diff options
Diffstat (limited to 'generate_sbat_var_defs.c')
| -rw-r--r-- | generate_sbat_var_defs.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/generate_sbat_var_defs.c b/generate_sbat_var_defs.c new file mode 100644 index 00000000..1258e1b2 --- /dev/null +++ b/generate_sbat_var_defs.c @@ -0,0 +1,173 @@ +// SPDX-License-Identifier: BSD-2-Clause-Patent + +/* + * This generates the header files that produce the actual revocation + * string payload. On the one hand this grabs the defintions from the + * human readable SbatLevel_Variable.txt file which is nice. On the other + * hand it's one off c code. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +typedef struct sbat_revocation sbat_revocation; + +struct sbat_revocation { + int date; + char *revocations; + sbat_revocation *next; +}; + +static sbat_revocation *revlisthead; + +int +readfile(char *SbatLevel_Variable) +{ + FILE *varfilep; + char line[1024]; + int date; + int ret = -1; + + unsigned int revocationsp = 0; + + sbat_revocation *revlistlast = NULL; + sbat_revocation *revlistentry = NULL; + + revlisthead = NULL; + + varfilep = fopen(SbatLevel_Variable, "r"); + if (varfilep == NULL) + return -1; + + while (fgets(line, sizeof(line), varfilep) != NULL) { + if (sscanf(line, "sbat,1,%d\n", &date) && strlen(line) == 18) { + revlistentry = calloc(1, sizeof(sbat_revocation)); + if (revlistentry == NULL) + goto err; + if (revlisthead == NULL) + revlisthead = revlistentry; + else + revlistlast->next = revlistentry; + + revlistlast = revlistentry; + + revlistentry->date = date; + while (line[0] != '\n' && + fgets(line, sizeof(line), varfilep) != NULL) { + char *new = NULL; + new = realloc(revlistentry->revocations, + revocationsp + strlen(line) + 1); + if (new == NULL) { + ret = -1; + goto err; + } + revlistentry->revocations = new; + if (strlen(line) > 1) { + line[strlen(line) - 1] = 0; + sprintf(revlistentry->revocations + + revocationsp, + "%s\\n", line); + revocationsp = + revocationsp + strlen(line) + 2; + } + } + revocationsp = 0; + } + } + + ret = 1; +err: + if (ret < 0 && revlisthead) { + sbat_revocation *rle = revlisthead; + while (rle) { + sbat_revocation *next = rle->next; + if (rle->revocations) + free(rle->revocations); + free(rle); + rle = next; + } + revlisthead = NULL; + } + fclose(varfilep); + return ret; +} + +int +writefile() +{ + int epochfound = 0; + int epochdate = 2021030218; + int latestdate = 0; + + sbat_revocation *revlistentry; + sbat_revocation *latest_revlistentry = NULL; + + revlistentry = revlisthead; + + while (revlistentry != NULL) { + if (revlistentry->date == epochdate) { + printf("#ifndef GEN_SBAT_VAR_DEFS_H_\n" + "#define GEN_SBAT_VAR_DEFS_H_\n" + "#ifndef ENABLE_SHIM_DEVEL\n\n" + "#ifndef SBAT_AUTOMATIC_DATE\n" + "#define SBAT_AUTOMATIC_DATE 2024040900\n" + "#endif /* SBAT_AUTOMATIC_DATE */\n" + "#if SBAT_AUTOMATIC_DATE == %d\n" + "#define SBAT_VAR_AUTOMATIC_REVOCATIONS\n", + revlistentry->date); + epochfound = 1; + } else if (epochfound == 1) { + printf("#elif SBAT_AUTOMATIC_DATE == %d\n" + "#define SBAT_VAR_AUTOMATIC_REVOCATIONS \"%s\"\n", + revlistentry->date, + revlistentry->revocations); + } + if (revlistentry->date > latestdate) { + latest_revlistentry = revlistentry; + latestdate = revlistentry->date; + } + revlistentry = revlistentry->next; + } + + if (epochfound == 0 || !latest_revlistentry) + return -1; + + printf("#else\n" + "#error \"Unknown SBAT_AUTOMATIC_DATE\"\n" + "#endif /* SBAT_AUTOMATIC_DATE == */\n\n" + "#define SBAT_VAR_AUTOMATIC_DATE QUOTEVAL(SBAT_AUTOMATIC_DATE)\n" + "#define SBAT_VAR_AUTOMATIC \\\n" + " SBAT_VAR_SIG SBAT_VAR_VERSION SBAT_VAR_AUTOMATIC_DATE \"\\n\" \\\n" + " SBAT_VAR_AUTOMATIC_REVOCATIONS\n\n"); + + printf("#define SBAT_VAR_LATEST_DATE \"%d\"\n" + "#define SBAT_VAR_LATEST_REVOCATIONS \"%s\"\n", + latest_revlistentry->date, + latest_revlistentry->revocations); + + printf("#define SBAT_VAR_LATEST \\\n" + " SBAT_VAR_SIG SBAT_VAR_VERSION SBAT_VAR_LATEST_DATE \"\\n\" \\\n" + " SBAT_VAR_LATEST_REVOCATIONS\n\n" + "#endif /* !ENABLE_SHIM_DEVEL */\n" + "#endif /* !GEN_SBAT_VAR_DEFS_H_ */\n"); + + return 0; +} + + +int +main(int argc, char *argv[]) +{ + char SbatLevel_Variable[2048]; + + if (argc == 2) + snprintf(SbatLevel_Variable, 2048, "%s/SbatLevel_Variable.txt", argv[1]); + else + snprintf(SbatLevel_Variable, 2048, "SbatLevel_Variable.txt"); + + if (readfile(SbatLevel_Variable)) + return writefile(); + else + return -1; +} |