errno = tf_gets(principal->instance, MAXKTCNAMELEN)) < 1) switch (k_errno) { case TOO_BIG: return TKT_FIL_FMT; case 0: return EOF; } if ((k_errno = tf_gets(principal->cell, MAXKTCREALMLEN)) < 2) switch (k_errno) { case TOO_BIG: case 1: /* can't be just a null */ return TKT_FIL_FMT; case 0: return EOF; } lcstring(principal->cell, principal->cell, MAXKTCREALMLEN); if (tf_read((char *)&(token->sessionKey), 8) < 1 || tf_read((char *)&(lifetime), sizeof(lifetime)) < 1 || tf_read((char *)&(kvno), sizeof(kvno)) < 1 || tf_read((char *)&(token->ticketLen), sizeof(token->ticketLen)) < 1 || /* don't try to read a silly amount into ticket->dat */ token->ticketLen > MAXKTCTICKETLEN || tf_read((char *)(token->ticket), token->ticketLen) < 1 || tf_read((char *)&mit_compat, sizeof(mit_compat)) < 1) { return TKT_FIL_FMT; } token->startTime = mit_compat; token->endTime = life_to_time(token->startTime, lifetime); token->kvno = kvno; return 0; } /* * tf_close() closes the ticket file and sets "fd" to -1. If "fd" is * not a valid file descriptor, it just returns. It also clears the * buffer used to read tickets. * * The return value is not defined. */ int afs_tf_close(void) { if (!(fd < 0)) { #if defined(AFS_AIX_ENV) || defined(AFS_HPUX_ENV) || defined(AFS_SUN5_ENV) (void)fcntl(fd, F_SETLK, &fileUlock); #else (void)flock(fd, LOCK_UN); #endif (void)close(fd); fd = -1; /* see declaration of fd above */ } memset(tfbfr, 0, sizeof(tfbfr)); return 0; } /* * tf_gets() is an internal routine. It takes a string "s" and a count * "n", and reads from the file until either it has read "n" characters, * or until it reads a null byte. When finished, what has been read exists * in "s". * * Possible return values are: * * n the number of bytes read (including null terminator) * when all goes well * * 0 end of file or read error * * TOO_BIG if "count" characters are read and no null is * encountered. This is an indication that the ticket * file is seriously ill. */ static int tf_gets(register char *s, int n) { register int count; if (fd < 0) { return TKT_FIL_INI; } for (count = n - 1; count > 0; --count) { if (curpos >= sizeof(tfbfr)) { lastpos = read(fd, tfbfr, sizeof(tfbfr)); curpos = 0; } if (curpos == lastpos) { return 0; } *s = tfbfr[curpos++]; if (*s++ == '\0') return (n - count); } return TOO_BIG; } /* * tf_read() is an internal routine. It takes a string "s" and a count * "n", and reads from the file until "n" bytes have been read. When * finished, what has been read exists in "s". * * Possible return values are: * * n the number of bytes read when all goes well * * 0 on end of file or read error */ static int tf_read(register char *s, register int n) { register int count; for (count = n; count > 0; --count) { if (curpos >= sizeof(tfbfr)) { lastpos = read(fd, tfbfr, sizeof(tfbfr)); curpos = 0; } if (curpos == lastpos) { return 0; } *s++ = tfbfr[curpos++]; } return n; } /* * afs_tf_save_cred() appends an incoming ticket to the end of the ticket * file. You must call afs_tf_init() before calling afs_tf_save_cred(). * * The "service", "instance", and "realm" arguments specify the * server's name; "aticket" contains the credential. * * Returns 0 if all goes well, TKT_FIL_INI if afs_tf_init() wasn't * called previously, and KFAILURE for anything else that went wrong. */ int afs_tf_save_cred(struct ktc_principal *aserver, struct ktc_token *atoken, struct ktc_principal *aclient) { char realm[MAXKTCREALMLEN + 1]; char junk[MAXKTCNAMELEN]; struct ktc_principal principal; struct ktc_token token; int status; off_t start; int lifetime, kvno; int count; /* count for write */ long mit_compat; /* MIT Kerberos 5 with Krb4 uses a "long" for issue_date */ if (fd < 0) { /* fd is ticket file as set by afs_tf_init */ return TKT_FIL_INI; } ucstring(realm, aserver->cell, MAXKTCREALMLEN); realm[MAXKTCREALMLEN] = '\0'; /* Look for a duplicate ticket */ (void)lseek(fd, (off_t) 0L, 0); curpos = sizeof(tfbfr); if (afs_tf_get_pname(junk) || strcmp(junk, aclient->name) || afs_tf_get_pinst(junk) || strcmp(junk, aclient->instance)) goto bad; do { start = lseek(fd, (off_t) 0L, 1) - lastpos + curpos; status = afs_tf_get_cred(&principal, &token); } while (status == 0 && (strcmp(aserver->name, principal.name) != 0 || strcmp(aserver->instance, principal.instance) != 0 || strcmp(aserver->cell, principal.cell) != 0)); /* * Two tickets for the same user authenticating to the same service * should be the same length, but we check here just to make sure. */ if (status == 0 && token.ticketLen != atoken->ticketLen) return KFAILURE; if (status && status != EOF) return status; /* Position over the credential we just matched (or the EOF) */ lseek(fd, start, 0); curpos = lastpos = sizeof(tfbfr); /* Write the ticket and associated data */ /* Service */ count = strlen(aserver->name) + 1; if (write(fd, aserver->name, count) != count) goto bad; /* Instance */ count = strlen(aserver->instance) + 1; if (write(fd, aserver->instance, count) != count) goto bad; /* Realm */ count = strlen(realm) + 1; if (write(fd, realm, count) != count) goto bad; /* Session key */ if (write(fd, (char *)&atoken->sessionKey, 8) != 8) goto bad; /* Lifetime */ lifetime = time_to_life(atoken->startTime, atoken->endTime); if (write(fd, (char *)&lifetime, sizeof(int)) != sizeof(int)) goto bad; /* Key vno */ kvno = atoken->kvno; if (write(fd, (char *)&kvno, sizeof(int)) != sizeof(int)) goto bad; /* Tkt length */ if (write(fd, (char *)&(atoken->ticketLen), sizeof(int)) != sizeof(int)) goto bad; /* Ticket */ count = atoken->ticketLen; if (write(fd, atoken->ticket, count) != count) goto bad; /* Issue date */ mit_compat = atoken->startTime; if (write(fd, (char *)&mit_compat, sizeof(mit_compat)) != sizeof(mit_compat)) goto bad; /* Actually, we should check each write for success */ return (0); bad: return (KFAILURE); } /* * Copyright 1985, 1986, 1987, 1988 by the Massachusetts Institute * of Technology. * * For copying and distribution information, please see the file * . */ /* * This routine is used to generate the name of the file that holds * the user's cache of server tickets and associated session keys. * * If it is set, krb_ticket_string contains the ticket file name. * Otherwise, the filename is constructed as follows: * * If it is set, the environment variable "KRBTKFILE" will be used as * the ticket file name. Otherwise TKT_ROOT (defined in "krb.h") and * the user's uid are concatenated to produce the ticket file name * (e.g., "/tmp/tkt123"). A pointer to the string containing the ticket * file name is returned. */ static char krb_ticket_string[4096] = ""; char * ktc_tkt_string(void) { return ktc_tkt_string_uid(getuid()); } char * ktc_tkt_string_uid(afs_uint32 uid) { char *env; LOCK_GLOBAL_MUTEX; if (!*krb_ticket_string) { if ((env = getenv("KRBTKFILE"))) { (void)strncpy(krb_ticket_string, env, sizeof(krb_ticket_string) - 1); krb_ticket_string[sizeof(krb_ticket_string) - 1] = '\0'; } else { /* 32 bits of signed integer will always fit in 11 characters * (including the sign), so no need to worry about overflow */ (void)sprintf(krb_ticket_string, "%s%d", TKT_ROOT, uid); } } UNLOCK_GLOBAL_MUTEX; return krb_ticket_string; } /* * This routine is used to set the name of the file that holds the user's * cache of server tickets and associated session keys. * * The value passed in is copied into local storage. * * NOTE: This routine should be called during initialization, before other * Kerberos routines are called; otherwise tkt_string() above may be called * and return an undesired ticket file name until this routine is called. */ void ktc_set_tkt_string(char * val) { LOCK_GLOBAL_MUTEX; (void)strncpy(krb_ticket_string, val, sizeof(krb_ticket_string) - 1); krb_ticket_string[sizeof(krb_ticket_string) - 1] = '\0'; UNLOCK_GLOBAL_MUTEX; return; } /* * tf_create() is used to initialize the ticket store. It creates the * file to contain the tickets and writes the given user's name "pname" * and instance "pinst" in the file. in_tkt() returns KSUCCESS on * success, or KFAILURE if something goes wrong. */ int afs_tf_create(char *pname, char *pinst) { int tktfile; int me, metoo; int count; char *file = ktc_tkt_string(); int fd; register int i; char zerobuf[1024]; struct stat sbuf; me = getuid(); metoo = geteuid(); if (lstat(file, &sbuf) == 0) { if ((sbuf.st_uid != me && me != 0) || ((sbuf.st_mode & S_IFMT) != S_IFREG) || sbuf.st_mode & 077) { return KFAILURE; } /* file already exists, and permissions appear ok, so nuke it */ if ((fd = open(file, O_RDWR, 0)) < 0) goto out; /* can't zero it, but we can still try truncating it */ memset(zerobuf, 0, sizeof(zerobuf)); for (i = 0; i < sbuf.st_size; i += sizeof(zerobuf)) if (write(fd, zerobuf, sizeof(zerobuf)) != sizeof(zerobuf)) { (void)fsync(fd); (void)close(fd); goto out; } (void)fsync(fd); (void)close(fd); } out: /* arrange so the file is owned by the ruid * (swap real & effective uid if necessary). * This isn't a security problem, since the ticket file, if it already * exists, has the right uid (== ruid) and mode. */ if (me != metoo) { if (setreuid(metoo, me) < 0) { return (KFAILURE); } } tktfile = creat(file, 0600); if (me != metoo) { if (setreuid(me, metoo) < 0) { /* can't switch??? fail! */ return (KFAILURE); } } if (tktfile < 0) { return (KFAILURE); } count = strlen(pname) + 1; if (write(tktfile, pname, count) != count) { (void)close(tktfile); return (KFAILURE); } count = strlen(pinst) + 1; if (write(tktfile, pinst, count) != count) { (void)close(tktfile); return (KFAILURE); } (void)close(tktfile); return (KSUCCESS); } /* * dest_tkt() is used to destroy the ticket store upon logout. * If the ticket file does not exist, dest_tkt() returns RET_TKFIL. * Otherwise the function returns 0 on success, KFAILURE on * failure. */ int afs_tf_dest_tkt(void) { char *file = ktc_tkt_string(); int i, fd; struct stat statb; char buf[BUFSIZ]; errno = 0; if (lstat(file, &statb) < 0) goto out; if (!(statb.st_mode & S_IFREG)) goto out; if ((fd = open(file, O_RDWR, 0)) < 0) goto out; memset(buf, 0, BUFSIZ); for (i = 0; i < statb.st_size; i += BUFSIZ) if (write(fd, buf, BUFSIZ) != BUFSIZ) { (void)fsync(fd); (void)close(fd); goto out; } (void)fsync(fd); (void)close(fd); (void)unlink(file); out: if (errno == ENOENT) return RET_TKFIL; else if (errno != 0) return KFAILURE; return 0; } static afs_uint32 curpag(void) { #if defined(AFS_AIX51_ENV) int code = getpagvalue("afs"); if (code < 0 && errno == EINVAL) code = 0; return code; #else gid_t groups[NGROUPS_MAX]; afs_uint32 g0, g1; afs_uint32 h, l, ret; if (getgroups(sizeof groups / sizeof groups[0], groups) < 2) return 0; g0 = groups[0] & 0xffff; g1 = groups[1] & 0xffff; g0 -= 0x3f00; g1 -= 0x3f00; if (g0 < 0xc000 && g1 < 0xc000) { l = ((g0 & 0x3fff) << 14) | (g1 & 0x3fff); h = (g0 >> 14); h = (g1 >> 14) + h + h + h; ret = ((h << 28) | l); /* Additional testing */ if (((ret >> 24) & 0xff) == 'A') return ret; else return -1; } return -1; #endif } int ktc_newpag(void) { extern char **environ; afs_uint32 pag; struct stat sbuf; char fname[256], *prefix = "/ticket/"; int numenv; char **newenv, **senv, **denv; LOCK_GLOBAL_MUTEX; if (stat("/ticket", &sbuf) == -1) { prefix = "/tmp/tkt"; } pag = curpag() & 0xffffffff; if (pag == -1) { sprintf(fname, "%s%d", prefix, getuid()); } else { sprintf(fname, "%sp%ld", prefix, (long int) pag); } ktc_set_tkt_string(fname); for (senv = environ, numenv = 0; *senv; senv++) numenv++; newenv = (char **)malloc((numenv + 2) * sizeof(char *)); for (senv = environ, denv = newenv; *senv; senv++) { if (strncmp(*senv, "KRBTKFILE=", 10) != 0) *denv++ = *senv; } *denv = (char *)malloc(10 + strlen(fname) + 1); strcpy(*denv, "KRBTKFILE="); strcat(*denv, fname); *++denv = 0; environ = newenv; UNLOCK_GLOBAL_MUTEX; return 0; } /* * BLETCH! We have to invoke the entire afsconf package just to * find out what the local cell is. */ static void ktc_LocalCell(void) { int code; struct afsconf_dir *conf; if ((conf = afsconf_Open(AFSDIR_CLIENT_ETC_DIRPATH)) || (conf = afsconf_Open(AFSDIR_SERVER_ETC_DIRPATH))) { code = afsconf_GetLocalCell(conf, lcell, sizeof(lcell)); afsconf_Close(conf); } if (!conf || code) { printf("** Can't determine local cell name!\n"); } } #endif