diff options
Diffstat (limited to 'nis')
| -rw-r--r-- | nis/nss_nis/nis-pwd.c | 207 |
1 files changed, 178 insertions, 29 deletions
diff --git a/nis/nss_nis/nis-pwd.c b/nis/nss_nis/nis-pwd.c index 296526d7e6..b70091508c 100644 --- a/nis/nss_nis/nis-pwd.c +++ b/nis/nss_nis/nis-pwd.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1996, 1997 Free Software Foundation, Inc. +/* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1996. @@ -82,8 +82,8 @@ internal_nis_getpwent_r (struct passwd *pwd, char *buffer, size_t buflen, int *errnop) { struct parser_data *data = (void *) buffer; - char *domain, *result, *outkey; - int len, keylen, parse_res; + char *domain; + int parse_res; if (yp_get_default_domain (&domain)) return NSS_STATUS_UNAVAIL; @@ -92,7 +92,9 @@ internal_nis_getpwent_r (struct passwd *pwd, char *buffer, size_t buflen, do { enum nss_status retval; - char *p; + char *result, *outkey, *result2, *p; + int len, keylen, len2; + size_t namelen; if (new_start) retval = yperr2nss (yp_first (domain, "passwd.byname", @@ -109,15 +111,63 @@ internal_nis_getpwent_r (struct passwd *pwd, char *buffer, size_t buflen, return retval; } - if ((size_t) (len + 1) > buflen) - { - free (result); - *errnop = ERANGE; - return NSS_STATUS_TRYAGAIN; - } + /* Check for adjunct style secret passwords. They can be + recognized by a password starting with "##". */ + p = strchr (result, ':'); + if (p != NULL /* This better should be true in all cases. */ + && p[1] == '#' && p[2] == '#' + && (namelen = p - result, + yp_match (domain, "passwd.adjunct.byname", result, namelen, + &result2, &len2)) == YPERR_SUCCESS) + { + /* We found a passwd.adjunct entry. Merge encrypted + password therein into original result. */ + char *encrypted = strchr (result2, ':'); + char *endp; + size_t restlen; + + if (encrypted != NULL + || (endp = strchr (++encrypted, ':')) == NULL + || (p = strchr (p + 1, ':')) == NULL) + { + /* Invalid format of the entry. This never should happen + unless the data from which the NIS table is generated is + wrong. We simply ignore it. */ + free (result2); + goto non_adjunct; + } + + restlen = len - (p - result); + if ((size_t) (namelen + (endp - encrypted) + restlen + 2) > buflen) + { + free (result2); + free (result); + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + + __mempcpy (__mempcpy (__mempcpy (__mempcpy (buffer, result, namelen), + ":", 1), + encrypted, endp - encrypted), + p, restlen + 1); + p = buffer; + + free (result2); + } + else + { + non_adjunct: + if ((size_t) (len + 1) > buflen) + { + free (result); + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + + p = strncpy (buffer, result, len); + buffer[len] = '\0'; + } - p = strncpy (buffer, result, len); - buffer[len] = '\0'; while (isspace (*p)) ++p; free (result); @@ -161,8 +211,9 @@ _nss_nis_getpwnam_r (const char *name, struct passwd *pwd, { struct parser_data *data = (void *) buffer; enum nss_status retval; - char *domain, *result, *p; - int len, parse_res; + char *domain, *result, *result2, *p; + int len, len2, parse_res; + size_t namelen; if (name == NULL) { @@ -173,8 +224,10 @@ _nss_nis_getpwnam_r (const char *name, struct passwd *pwd, if (yp_get_default_domain (&domain)) return NSS_STATUS_UNAVAIL; + namelen = strlen (name); + retval = yperr2nss (yp_match (domain, "passwd.byname", name, - strlen (name), &result, &len)); + namelen, &result, &len)); if (retval != NSS_STATUS_SUCCESS) { @@ -183,15 +236,62 @@ _nss_nis_getpwnam_r (const char *name, struct passwd *pwd, return retval; } - if ((size_t) (len + 1) > buflen) + /* Check for adjunct style secret passwords. They can be recognized + by a password starting with "##". */ + p = strchr (result, ':'); + if (p != NULL /* This better should be true in all cases. */ + && p[1] == '#' && p[2] == '#' + && yp_match (domain, "passwd.adjunct.byname", name, namelen, + &result2, &len2) == YPERR_SUCCESS) { - free (result); - *errnop = ERANGE; - return NSS_STATUS_TRYAGAIN; + /* We found a passwd.adjunct entry. Merge encrypted password + therein into original result. */ + char *encrypted = strchr (result2, ':'); + char *endp; + size_t restlen; + + if (encrypted != NULL + || (endp = strchr (++encrypted, ':')) == NULL + || (p = strchr (p + 1, ':')) == NULL) + { + /* Invalid format of the entry. This never should happen + unless the data from which the NIS table is generated is + wrong. We simply ignore it. */ + free (result2); + goto non_adjunct; + } + + restlen = len - (p - result); + if ((size_t) (namelen + (endp - encrypted) + restlen + 2) > buflen) + { + free (result2); + free (result); + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + + __mempcpy (__mempcpy (__mempcpy (__mempcpy (buffer, name, namelen), + ":", 1), + encrypted, endp - encrypted), + p, restlen + 1); + p = buffer; + + free (result2); + } + else + { + non_adjunct: + if ((size_t) (len + 1) > buflen) + { + free (result); + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + + p = strncpy (buffer, result, len); + buffer[len] = '\0'; } - p = strncpy (buffer, result, len); - buffer[len] = '\0'; while (isspace (*p)) ++p; free (result); @@ -214,9 +314,10 @@ _nss_nis_getpwuid_r (uid_t uid, struct passwd *pwd, { struct parser_data *data = (void *) buffer; enum nss_status retval; - char *domain, *result, *p; - int len, nlen, parse_res; + char *domain, *result, *p, *result2; + int len, nlen, parse_res, len2; char buf[32]; + size_t namelen; if (yp_get_default_domain (&domain)) return NSS_STATUS_UNAVAIL; @@ -233,15 +334,63 @@ _nss_nis_getpwuid_r (uid_t uid, struct passwd *pwd, return retval; } - if ((size_t) (len + 1) > buflen) + /* Check for adjunct style secret passwords. They can be recognized + by a password starting with "##". */ + p = strchr (result, ':'); + if (p != NULL /* This better should be true in all cases. */ + && p[1] == '#' && p[2] == '#' + && (namelen = p - result, + yp_match (domain, "passwd.adjunct.byname", result, namelen, + &result2, &len2)) == YPERR_SUCCESS) { - free (result); - *errnop = ERANGE; - return NSS_STATUS_TRYAGAIN; + /* We found a passwd.adjunct entry. Merge encrypted password + therein into original result. */ + char *encrypted = strchr (result2, ':'); + char *endp; + size_t restlen; + + if (encrypted != NULL + || (endp = strchr (++encrypted, ':')) == NULL + || (p = strchr (p + 1, ':')) == NULL) + { + /* Invalid format of the entry. This never should happen + unless the data from which the NIS table is generated is + wrong. We simply ignore it. */ + free (result2); + goto non_adjunct; + } + + restlen = len - (p - result); + if ((size_t) (namelen + (endp - encrypted) + restlen + 2) > buflen) + { + free (result2); + free (result); + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + + __mempcpy (__mempcpy (__mempcpy (__mempcpy (buffer, result, namelen), + ":", 1), + encrypted, endp - encrypted), + p, restlen + 1); + p = buffer; + + free (result2); + } + else + { + non_adjunct: + if ((size_t) (len + 1) > buflen) + { + free (result); + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + + p = strncpy (buffer, result, len); + buffer[len] = '\0'; } - p = strncpy (buffer, result, len); - buffer[len] = '\0'; while (isspace (*p)) ++p; free (result); |