user_list.c

   1 /*
   2  * Copyright (C) 2006-2007 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 "para.h"
  10 #include "error.h"
  11 #include "fd.h"
  12 #include "string.h"
  13 #include "user_list.h"
  14
  15 static struct list_head user_list;
  16
  17 /*
  18  * lookup user in user list file. Fills in a user struct containing
  19  * filename of the user's public key as well as the permissions of that user.
  20  * Returns 1 on success, 0 if user does not exist and < 0 on errors.
  21  */
  22 static void populate_user_list(char *user_list_file)
  23 {
  24         FILE *file_ptr = NULL;
  25         char *char_ptr;
  26         char line[MAXLINE];
  27         /* keyword, user, key, perms */
  28         char w[MAXLINE], n[MAXLINE], k[MAXLINE], p[MAXLINE], tmp[4][MAXLINE];
  29         int num, ret;
  30
  31         file_ptr = fopen(user_list_file, "r");
  32         ret = -E_USERLIST;
  33         if (!file_ptr)
  34                 goto out;
  35         for (;;) {
  36                 struct user *u;
  37                 ret = para_fgets(line, MAXLINE, file_ptr);
  38                 if (ret < 0)
  39                         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
  40                 if (ret <= 0)
  41                         break;
  42                 if (sscanf(line,"%200s %200s %200s %200s", w, n, k, p) < 3)
  43                         continue;
  44                 if (strcmp(w, "user"))
  45                         continue;
  46                 PARA_DEBUG_LOG("found entry for %s\n", n);
  47                 u = para_malloc(sizeof(struct user));
  48                 u->name = para_strdup(n);
  49                 ret = get_rsa_key(k, &u->rsa, LOAD_PUBLIC_KEY);
  50                 if (ret < 0)
  51                         break;
  52                 char_ptr = p;
  53                 num = sscanf(char_ptr, "%200[A-Z_],%200[A-Z_],%200[A-Z_],%200[A-Z_]",
  54                         tmp[0], tmp[1], tmp[2], tmp[3]);
  55                 PARA_DEBUG_LOG("found %i perm entries\n", num);
  56                 u->perms = 0;
  57                 while (num > 0) {
  58                         num--;
  59                         if (!strcmp(tmp[num], "VSS_READ"))
  60                                 u->perms |= VSS_READ;
  61                         else if (!strcmp(tmp[num], "VSS_WRITE"))
  62                                 u->perms |= VSS_WRITE;
  63                         else if (!strcmp(tmp[num], "AFS_READ"))
  64                                 u->perms |= AFS_READ;
  65                         else if (!strcmp(tmp[num], "AFS_WRITE"))
  66                                 u->perms |= AFS_WRITE;
  67                         else /* unknown permission */
  68                                 PARA_WARNING_LOG("ignoring unknown permission: %s\n",
  69                                         tmp[num]);
  70                 }
  71                 para_list_add(&u->node, &user_list);
  72         }
  73 out:
  74         if (file_ptr)
  75                 fclose(file_ptr);
  76         if (ret >= 0)
  77                 return;
  78         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
  79         exit(EXIT_FAILURE);
  80 }
  81
  82 /**
  83  * initialize the list of users allowed to connecto to para_server
  84  *
  85  * \param user_list_file the file containing access information
  86  *
  87  * If this function is called a second time, the contents of the
  88  * previous call are discarded.
  89  */
  90 void init_user_list(char *user_list_file)
  91 {
  92         struct user *u, *tmp;
  93         static int initialized;
  94
  95         if (initialized) {
  96                 list_for_each_entry_safe(u, tmp, &user_list, node) {
  97                         list_del(&u->node);
  98                         free(u->name);
  99                         rsa_free(u->rsa);
 100                         free(u);
 101                 }
 102         } else
 103                 INIT_LIST_HEAD(&user_list);
 104         initialized = 1;
 105         populate_user_list(user_list_file);
 106 }
 107
 108 /**
 109  * lookup user in user_list.
 110  *
 111  * \param name of the user
 112  *
 113  * \return a pointer to the corresponding user struct if the user was found,
 114  *  \p NULL otherwise.
 115  */
 116 struct user *lookup_user(const char *name)
 117 {
 118         struct user *u;
 119         list_for_each_entry(u, &user_list, node) {
 120                 if (strcmp(u->name, name))
 121                         continue;
 122                 return u;
 123         }
 124         return NULL;
 125 }