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 "list.h"
  14 #include "user_list.h"
  15
  16 static struct list_head user_list;
  17
  18 /*
  19  * lookup user in user list file. Fills in a user struct containing
  20  * filename of the user's public key as well as the permissions of that user.
  21  * Returns 1 on success, 0 if user does not exist and < 0 on errors.
  22  */
  23 static void populate_user_list(char *user_list_file)
  24 {
  25         FILE *file_ptr = NULL;
  26         char *char_ptr;
  27         char line[MAXLINE];
  28         /* keyword, user, key, perms */
  29         char w[MAXLINE], n[MAXLINE], k[MAXLINE], p[MAXLINE], tmp[4][MAXLINE];
  30         int num, ret;
  31
  32         file_ptr = fopen(user_list_file, "r");
  33         ret = -E_USERLIST;
  34         if (!file_ptr)
  35                 goto out;
  36         for (;;) {
  37                 struct user *u;
  38                 ret = para_fgets(line, MAXLINE, file_ptr);
  39                 if (ret < 0)
  40                         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
  41                 if (ret <= 0)
  42                         break;
  43                 if (sscanf(line,"%200s %200s %200s %200s", w, n, k, p) < 3)
  44                         continue;
  45                 if (strcmp(w, "user"))
  46                         continue;
  47                 PARA_DEBUG_LOG("found entry for %s\n", n);
  48                 u = para_malloc(sizeof(struct user));
  49                 u->name = para_strdup(n);
  50                 ret = get_rsa_key(k, &u->rsa, LOAD_PUBLIC_KEY);
  51                 if (ret < 0)
  52                         break;
  53                 char_ptr = p;
  54                 num = sscanf(char_ptr, "%200[A-Z_],%200[A-Z_],%200[A-Z_],%200[A-Z_]",
  55                         tmp[0], tmp[1], tmp[2], tmp[3]);
  56                 PARA_DEBUG_LOG("found %i perm entries\n", num);
  57                 u->perms = 0;
  58                 while (num > 0) {
  59                         num--;
  60                         if (!strcmp(tmp[num], "VSS_READ"))
  61                                 u->perms |= VSS_READ;
  62                         else if (!strcmp(tmp[num], "VSS_WRITE"))
  63                                 u->perms |= VSS_WRITE;
  64                         else if (!strcmp(tmp[num], "AFS_READ"))
  65                                 u->perms |= AFS_READ;
  66                         else if (!strcmp(tmp[num], "AFS_WRITE"))
  67                                 u->perms |= AFS_WRITE;
  68                         else /* unknown permission */
  69                                 PARA_WARNING_LOG("ignoring unknown permission: %s\n",
  70                                         tmp[num]);
  71                 }
  72                 para_list_add(&u->node, &user_list);
  73         }
  74 out:
  75         if (file_ptr)
  76                 fclose(file_ptr);
  77         if (ret >= 0)
  78                 return;
  79         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
  80         exit(EXIT_FAILURE);
  81 }
  82
  83 /**
  84  * initialize the list of users allowed to connecto to para_server
  85  *
  86  * \param user_list_file the file containing access information
  87  *
  88  * If this function is called a second time, the contents of the
  89  * previous call are discarded.
  90  */
  91 void init_user_list(char *user_list_file)
  92 {
  93         struct user *u, *tmp;
  94         static int initialized;
  95
  96         if (initialized) {
  97                 list_for_each_entry_safe(u, tmp, &user_list, node) {
  98                         list_del(&u->node);
  99                         free(u->name);
 100                         rsa_free(u->rsa);
 101                         free(u);
 102                 }
 103         } else
 104                 INIT_LIST_HEAD(&user_list);
 105         initialized = 1;
 106         populate_user_list(user_list_file);
 107 }
 108
 109 /**
 110  * lookup user in user_list.
 111  *
 112  * \param name of the user
 113  *
 114  * \return a pointer to the corresponding user struct if the user was found,
 115  *  \p NULL otherwise.
 116  */
 117 struct user *lookup_user(const char *name)
 118 {
 119         struct user *u;
 120         list_for_each_entry(u, &user_list, node) {
 121                 if (strcmp(u->name, name))
 122                         continue;
 123                 return u;
 124         }
 125         return NULL;
 126 }