user_list.c

   1 /*
   2  * Copyright (C) 2006-2008 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file user_list.c User handling for para_server. */
   8
   9 #include <sys/types.h>
  10 #include <dirent.h>
  11
  12 #include "para.h"
  13 #include "error.h"
  14 #include "fd.h"
  15 #include "string.h"
  16 #include "list.h"
  17 #include "user_list.h"
  18
  19 static struct list_head user_list;
  20
  21 /*
  22  * Fill the list of users known to para_server.
  23  *
  24  * Populates a linked list of all users in \a user_list_file.  Returns on
  25  * success, calls exit() on errors.
  26  */
  27 static void populate_user_list(char *user_list_file)
  28 {
  29         int ret = -E_USERLIST;
  30         FILE *file_ptr = fopen(user_list_file, "r");
  31
  32         if (!file_ptr)
  33                 goto err;
  34         for (;;) {
  35                 int num;
  36                 char line[255];
  37                 /* keyword, name, key, perms */
  38                 char w[255], n[255], k[255], p[255], tmp[4][255];
  39                 struct user *u;
  40                 RSA *rsa;
  41
  42                 ret = para_fgets(line, MAXLINE, file_ptr);
  43                 if (ret <= 0)
  44                         break;
  45                 if (sscanf(line,"%200s %200s %200s %200s", w, n, k, p) < 3)
  46                         continue;
  47                 if (strcmp(w, "user"))
  48                         continue;
  49                 PARA_DEBUG_LOG("found entry for user %s\n", n);
  50                 ret = get_rsa_key(k, &rsa, LOAD_PUBLIC_KEY);
  51                 if (ret < 0) {
  52                         PARA_NOTICE_LOG("skipping entry for user %s: %s\n", n,
  53                                 para_strerror(-ret));
  54                         continue;
  55                 }
  56                 u = para_malloc(sizeof(*u));
  57                 u->name = para_strdup(n);
  58                 u->rsa = rsa;
  59                 u->perms = 0;
  60                 num = sscanf(p, "%200[A-Z_],%200[A-Z_],%200[A-Z_],%200[A-Z_]",
  61                         tmp[0], tmp[1], tmp[2], tmp[3]);
  62                 PARA_DEBUG_LOG("found %i perm entries\n", num);
  63                 while (num > 0) {
  64                         num--;
  65                         if (!strcmp(tmp[num], "VSS_READ"))
  66                                 u->perms |= VSS_READ;
  67                         else if (!strcmp(tmp[num], "VSS_WRITE"))
  68                                 u->perms |= VSS_WRITE;
  69                         else if (!strcmp(tmp[num], "AFS_READ"))
  70                                 u->perms |= AFS_READ;
  71                         else if (!strcmp(tmp[num], "AFS_WRITE"))
  72                                 u->perms |= AFS_WRITE;
  73                         else /* unknown permission */
  74                                 PARA_WARNING_LOG("ignoring unknown permission: %s\n",
  75                                         tmp[num]);
  76                 }
  77                 para_list_add(&u->node, &user_list);
  78         }
  79         fclose(file_ptr);
  80         if (ret >= 0)
  81                 return;
  82 err:
  83         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
  84         exit(EXIT_FAILURE);
  85 }
  86
  87 /**
  88  * Initialize the list of users allowed to connect to to para_server.
  89  *
  90  * \param user_list_file The file containing access information.
  91  *
  92  * If this function is called for the second time, the contents of the
  93  * previous call are discarded, i.e. the user list is reloaded.
  94  */
  95 void init_user_list(char *user_list_file)
  96 {
  97         struct user *u, *tmp;
  98         static int initialized;
  99
 100         if (initialized) {
 101                 list_for_each_entry_safe(u, tmp, &user_list, node) {
 102                         list_del(&u->node);
 103                         free(u->name);
 104                         rsa_free(u->rsa);
 105                         free(u);
 106                 }
 107         } else
 108                 INIT_LIST_HEAD(&user_list);
 109         initialized = 1;
 110         populate_user_list(user_list_file);
 111 }
 112
 113 /**
 114  * Lookup a user in the user list.
 115  *
 116  * \param name The name of the user.
 117  *
 118  * \return A pointer to the corresponding user struct if the user was found, \p
 119  * NULL otherwise.
 120  */
 121 struct user *lookup_user(const char *name)
 122 {
 123         struct user *u;
 124         list_for_each_entry(u, &user_list, node) {
 125                 if (strcmp(u->name, name))
 126                         continue;
 127                 return u;
 128         }
 129         return NULL;
 130 }