diff options
author | Jeremy Allison <jra@samba.org> | 2004-06-17 23:07:20 +0000 |
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committer | Gerald (Jerry) Carter <jerry@samba.org> | 2007-10-10 10:51:58 -0500 |
commit | 920034ec3bd9612cc58d9196ac93828010c6c823 (patch) | |
tree | 9753130ddde135b075a9ba386ce627e12cb9ab8c | |
parent | a986d45e98f0ab2e736d9f1852c32e9dcff660d6 (diff) | |
download | samba-920034ec3bd9612cc58d9196ac93828010c6c823.tar.gz samba-920034ec3bd9612cc58d9196ac93828010c6c823.tar.bz2 samba-920034ec3bd9612cc58d9196ac93828010c6c823.zip |
r1182: Partial re-write of keytab code to clean up, remove memory leaks etc. Work in progress !
It seems the krb5 interfaces are so horrible it's impossible to write good error checking
code :-(.
Jeremy.
(This used to be commit 03f8c8bc07c9d8a378a34c271dcc088d17adb342)
-rw-r--r-- | source3/libads/kerberos_keytab.c | 124 |
1 files changed, 77 insertions, 47 deletions
diff --git a/source3/libads/kerberos_keytab.c b/source3/libads/kerberos_keytab.c index 6424f742b9..9fc3410e5c 100644 --- a/source3/libads/kerberos_keytab.c +++ b/source3/libads/kerberos_keytab.c @@ -8,6 +8,7 @@ Copyright (C) Guenther Deschner 2003 Copyright (C) Rakesh Patel 2004 Copyright (C) Dan Perry 2004 + Copyright (C) Jeremy Allison 2004 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -28,37 +29,52 @@ #ifdef HAVE_KRB5 +/********************************************************************** + Converts a name to a fully qalified domain name. +***********************************************************************/ -/* +void name_to_fqdn(fstring fqdn, const char *name) +{ + struct hostent *hp = sys_gethostbyname(name); + if ( hp && hp->h_name && *hp->h_name ) { + DEBUG(10,("name_to_fqdn: lookup for %s -> %s.\n", name, hp->h_name)); + fstrcpy(fqdn,hp->h_name); + } else { + DEBUG(10,("name_to_fqdn: lookup for %s failed.\n", name)); + fstrcpy(fqdn, name); + } +} + +/********************************************************************** Adds a single service principal, i.e. 'host' to the system keytab -*/ +***********************************************************************/ + int ads_keytab_add_entry(const char *srvPrinc, ADS_STRUCT *ads) { - krb5_error_code ret; - krb5_context context; - krb5_keytab keytab; - krb5_kt_cursor cursor; - krb5_keytab_entry entry; - krb5_principal princ; + krb5_error_code ret = 0; + krb5_context context = NULL; + krb5_keytab keytab = NULL; + krb5_kt_cursor cursor = NULL; + krb5_keytab_entry kt_entry; + krb5_principal princ = NULL; krb5_data password; krb5_enctype *enctypes = NULL; krb5_kvno kvno; - krb5_keyblock *key; + krb5_keyblock *key = NULL; char *principal = NULL; char *princ_s = NULL; char *password_s = NULL; char keytab_name[MAX_KEYTAB_NAME_LEN]; /* This MAX_NAME_LEN is a constant defined in krb5.h */ - fstring myname; + fstring my_fqdn; int i; - int retval = 0; char *ktprinc = NULL; - struct hostent *hp; + ZERO_STRUCT(kt_entry); initialize_krb5_error_table(); ret = krb5_init_context(&context); if (ret) { - DEBUG(1,("could not krb5_init_context: %s\n",error_message(ret))); + DEBUG(1,("ads_keytab_add_entry: could not krb5_init_context: %s\n",error_message(ret))); return -1; } #ifdef HAVE_WRFILE_KEYTAB /* MIT */ @@ -69,30 +85,31 @@ int ads_keytab_add_entry(const char *srvPrinc, ADS_STRUCT *ads) ret = krb5_kt_default_name(context, (char *) &keytab_name[0], MAX_KEYTAB_NAME_LEN - 2); #endif if (ret) { - DEBUG(1,("krb5_kt_default_name failed (%s)\n", error_message(ret))); + DEBUG(1,("ads_keytab_add_entry: krb5_kt_default_name failed (%s)\n", error_message(ret))); + goto out; } - DEBUG(1,("Using default system keytab: %s\n", (char *) &keytab_name)); + DEBUG(2,("ads_keytab_add_entry: Using default system keytab: %s\n", (char *) &keytab_name)); ret = krb5_kt_resolve(context, (char *) &keytab_name, &keytab); if (ret) { - DEBUG(1,("krb5_kt_resolve failed (%s)\n", error_message(ret))); - return ret; + DEBUG(1,("ads_keytab_add_entry: krb5_kt_resolve failed (%s)\n", error_message(ret))); + goto out; } ret = get_kerberos_allowed_etypes(context,&enctypes); if (ret) { - DEBUG(1,("get_kerberos_allowed_etypes failed (%s)\n",error_message(ret))); + DEBUG(1,("ads_keytab_add_entry: get_kerberos_allowed_etypes failed (%s)\n",error_message(ret))); goto out; } /* retrieve the password */ if (!secrets_init()) { - DEBUG(1,("secrets_init failed\n")); + DEBUG(1,("ads_keytab_add_entry: secrets_init failed\n")); ret = -1; goto out; } password_s = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL); if (!password_s) { - DEBUG(1,("failed to fetch machine password\n")); + DEBUG(1,("ads_keytab_add_entry: failed to fetch machine password\n")); ret = -1; goto out; } @@ -100,23 +117,19 @@ int ads_keytab_add_entry(const char *srvPrinc, ADS_STRUCT *ads) password.length = strlen(password_s); /* Construct our principal */ - fstrcpy(myname, global_myname()); - hp = gethostbyname(myname); - if ( hp->h_name && strlen(hp->h_name) > 0 ) { - fstrcpy(myname,hp->h_name); - } - strlower_m(myname); - asprintf(&princ_s, "%s/%s@%s", srvPrinc, myname, lp_realm()); + name_to_fqdn(my_fqdn, global_myname()); + strlower_m(my_fqdn); + asprintf(&princ_s, "%s/%s@%s", srvPrinc, my_fqdn, lp_realm()); ret = krb5_parse_name(context, princ_s, &princ); if (ret) { - DEBUG(1,("krb5_parse_name(%s) failed (%s)\n", princ_s, error_message(ret))); + DEBUG(1,("ads_keytab_add_entry: krb5_parse_name(%s) failed (%s)\n", princ_s, error_message(ret))); goto out; } kvno = (krb5_kvno) ads_get_kvno(ads, global_myname()); if (kvno == -1) { /* -1 indicates failure, everything else is OK */ - DEBUG(1,("ads_get_kvno failed to determine the system's kvno.\n")); + DEBUG(1,("ads_keytab_add_entry: ads_get_kvno failed to determine the system's kvno.\n")); ret = -1; goto out; } @@ -124,10 +137,14 @@ int ads_keytab_add_entry(const char *srvPrinc, ADS_STRUCT *ads) /* Seek and delete old keytab entries */ ret = krb5_kt_start_seq_get(context, keytab, &cursor); if (ret != KRB5_KT_END && ret != ENOENT ) { - DEBUG(1,("Will try to delete old keytab entries\n")); - while(!krb5_kt_next_entry(context, keytab, &entry, &cursor)) { + DEBUG(3,("ads_keytab_add_entry: Will try to delete old keytab entries\n")); + while(!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) { - krb5_unparse_name(context, entry.principal, &ktprinc); + ret = krb5_unparse_name(context, entry.principal, &ktprinc); + if (ret) { + DEBUG(1,("ads_keytab_add_entry: krb5_unparse_name failed (%s)\n", error_message(ret))); + goto out; + } /*--------------------------------------------------------------------------- * Save the entries with kvno - 1. This is what microsoft does @@ -138,12 +155,14 @@ int ads_keytab_add_entry(const char *srvPrinc, ADS_STRUCT *ads) * with the new kvno. */ + HERE + #ifdef HAVE_KRB5_KT_COMPARE - if (krb5_kt_compare(context, &entry, princ, 0, 0) == True && entry.vno != kvno - 1) { + if (krb5_kt_compare(context, &kt_entry, princ, 0, 0) == True && kt_entry.vno != kvno - 1) { #else - if (strcmp(ktprinc, princ_s) == 0 && entry.vno != kvno - 1) { + if (strcmp(ktprinc, princ_s) == 0 && kt_entry.vno != kvno - 1) { #endif - free(ktprinc); + SAFE_FREE(ktprinc); DEBUG(1,("Found old entry for principal: %s (kvno %d) - trying to remove it.\n", princ_s, entry.vno)); ret = krb5_kt_end_seq_get(context, keytab, &cursor); @@ -168,7 +187,7 @@ int ads_keytab_add_entry(const char *srvPrinc, ADS_STRUCT *ads) } continue; } else { - free(ktprinc); + SAFE_FREE(ktprinc); } ret = krb5_kt_free_entry(context, &entry); @@ -231,22 +250,33 @@ int ads_keytab_add_entry(const char *srvPrinc, ADS_STRUCT *ads) out: - krb5_kt_close(context, keytab); - krb5_free_principal(context, princ); + SAFE_FREE(principal); + SAFE_FREE(password_s); + SAFE_FREE(princ_s); + + { + krb5_keytab_entry zero_kt_entry; + ZERO_STRUCT(zero_kt_entry); + if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) { + krb5_kt_free_entry(context, &kt_entry); + } + } + if (princ) { + krb5_free_principal(context, princ); + } if (enctypes) { - free(enctypes); + free_kerberos_etypes(context, enctypes); } - if (principal) { - free(principal); + if (cursor && keytab) { + krb5_kt_end_seq_get(context, keytab, &cursor); } - if (password_s) { - free(password_s); + if (keytab) { + krb5_kt_close(context, keytab); } - if (princ_s) { - free(princ_s); + if (context) { + krb5_free_context(context); } - - return ret; + return (int)ret; } |