diplodocus.org Git - nmh/blob - uip/mhlogin.c

   1 /*
   2  * mhlogin.c -- login to external (OAuth) services
   3  *
   4  * This code is Copyright (c) 2014, by the authors of nmh.  See the
   5  * COPYRIGHT file in the root directory of the nmh distribution for
   6  * complete copyright information.
   7  */
   8
   9 #include <errno.h>
  10 #include <stdio.h>
  11 #include <string.h>
  12
  13 #include <h/mh.h>
  14 #include <h/utils.h>
  15 #include <h/oauth.h>
  16
  17 #define MHLOGIN_SWITCHES \
  18     X("user username", 0, USERSW) \
  19     X("saslmech", 0, SASLMECHSW) \
  20     X("authservice", 0, AUTHSERVICESW) \
  21     X("browser", 0, BROWSERSW) \
  22     X("snoop", 0, SNOOPSW) \
  23     X("help", 0, HELPSW) \
  24     X("version", 0, VERSIONSW) \
  25
  26 #define X(sw, minchars, id) id,
  27 DEFINE_SWITCH_ENUM(MHLOGIN);
  28 #undef X
  29
  30 #define X(sw, minchars, id) { sw, minchars, id },
  31 DEFINE_SWITCH_ARRAY(MHLOGIN, switches);
  32 #undef X
  33
  34 #ifdef OAUTH_SUPPORT
  35 /* XXX copied from install-mh.c */
  36 static char *
  37 geta (void)
  38 {
  39     static char line[BUFSIZ];
  40
  41     if (fgets(line, sizeof(line), stdin) == NULL)
  42         done (1);
  43     trim_suffix_c(line, '\n');
  44
  45     return line;
  46 }
  47
  48 static int
  49 do_login(const char *svc, const char *user, const char *browser, int snoop)
  50 {
  51     char *fn, *code;
  52     mh_oauth_ctx *ctx;
  53     mh_oauth_cred *cred;
  54     FILE *cred_file;
  55     int failed_to_lock = 0;
  56     const char *url;
  57
  58     if (svc == NULL) {
  59         adios(NULL, "missing -authservice switch");
  60     }
  61
  62     if (user == NULL) {
  63         adios(NULL, "missing -user switch");
  64     }
  65
  66     if (!mh_oauth_new(&ctx, svc)) {
  67         adios(NULL, mh_oauth_get_err_string(ctx));
  68     }
  69
  70     if (snoop) {
  71         mh_oauth_log_to(stderr, ctx);
  72     }
  73
  74     fn = mh_xstrdup(mh_oauth_cred_fn(svc));
  75
  76     if ((url = mh_oauth_get_authorize_url(ctx)) == NULL) {
  77       adios(NULL, mh_oauth_get_err_string(ctx));
  78     }
  79
  80     if (browser) {
  81         char *command = concat(browser, " '", url, "'", NULL);
  82         int status = OK;
  83
  84         printf("Follow the prompts in your browser to authorize nmh"
  85                " to access %s.\n",
  86                mh_oauth_svc_display_name(ctx));
  87         sleep(1);
  88
  89         status = system(command);
  90         free(command);
  91
  92         if (status != OK) {
  93             adios ((char *) browser, "SYSTEM");
  94         }
  95     } else {
  96         printf("Load the following URL in your browser and authorize nmh"
  97                " to access %s:\n\n%s\n\n",
  98                mh_oauth_svc_display_name(ctx), url);
  99     }
 100     printf("Enter the authorization code: ");
 101     fflush(stdout);
 102     code = geta();
 103
 104     while (!*code ||
 105            ((cred = mh_oauth_authorize(code, ctx)) == NULL
 106             && mh_oauth_get_err_code(ctx) == MH_OAUTH_BAD_GRANT)) {
 107       printf(!*code  ?  "Empty code; try again? "  :  "Code rejected; try again? ");
 108       fflush(stdout);
 109       code = geta();
 110     }
 111     if (cred == NULL) {
 112       advise(NULL, "error exchanging code for OAuth2 token");
 113       adios(NULL, mh_oauth_get_err_string(ctx));
 114     }
 115
 116     cred_file = lkfopendata(fn, "r+", &failed_to_lock);
 117     if (cred_file == NULL && errno == ENOENT) {
 118         cred_file = lkfopendata(fn, "w+", &failed_to_lock);
 119     }
 120     if (cred_file == NULL || failed_to_lock) {
 121       adios(fn, "oops");
 122     }
 123     if (!mh_oauth_cred_save(cred_file, cred, user)) {
 124       adios(NULL, mh_oauth_get_err_string(ctx));
 125     }
 126     if (lkfclosedata(cred_file, fn) != 0) {
 127       adios (fn, "oops");
 128     }
 129
 130     free(fn);
 131     mh_oauth_cred_free(cred);
 132     mh_oauth_free(ctx);
 133
 134     return 0;
 135 }
 136 #endif
 137
 138 int
 139 main(int argc, char **argv)
 140 {
 141     char *cp, **argp, **arguments;
 142     const char *user = NULL, *saslmech = NULL, *svc = NULL, *browser = NULL;
 143     int snoop = 0;
 144
 145     if (nmh_init(argv[0], 1)) { return 1; }
 146
 147     arguments = getarguments (invo_name, argc, argv, 1);
 148     argp = arguments;
 149
 150     while ((cp = *argp++)) {
 151         if (*cp == '-') {
 152             char help[BUFSIZ];
 153             switch (smatch (++cp, switches)) {
 154             case AMBIGSW:
 155                 ambigsw (cp, switches);
 156                 done (1);
 157             case UNKWNSW:
 158                 adios (NULL, "-%s unknown", cp);
 159
 160             case HELPSW:
 161                 snprintf(help, sizeof(help), "%s [switches]",
 162                          invo_name);
 163                 print_help (help, switches, 1);
 164                 done (0);
 165             case VERSIONSW:
 166                 print_version(invo_name);
 167                 done (0);
 168
 169             case USERSW:
 170                 if (!(user = *argp++) || *user == '-')
 171                     adios (NULL, "missing argument to %s", argp[-2]);
 172                 continue;
 173
 174             case SASLMECHSW:
 175                 if (!(saslmech = *argp++) || *saslmech == '-')
 176                     adios (NULL, "missing argument to %s", argp[-2]);
 177                 continue;
 178
 179             case AUTHSERVICESW:
 180                 if (!(svc = *argp++) || *svc == '-')
 181                     adios (NULL, "missing argument to %s", argp[-2]);
 182                 continue;
 183
 184             case BROWSERSW:
 185                 if (!(browser = *argp++) || *browser == '-')
 186                     adios (NULL, "missing argument to %s", argp[-2]);
 187                 continue;
 188
 189             case SNOOPSW:
 190                 snoop++;
 191                 continue;
 192             }
 193         }
 194         adios(NULL, "extraneous arguments");
 195     }
 196
 197     if (saslmech  &&  strcasecmp(saslmech, "xoauth2")) {
 198         /* xoauth is assumed */
 199         adios(NULL, "only -saslmech xoauth2 is supported");
 200     }
 201     free(arguments);
 202
 203 #ifdef OAUTH_SUPPORT
 204     return do_login(svc, user, browser, snoop);
 205 #else
 206     NMH_UNUSED(svc);
 207     NMH_UNUSED(browser);
 208     NMH_UNUSED(snoop);
 209     adios(NULL, "not built with OAuth support");
 210     return 1;
 211 #endif
 212 }